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  • Can a NodeJS webserver handle multiple hostnames on the same IP?

    - by Matthew Patrick Cashatt
    I have just begun learning NodeJS and LOVE it so far. I have set up a Linux box to run it and, in learning to use the event-driven model, I am curious if I can use a common IP for multiple domain names. Could I point, for example, www.websiteA.com, www.websiteB.com, and www.websiteC.com all to the same IP (node webserver) and then route to the appropriate source files based on the request? Would this cause certain doom when it came to scaling to any reasonable size?

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  • How to Make Money Selling SPARC Webcast

    - by Cinzia Mascanzoni
    Join the webcast on Tuesday July 10, 2012 at 3PM CET (2pm GMT) The webcast will be hosted by - Rob Ludeman, from SPARC Product Management, and Thomas Ressler, WWA&C Alliances Consultant. Agenda: To bring you and your partners timely, valuable information,to increase success in selling SPARC systems. The webcast will be focused and targeted on specific topics and will last approximately in 30 minutes.You can submit your questions via WebEx chat and there will be a live Q&A session at the end of the webcast. REGISTER NOW! REGISTER

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  • Slicing the EDG

    - by Antony Reynolds
    Different SOA Domain Configurations In this blog entry I would like to introduce three different configurations for a SOA environment.  I have omitted load balancers and OTD/OHS as they introduce a whole new round of discussion.  For each possible deployment architecture I have identified some of the advantages. Super Domain This is a single EDG style domain for everything needed for SOA/OSB.   It extends the standard EDG slightly but otherwise assumes a single “super” domain. This is basically the SOA EDG.  I have broken out JMS servers and Coherence servers to improve scalability and reduce dependencies. Key Points Separate JMS allows those servers to be kept up separately from rest of SOA Domain, allowing JMS clients to post messages even if rest of domain is unavailable. JMS servers are only used to host application specific JMS destinations, SOA/OSB JMS destinations remain in relevant SOA/OSB managed servers. Separate Coherence servers allow OSB cache to be offloaded from OSB servers. Use of Coherence by other components as a shared infrastructure data grid service. Coherence cluster may be managed by WLS but more likely run as a standalone Coherence cluster. Benefits Single Administration Point (1 Admin Server) Closely follows EDG with addition of application specific JMS servers and standalone Coherence servers for OSB caching and application specific caches. Coherence grid can be scaled independent of OSB/SOA. JMS queues provide for inter-application communication. Drawbacks Patching is an all or nothing affair. Startup time for SOA may be slow if large number of composites deployed. Multiple Domains This extends the EDG into multiple domains, allowing separate management and update of these domains.  I see this type of configuration quite often with customers, although some don't have OWSM, others don't have separate Coherence etc. SOA & BAM are kept in the same domain as little benefit is obtained by separating them. Key Points Separate JMS allows those servers to be kept up separately from rest of SOA Domain, allowing JMS clients to post messages even if other domains are unavailable. JMS servers are only used to host application specific JMS destinations, SOA/OSB JMS destinations remain in relevant SOA/OSB managed servers. Separate Coherence servers allow OSB cache to be offloaded from OSB servers. Use of Coherence by other components as a shared infrastructure data grid service. Coherence cluster may be managed by WLS but more likely run as a standalone Coherence cluster. Benefits Follows EDG but in separate domains and with addition of application specific JMS servers and standalone Coherence servers for OSB caching and application specific caches. Coherence grid can be scaled independent of OSB/SOA. JMS queues provide for inter-application communication. Patch lifecycle of OSB/SOA/JMS are no longer lock stepped. JMS may be kept running independently of other domains allowing applications to insert messages fro later consumption by SOA/OSB. OSB may be kept running independent of other domains, allowing service virtualization to continue independent of other domains availability. All domains use same OWSM policy store (MDS-WSM). Drawbacks Multiple domains to manage and configure. Multiple Admin servers (single view requires use of Grid Control) Multiple Admin servers/WSM clusters waste resources. Additional homes needed to enjoy benefits of separate patching. Cross domain trust needs setting up to simplify cross domain interactions. Startup time for SOA may be slow if large number of composites deployed. Shared Service Environment This model extends the previous multiple domain arrangement to provide a true shared service environment.This extends the previous model by allowing multiple additional SOA domains and/or other domains to take advantage of the shared services.  Only one non-shared domain is shown, but there could be multiple, allowing groups of applications to share patching independent of other application groups. Key Points Separate JMS allows those servers to be kept up separately from rest of SOA Domain, allowing JMS clients to post messages even if other domains are unavailable. JMS servers are only used to host application specific JMS destinations, SOA/OSB JMS destinations remain in relevant SOA/OSB managed servers. Separate Coherence servers allow OSB cache to be offloaded from OSB servers. Use of Coherence by other components as a shared infrastructure data grid service Coherence cluster may be managed by WLS but more likely run as a standalone Coherence cluster. Shared SOA Domain hosts Human Workflow Tasks BAM Common "utility" composites Single OSB domain provides "Enterprise Service Bus" All domains use same OWSM policy store (MDS-WSM) Benefits Follows EDG but in separate domains and with addition of application specific JMS servers and standalone Coherence servers for OSB caching and application specific caches. Coherence grid can be scaled independent of OSB/SOA. JMS queues provide for inter-application communication. Patch lifecycle of OSB/SOA/JMS are no longer lock stepped. JMS may be kept running independently of other domains allowing applications to insert messages fro later consumption by SOA/OSB. OSB may be kept running independent of other domains, allowing service virtualization to continue independent of other domains availability. All domains use same OWSM policy store (MDS-WSM). Supports large numbers of deployed composites in multiple domains. Single URL for Human Workflow end users. Single URL for BAM end users. Drawbacks Multiple domains to manage and configure. Multiple Admin servers (single view requires use of Grid Control) Multiple Admin servers/WSM clusters waste resources. Additional homes needed to enjoy benefits of separate patching. Cross domain trust needs setting up to simplify cross domain interactions. Human Workflow needs to be specially configured to point to shared services domain. Summary The alternatives in this blog allow for patching to have different impacts, depending on the model chosen.  Each organization must decide the tradeoffs for itself.  One extreme is to go for the shared services model and have one domain per SOA application.  This requires a lot of administration of the multiple domains.  The other extreme is to have a single super domain.  This makes the entire enterprise susceptible to an outage at the same time due to patching or other domain level changes.  Hopefully this blog will help your organization choose the right model for you.

