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  • Widespread misinterpretation of DNS rules in resolving wildcards

    - by Dominic Sayers
    [EDITED to add: This problem has gone away on its own. I believe Cloudflare's name resolution may have been to blame. See my own answer below] Here is a snippet of my zone file *.example.com. 300 IN CNAME proxy.herokuapp.com. foo.example.com. 300 IN A 111.111.111.111 If I dig @8.8.8.8 foo.example.com I get the answer I expect: ;; ANSWER SECTION: foo.example.com. 30 IN A 111.111.111.111 The same is true of all other public DNS servers I've tried. However, when I try to set up a check with Pingdom to a URL on foo.example.com it instead sends the traffic to my Heroku app referenced by the *.example.com RR. The same is true of checks set up on New Relic, Errplane and traffic generated by the Heroku app itself. So on the one side, all public DNS servers interpret the zone file one way. Yet four service providers all interpret it a different way, one that differs to the standard suggested by RFC 4592. My question is: are these reputable, mature service providers all wrong? Or is it little me?

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  • Concerns about Apache per-Vhost logging setup

    - by etienne
    I'm both senior developer and sysadmin in my company, so i'm trying to deal with the needs of both activities. I've set up our apache box, wich deals with 30-50 domains atm (and hopefully will grow larger) and hosts both production and development sites, with this directory structure: domains/ domains/domain.ext/ #FTPS chroot for user domain.ext domains/domain.ext/public #the DocumentRoot of http://domain.ext domains/domain.ext/logs domains/domain.ext/subdomains/sub.domain.ext domains/domain.ext/subdomains/sub.domain.ext/public #DocumentRoot of http://sub.domain.ext Each domain.ext Vhost runs with his dedicated user and group via mpm-itk, umask being 027, and the logs are stored via a piped sudo command, like this: ErrorLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_error.log" CustomLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_access.log" combined Now, i've read a lot about not letting the logs out of a very restricted directory, but the developers often need to give a quick look to a particular subdomain error log, and i don't really want to give them admin rights to look into /var/logs. Having them available into the ftp account is REALLY handy during development stages. Do you think this setup is viable and safe enough? To me it is apparently looking good, but i'm concerned about 3 security issues: -is the sudo pipe enough to deal with symlink exploits? Any catches i'm missing? -log dos: logs are in the same partition of all domains. got hundreds of gigs, but still, if one get disk-space dos'd, everything will break. Any workaround? Will a short timed logrotate suffice? -file descriptors limits: AFAIK the default limit for Apache on Ubuntu Server is currently 8192, which should be plenty enough to handle 2 log files per subdomain. Is it? Am i missing something? I hope to read some thoughts on the matter!

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  • Dissing Architects, or "What's wrong with the coffee?"

    - by Bob Rhubart
    In my conversations with people in architect roles, tales of animosity, disrespect, and outright hostility aren't uncommon. And it's clear that in more than a few organizations architects regularly face a tough uphill climb. For architects with the requisite combination of technical, organizational, and people skills, that rough treatment is grossly undeserved. But tales of unqualified people in positions up and down the IT food chain are also easy to come by. So what's the other side of the architect story? Are some architects tarnishing the role and making life miserable for their more qualified colleagues? The various quotes included below were culled from a variety of sources. The criticism is harsh, and the people behind these quotes clearly have issues with architects. Still, whether based on mere opinion or actual experience, the comments shed some light on behaviors that should raise red flags for anyone pursuing a career as an architect. If you're an architect, and you've ever noticed that your coffee tastes like window cleaner, or your car is repeatedly keyed, or no one ever holds the elevator for you, maybe you need to do a little soul searching... Those Who Can, Code; Those Who Can't, Architect | Joe Winchester [May 18, 2007] "At the moment there seems to be an extremely unhealthy obsession in software with the concept of architecture. A colleague of mine, a recent graduate, told me he wished to become a software architect. He was drawn to the glamour of being able to come up with grandiose ideas - sweeping generalized designs, creating presentations to audiences of acronym addicts, writing esoteric academic papers, speaking at conferences attended by headless engineers on company expense accounts hungrily seeking out this year's grail, and creating e-mails with huge cc lists from people whose signature footer is more interesting than the content. I tried to re-orient him into actually doing some coding, to join a team that has a good product and keen users both of whom are pushing requirements forward, to no avail. Somehow the lure of being an architecture astronaut was too strong and I lost him to the dark side." Don't Let Architecture Astronauts Scare You | Joel Spolsky [April 21, 2001] "It's very hard to get them to write code or design programs, because they won't stop thinking about Architecture. They're astronauts because they are above the oxygen level, I don't know how they're breathing. They tend to work for really big companies that can afford to have lots of unproductive people with really advanced degrees that don't contribute to the bottom line. Remember that the architecture people are solving problems that they think they can solve, not problems which are useful to solve." Non Coding Architects Suck | Richard Henderson [May 24, 2010] "If a guy with a badge saying 'system architect' looks blank on low-level issues then he is not an architect, he is a business-analyst who went on a course. He will probably wax lyrical on all things high-level and 'important.' He will produce lovely object hierarchies without a clue to implementation. He will have a moustache and play golf." Architects Play Golf | Sunir Shah [August 15, 2012] "Often arrogant architects are difficult to get a hold of during the implementation phase because they no longer feel the need to stick around. Especially around midnight when most of the poor sob [sic] developers are still banging away. After all, they've already solved the problem--the rest is just an implementation exercise." Engineer vs Architect(Part of a discussion on the IT Architect Network Group on LinkedIn) "[An] architect spends his time producing white papers full of acronyms he does not understand but that impress his boss [while the] engineer keeps his head down and does the actual job." Architects Don't Code | [Author Unknown] "Faulty belief: System Architects don't need to code anymore. They know what they are talking about by virtue of the fact that they are System Architects."

