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• Membership numbers

  - by Ron Bruce

  I currently use phpMyAdmin 3.2.4 to monitor and manage the membership numbers for my organization members website. Not to long ago the member numbers jumped from 750 to 1,000,000 just over night? I am not sure how to fix this. I am new at this and I am not that famaliar of how this all works. This working with MySQL database. Also where so I fined on line manuals for phpMyAdmin and MySql? Respectfully Ron

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• BackupExec 12 to Bacula questions

  - by LVDave

  We have a 128 node compute cluster for environmental modeling, with a master/head node which we currently backup with a Windows2003 system running BackupExec 12 and a single HP LTO3 tape drive. We have recently ordered an Overland NEO200s 12 slot library, and are considering migrating off Windows to CentOS 5 for the backup server. The master/head node is RHEL5, with the compute nodes currently being migrated from a mix of RHEL3/4/5 to CentOS5. I'm fairly familiar with RH/Centos, but have no experience with Bacula. We've tentatively settled on Bacula as our cluster vendor recommended it. My questions are: 1) Does Bacula support an Overland NEO200s/LTO3 library? 2) Can Bacula catalog/restore tapes written by BE? and 3) I've head of Amanda, but am even more unfamiliar with it than Bacula. Any assistance would be appreciated Dave Frandin

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• List of freely available system administrator books

  - by Sharjeel Sayed

  On the lines of http://stackoverflow.com/questions/194812/list-of-freely-available-programming-books, I'm trying to create a wiki of system administrator books with open source licenses, like Creative Commons, GPL, etc. Feel free to pour in your recommendations. Linux Linux Network Administrator's Guide, 2nd Edition Bash Advanced Bash-Scripting Guide MySQL MySQL Documentation Apache Apache Dektop Reference Networking TCP/IP Tutorial and Technical Overview

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• How do I debug this FS error on a flash device?

  - by abc

  I have console access to an embedded linux device. This device has flash memory part of which is partitioned as a FAT filesystem. Its running linux-2.6.31. However I am seeing these errors on the console these days and the FAT file system becomes read only. 111109:154925 FAT: Filesystem error (dev loop0) 111109:154925 fat_get_cluster: invalid cluster chain (i_pos 0) 111109:154925 FAT: Filesystem error (dev loop0) 111109:154925 fat_get_cluster: invalid cluster chain (i_pos 0) I cannot understand why this happened? What is the root cause? And what is the fix? I would appreciate answers that can point me how to investigate the possible root cause of this issue on the device.

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• Launch only the command if the previous one worked inside SSH, SHELL

  - by Namari

  I've got a SHELL script which is using a pipe to separate my 2 commands: ssh -oBatchMode=yes user@hostname "mysql -u yop -pyop -c yop | echo test" The problem is even if my connection to mysql doesn't work, it send the echo test. I would like to forbid my script to send any command if the previous command doesn't work. I search with a if condition but it seems it not possible with it :( Does anyone have an idea ? Thanks, Namari

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• How do you handle reboots?

  - by Mart

  We have one VPS (Windows 2008 R2+IIS7.5), with an asp.net mvc 3 application. The main question is: how to handle issues when Windows needs to reboot? (after installing Windows Updates or anything else). The goal is to make the website 24/7, but first it's ok to show a message to the users. (we'll be back soon, something like app_offline.htm) Our application uses SQL and also writes/reads some files (uploaded photos, documents) which are not stored in SQL. What do you recommend? Load balancing with ARR? (with 1+2 servers, but what if the front-end server needs reboot?) Windows failover cluster? SQL failover cluster? What to do with uploaded files? I really don't know what would be the best (and simplest) solution.

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• Install / Start Apache HTTP Server on Windows [closed]

  - by Bagira

  I have downloaded the Apache HTTP Server 2.4 from Here and after extracting the zip file i can see a couple of folders but I could not figure out how to start / install server. I want to install server standalone i.e. without PHP / MySQL. This s because I have already MySQL installed and I don't want to use PHP. I want Apache HTTP server to communicate with Apache tomcat. I am using Windows Vista.

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• BixData or Zabbix?

  - by Arafat

  Hi all, I've been using Ganglia to monitor my single Mac OSX server which runs Apache and MySQL. I'm ok with it. Now we are upgrading our servers, 6 IBM X3650 M3 and 2 Fujitsu servers. 2 IBM for Apache cluster and 4 IBM for MySQL NDB Cluster. The other two servers are for Load balancers. All servers are going to run Debian Lenny 5 on it. Now I need to decide on which monitoring tool I should go for. I found that BixData and Zabbix does an excellent job than Ganglia, in terms of sensors and reporting. Have anyone tried the above two tools? And which tool would you suggest me? For Debian. As I'm writing this, I'm installing BixData to try.... Thanks in advance.

