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• Linux bash: when to use egrep instead of grep?

  - by Michael Mao

  Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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• Why does my DNS change (and break) at regular intervals?

  - by Peter Kelly

  I have a laptop running Windows 7. Up until recently, everything was fine. We have multiple devices in my house connecting to the one access point with no problems. No issues with ISP. Now my Windows 7 PC DNS settings change every minute or so. Before the problem occurs if I do an ipconfig /all I have two DNS settings (primary/secondary) and everything is fine. After a short period of time this change to a sole DNS, 10.0.0.1. Webpages no longer resolve. If I do an ipconfig /renew, this fixes the problem. I have tried uninstalling various programs I thought might be related but the problem persists. Any ideas of potential causes?

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• Edit files from Cyberduck in an existing Vim window

  - by Eli Gundry

  I use Cyberduck as my go to FTP client on Windows. I have but one complaint, and that is whenever I click the edit button to edit the remote file with a local version of gVim, it opens in a new window/instance of Vim. This leads to a cluttered desktop as well as not allowing the AutoComplPop to work at it's full potential. What I would like to be able to do is automatically open every file in a new buffer inside of an existing gVim buffer instead of a new window, kind of like the Windows version of gVim and how it has the option to edit a file in a new buffer. Is there anyway to do this in Cyberduck/gVim setting?

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• Kernel Errors in logwatch

  - by Vince Pettit

  We have a dedicated server running CentOS and Plesk. We've had the following show up on our logwatch and wondered if it is anything we should worry about? --------------------- Kernel Begin ------------------------ WARNING: Kernel Errors Present Northbridge Error, node 1K8 ECC ...: 1 Time(s) ---------------------- Kernel End ------------------------- We've contacted the support team that we rent our server from but they don't seem to want to help us out without us paying their support team a fixed charge and even then they can't guarantee they would be able to find a solution to any potential problems. Full log lines regarding Kernel error... Jun 16 19:45:25 server88-208-217-241 kernel: Northbridge Error, node 1<0>K8 ECC error. Jun 16 19:45:25 server88-208-217-241 kernel: EDAC amd64 MC1: CE ERROR_ADDRESS= 0x2a3d553e0 Jun 16 19:45:25 server88-208-217-241 kernel: EDAC MC1: CE page 0x2a3d55, offset 0x3e0, grain 0, syndrome 0x5041, row 3, channel 0, label "": amd64_edac

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• What is Peformance Monitor telling me when my page faults / second are high?

  - by David Robison

  I have a Windows 7 x64 computer that is having performance issues. After some investigation, I have discovered that the page faults / second on it, as reported by Performance Monitor, are really high. Everything else seems to be normal. Resource Monitor reports no hard faults and lots of available memory. Is this a potential cause for problems, or is it a red herring? If it is something that could be causing problems, what should I do next to figure out what is causing it? Here is a screen shot of the Performance Monitor. Notice that the average page faults / second is 75,887. On another computer that does not have problems, this number is closer to 3,000. Here is a screen shot of the Resource Monitor, sorted by hard faults / second, which is currently 0 for all processes.

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• Apache and fastcgi - How to secure an Apache server with fastcgi enabled?

  - by skyeagle

  I am running a headless server on Ubuntu 10.x. I am running Apache 2.2. I am writing a fastcgi application for deployment on the server. I remember reading a while back (I could be wrong) that running CGI (and by implication fastcgi) on a server, can provide 'backdoors' for potential attackers - or at the very least, could compromise the server if certain security measurements are not taken. My questions are: what are the security 'gotcha's that I have to be aware of if I am enabling mod_fastcgi on my Apache server? I want to run the fastcgi as a specific user (with restricted access) how do I do this?

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• Are there any HTPC-optimized web browsers?

  - by smackfu

  Features that I would ideally include in "HTPC-optimized": Full-screen. Navigable using a remote or the keyboard arrows. Legible at couch distances. Or, to put it another way, imagine the design requirements for Hulu Desktop or XBMC or WMC, applied to a web browser. Opera on a Wii meets most of these criteria but not being HD wastes a lot of potential. If a single solution doesn't exist, is there some combination of Firefox add-ons that will get me there?

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• non-interactively upload file to sftp server, using password

  - by matt

  Hello Guys, I know, this is not the recommended way to do this. But, I do not have another choice: I've got to set up a cron job that will regularly upload a file to an external SFTP Server (no FTP available, and I do only have a username/password for it but no key.) Still, I need to set up a cron that will regularly connect to that sftp and upload a file. sftp <<EOF put filename exit EOF therefore will not work, because sftp asks for the password, before STDIN is evaluated. What can I do, to pass the Password to sftp? Again: I am aware of the potential security risk, but I really do not have any choice here, and the server from which the file is uploaded is protected rather well.