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  • .pam_environment in kerberized nfs4 home directory

    - by Paul Stoever
    How can I get pam_env to read the user's .pam_environment file, if the user's file is located in a kerberized NFS4 mount? The file and directory permissions for the .pam_environment file are set in a way, that allows the local root to read the file. Reading .pam_environment only fails on the first login. Subsequent logins successfully read the file. The client uses Ubuntu 12.04 Desktop, NFS/Kerberos server is 12.04 Server. The Kerberos/NFS4 stuff works with exception of this. From /var/log/auth for first login: ... lightdm: pam_krb5(lightdm:auth): user USERNAME authenticated as USERNAME@REALM lightdm: pam_unix(lightdm:session): session closed for user lightdm lightdm: pam_env(lightdm:setcred): Unable to open config file: USERHOME/.pam_environment: Permission denied lightdm: pam_env(lightdm:setcred): Unable to open config file: USERHOME/.pam_environment: Permission denied lightdm: pam_unix(lightdm:session): session opened for user USERNAME by (uid=0) ...

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  • New Virtual Compute Appliance Videos

    - by Cinzia Mascanzoni
    Watch the latest Virtual Compute Appliance videos to aid your conversations with partners and customers! Virtual Compute Appliance Flash demo shows your customers and partners the business benefits. VCA Product demo. Tier1 Customer Testimonial Video of using Oracle's Virtual Compute Appliance to build a private cloud virtualization platform to host its customers’ Oracle Enterprise and Windows applications. Centroid Partner Testimonial Video.

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  • Game engine design: Multiplayer and listen servers

    - by jarx
    My game engine right now consists of a working singleplayer part. I'm now starting to think about how to do the multiplayer part. I have found out that many games actually don't have a real singleplayer mode, but when playing alone you are actually hosting a local server as well, and almost everything runs as if you were in multiplayer (except that the data packets can be passed over an alternate route for better performance) My engine would need major refactoring to adapt to this model. There would be three possible modes: Dedicated client, Dedicated server and Client-Server (listen mode) * How often is the listen-server model used in the gaming industry? * What are the (dis)advantages of it? * What other options do I have?