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• can't connect to Sql Sever Management Express 2012

  - by Rare-Man

  i installed Sql Sever Management Express 2012 , but when i try to connect in Sql management studio enviroment , i have this error . TITLE: Connect to Server Cannot connect to .. ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476 The system cannot find the file specified BUTTONS: OK ................................................................................... and in during installion i dont have option for select cluster !! this is my SQL Server Configuration Manager , my sql server service is empty ... And when get Remove a Failover Cluster Node , this error happened . http://oi57.tinypic.com/2lrvat.jpg

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• Ubuntu upstart sysvinit integration

  - by Eli

  Hi, I use ubuntu lucid server and have a sysvinit start up script thats been working for me for years. I only started using lucid recently, and found out about upstart when my script stopped working. The script depends on mysql server, which unlike in older versions, now uses upstart. Migrating my script to upstart isn't an alternative for now. I would like to continue using my sysvinit, but how do I make sure it starts after mysql? Rgds, Eli

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• (simple) linux HA with vmware vsphere?

  - by derhelge

  I hope my upcoming question is specific enough, and you are able and willing to support :-) We have several openSUSE VMs in an ESX-Cluster (three ESX-Servers) with an attached iSCSI-SAN. All of those Linux VMs are "single point of failure"-configured, which means in the case of a Web-Server: LAMP, storage, etc. everything on this machine. This was very simple and in case of a failure (in the last years: kernel panics or apache crashes) a simple reboot triggered by a script did it. But the problem is: How to upgrade/maintain the w(eb-)application or the underlying OS without downtime? This wasn't really managable and i did this in the early morning ;) How can i achieve a "simple" High-Availability Cluster now? I thought of: DRBD with heartbeat with 2 VMs. And for the storage a RDM (raw device mapped) LUN and change the read-write-permissions for both VMs. Is this a good idea? Anyone has a better solution?

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• configure cisco catalyst 3560g with an egress uplink

  - by imaginative

  Currently my setup has our egress uplink connected directly to an external interface on a linux router/firewall/nat gateway. Since the linux box is a single point of failure, I've since setup two openbsd boxes using carp+pf+pfsync in order to gain some additional redundancy. the problem is, I only have one egress uplink (it's still a single point of failure) but need to get it to speak to the active carp node in my openbsd cluster which will server as my new router/firewall/nat cluster. Is there anything specific I need to do on a 3560G in order for me to be able to: 1) Drop the egress uplink into a port 2) Drop one link from the switch to a firewall 2) Drop a second link from a switch to the firewall This is so if one box dies, the other still has the egress link to the switch. Is putting them into one VLAN enough? Anything else that needs to go into the configuration for this setup to work?

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• What email server should I choose?

  - by DCC

  I need a secure email server installed in debian-lenny with users in a mysql table. Also users are from multiple domains. Quota should be in mysql or a global variable for all users. What are my options ? THanks in advance for your help.

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• Cannot WMI Query root\MSCluster namespace as Local Admin

  - by Matt Zuberko

  I'm trying to use WMI Explorer to query the root\MSCluster namespace on various hosts to obtain cluster resource group and resource object data. I can access the namespace with no issue on Win2K3 cluster nodes but am getting an access denied error attempting to connect to Win2K8 and Win2K8R2 nodes. I can access the root\cimv2 namespace with no issue, just the MSCluster namespace even though I am a local Admin. Is there a feature setting, local security policy or server role I have to be a member of to access the namespace? Thank you!

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• DPM Coordinator Service is not responding

  - by Anatoly Vilchinsky

  Hi dear Gurus! I'm in stuck point now, so please at least try to help me. I've installed DPM 2010 on cluster server (w2k8 r2), everything was fine. Than I've tried tot install Protection Agent on both server of my cluster, but I'm getting error Error 312: The agent operation failed because the DPM Agent Coordinator service is not responding. Error details: The service cannot be started, either because it is disabled or because it has no enabled devices associated with it (0x80070422) Recommended action: Restart the DPM Agent Coordinator service on . And the thing is that I'm totally can't see DPM Agent Coordinator service not on the localhost, nor on the second server. All the suggestion, that I've found in the internet are suggesting to restart this service, but how can I perform this if the one is absent? I'll be glad for any help

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• libvirt + ESX (HTTP response code 400 for call to 'Login')