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• How can I find out which driver/file is being loaded when the system hangs during the Windows 7 boot

  - by user24247

  My desktop computer (1 OS, 1 drive, 1 partition) hangs during the Windows 7 boot process. When selecting F8 I can select Safe Boot which allows me to see the files processed during the boot process. I know that the last line displayed is the last file that was SUCCESFULLY loaded. How do I find out what the next line, and the potential candidate driver/file/program would have been? The unusual thing, at least in my experience, is that the freezing up of the system also happens when I boot from the Windows 7 install disks, which is preventing me from any repair options. With a failure of both, I cannot not restore Windows 7 to a previous date or uninstall drivers/programs that may be the cause of the hanging. Thanks for your responses. Marc

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• Kaseya or Labtech for my managed services company?

  - by sean kubin

  I am torn between buying Kaseya or Labtech for my managed services company. Kaseya is 1400 mo for 1000 agents. the tech console is a beautiful web 2.0 web portal but only runs in IE Labtech is 589 mo for 500 agents. the tech console is a feature rich application that caches and syncs back to the server. very snappy no load time between clicks. Labtech and Kaseya promise the same features. Kaseya seems far more developed less bugs and just works, but Labtech looks better engineered is easier to get into and is rumored to be a potential Kaseya killer.

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• Does an SMTP request contain host header information (or just the IP of the targeted SMTP server)?

  - by Olaf

  We are using an external commercial smtp server for our newsletters (sending them through .NET components), and they offer two smtp URLs - smtp.critsend.com and fast.critsend.com -, and the second one is reserved for sending singular emails, the first one for bulk. Using nslookup shows that both resolve to the same 4 IP addresses (fast.critsend.com being an Alias). Question: (how) is it possible for the smtp relay to distinguish between different names? Is there something in the headers that can be compared to host headers in http protocol (I didn't find any intelligible information for a non-sysadmins)? The reason I'm asking is because we would like to use one of the IPs in our newsletter script (which works) rather than a name (in order to save DNS requests), and we are wondering about potential problems.

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• AirPlay over unicast DNS-SD. Anyone got it working?

  - by Moduspwnens

  We set up AirPrint using unicast DNS-SD on our campus about a year ago and it turned out to be a big success, so we're looking at trying to get AirPlay working so our faculty and students can wirelessly show content on our classroom projectors. There are still a couple of other things preventing an ideal implementation (username and password authentication, for starters), but I've been trying to set up a working demo nonetheless. Getting AirPrint working was basically just a matter of advertising the same records over a DNS-SD domain instead of the multicast (.local) one, but doing the same thing for AirPlay doesn't seem to cut it. The devices don't recognize the DNS-SD AirPlay servers as available. I've uploaded a screenshot of my DNS-SD configuration with the original (from AirServer, which works normally for multicast) here. I realize this is still a fairly new feature and documentation is lacking, but has anyone been able to get AirPlay working via DNS-SD? If it simply only works over multicast, I can accept that, but its potential is so appealing for us that I thought it'd be worth asking if anyone else has figured it out.

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• Intercept Apache communication

  - by Nathan Adams

  I am looking to develop a solution that eliminates potential spammers. The way this system will work is that it will watch connections and requests. Going into the specifics is more for stackoverflow, But, what I am interested in is if it is possible to tell Apache to pass the request over to my application first and give it the ability to accept/deny the request. Sure, it will make requests slower, but I think that is a trade off I am willing to take. I still want, however, Apache to run the request through any interpreters (such as PHP). The idea is that one wouldn't have to implement anti-spam measures on a per app basis but have an "umbrella" of spam protection.

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• Any InstallPad alternatives?

  - by ianfuture

  Hi, I'm about to install new bunch of software on a Windows XP Pro PC and found InstallPad as a potential method to do it all. However before using it I was wondering if there were any other similar apps that could be better or easier to use? Requirements (should haves more than must haves): - Free - Easy to use and configure - preferably from point and click in a GUI instead of command line params or config files - Robust - bug free or still in active/ongoing development - Some level of support or active community for help or tips - Pre-existing file lists that can be adapted for own use or used outright. Thanks in advance.. Ian

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• Unable to logoff, disconnect, or reset terminal server user in production environment

  - by l0c0b0x

  I'm looking for some ideas on how to disconnect, logoff, or reset a user's session in a 2008 Terminal Server (unable to login as the user either as it is completely locked-up). This is a production environment, so rebooting the server or doing something system-wide is out of the question for now. Any Powershell tricks to help us with this? We've tried to disconnect, log the user off and reset the session as well as killing the session's processes too, directly from the same terminal server (from the task manager, Terminal Services Manager and the Resource Monitor) with no results. Help! UPDATE: We ended up rebooting the server as no other attempts that we could think of worked. I'll leave this question open hoping someone might have more information about this one issue, and it's potential fixes

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• How do I find out what a Spam Custom Rule is?