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  • Windows 8 Camp&ndash;Ways to Prepare

    - by Lori Lalonde
    When Windows 8 was announced at the BUILD conference back in September, it created quite a buzz among the developer community. By the spring of 2012,  Windows 8 Developer Camps started popping up everywhere imaginable. I received a lot of questions from CTTDNUG members about whether or not we would be hosting one locally. If you recall my post about the Windows Phone/Azure Developer Workshop that CTTDNUG hosted back in March, you’ll remember that the biggest hurdle to overcome when planning this type of event was finding the right venue. It took some time, but I finally found a venue that was available and provided the prerequisites needed to ensure this camp is a success. I am very excited that CTTDNUG will be hosting a Windows 8 Camp this summer in the Kitchener/Waterloo area. In fact, it’s coming up in less than 2 weeks. Clearly other developers are excited as well, because our registration numbers show that the event is already 70% full! On top of that, I was fortunate enough to also book two well-known evangelists to present and teach at this full day developer camp: Andrei Marukovich and Atley Hunter. This was the icing on the cake. With the content provided by Microsoft, and two local experts that live and breathe Windows 8 development, I know that I, along with other developers that attend this event, will have the opportunity to maximize our learning potential and hit the ground running. If you plan on attending a Windows 8 Developer Camp soon, and want to ensure you get the most “bang for your buck” (figuratively speaking, since these camps are free), there are some things you can do to prepare before the big day: 1) Install the prerequisites on your own device before the big day I can’t stress this enough. Otherwise, you will be spending valuable time during the hands-on period downloading and installing what is needed, rather than digging into the development and using that time to ask the experts on-hand about programming challenges, issues, questions you may have with respect to your development. Prerequisites: Windows 8 Release Preview Visual Studio 2012 RC Download the Windows 8 SDK Samples 2) Purchase, download, and read Charles Petzold’s newest book:  Programming Windows 6th Edition This is a great introduction to the type of content you will be learning about during the camp. Doing some light reading beforehand might raise some questions about the concepts discussed in the book, which will give you the opportunity to write them down and bring them with you to the camp. The experts on hand will be able to answer them for you. 3) Make use of the freebies that are available Telerik has recently released a preview of their RadControls for Metro. You can sign up to receive a license code to give you access to install the preview for free and start playing around with it. Syncfusion also offers a free download of their Metro Studio package, which is a collection of metro style icons that you can customize and use in your own applications. Last but not least, once you’ve installed the Windows 8 Release Preview on your own device, go to the Windows 8 Store and download a handful of the free apps that are available. Testing out other Metro apps may give you ideas of what you can do in your own apps and analyze what features you like: application flow, type of animations used, concepts that were leveraged, how live tiles were used, etc. I hope you found these tips to be useful as you embark on a new development journey! Although this post focused on how to prepare for a Windows 8 camp, the same ideas are there whichever developer camp/workshop/event you attend. Learning does not begin and end on the day of the event. Attending a developer camp is just one step of many to master whatever technology you are interested in. It is a continuous process, which is fully maximized when you do your homework beforehand, actively participate during,  and follow up by putting what you learned to practice afterwards. Happy coding!

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  • Docs for OpenSSH CA-based certificate based authentication

    - by Zoredache
    OpenSSH 5.4 added a new method for certificate authentication (changes). * Add support for certificate authentication of users and hosts using a new, minimal OpenSSH certificate format (not X.509). Certificates contain a public key, identity information and some validity constraints and are signed with a standard SSH public key using ssh-keygen(1). CA keys may be marked as trusted in authorized_keys or via a TrustedUserCAKeys option in sshd_config(5) (for user authentication), or in known_hosts (for host authentication). Documentation for certificate support may be found in ssh-keygen(1), sshd(8) and ssh(1) and a description of the protocol extensions in PROTOCOL.certkeys. Is there any guides or documentation beyond what is mentioned in the ssh-keygen man-page? The man page covers how to generate certificate and use them, but it doesn't really seem to provide much information about the certificate authority setup. For example, can I sign the keys with an intermediate CA, and have the server trust the parent CA? This comment about the new feature seems to mean that I could setup my servers to trust the CA, then setup a method to sign keys, and then users would not have to publish their individual keys on the server. This also seems to support key expiration, which is great since getting rid of old/invalid keys is more difficult then it should be. But I am hoping to find some more documentation about describe the total configuration CA, SSH server, and SSH client settings needed to make this work.

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  • Xsigo and Oracle's Storage

    - by Philippe Deverchère
    Xsigo, a virtual network infrastructure provider, has recently been acquired by Oracle. Following this acquisition, one might ask ourselves why it is important to Oracle and how Oracle's storage is going to benefit on the long term from this virtualized infrastructure layer. Well, the first thing to understand is that Virtual Networking addresses both network and storage connectivity. Oracle Virtual Networking, as the Xsigo technology is now called, connects any server to any network and storage, so this is not just about connecting servers to the Internet or Intranet. It is also for a large part connecting servers to NAS and SAN storage. Connecting servers to storage has become increasingly complex in the past few years because of the strong emergence of virtualization at the Operating System level. 50% of enterprise workloads are now virtualized, up from 18% in 2009, resulting in a strong consolidation of various applications in a high density server footprint. At the same time, server I/O capability increased 8x in the last 8 years. All this has pushed IT administrators to multiply the number of I/O connections in the back-end of their physical servers, resulting in a messy and very hard to manage networking infrastructure. Here is a typical view of a rack back-end when no virtual networking is used. We consider that today: - 75% of users have ten or more Ethernet ports per server - 85% of users have two or more SAN ports per server - 58% have had to add connectivity to a server specifically for VMs - 65% consider cable reduction a priority The average is 12 or more ports per server, resulting in an extremely complex infrastructure to manage. What Oracle wants to achieve with its Oracle Virtual Networking offering is pretty simple. The objective is to eliminate the complexity through a dramatic reduction of cabling between servers and storage/networks. It is also to provide a software based management system so that any server can be connected to any network or any storage, on demand, and without physical intervention on the infrastructure. At the end of the day, the picture on the left shows what one wants to get for the back-end of customer's racks: just a couple of connections on each physical server to provide a simple, agile and fast network infrastructure for both storage and networking access. This is exactly what the Oracle Virtual Networking solution does. It transforms a complex, error-prone, difficult to manage and expensive networking infrastructure into a simple, high performance and agile solution for the data center. Practically speaking, and for the sake of simplicity, imagine that each server just hosts a minimal number of physical InfiniBand HCAs (Host Channel Adapter) with two links (for redundancy) onto the Oracle Fabric Interconnect director. Using the Oracle Fabric Manager software, you'll then be able to create virtual NICs and HBAs (called vNIC and vHBA) that will be seen by the servers as standard NICs and HBAs and associate them to networks and storage systems which are physically connected to the back-end of the director through standard Fibre Channel and Ethernet GbE/10GbE ports. In addition to this incredibly simple "at-a-click" connectivity capability, the Oracle Virtual Networking solution offers powerful features such as network isolation, Quality of Service, advanced performance monitoring and non-disruptive reconfiguration, migration and scalability of networking infrastructure. So let's go back now to our initial question: why is Oracle Virtual Networking especially important to Oracle's storage solutions? After all, one could connect any storage in the back-end of the Oracle Fabric Interconnect directors, right? The answer is pretty simple: since Oracle owns both the virtualized networking infrastructure and the storage (ZFS-SA, Pillar Axiom and tape), it is possible to imagine several ways in the future to add value when it comes to connect storage to a virtualized storage network: enhanced storage capabilities, converged management between storage and network, improved diagnostic capabilities and optimized integration resulting in higher performance and unique features/functions. Of course, all this is not going to be done overnight, and future will tell us is which evolutions come first. But there is little doubt that the integration of Xsigo within Oracle is going to create opportunities for Oracle's storage!

