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• Which is the best way to deploy a JBoss application?

  - by andreash

  Hi there, we are currently developing a JBoss application. To deploy it, we have a total of four servers (three years old). I am wondering which might be the best to do? There could be a load balancer (even a load-balancer cluster, for failover) in front of two servers, each holding one JBoss and one PostgreSQl host inside XEN environments. Does this make sense? Are there other, better options? Thanks a lot for your advice!

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• Storage and bandwidth for a social network

  - by user38141

  I guess i asked a dumb question earlier. I am fairly new at this. I have a socal network being built in PHP wit MYsql. I was wondering how much bandwidth and storage would allow users to have have 500mins of streaming video and allow them to store photos and videos. Please forgive me. I am not a technology guy and just doing some research as I am learning as I go along.

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• SharePoint Server Farm, what to do with an old server?

  - by tekiegreg

  Hi there, so we've procured a monster of a SQL Cluster and 4 screaming fast machines running the apps/WFE to start up our MOSS 2007 Enterprise Server farm, however I've got one server from the old server farm configuration that was just re-imaged and is still running decently, it's a 32 bit machine where the others are 64 bit machines so it really can't serve the same role as a 64 bit machine. I'd like to see if there's a role for it somewhere in the farm, a few thoughts: --Dedicated Search Query Server --Dedicated Excel Services Has anyone out there been in a similar situation? What did they do?

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• High availability for Windows Service under Windows Server 2003

  - by empi

  Hi. I have a following situation: I need to deploy a windows service that listens for incoming request on tcp port (basically WCF service). I have a High Availability requirement - the service must be deployed on two servers and if the service stops (only the service, not the whole server) on one server, all the requests must be redirected to the second one. For me it looks like a basic failover scenario. How can I achieve this on Windows Server 2003? Should I use Microsoft Cluster Service or Network Load Balancing? The important part is that the process of swapping the servers should not concern the clients (the client must see only single address / single host or domain name). Thanks in advance for help.

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• Manually accessing GMail via IMAP

  - by Jeff Mc

  I'm trying to connect to gmail imap, but I am unable to execute any commands after login. I'm running openssl s_client -connect imap.gmail.com:993 to connect then, * OK Gimap ready for requests from 128.146.221.118 42if6514983iwn.40 . CAPABILITY * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA XLIST CHILDREN XYZZY SASL-IR AUTH=XOAUTH . OK Thats all she wrote! 42if6514983iwn.40 . LOGIN {email removed} {password removed} * CAPABILITY IMAP4rev1 UNSELECT LITERAL+ IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE . OK {email removed} authenticated (Success) . CAPABILITY at which point it simply hangs with the connection open. I'm guessing gmail pushes you off to a node in a cluster after it authenticate me?

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• Sql Server Managmenet Studio Alternative - Are there any?

  - by JohnM2

  I am looking for lightweight MS SQL Server Managmenet Studio (2005) alternative (open source/freeware is a bonus). Something more like HeidiSQL for MySQL. LINQPad is not an option (although it's great for learning Linq). It can only query database (and has many cons for my needs). I am looking for management/alteration functionality also, not only making queries and viewing the results.

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• haproxy - pass original / remote ip in tcp mode

  - by Vito Botta

  I've got haproxy set up with keepalived for load balancing and ip failover of a percona cluster, and since it works great I'd like to use the same lb / failover for another service/daemon. I've configured haproxy this way: listen my_service 0.0.0.0:4567 mode tcp balance leastconn option tcpka contimeout 500000 clitimeout 500000 srvtimeout 500000 server host1 xxx.xxx.xxx.xx1:4567 check port 4567 inter 5000 rise 3 fall 3 server host2 xxx.xxx.xxx.xx2:4567 check port 4567 inter 5000 rise 3 fall 3 The load balancing works fine, but the service sees the IP of the load balancer instead of the actual IPs of the clients. In http mode it's quite easy to have haproxy pass along the remote IP, but how do I do in tcp mode? This is critical due to the nature of the service I need to load balance. Thanks! Vito

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• Can't find netbooted for Kerrighed pxe boot with Ubuntu Lucid Server

  - by Pengin

  I'm following installation guides for pxe booting and kerrighed. I can't find the package nfsbooted for Ubuntu 10.04. Where did it go? Context: At work I have access to 8 mini-ITX PCs and am trying to build a cluster. My plans include trying Condor, GridGain, Hadoop, and recently Kerrighed has caught my eye. (I reaslise these are all for different kinds of things, I'm just evaluating). Ideally, I'd like to have all the nodes network boot from a single server, since that seems so much easier to manage, plus I can 'borrow' additional PCs for a while without touching their HD. I've been getting on great with Ubuntu Lucid Server (10.04), trying to follow the only guides I can find to get pxe booting (and ultimately kerrighed) to work. This guide is for Ubuntu 8.04 and this one is for Debian. They both refer to a package I can't seem to find, nfsbooted. Has this package been replaced? Am I doing something daft?

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• process killed -- delete output file?