  - by SoaperGEM

  We use a Barracuda Spam Filter at work, and we also provide a mass emailing program to some of clients that send out newsletters. Lately one of them's been composing his latest company newsletter and has been trying to send preview messages to himself, but they've actually been quarantined by Barracuda as potential spam, even though they aren't. I can see the breakdown of the spam scoring headers in Barracuda, but I'm not sure what certain rules mean. Here's the breakdown: pts rule name description ---- ---------------------- -------------------------------------------------- 0.00 FUZZY_CPILL BODY: Attempt to obfuscate words in spam 2.21 HTML_IMAGE_ONLY_24 BODY: HTML: images with 2000-2400 bytes of words 0.00 HTML_MESSAGE BODY: HTML included in message 0.50 BSF_SC0_SA_TO_FROM_ADDR_MATCH Sender Address Matches Recipient Address 1.00 BSF_SC0_SA392f Custom Rule SA392f What is "Custom Rule SA392f"? Where do I find descriptions of these custom rules? And what does "images with 2000-2400 bytes of words" mean? Is that referring to the file size of the image, or something about the attributes on the <img> tag?

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• Can I change a MySQL table back and forth between InnoDB and MyISAM without any problems?

  - by Daniel Magliola

  I have a site with a decently big database, 3Gb in size, a couple of tables with a dozen million records. It's currently 100% on MyISAM, and I have the feeling that the server is going slower than it should because of too much locking, so I'd like to try going to InnoDB and see if that makes things better. However, I need to do that directly in production, because obviously without load this doesn't make any difference. However, I'm a bit worried about this, because InnoDB actually has potential to be slower, so the question is: If I convert all tables to InnoDB and it turns out i'm worse off than before, can I go back to MyISAM without losing anything? Can you think of any problems I might encounter? (For example, I know that InnoDB stores all data in ONE big file that only gets bigger, can this be a problem?) Thank you very much Daniel

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• Is email forwarding to the sender's address usually blocked in Mail servers / MTA ?

  - by codecowboy

  I've noticed that email forwarding to an address seems not to work if I send an email from the address to which I am forwarding email. This happens for GMail and Fasthosts mail servers. e.g I send an email to [email protected] from [email protected] , [email protected] is set to forward to [email protected] and the email never arrives. I realise this seems logical but it is a potential cause of confusion when testing email functionality in a web application (for me, anyway ;-). I would just like to know if this is standard for all MTA software so I can avoid confusing myself.

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• IIS7.5 App Pool recycling. What is the best schedule for Recycling

  - by mikedopp

  I have been using IIS7.5 Since its release. I am also using commerce server 2007sp2. Due to Commerce Servers Need for memory and processor I have the app pool the website is assigned to recycling at midnight every night. My Question is what is the best time table to recycle heavy web app pools? I am looking to keep speed and not bump potential customers while recycling multiple times a day if possible. Another issue is that every few days the same app pool will hang and I have to force a reset of IIS to get it working again.

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• What hash should be used to ensure file integrity?

  - by Corey Ogburn

  It's no secret that large files offered up for download often are coupled with their MD5 or SHA-1 hash so that after you download you can verify the file's integrity. Are these still the best algorithms to use for this? Obviously these are very popular hashes that potential downloaders would have easy access to. Ignoring that factor, what hashes have the best properties for being used for this? For example, bcrypt would be horrible for this. It's designed to be slow. That would suck to use on your 7.4 GB dual layer OS ISO you just downloaded when a 12 letter password might take up to a second with the right parameters.

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• What would be the best way to correlate logs and events on several hosts?

  - by user220746

  I'm trying to build a log correlation system on multiple hosts. SEC seems interesting but I don't know if it will cover my needs. How could I correlate system events, logs, network events, etc. on multiple hosts at the same time, in real time? Examples: If 5 failed logins happened on host A the last minute and if firewall B has denied lots of access on differents ports on A, then we assume there is a potential attack in progress on A. If the Apache service on host A didn't receive any request for the last N minutes and Apache service on host B did, then the load balancing could be faulty.

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• Is SATA bandwith per Port or per Controller?

  - by instanceofTom

  I always assumed that it was per Controller channel, and that If I have 4xSATA 3.0Gb/s ports on my Motherboard then I should have a potential 12.0Gb/s of bandwith. However, after doing some searching I found conflicting information suggesting that if I had 4xSATA drives connected to my MB and were using them simultaneously each drive would get only 3.0Gb/s /4 = 768 Mb/s max bandwith. So I wanted to clear up my understanding. Side question: Are there other hdd/ssd bandwith bottlenecks to be aware of? (Links to already answered questions are more than welcome)

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• Is there still a place for tape storage?

  - by Jon Ericson

  We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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