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  • About online game servers and how to handle data

    - by TreantBG
    So my question isn't about what technology to use or how to do this or that, but a more general question. I'm currently developing a action third person shooter. With elements of RPG - weapon,armor upgrades and items. Players will be able to create new games or join old ones. So my question is how to create the game server that players will play in. I have two ideas on my mind. The player who made the game is the server. All data passes trough him and he send this data to the server updating the database of the players with their XP points kills/deaths score and other. Or my host machine is the server, the player who made the game just will open new instance on my host and will be like client. And all players send their input data to the host, the host updates the game and send response back to client for any new changes like where is the enemy and other. And if i choose option 1 is there a chance the host to change the game content and manipulate the game results? (I think there is but i'm not sure) And if i choose option 2 isn't that raising the response time and potentially the game lag? or maybe there is another option?

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  • Hosting several HTTP servers on single domain name

    - by Nakilon
    Several people have got a single domain name server.company.com server, where they are now supposed to host their infrastructure or temporal projects, written in different ways even in different programming languages. How do they divide the domain? Split into subdomains: john.server.company.com, kate.server.company.com, etc. This would need a lot of admins' assistance, time, etc. -- there would be no way for John and Kate to do it themselves. Split into url namespaces: server.company.com/john/, server.company.com/kate/, etc. Pro: They now can make a single welcome page at root with any additional info (if they need?) Con: Each server would need to know their namespace string constant, and hrefs like / whould need patching. Split into ports: server.company.com:8080, server.company.com:8081, etc. and make a single :80 welcome page. Pro: They still can make a single welcome page at :80 Con: ??? I would like to know more pros and cons for 2 and 3 solution.

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  • How to query a DHCP server to get the local DNS servers

    - by Dan Berlyoung
    I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a) reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b) calling their tech support (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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  • Exchange Management Console Listing Extra Servers

    - by Zak G
    I recently decommissioned an Old Exchange 2003 server. Prior to the decommissioning, the environment consisted of 2 EXCH 2010 and that one EXCH 2003 server. I went through all the steps listed in Microsoft documents and online in how to remove the server completely (pruning the AD and all that jazz). When I go to Exchange Management Console it still lists 3 total servers in the "Server Summary" column in the Organizational Health tab. When I click manage servers, it only lists the 2 EXCH 2010 servers. I am aware this is only a cosmetic issue but I would appreciate it if anyone can share some advice on how to fix the issue.

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  • A Quarter Century of SPARC

    - by kemer
    You might have missed an interesting milestone: the 25th anniversary of SPARC. Twenty-five years! Almost 40% of my life: humbling, maybe a little scary. When I joined Sun Microsystems in 1988, SPARC was just starting to shake things up. The next year we introduced the SPARCstation 1, which had basically triple the performance of our Motrolla-based Sun–3 systems. Not too long after that, our competition began a campaign of “SPARC is dead.” We really distressed them with our success, in spite of our small size. “It won’t last.” “It can’t last!” So they told themselves. For a stroll down memory lane take a look at this page. I remember the sales meeting we had in Atlanta to internally announce the SPARCstation 1. Sun hadn’t really hit the big times, yet. Our much bigger competitors viewed us as an ill-mannered pest, certain of our demise. And, why wouldn’t they be certain: other startups more our size, such as Apollo (remember them?), Silicon Graphics (they fought the good fight!), and the incredibly cool Symbolics are memories. Wait! There was also a BIG company, DEC, who scoffed at us: they are history, too. In fact, we really upset them with what was supposed to be an internal-only video production that was a take-off on Bruce Lee movies, in which we battled the evil Doctor DEC – complete with computer mice (or is that “mouses”?) wielded like nun chucks with the new SPARCstation 1 somehow in the middle of everything. The memory is vivid, but the details hazy. After all, that was almost a quarter century ago. So, here’s to Oracle’s SPARC: still going strong after all these years. – Kemer

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  • Secure copying (file transfer) between two Linux servers in the same datacenter (Linode)

    - by MountainX
    I have two Linodes in the same data center. I want to copy files from one to the other each night or on demand (for about the next month, until this project is finished). So I'm thinking about using rsync. My question is how do I set up the two Linode servers to communicate via private IP addresses securely? Both servers are SSH hardened, they use denyhosts and have a fairly restrictive iptables setup. I know I need to first assign private IP addresses to each server, then configure static networking according to this guide. What is next? What SSH or iptables settings are needed to allow these two servers to communicate? What further info do I need to supply in this question? I'm looking for a basic step-by-step guide for how to do this.