  - by user13743

  I have a bash script that runs on our shared web host. It does a dump of our mysql database and zips up the output file. Sometimes the mysqldump process gets killed, which leaves an incomplete sql file that still gets zipped. How do I get my script to 'notice' the killing and then delete the output file if the killing occurred?

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• Replicating/Synchronizng multiple tables across diffrent Databases on the same instance

  - by Idan

  I have few tables that needed to be replicated/synchronized across several databases in our SQL Server 2008 cluster. I know it's possible to replicate between multiple instances, but I'm looking for replication or synchronization in the same instance between specific tables of databases. The replicaiton/synchronization should happen every half-hour or so, but I don't mind it happening constantly. I can't use DROP the target table and INSERT (copy) the source table since there are many constraints. Reason for this is to not manage in the application layer and write to 2 different databases at the same time. Example: DB1 has T1, T2 and T3 - these are constantly being updated by the application, APP1 running on DB1. DB2 needs to have an updated copy of T1 at all times, also, there is a different application, APP2 runs only on DB2. Both DB1 and DB2 are located on the same instance, INST1. Would it be possible to replicate T1, T2 and T3 from DB1 to DB2 ? Thanks, Idan.

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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• Tomcat memory usage

  - by Adrian Mester

  I'm running tomcat on a ubuntu 10.4 VPS with 512MB of RAM (1024 burstable). I'm using it for development, so performance isn't an issue, but memory is. Tomcat is currently using about 250MB without any apps installed (I compared memory usage with tomcat stopped and running), and I also need to run lighttpd and mysql. Is there any way to get that number down? I don't need it to be able to handle a large number of requests at once.

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• Blocking HTTP clients which request certain URLs repeatedly

  - by Guido Domenici

  I run a website on Windows Server 2008 R2. Looking through the IIS logs, I have noticed that there are some IP addresses repeatedly requesting certain URLs (such as for example /mysql/phpmyadmin/main.php, /phpadmin/main.php) which do not exist, as the site is entirely served off of ASP.NET. They are obviously fishing for known vulnerabilities. My question is, are there any firewall or other tools (Windows built-in or commercial) that allow me to block those IP addresses which request certain URLs multiple times?

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• gem install rails gives me Error: undefined method include?

  - by johnlai2004

  I'm using ubuntu 9.10, apache 2 and mysql 5. I install ruby 1.8.7 on the server. I ran the command gem install -v 1.2.3 But then I get the error ERROR: While executing gem ... (NoMethodError) undefined method `include?' for nil:NilClass What did I do wrong?

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• Set up DPM to use hardware VSS Provider with EMC Clariion SAN

  - by Ryan

  We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines. I'm new when it comes to Clariion SAN's, so I have no idea how to set up the VSS provider. I downloaded something from Powerlink that was labeled VSS Provider and installed it on one of the machines connected to the SAN. It had something to do with a Solutions Enabler (I don't know what that is), but it doesn't really seem like it did anything. I read something that suggested I'd need to have Navisphere Manager to use the VSS Provider on the AX4, but we didn't purchase that - we're just using Navisphere Express. Can anyone help me figure out how to get the VSS Provider up and running?

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• Subversion/Hudson/Sonar/Artifactory - too much for my little server to handle! Help!

  - by Ricket

  I have a little dedicated server. It's at a cheap price and has a simple AMD 1800+ (1.5ghz), 256mb DDR RAM, ...need I continue? And I think I'm overloading it already. I have installed the following, and it's running CentOS 5.4: Webmin Apache MySQL Subversion as an Apache module Hudson (standalone) Sonar (standalone, runs with a standalone Jetty install) Artifactory (standalone) That's pretty much it. But I'm having problems; pages are loading quite slowly. Network speed of the server is excellent, but I think I'm just running out of CPU and/or memory. A side-effect of the pages loading slowly is that sometimes Hudson times out, not being able to start Maven or contact Sonar in a certain amount of time. I think the next step to speed things up might be to move to an application server and use the WAR version of Hudson, Sonar and Artifactory together on that server. I don't know that it will help, but it just seems to make sense, especially with Sonar running on its own Jetty install and the other two probably running their own mini application servers as well. Am I correct in thinking this? Is this the right course of action? Any other tips on how to make the server run faster? I can post more data if you'd like, just let me know what else would help you answer my question. Oh, also just to cure any suspicions, I don't have any sort of virus or spyware. I protect my SSH access with DenyHosts (which has blocked 300+ brute forcers in the past few months), and I have confirmed that the top four processes in terms of memory and CPU usage are Sonar, Artifactory, Hudson, and MySQL. Edit: I just thought of another thing that I'd like you to comment on as well: Apache currently has 8 spawned slave processes, taking 42MB of ram apiece. This is not my web server. Is everything else able to function if I shut down Apache? Can you point me towards a tutorial or something on migrating Subversion from Apache into something that might work along with the other three applications, maybe even make Subversion a WAR file or something?

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• Java Class path problem in cent os..

  - by Ramesh

  I have installed java in centos5 classpath is not working .... my bash_profile export PATH=$PATH:/zzz/jdk1.6.0_03/bin/ export JAVA_HOME=/zzz/jdk1.6.0_03/bin/java/ export CLASSPATH=$CLASSPATH:/zzz/aa/mysql.jar:. java -version java version "1.6.0" OpenJDK Runtime Environment (build 1.6.0-b09) OpenJDK Server VM (build 1.6.0-b09, mixed mode)

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• Is it advisable to run Apache in a chroot jail?