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  • How to read an Excel file, get and set the information using POI

    - by user1399713
    I'm using Java to read a form that is in an Excel spreadsheet that the user fills in with information about geometric shape. Ex: Shape :_________ Color :_________ Area: _________ Perimeter:________ So far the code I have can I can read what I want in the form and print out the values of Shape, Color, Area, Perimeter. public class RangeSetter { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { FileInputStream file = new FileInputStream(new File("test2.xls")); //C:\Users\Yo\Documents // Setup code String cname = "Shape"; HSSFWorkbook wb = new HSSFWorkbook(file); // retrieve workbook // Retrieve the named range // Will be something like "$C$10,$D$12:$D$14"; int namedCellIdx = wb.getNameIndex(cname); Name aNamedCell = wb.getNameAt(namedCellIdx); // Retrieve the cell at the named range and test its contents // Will get back one AreaReference for C10, and // another for D12 to D14 AreaReference[] arefs = AreaReference.generateContiguous(aNamedCell.getRefersToFormula()); for (int i=0; i<arefs.length; i++) { // Only get the corners of the Area // (use arefs[i].getAllReferencedCells() to get all cells) CellReference[] crefs = arefs[i].getAllReferencedCells(); for (int j=0; j<crefs.length; j++) { // Check it turns into real stuff Sheet s = wb.getSheet(crefs[j].getSheetName()); Row r = s.getRow(crefs[j].getRow()); Cell c = r.getCell(crefs[j].getCol()); if (c!= null ){ switch(c.getCellType()){ case Cell.CELL_TYPE_STRING: System.out.println(c.getStringCellValue()); } } } } What I want to do is to create a method that gets the that information and another that sets it. So far I can only print to the console

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  • Conference networking for the socially awkward

    - by Melanie Townsend
    Do you approach a room full of strangers with excitement at all the new people you’re going to chat to over coffee and a muffin as you swap tales of how you convinced your manager to give you the day “off”? Or, do you find rooms full of strangers intimidating and begin by scouting out a place you can stand quietly and not be in someone’s way until the next session begins? If you’re on the train to extrovert city, that’s great, well done, move along. If, on the other hand, a room full of strangers who all seem to inexplicably know each other already is more challenge than opportunity, then making those connections with other professionals can be more difficult. So, here’s some advice, some gleaned from other things I’ve read online when trying to overcome my own discomfort in large groups (hopefully minus the infuriating condescension), others are just things I’ve found helpful over the years. Start small Smaller groups are less intimidating, and, now that you’ve taken the plunge to show up, it’s harder to remain inconspicuous. I find it’s easier to speak to new people once the option NOT to has been taken away. You’re there now, smile through the awkward and you’ll be forever grateful when the three people you’ve met and gotten to know here are also at that gigantic conference later on (ideally, introducing you to other people). Smile, or at the very least, stop scowling You probably don’t even know you’re doing it. If your resting face doesn’t come across as manically happy, tinge that with some social anxiety and you become one great ball of unapproachable. Normally, I wouldn’t suggest this as a problem that needs fixing, I have personally honed this face to use while travelling alone all the time. However, if you are indeed hoping to meet some useful people and get the most out of this conference, you may need to remind yourself to smile. Prepare some ice breakers This is going to sound stupid, like “no one does this right?” stupid, but, just, trust me a minute. It’s okay to prepare. You don’t need to write word-for-word questions to ask people and practice them in a mirror – that would be strange. I’m suggesting to just have an arsenal of questions to ask people if you get stuck, what session has been your favorite, which ones are you most looking forward to, have you heard X presenter speak before, what did you think of them? Even just thinking about these things in advance can help, and, as a bonus, while the other person is answering it gives you a moment to tamp down that panic, I mean breathe, I mean get to know them. You’re not alone (in the least creepy way possible) See that person in the corner clutching their phone with a mild deer in the headlights look?  That is potentially your new conference buddy. Starting with something along the lines of: I don’t know about you, the sessions here are great but I find the crowds a little tough to deal with. Mind if I park here for a second? is a decent opener. Just walking around and looking at exhibitors (if applicable) is fine, but it’s a little too easy to wander about and not actually speak to anyone if that’s all you’re doing. If joining a group of people talking is too much to start with, one-on-one can be easier. Have goals Are there people in particular you wanted to speak to? Did you have a personal goal of speaking to at least “x” new people? Are you trying to get a contact in a specific company because you want to work with them on something? Does the business have vague goals as well that you may or may not be judged on later? Making specific goals you can accomplish lets you know whether you’ve actually succeeded in your “networking pursuits” or what you need to work on more for next time. Everyone’s got their own coping technique. Some people are able to remind themselves that “humans are fundamentally social creatures” and somehow that helps them, others drink which is not really something I recommend for professional conferences but to each their own, and some focus on the fact that networking can play a big role in their career path. Just do what works for you, and if there’re any tricks you’ve found helpful over the years, please share em.