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  • How to Turn Your Home Ubuntu PC Into a LAMP Web Server

    - by YatriTrivedi
    Got a Linux PC you want to put to work? Maybe you’re not comfortable with the command-line only version of Ubuntu Server Edition. Here’s how to keep the standard Ubuntu desktop and add web-serving capabilities to it. Whether you’re not comfortable with a command-line only system, you’re using your Ubuntu desktop for other things, or you just need it installed for a few particular apps, you can add Apache, MySQL, and PHP to any standard desktop installation of Ubuntu very quickly and easily Latest Features How-To Geek ETC How to Integrate Dropbox with Pages, Keynote, and Numbers on iPad RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean? How to Recover that Photo, Picture or File You Deleted Accidentally How To Colorize Black and White Vintage Photographs in Photoshop How To Get SSH Command-Line Access to Windows 7 Using Cygwin The How-To Geek Video Guide to Using Windows 7 Speech Recognition Stylebot Customizes Web Pages in Chrome, Now Has Downloadable Styles Blackberry, Dell, Apple, and Motorola Tablets Compared [Infographic] Encrypt Your Google Search Queries Vintage Posters Showcase the History of Tech Advertising Google Cloud Print Extension Lets You Print Doc/PDF/Txt Files from Web Sites Hack a $10 Flashlight into an Ultra-bright Premium One

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  • T-SQL Tuesday #15 : Running T-SQL workloads remotely on multiple servers

    - by AaronBertrand
    This month's installment of T-SQL Tuesday is hosted by Pat Wright ( blog | twitter ). Pat says: "So the topic I have chosen for this month is Automation! It can be Automation with T-SQL or with Powershell or a mix of both. Give us your best tips/tricks and ideas for making our lives easier through Automation." In a recent project, we've had a need to run concurrent workloads on as many as 100 instances of SQL Server in a test environment. A goal, obviously, is to accomplish this without having to...(read more)

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  • Why Dedicated Servers Make Good Business Sense

    When your company begins the process of creating a website, there are several things you have to keep in mind. One of the first questions is what kind of web hosting service does your business requir... [Author: Shane Watson - Web Design and Development - April 20, 2010]

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  • The Home Stretch: NetBeans IDE 7.1 Release Candidate

    - by TinuA
    The first release candidate build of NetBeans IDE 7.1 is live and available for download, which means the big release (GA) is expected any day soon.NetBeans IDE 7.1 delivers support for JavaFX 2.0, enabling the full compile, debug and profile development cycle for JavaFX 2.0 applications and keeping developers in sync with the latest from the Java platform. Beyond JavaFX support, 7.1 also provides significant Swing GUI Builder enhancements, CSS3 support, and visual debugging tools for JavaFX and Swing user interfaces. And Git--a much anticipated featured--has been integrated into the IDE."The entire NetBeans team is tremendously excited about this release, which provides developers with more state-of-the-art tools for building front-end clients," says NetBeans Engineering Director John Jullion-Ceccarelli. "Whether you are doing JavaFX, HTML5, Swing, or JSF, NetBeans 7.1 will let you quickly and easily develop great-looking and full-featured clients for your Java or PHP-based applications."But there's one more task to check off before the general availability: The NetBeans team has launched a Community Acceptance Survey to get user feedback about the release candidate. Download the RC build, test it and take the survey to let the team know if NetBeans IDE 7.1 is ready for its debut!

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  • suggestions for lonewolf dev setup

    - by d33j
    I'm looking for some suggestions for a better development setup. Background: I'm a crusty old software engineer (mostly java of late) and I have around 50 - 100 incomplete java projects scattered everywhere, usb keys, HDDs, and spanning across 5 or 6 computers etc, which have been put on hold for a few years (ie: family). I have no version control at home. I've been using IntelliJ for around 10 years, so that's the only constant. I'm thinking of nominating one machine as a headless server to put all my projects on, maybe a ubuntu box, that way It won't matter which device I'm on, all my projects can be accessed (and I don't have to waste time actually looking for them). I don't need to access code over the net. These are my own 'happy place' projects so I only work on them when I'm at home, however I can see the benefit of the tasking app being online, that way if I think of something while on public transport lets say, I can add it then & there, but it's not a requirement. I can wait until I get home to create tasks. Summary: So I need some sort of version control so I can rollback mistakes, and some sort of simple tasking software where I can assign tasks for myself later on when I get time. I use Subversion, Sonar, Jira and Crucible at work but I think it's a little bit of an overkill for me though. What do you suggest?