  - by morpheous

  I have been advised by a sysadmin guy I know, to run Apache in a chroot jail, for increased security. I have the following questions: Is this advisable (i.e. are there any 'gotcha's that I need to be aware of) ? Does running Apache in a chroot jail affect its ability issues like performance and scalability? He also advised that I run my databases (mySQL and PostgreSQL), in separate chroot jails. Is this something that is often done in production systems

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• windows vms unpredictibly require login

  - by marrrkus

  I have a cluster of vms on a number of cloned servers using libvirt/qemu. Occassionally the windows 7 vms randomly require a login screen, even though I've done everything I can think of and can google to turn off a login screen. I've used netplwiz to turn off requiring a password (http://pcsupport.about.com/od/windows7/ht/auto-logon-windows-7.htm) manually changed the regsistry using the instructions here: http://superuser.com/a/28654 changed requiring a password in the power saving settings in the control panel if the screen goes to sleep told the screen to never go to sleep (in the control panel) Even with all of these things, some of the vms *still* randomly require a login. I have no idea what else to try. Any ideas??

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• Why does ganglia think my host is down?

  - by NZKoz

  I have ganglia set up to monitor our staging server, it's working great but I'm confused by the definition of 'down' to ganglia. There's a single node, running gmetad, gmond and the web frontend, but some small percentage of the time the web frontend shows some confusing output. Despite the fact that it's a single server in the cluster, and that server is the one serving the web interface, the dashboard output insists that the host is down. Then below that it has a graph which shows 50% down, 50% up. You can see an example of this here: http://i.imgur.com/MCWaS.jpg There's obviously something confusing ganglia somewhere, but I'm not sure where to start looking. Unfortunately googling for any combination of 'ganglia' 'down' 'metric name' seems return nothing but other people's ganglia installations displaying the same nonsense. Any tips on where to start looking would be greatly appreciated

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• How to secure memcached?

  - by alfish

  In Debian, I have installed memcached (using this guide) to lower the otherwise unmanageable load on mysql database. The database is on a separate server, and memcached and Varnish are on the front server. Is it a potential security hole to leave memcached unprotected by a firewall? If so, how should I secure it? The situation is especially worrisome,as I've received (unproved) reports of cookie thefts on the server. Thanks

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• Windows Server Task Scheduler: Running scheduled executable fail-safe?

  - by Mikael Koskinen

  I have an executable which I've scheduled to run once in every five minutes (using Window's built-in Task Scheduler). It's crucial that this executable is run because it updates few time critical files. But how can I react if the virtual server running the executable goes down? At no point there shouldn't be more than 15 minutes break between the runs. As I'm using Windows Server and its Task Scheduler, I wonder is it possible to create some kind of a cluster which automatically handles the situation? The problem is that the server in question is running on Windows Azure and I don't think I can create actual clusters using the virtual machines. If the problem can be solved using a 3rd party tool, that's OK too. To generalize the question a little bit: How to make sure that an executable is run once in every 5 minutes, even if there might be server failures?

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• Configure all hosts, then create a list of the config for all hosts?

  - by AME

  I deployed a huge number of hosts with Ansible - which did work very nice. Each host got its individual settings and configuration. Now I'd like to generate a config file for another system that uses these hosts. For it, I need for every host a part of the generated configuration (the one that configures the database). Here is an example of the situation with two hosts having different configuration and the other system that uses a part of the Ansible-generated configuration: host1 ansible configured dbA host2 ansible configured dbQ The other system: host1 = dbA host2 = dbQ The values are computed differently (dbQ instead of dbB for host2 for example) if it belongs in a different cluster and so on, making it unpractical to just read out host configuration from the host_vars. I believe I would need to iterate over the hosts and let Ansible figure out the computed values for the variables like it would when deploying, but I do not know how to put that result in one template. Please advise :)

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• Installed LAMP, but PHP does not seem to work

  - by Dave

  Hello, I did the yum install for apache, mysql, php, phpmyadmin. localhost/phpmyadmin displays correctly. I would assume PHP function correctly. I put my webpages in /var/www/html/test_site/index.php. This page contains phpinfo. But it does not display an echo"test"; What could be wrong Thanks Dave

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• Multiple servers acting like a single one with all the hardware?

  - by marc.riera

  Hello, by now I have 10 servers for hpc, power computing oriented. My users need to launch several processes using qmake. The users are used to work with ubuntu 9.10, and the software from the repositories is switable for them. I've deployed ubuntu 9.10 to all 10 servers (pxe rocks). By now we work with parallel-ssh and cluster-ssh, which allows as to launch the same process to all servers. With this tools this tools the servers remain as independent but with the same software and the same launched command. Now we would like to go to next step and see all the servers as a single one with all the resources from the other 9 as if was its resources. The difference would be substantial in time to process and also time to design the command to launch. Any advice on wich software to use will be very useful? Thanks

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