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  • Router recommendation to virtualize 800 IPs

    - by delerious010
    I've recently been looking at getting some new load balancers for our environment as we are expecting to double our client base in the next 12 months. Currently we have 400 public IPS serving 800 clusters ( 2 clusters / IP due to ports ) on Coyote Point Balancers, and distributing connections to 3 web servers serving about 6GBytes outgoing, 2Gbytes in per day. If we double, this would be about 800 IPs, possibly 1600 clusters, and about 6 servers per cluster ( for a total of 9600 so called "real servers" using Barracuda's lingo ). Due to the amount of clusters, most solutions I've looked at ( Coyote, Barracuda, Loadbalancer.org ) seem to be unsure whether they'll be able to handle our planned growth, mostly due to health checks performed on the servers ... which makes total sense when you think of it. So the fine folk at loadbalancer.org recommended that we may be better off offload the 400-800 public IPs, which we require for SSL eCommerce solutions, over to a forward facing router. From that point on, the router could do some mangling to route EXT_IP:443 to INT_IP:INT_PORT which would then allow us to reduce the Load Balancer configuration to 1 or 2 clusters, thus resolving the health check problem. Does this idea make sense to yall ? Or would you have other recommendations to make ? Secondly, what router would you recommend for such an undertaking ? I'd be looking at something that has some form of failover mechanism built in. On a totally unrelated note, I've got to admit that I'm extremely pleased with the responses I got from loadbalancer.org. Their responses to my inquiries were surprisingly helpful ( i.e. I didn't feel as if I was taking to a sales guy trying to push something ). ( No I don't work for them, and sadly nor are they sending me free gear ).

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  • probems using ssh from cron

    - by Travis
    I am attempting to automate a script that executes commands on remote machines via ssh. I have public key authentication setup between the machines using ssh-agent. The script runs fine when executed from the command prompt. I suspect my problem is that cron isn't starting the ssh-agent due to it's minimalist environment. Here is the output when I add the -v flag to ssh: debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering public key: /home/<user>/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 149 debug1: PEM_read_PrivateKey failed debug1: read PEM private key done: type <unknown> debug1: Trying private key: /home/<user>/.ssh/id_dsa debug1: Next authentication method: password debug1: Authentications that can continue: publickey,gssapi-with-mic,password Permission denied, please try again. debug1: Authentications that can continue: publickey,gssapi-with-mic,password Permission denied, please try again. debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: No more authentication methods to try. Permission denied (publickey,gssapi-with-mic,password). How can I make this work? Thanks!

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  • Changing default openVPN IP in linux server

    - by Lamboo
    The problem is that we have a public OpenVPN service. Pay €9.95 and you get an OpenVPN account at currently half a dozen of servers for a month. This means there are always and will always be some people who create a certain amount of abuse or trouble. On the long run, the external IP every OpenVPN user gets assigned is prohibited from editing Wikipedia, it might be banned by e-gold and on some popular webforums, one-click-hosters, etc. Not a pleasant experience for the 97% of our customers who use our service responsibly and legitimately to regain their privacy. So even if I could change the assigned external IP every few months; e. g. from 216.xx.xx.164 to 216.xx.xx.170, it would help us a lot to combat this abuse and to provide our paying clients with "fresh" IP addresses that aren't banned or restricted on some popular Internet sites and services, yet. Does anybody know how to change the first IP address assigned to the public interface in CentOS? So that e.g. OpenVPN in future doesn't give our OpenVPN clients the external IP 123.xx.xx.164 but rather 123.xx.xx.170?

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  • In spite of correct DNS, Exchange sending to wrong destination server for single outbound domain

    - by beporter
    My company uses an SBS 2003 server and makes use of Exchange to host our own email. We also have a linux server hosting domains for some of our clients. In order for us to send to those clients, we had internal DNS set up to shadow the client domains to provide "correct" MX records inside our network. For example, public DNS for a domain abc.com might point to 1.2.3.4, but internally we have MX records set up to route mail for abc.com to 172.16.0.4, which is the linux email server. This setup was entirely functional; this is just back story. We've recently moved one of our client domains from our internal linux server to an external email provider. When we did that, we naturally deleted our internal shadow DNS records so our Exchange server would fetch correct (public) DNS records and route mail out to the new external host. This has NOT had any effect on Exchange though. Even after rebooting the Exchange server and completely flushing the DNS cache (nslookups on the Exchange machine itself correctly resolve to the new external address) Exchange still attempts to deliver messages for the domain to our internal server! Exchange correctly routes to all other internal and external domains when sending email. Somehow Exchange is trying to deliver to a machine that by all accounts it has no business trying to use for just this one domain. Is there a DNS cache that Exchange uses internally? Is there a way to flush that internal cache? What else could I be missing?

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  • Talking JavaOne with Rock Star Kirk Pepperdine

    - by Janice J. Heiss
    Kirk Pepperdine is not only a JavaOne Rock Star but a Java Champion and a highly regarded expert in Java performance tuning who works as a consultant, educator, and author. He is the principal consultant at Kodewerk Ltd. He speaks frequently at conferences and co-authored the Ant Developer's Handbook. In the rapidly shifting world of information technology, Pepperdine, as much as anyone, keeps up with what's happening with Java performance tuning. Pepperdine will participate in the following sessions: CON5405 - Are Your Garbage Collection Logs Speaking to You? BOF6540 - Java Champions and JUG Leaders Meet Oracle Executives (with Jeff Genender, Mattias Karlsson, Henrik Stahl, Georges Saab) HOL6500 - Finding and Solving Java Deadlocks (with Heinz Kabutz, Ellen Kraffmiller Martijn Verburg, Jeff Genender, and Henri Tremblay) I asked him what technological changes need to be taken into account in performance tuning. “The volume of data we're dealing with just seems to be getting bigger and bigger all the time,” observed Pepperdine. “A couple of years ago you'd never think of needing a heap that was 64g, but today there are deployments where the heap has grown to 256g and tomorrow there are plans for heaps that are even larger. Dealing with all that data simply requires more horse power and some very specialized techniques. In some cases, teams are trying to push hardware to the breaking point. Under those conditions, you need to be very clever just to get things to work -- let alone to get them to be fast. We are very quickly moving from a world where everything happens in a transaction to one where if you were to even consider using a transaction, you've lost." When asked about the greatest misconceptions about performance tuning that he currently encounters, he said, “If you have a performance problem, you should start looking at code at the very least and for that extra step, whip out an execution profiler. I'm not going to say that I never use execution profilers or look at code. What I will say is that execution profilers are effective for a small subset of performance problems and code is literally the last thing you should look at.And what is the most exciting thing happening in the world of Java today? “Interesting question because so many people would say that nothing exciting is happening in Java. Some might be disappointed that a few features have slipped in terms of scheduling. But I'd disagree with the first group and I'm not so concerned about the slippage because I still see a lot of exciting things happening. First, lambda will finally be with us and with lambda will come better ways.” For JavaOne, he is proctoring for Heinz Kabutz's lab. “I'm actually looking forward to that more than I am to my own talk,” he remarked. “Heinz will be the third non-Sun/Oracle employee to present a lab and the first since Oracle began hosting JavaOne. He's got a great message. He's spent a ton of time making sure things are going to work, and we've got a great team of proctors to help out. After that, getting my talk done, the Java Champion's panel session and then kicking back and just meeting up and talking to some Java heads."Finally, what should Java developers know that they currently do not know? “’Write Once, Run Everywhere’ is a great slogan and Java has come closer to that dream than any other technology stack that I've used. That said, different hardware bits work differently and as hard as we try, the JVM can't hide all the differences. Plus, if we are to get good performance we need to work with our hardware and not against it. All this implies that Java developers need to know more about the hardware they are deploying to.” Originally published on blogs.oracle.com/javaone.