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  • Same command on multiple servers

    - by w00t
    Hello everyone. I'm just wondering if there is any fellow sysadmin with the need to execute one command on multiple servers. If so, what technique are you using? I have grown tired to ssh-ing to 3-5 servers and executing the same thing over and over again, so I'm thinking to make my life easier. Also, I think I should create keys so I don't have to enter passwords anymore (though I'm using root). After 2 years of doing this, I kind of developed a laziness. I googled it up, I know about cssh, pssh, tentakel (this one seems cool), and the more pro-genre - Puppet (of which I just heard of, didn't invest the time to read the docs). BTW, I'm using XP+putty, so if there is any putty-cool-thingy available, that's welcome too. If not, I can always ssh to one server and from there start my rest-of-the-servers-conquest :) *evil* Hit me up. Thanks.

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  • mulktiple domain names and site behind one ipaddress/gateway

    - by RandomOzzy
    looking to host a handful of sites for myself, family and a couple of friends. i'm running ubuntu 14.04, with a bind9 authoritative name server, apache2, mysql, php5, postfix/dovecot... i have everything running with a single domain i'm already paying for. looking to run multiple sites, some with their own domains, with out having to pay for more ip address's or 3rd party services, other then the individual dns names. thanks andrew

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  • glusterfs to replicate files to other servers

    - by sbrattla
    I've got multiple servers which all need to have the same content in /home. In other words, if the file /home/user1/test.txt is updated on server A, this needs to be replicated to all other servers in the cluster. Is it possible to use GlusterFS for this purpose? That is, let each server have a full copy of all data locally - which that server will be working on - and solely use GlusterFS to take care of replicating this data to the other servers? I'm not intersted in a combined storage, but rather have all data on all machines only to have GlusterFS to replicate it to the other machines.

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  • Oracle - Xsigo Webcasts coming soon

    - by Cinzia Mascanzoni
    Join us as we provide insight into the overall Oracle-Xsigo product strategy and primary sales plays. We will also discuss sales benefits available through Oracle’s partner program, as well as next steps to get partners ready to resell through OPN. Please make note of our webcasts: November 13 at 3 pm GMT - 4 pm CET  - Xsigo Systems VAD Update Webcast: Understanding the Xsigo Channel Model & Product Strategies . Register here. November 15 at 3 pm GMT - 4 pm CET - Xsigo Systems OPN Partner Update Webcast: Get Ready to Sell Xsigo Systems Products with Oracle. Register here.

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  • Where do I set my SPF record?

    - by Misha
    Many years ago we purchased a domain from Yahoo. Now our website is hosted on Amazon EC2. The output of an SPF checking tool (http://www.kitterman.com/getspf2.py) says SPF records are primarily published in DNS as TXT records. The TXT records found for your domain are: i=182&m=bizmail-mx2-p9 SPF records should also be published in DNS as type SPF records. No type SPF records found. Checking to see if there is a valid SPF record. No valid SPF record found of either type TXT or type SPF. Where do I get access to these values? Can somebody speculate, where can I find an interface, or a configuration file to fill in the missing fields?

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  • T-SQL Tuesday #15 : Running T-SQL workloads remotely on multiple servers

    - by AaronBertrand
    This month's installment of T-SQL Tuesday is hosted by Pat Wright ( blog | twitter ). Pat says: "So the topic I have chosen for this month is Automation! It can be Automation with T-SQL or with Powershell or a mix of both. Give us your best tips/tricks and ideas for making our lives easier through Automation." In a project we are working on, we've had a need to run concurrent workloads on as many as 100 instances of SQL Server in a test environment. A goal, obviously, is to accomplish this without...(read more)

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  • VPN provider for remote access to servers from a known IP address

    - by brentkeller
    My organization has a few servers that are being hosted by a provider and we limit remote access to a whitelist and deny access to any IPs not on the whitelist. We would like to find a hosted VPN service that we can connect to that would give us a known IP that we could add to our whitelist and gain access to the servers while on the road. Does anyone know of any such services? I don't think we can just setup the VPN built in to Windows Server since the servers are hosted. Any suggestions would be appreciated.

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