  - by Coops

  I'm trying to connect to a vSphere cluster using the information from the libvirt documentation. $ virsh -c "vpx://[email protected]/dc1/dc1-cluster-e01/dc1-vsphere-e04/?no_verify=1" Enter root's password for 10.51.4.11: error: internal error HTTP response code 400 for call to 'Login' error: failed to connect to the hypervisor I seem to be able to establish a connection, but it fails with a "HTTP code 400". If I provide the incorrect password it fails with a 'login credentials' error, so it looks like I am getting a connection, but it's failing for another reason. Wireshark is no help as it's all done over SSL/TLS. Any thoughts folks? UPDATE: 15:21 28/02/11 FYI - I'm running libvirt-0.8.3 (the Ubuntu package recompiled with the ESX flag enabled). When I put virsh into debug mode it returns this: [snip] Enter root's password for 10.51.4.11: 15:19:09.011: debug : do_open:1249 : driver 3 ESX returned ERROR 15:19:09.011: debug : virUnrefConnect:294 : unref connection 0x98aa8f8 1 15:19:09.011: debug : virReleaseConnect:249 : release connection 0x98aa8f8 error: internal error HTTP response code 400 for call to 'Login' error: failed to connect to the hypervisor

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• apache tomcat loadbalancing clustering on ubuntu

  - by user740010

  i am facing a problem in clustering the tomcat with apache as a loadbalancer using mod_jk on ubuntu. i have install apache2 on my ubuntu 11.04 and i have downloaded tomcat7 created two copies and kept them at two different location. 1st one is at /home/net4u/vishal/test/tomcatA 2nd one is at /home/net4u/vishal/test1/tomcatB i have made following changes to server.xml file in /conf folder 1. <Server port="8205" shutdown="SHUTDOWN"> 2. <Connector port="8280" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> 3.<Connector port="8209" protocol="AJP/1.3" redirectPort="8443" /> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcatB"> 4. <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> similarly i have modified other tomcat i.e tomcatA server.xml content of the server.xml is as follow: -- <!--The connectors can use a shared executor, you can define one or more named thread pools--> <!-- <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" maxThreads="150" minSpareThreads="4"/> --> <!-- A "Connector" represents an endpoint by which requests are received and responses are returned. Documentation at : Java HTTP Connector: /docs/config/http.html (blocking & non-blocking) Java AJP Connector: /docs/config/ajp.html APR (HTTP/AJP) Connector: /docs/apr.html Define a non-SSL HTTP/1.1 Connector on port 8080 --> <Connector port="8280" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <!-- A "Connector" using the shared thread pool--> <!-- <Connector executor="tomcatThreadPool" port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> --> <!-- Define a SSL HTTP/1.1 Connector on port 8443 This connector uses the JSSE configuration, when using APR, the connector should be using the OpenSSL style configuration described in the APR documentation --> <!-- <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" clientAuth="false" sslProtocol="TLS" /> --> <!-- Define an AJP 1.3 Connector on port 8009 --> <Connector port="8109" protocol="AJP/1.3" redirectPort="8443" /> <!-- An Engine represents the entry point (within Catalina) that processes every request. The Engine implementation for Tomcat stand alone analyzes the HTTP headers included with the request, and passes them on to the appropriate Host (virtual host). Documentation at /docs/config/engine.html --> <!-- You should set jvmRoute to support load-balancing via AJP ie : <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> --> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcatB"> <!--For clustering, please take a look at documentation at: /docs/cluster-howto.html (simple how to) /docs/config/cluster.html (reference documentation) --> <!-- uncomment for clustering--> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> <!-- Use the LockOutRealm to prevent attempts to guess user passwords via a brute-force attack --> <Realm className="org.apache.catalina.realm.LockOutRealm"> <!-- This Realm uses the UserDatabase configured in the global JNDI resources under the key "UserDatabase". Any edits that are performed against this UserDatabase are immediately available for use by the Realm. --> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> </Realm> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true"> <!-- SingleSignOn valve, share authentication between web applications Documentation at: /docs/config/valve.html --> <!-- <Valve className="org.apache.catalina.authenticator.SingleSignOn" /> --> <!-- Access log processes all example. Documentation at: /docs/config/valve.html Note: The pattern used is equivalent to using pattern="common" --> <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" resolveHosts="false"/> </Host> </Engine> i have install libapache2-mod-jk step 1. i have Created jk.load file in /etc/apache2/mods-enabled/jk.load content is as follows: LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so Create /etc/apache2/mods-enabled/jk.conf: JkWorkersFile /etc/apache2/workers.properties JkLogFile /var/log/apache2/jk.log JkMount /ecommerce/* worker1 JkMount /images/* worker1 JkMount /content/* worker1 step 2. Created workers.properties file in /etc/apache2/workers.properties content is as follows: workers.tomcat_home=/home/vishal/Desktop/test/tomcatA workers.java_home=/usr/lib/jvm/default-java ps=/ worker.list=tomcatA,tomcatB,loadbalancer   worker.tomcatA.port=8109 worker.tomcatA.host=localhost worker.tomcatA.type=ajp13 worker.tomcatA.lbfactor=1   worker.tomcatB.port=8209 worker.tomcatB.host=localhost worker.tomcatB.type=ajp13 worker.tomcatB.lbfactor=1 worker.loadbalancer.type=lb worker.loadbalancer.balanced_workers=tomcatA,tomcatB worker.loadbalancer.sticky_session=1 i tried the same thing on the windows machine it is working.