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  • Get Your Enterprise Working With Oracle On Track Communication 1.0

    - by Josh Lannin
    The On Track Development team is very pleased to announce that today On Track is available for our customers to download and evaluate.  To learn more about what On Track does start with our whitepaper and datasheet.   If you are a developer, take a look at our documentation and samples posted to our OTN page. For this first blog post, I’ll be speaking to several notable points about our product. Graceful Escalation via Conversations: On Track addresses the “Collaboration Problem” through a single guiding principle – graceful escalation – within the construct of a Conversation. In On Track, collaboration is based on a context (called a “Conversation”) that gracefully escalates in form, structure, and content, as dictated by the particular needs of a given collaboration.  Within that context, On Track provides a rich set of tools to choose from.  These tools provide for communication, coordination, content management, organization, decision making, and analysis -- all essential aspects of collaboration, but not all of them are essential all of the time.  Every collaborative interaction will evolve differently.  Some will evolve to represent work spreading over the course of years and involving a large, distributed team, while others may involve few people and not evolve at all.  Regardless, all collaborative contexts are built from the same parts, utilize the same concepts, and start the same way.  The principle of graceful escalation is that you only use the tools and structure you need; so you only incur the complexity you need. Purposeful Collaboration: Through application integration, On Track Conversations bring enterprise application users the communication and collaboration capabilities required to complete business process.  By association with specific processes or business objects conversations extend the possible interactions and broaden participation to internal or external non-application users and provide a sophisticated interaction experience, all the while enhancing the data set within the owning application.  Purposeful collaboration not only needs to happen in the context of applications, it must support a full range of real-time and long-running interactions to provide the greatest value. Multi Client, Multi Modal: This On Track 1.0 product release includes the same day availability of  multiple clients, including iPhone and iPad applications which are now available on the Apple Store, a fully capable and accessible Outlook Add-In, along with our browser web client.  With each client we have sought to leverage the strengths of each unique device- our iPhone client supports picture and voice posts, the iPad is optimized for meeting room situations and document viewing, and our Outlook add-in allows you to take emails in context and bring them into On Track.  In addition to supporting a diverse array of clients, On Track provides a unified multi modal experience support starting with basic messages moving through to integrated documents with live annotations, snapshots, application sharing, and voice. Next Generation Web Architecture: We believe On Track will help move the bar higher for what users can expect from all web applications, most notably ones that involve real-time activity.  On Track is built from the ground up with an innovative, real-time architecture that leverages the extensive push capabilities of our server.  Whether you are receiving a new message, viewing where crowds of people are collaborating, or doing live annotation on a document with a set of people, that information comes to you immediately without refreshes or moving back and forth between pages.  We’ve leveraged this core architecture across the product experience and raised the user experience bar for this type of application.  As well these capabilities are based on open standards and protocols, and are fully extensible by anyone- enabling sophisticated integrations to be created with a wide variety of both legacy and next-generation applications. Agile Product Development: As a product team we operate using continuous feedback and modified agile development methodologies.  We have thousands of active internal Oracle users who have helped pilot our product for critical business functions, and the On Track product development team uses our product as our primary vehicle for all our collaboration.  Additionally we been working with early access customers who are adopting our technology and providing us valuable feedback - which our process has rapidly realized in improvements to our software.  On Track agility extends to our server as well, which is built to scale, and is very simple to install and configure. We are pleased to make this product announcement and encourage you to join us on Facebook or follow us on Twitter, as well as checking back here for the latest product information.

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  • How can I debug a port/connectivity issue?

    - by rfw21
    I am running a simple WebSocket server on Amazon EC2 (Fedora Core). I've opened the relevant port using ec2-authorize, and checked that it's opened. Iptables is definitely not running. However I can't connect to the port from outside EC2. I've tried the following (my server is running on port 7000): telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (from within EC2: connects fine) nmap localhost (output includes line: 7000/tcp open afs3-fileserver) telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (this time from my local machine: I get "connection refused: Unable to connect to remote host") The strange thing is this: if I start Nginx on port 7000 then it works and I can connect from outside EC2! And the WebSocket server fails on port 80, where Nginx works fine. To me this suggests a problem with the WebSocket server, BUT I can connect to it successfully from within EC2. (And it works fine on a different VPS account). How can I debug this further? If anybody can stop me tearing my hair out, I'd be very grateful indeed :)

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  • How can I set up a local nameserver and modify DNS zones on it?

    - by Joe Hopfgartner
    This is a follow up to this question. I am having an issue with a Router that doesn't support hairpinning properly. See the link above for details. Now I want to set up a local DNS server that Hosts in our LAN can use to resolve public Hostnames (usual webbrowsing... ). Additionally I want to modify certain zones. In our LAN we have some servers serving resources that are not available in our public dns zone. We always have to configure our local LMHost files accordingly. For example we have a staging installation with a new feature running on a local Webserver, and we cannot access it with the IP directly because the website runs in a named virtual host container, we have to configure LMHost file to point some domain to the local IP address. And now we have also the Hair pinning issue. So my question is: What software can I use? Will bind do the job? I just need to insert some A entries into the zone. As easy as possible. We have local Linux/Ubuntu servers.

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  • Microsoft Windows DHCP: Steering IPv4 clients into specific scopes based on MAC

    - by Easter Sunshine
    We have visitors on our campus who bring their own laptops and devices and use our wireless and wired networks. When we receive a copyright infringement notice (typically BitTorrenting), we are required to quarantine that MAC address so that it no longer has Internet access. No matter what website it tries to visit, it is sent to a web page explaining to the user that the device has been quarantined. We have thus far implemented this in ISC DHCP on Linux. We have multiple VLANs with one or more public-IP subnets and one RFC1918 quarantine subnet each. All clients are leased IPs in the public-IP subnet(s) unless you're in a list of known bad MACs. Then, you are sent to the quarantine subnet so that your traffic is unroutable on the Internet (you are isolated by subnet only, not by VLAN). We would like to move to Windows DHCP in light of the IPAM role but I cannot figure out how to replicate this in Windows DHCP 2012 (Assign DHCP IPs for specific MAC prefixes on Windows Server 2008 R2 suggests it was not possible in 2008 R2), even while using policies. So here's what I'd like: The administrator/help desk provides and maintains a list of MAC addresses that are to be quarantined. The DHCP server places those MACs into the quarantine subnet on the respective VLAN, no matter which VLAN the client is in. I don't think reservations would work: We currently have about 300 registered bad MACs and about 12 VLANs. I don't want to make 300 x 12 reservations nor have to add 12 reservations per new MAC address. Not to mention all of the quarantine subnets are /24s. We do not have NPS/NAC. You do not have to register your MAC address get network access. We use Cisco routers/switches. Thanks.

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  • DallasXAML.com – A New User Group for Silverlight, WPF, XBAP, etc.

    - by vblasberg
                                     http://DallasXAML.com   I’ve devoted much of last month to starting the DallasXAML User Group.  I finally got back into user group management after 2 years away from leading the Dallas C# SIG.  Now I’m having fun getting a Silverlight/WPF user group going strong for the Dallas / Ft. Worth community.  Our first meeting was March 3rd at the Improving Enterprises offices in North Dallas.  We had about 25 to 35 attendees in the first meeting and it went well.  We covered the most important topic that everyone should understand well – data binding.   So I chose the XAML user group so we can get together for a common group improvement in the Dallas / Ft. Worth area and learn cross-technology information that we can use now.  It is not a lecture hall.  The great thing is that we’ll provide hands-on experience with most every meeting.  The goal is to get the experience that we can use the next work day.  I unfortunately broke that rule by speaking all through the first meeting, but next month is part two with more hands-on data binding.   The differentiation is this group concentrates on XAML, not Silverlight or Windows Client alone.  What we learn in one area, we gain for all areas.  That includes the Silverlight for Windows Phone 7 coming later this year.  Next year it may be Windows Phone 8, 9, or whatever.    I started developing WPF seriously almost a year ago.  I experienced the painful learning curve.  Anyone who reports that there isn’t a big learning curve either thinks in XAML before it was developed, is on the Silverlight or WPF development team, or has already conquered the learning and forgot the pain.  So I wanted to share the pain or make it easier for others – same thing.  I have found that the more I learn and use good disciplined techniques, the more interesting and rewarding development is again.   A few months ago, I was sitting in the iPhone development session at the Dallas C# SIG.  After the meeting, the audience was polled for future topics.  After a few suggestions, Silverlight got the big hands up.  That makes sense because it’s still the hot topic for many Microsoft developers.  So I surfed around and found that there aren’t enough user groups to help in this area.  I polled a few local group leaders and did the work to start the group.  This week I got a telerik controls licence and improved the site with some great controls, namely the RadHtmlPlaceholder control.  It provides a Silverlight control to show HTML in an IFrame-like area.  On DallasXAML.com, the newsletters and resource pages display in HTML because Silverlight just isn’t there yet.  I’m looking forward to a Silverlight XPS viewer with flow documents.  There are some good commercial version available, but this is a non-profit group.    The DallasXAML.com site points to many other resources such as podcasts and webcasts.  I would rather give them the credit than try to out-do them.  So check out the DallasXAML user group site and attend our meetings if you can.  We meet the first Tuesday of the month.   -Vince DallasXAML User Group Leader  

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  • How to route to a secondary interface on the same physical ethernet?

    - by sjose3612611
    INTERNET<->(wan)BRIDGED_DEVICE(lan)<->ETH_ROUTER<->LAN Problem: Need to access web server on BRIDGED_DEVICE's LAN from INTERNET via ROUTER (BRIDGED_DEVICE's web server cannot be accessed form INTERNET since it has no Public management IP). Cannot configure bridged device. It has a static IP on its LAN to which its web server binds. Attempt: Create a secondary/alias WAN Interface on ETH_ROUTER (e.g Primary: eth0.1 (for internet access) and Secondary: eth0.2 (for accessing web server on BRIDGED_DEVICE), (No VLANs). eth0.1 has a public IP; eth0.2 has a static private IP in the BRIDGED_DEVICE's subnet (e.g 10.0.X.Y). Iptables on ETH_ROUTER: Added a port forward (DNAT) from eth0.1 to eth0.2: iptables -t nat -I PREROUTING -i eth0.1 -p tcp --dport 80 -j DNAT --to-destination 10.0.X.Y iptables -t nat -I POSTROUTING -o eth0.2 -s 10.0.X.0/24 -j MASQUERADE Stateful firewall w/ overall drop policy on FORWARD chain, hence: iptables -I FORWARD -i eth0.1 -d 10.0.X.Y -p tcp --dport 80 -j ACCEPT Can ping from ETH_ROUTER to BRIDGED_DEVICE but unable to reach the web server from Internet. I see packet cont increasing for the DNAT rule but not sure where it disappears in the ETH_ROUTER after that. ETH_ROUTER is the only device that can be configured to achieve this. If familiar with this scenario, please suggest what I may be missing or doing wrong here or suggest techniques to debug?