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• Horrible performing RAID

  - by Philip

  I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a RAID10 using MegaRAID SAS 9280-4i4e with this configuration: http://pastebin.com/2xj4401J Connected to this cluster are a few other servers with the native client running nginx to serve files stored on it in the order of 3-10MB. Right now a storage server has a outgoing bandwith of 300Mbit/s and the busy rate of the raid array is at 30-40%. There are also strange side-effects: Sometimes the io-latency skyrockets and there is no access possible on the raid for 10 seconds. The file system used is xfs and it has been tuned to match the raid stripe size. Does anyone have an idea what could be the reason for such a bad performing array? 22 Disks in a RAID10 should deliver way more throughput.

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• VMware Virtual vCenter and High Availability

  - by rufo

  To continue with this question: Should be Vmware vCenter server high available? According to the response there even if vCenter is down HA will continue to work. So, if my vCenter is a VM, using the express sql edition in the same VM, and that VM is hosted in the same cluster it manages (and the cluster is setup for HA): Am I correct to assume that if the host that hosts the vCenter goes down HA will vmotion the vCenter VM to another host and it will continue to function? BTW: my environment is small, two ESXi 5.0 hosts, with about 50 VMs, using iSCSI shared storaged for everything.

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• (Ubuntu - Lamp) phpmyadmin install error 404 not found

  - by meyosef

  Hi, I install apache, mysql, php and then phpmyadmin on ubuntu desktop 10.04 version I test apache: localhost with browser and its works. I test mysql with console and its works. I test phpmyadmin http://localhost/phpmyadmin/ and get error 404 not found I see that solution for that brobem, copy /phpmyadmin/ to /www/, but I dont want to put in /www/ to my websites files (maybe I wrong or miss something-please tell me in this case). How this problem can be solved in the best way? Thanks

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• How do I remove Slony from a restored PostgreSQL database?

  - by Scott Herbert

  I've restored a database which came from a server on which Slony was running. The server on which the database has been restored does not have Slony installed. When the database restored, there were a lot of errors reported, with Slony related objects not getting created due to Slony related logins being missing. This I thought was not a problem, as losing the Slony objects didn't seem to matter, and infact seemed desirable. However, now I've got an anoying, if not critical problem. Whenever one clicks on a table in the newly restored DB in PGAdmin, a Slony related error popup ... pops up. The first one reads: "An error has occured: ERROR: function _rmscl.getlocalnodeid(unknown) does not exist" I notice that under the Replication node in PGAdmin, that there is a Slony replication cluster. Trying to drop this cluster results in more object missing type errors. Does anyone have any ideas how we can remove the last vestiges of Slony from this database?

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• NLB RPC server is unavailable on the specified computer

  - by Robin Weston

  Hi guys, Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server 2008 Web Servers. Neither of the machines are members of a domain, and both have 2 NICs (one for processing external web traffic, and one for communicating internally). I have installed NLB on both machines, and have created a cluster on Host A and added itself to it. However, when I try and add Host B (using the address from the external NIC) I get the following error : "The RPC server is unavailable on the specified computer". On Host B I can see that the RPC service is running fine. I can also ping and RDP from Host A to Host B with no problems either. I have disabled the windows firewall on both machines but that had no effect

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• How to find date/time used by Cassandra

  - by JDI Lloyd

  Earlier this morning I noticed that one of the nodes in our Cassandra cluster is writing logs an hour in the future, despite the date/time being correct on the OS. A couple of other nodes I checked via logs appear to be writing logs at the correct time. I now need to go through and check each node in our 80 node cluster and ensure cassandra is running on the correct time, problem being is some of the nodes don't write to the logs very often as they aren't doing much... the question is, is there some form of tool/utility (ie nodetool) that can tell me the time that cassandra is running on? All the systems date/times are correct, ntpdate cron in place has been for a while. Servers are set to Belize timezone to avoid DST changes so its nothing to do with that.

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• Normalize Accept-Encoding via HAProxy for optimized Squid hit rate

  - by Matt Beckman

  Our website infrastructure uses HAProxy for load balancing, a Squid cluster for caching, and application data is on an IIS cluster. We load balance HAProxy by URI to optimize the Squid hit-rate, but we know that Squid is holding different copies of each page based on the Accept-Encoding header passed to it by the browser, and so IE (gzip, deflate) will have a different copy of a cached page than Firefox (gzip,deflate) or Chrome (gzip,deflate,sdch). We want to normalize the Accept-Encoding headers and I think the best place to do so would be in HAProxy. I'd appreciate it if someone could offer some ideas on how to accomplish this without breaking support for clients without gzip or deflate support.

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• sectors and clusters

  - by Phenom

  Are the sectors in a cluster all next to each other?

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