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  • Stir Trek 2: Iron Man Edition

    Next month (7 May 2010) Ill be presenting at the second annual Stir Trek event in Columbus, Ohio. Stir Trek (so named because last year its themes mixed MIX and the opening of the Star Trek movie) is a very cool local event.  Its a lot of fun to present at and to attend, because of its unique venue: a movie theater.  And whats more, the cost of admission includes a private showing of a new movie (this year: Iron Man 2).  The sessions cover a variety of topics (not just Microsoft), similar to CodeMash.  The event recently sold out, so Im not telling you all of this so that you can go and sign up (though I believe you can get on the waitlist still).  Rather, this is pretty much just an excuse for me to talk about my session as a way to organize my thoughts. Im actually speaking on the same topic as I did last year, but the key difference is that last year the subject of my session was nowhere close to being released, and this year, its RTM (as of last week).  Thats right, the topic is Whats New in ASP.NET 4 how did you guess? Whats New in ASP.NET 4 So, just what *is* new in ASP.NET 4?  Hasnt Microsoft been spending all of their time on Silverlight and MVC the last few years?  Well, actually, no.  There are some pretty cool things that are now available out of the box in ASP.NET 4.  Theres a nice summary of the new features on MSDN.  Here is my super-brief summary: Extensible Output Caching use providers like distributed cache or file system cache Preload Web Applications IIS 7.5 only; avoid the startup tax for your site by preloading it. Permanent (301) Redirects are finally supported by the framework in one line of code, not two. Session State Compression Can speed up session access in a web farm environment.  Test it to see. Web Forms Features several of which mirror ASP.NET MVC advantages (viewstate, control ids) Set Meta Keywords and Description easily Granular and inheritable control over ViewState Support for more recent browsers and devices Routing (introduced in 3.5 SP1) some new features and zero web.config changes required Client ID control makes client manipulation of DOM elements much simpler. Row Selection in Data Controls fixed (id based, not row index based) FormView and ListView enhancements (less markup, more CSS compliant) New QueryExtender control makes filtering data from other Data Source Controls easy More CSS and Accessibility support Reduction of Tables and more control over output for other template controls Dynamic Data enhancements More control templates Support for inheritance in the Data Model New Attributes ASP.NET Chart Control (learn more) Lots of IDE enhancements Web Deploy tool My session will cover many but not all of these features.  Theres only an hour (3pm-4pm), and its right before the prize giveaway and movie showing, so Ill be moving quickly and most likely answering questions off-line via email after the talk. Hope to see you there! Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • How the number of indexes built on a table can impact performances?

    - by Davide Mauri
    We all know that putting too many indexes (I’m talking of non-clustered index only, of course) on table may produce performance problems due to the overhead that each index bring to all insert/update/delete operations on that table. But how much? I mean, we all agree – I think – that, generally speaking, having many indexes on a table is “bad”. But how bad it can be? How much the performance will degrade? And on a concurrent system how much this situation can also hurts SELECT performances? If SQL Server take more time to update a row on a table due to the amount of indexes it also has to update, this also means that locks will be held for more time, slowing down the perceived performance of all queries involved. I was quite curious to measure this, also because when teaching it’s by far more impressive and effective to show to attended a chart with the measured impact, so that they can really “feel” what it means! To do the tests, I’ve create a script that creates a table (that has a clustered index on the primary key which is an identity column) , loads 1000 rows into the table (inserting 1000 row using only one insert, instead of issuing 1000 insert of one row, in order to minimize the overhead needed to handle the transaction, that would have otherwise ), and measures the time taken to do it. The process is then repeated 16 times, each time adding a new index on the table, using columns from table in a round-robin fashion. Test are done against different row sizes, so that it’s possible to check if performance changes depending on row size. The result are interesting, although expected. This is the chart showing how much time it takes to insert 1000 on a table that has from 0 to 16 non-clustered indexes. Each test has been run 20 times in order to have an average value. The value has been cleaned from outliers value due to unpredictable performance fluctuations due to machine activity. The test shows that in a  table with a row size of 80 bytes, 1000 rows can be inserted in 9,05 msec if no indexes are present on the table, and the value grows up to 88 (!!!) msec when you have 16 indexes on it This means a impact on performance of 975%. That’s *huge*! Now, what happens if we have a bigger row size? Say that we have a table with a row size of 1520 byte. Here’s the data, from 0 to 16 indexes on that table: In this case we need near 22 msec to insert 1000 in a table with no indexes, but we need more that 500msec if the table has 16 active indexes! Now we’re talking of a 2410% impact on performance! Now we can have a tangible idea of what’s the impact of having (too?) many indexes on a table and also how the size of a row also impact performances. That’s why the golden rule of OLTP databases “few indexes, but good” is so true! (And in fact last week I saw a database with tables with 1700bytes row size and 23 (!!!) indexes on them!) This also means that a too heavy denormalization is really not a good idea (we’re always talking about OLTP systems, keep it in mind), since the performance get worse with the increase of the row size. So, be careful out there, and keep in mind the “equilibrium” is the key world of a database professional: equilibrium between read and write performance, between normalization and denormalization, between to few and too may indexes. PS Tests are done on a VMWare Workstation 7 VM with 2 CPU and 4 GB of Memory. Host machine is a Dell Precsioni M6500 with i7 Extreme X920 Quad-Core HT 2.0Ghz and 16Gb of RAM. Database is stored on a SSD Intel X-25E Drive, Simple Recovery Model, running on SQL Server 2008 R2. If you also want to to tests on your own, you can download the test script here: Open TestIndexPerformance.sql

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  • Two Candidates + One Job = Two Different Outcomes

    - by david.talamelli
    Recruiters have always headhunted (sidenote: I do not like this word, in general I think the type of people who use the phrase “headhunting” are the ones who are trying to sound more important than what they likely are). Any serious Recruiter engages in direct recruiting activity, it is part and parcel of the business it is not something unique. With the uptake in Social Media the past 4-5 years, we have seen an increase in the number of Recruiters proactively reaching out to people about job opportunities. We have also seen this activity increase across all levels of hire, from help desk roles to C-Level Executives. While getting approached about a role can be a nice boost to a person’s ego, do not let it give you an inflated sense of entitlement. It is The way that people handle themselves during these calls and subsequent interviews will have a large impact on their potential to land that job. Last week I spoke to two very different candidates, both about the same position and both with very different outcomes. On paper, Candidate #1 looked fantastic; they ticked many of the boxes that we were looking for. The person is working at global IT company and working in a similar role as the one we were hiring for but not in as senior as the role we had. This role would have been the perfect step to getting involved in more complex work for the person. Candidate #2 had less polished IT experience, ticked some of the boxes we were looking for and on paper in comparison to Candidate #1 was not as close a fit as Candidate #1 was. It seemed like I was comparing apples and oranges. After speaking to both candidates it turns out I was comparing apples and oranges except the person better suited for our role was not the one I was expecting it would be. The first candidate on paper looked great – they had the experience we were looking for and appeared to be just right for the role, but after talking to them, they gave me the impression that they thought the world owed them. The impression I was left with was that they did not equate success with hard work, they seemed more interested in “what is in it for me”. Rather than having a proper conversation with me, I was often cut off and asked to hurry it up when explaining our business, what we are doing, etc... . This person seemed more interested in the job title and money than how rather than think about ways to make the role successful. Candidate #2 who had limited experience, made up for any perceived lack of experience and them some with a demonstrated motivation to succeed and do the things needed to make that happen. Candidate #2 made a great first impression, they did not seem afraid of hard work and demonstrated a “team player” attitude. In talking to them they kept me engaged, listened and asked thoughtful questions that made me think this is the type of person who creates their own luck and who would thrive in a place like Oracle. Skills, capabilities, experience and a good resume can certainly get your foot in the door, but the wrong attitude or approach to work can close those opportunities just as easily. On the other hand, hard work, effort and a genuine work ethic may help open those doors that would otherwise closed for you. A resume with all the credentials gets you in the front door but that is just the beginning of the process. It is not how we start the race that is important, it’s how things end that matter most.

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  • Creating an Apache Virtual Directory, but updating Active Directory DNS

    - by SnoConeGod
    Hello all, I'm just getting started with using the Zend Framework and am following a recommended procedure where I am supposed to create an Apache Virtual Directory for the public-facing portion of a new Zend project. I don't THINK I had any issues creating the Virtual Directory, but my knowledge of the required DNS changes is rather lacking. The dev server I'm using is on a Microsoft Windows Active Directory domain, so I've added A records for both the server name and the subdomain. Still, trying to browse to the site from a Windows 7 PC isn't working properly. What am I missing? What's the proper set of steps for getting an Apache-served subdomain to appear properly in a peer computer's web browser? Details below: server: Debian command-line only, freshly installed today with Zend Server CE LAMP stack server name: ZENDEV subdomain: SQUARE.ZENDEV AD Domain functional level: 2008 mixed (run by a mishmash of 03 and 08 servers) attempting to visit the sites: http://square.zendev and http://square.zendev.domain.local (name of domain redacted, but using the local (not com) suffix) Apache Virtual Directory added to httpd.conf: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot "/var/www/square/public" ServerName square.localhost </VirtualHost> Is this only a problem with DNS? Or with DNS and my Virtual Directory? Thanks! John

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  • rsync general question

    - by CaptnLenz
    I'm trying to use rsync. At first, everything looks very good: rsync -Pniahv -e ssh /home/xxx/Videos/ [email protected]:"/shares/Public/Shared\ Videos/" --stats ... <f+++++++++ Serien/blah.avi <f+++++++++ Serien/blah S01E01 <f+++++++++ Serien/blah - S01E02 <f+++++++++ Serien/blah - S01E03 <f+++++++++ Serien/blah - S01E04 <f+++++++++ Serien/blah - S01E05 <f+++++++++ Serien/blah - S01E06 <f+++++++++ Serien/blah - S01E07 ... Number of files: 232 Number of files transferred: 223 Total file size: 118.24G bytes Total transferred file size: 117.51G bytes Literal data: 0 bytes Matched data: 0 bytes File list size: 9.46K File list generation time: 0.001 seconds File list transfer time: 0.000 seconds Total bytes sent: 10.18K Total bytes received: 712 After that, i copied some of the files manually and runned rsync again in dry mode: rsync -Pniahv -e ssh /home/xxx/Videos/ [email protected]:"/shares/Public/Shared\ Videos/" --stats ... <f..tpo.... Serien/blah.avi <f..tpo.... Serien/blah S01E01 <f..tpo.... Serien/blah - S01E02 <f..tpo.... Serien/blah - S01E03 <f..tpo.... Serien/blah - S01E04 <f..tpo.... Serien/blah - S01E05 <f..tpo.... Serien/blah - S01E06 <f..tpo.... Serien/blah - S01E07 ... Number of files: 232 Number of files transferred: 223 Total file size: 118.24G bytes Total transferred file size: 117.51G bytes Literal data: 0 bytes Matched data: 0 bytes File list size: 9.46K File list generation time: 0.001 seconds File list transfer time: 0.000 seconds Total bytes sent: 10.18K Total bytes received: 712 Why hasn't changed something in the --stats, although only the permissions and the timestamp have to be updated and not the full files need to be copied?

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  • AD domain on web servers behind NAT - DNS issues?

    - by Ant
    I'm trying to setup an AD domain to manage the security between two Windows Server 2008 webservers that will sooner or later use NLB to balance website requests. I've hit a problem which I think is a simple solution and is down to DNS. My website domain is mydomain.com. The two servers are running behind a NAT firewall on the 10.0.0.0 IP range. I've setup the AD domain to be called ad.mydomain.com (as recommended by MS and a few other answers to questions on here). The second web server however doesn't want to join the domain, and gives an error pinning the problem on DNS - "ensure that the domain name is typed correctly" even though it queries the SRV record successfully and gets the correct DC back - dc.ad.mydomain.com. Doing a dcdiag /test:dns on the DC gives the Delegation error 'DNS Server dc.mydomain.com Missing glue A record'. I have a feeling I need to add something to the public DNS so that it in some way knows about ad.mydomain.com. Can anyone suggest whether I'm on the right track in adding something to the public DNS? Or whether it's something else? Many thanks

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