http://gnusys.net GNU/LINUX System Administration notes Thu, 21 Aug 2008 03:58:12 +0000 http://backend.userland.com/rss092 en Please follow the following commands to install yum on your Virtuozzo container . The follwoing commands are to be run from the hardware node . ------------------------ [root@vps1 ~]# vzlist  -a CTID      NPROC STATUS    IP_ADDR         HOSTNAME 1         91 running   192.168.46.242  ServiceCT 105         49 running   69.72.234.148   asdf 107         49 running   69.72.234.150   test.test.com2 ------------------------ This will list all the configured containers ... http://gnusys.net/howto-install-yum-on-a-virtuozzo-container/ Nginx is a very fast ,powerful asynchronous web server that can be considered as a good replacement for the Apache HTTPD web server. Below are the steps required to get Nginx installed on your system. It is preffered to install Nginx from source as we get the latest stable version ... http://gnusys.net/howto-install-nginx-from-source/ A PHP FastCGI Process manager can be a used to spawn php fastcgi server instances when you have configured your web server to pass php scripts to a FastCGI server .This can be used with web servers like Nginx and lighthttpd . Download the patch file for your php version from ... http://gnusys.net/howto-install-php-fpm-php-fastcgi-process-manager/ Consider the scenario :- SSH service in your server ( CPanel ) has falied and its not allowing you to login from backend. But you can login to WHM with any issues. Trying to restart SSH using WHM > Restart Services also is giving a "Failed" result . or You have changed ... http://gnusys.net/ssh-service-failed-and-you-cant-start-it-using-cpanel/ This information will be useful in finding out the particular rpm that you have to download when the rpms made for all architectures are available from public repos like rpmind.net , rpm.pbone.net etc Run the following command ===== uname -m or /bin/arch ==== http://gnusys.net/find-machine-architecture-of-a-linux-system/ You may sometimes encounter the following problem while starting apache server ==== [root@epsilon root]# /etc/init.d/httpd start Starting httpd: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:443 no listening sockets available, shutting down Unable to open logs [FAILED] ==== To fix this run the following commands fuser -k -n tcp 443 http://gnusys.net/apache-startup-fail/ gnusys.net has changed its webserver to the Russian legend nginx (pronounced engineX ) I have also added APC for caching the php bytecode ( APC is used by Yahoo Inc ,Wikipedia.org etc among others). I will post the configuration shortly over here...  What i liked more about nginx is its simple ... http://gnusys.net/gnusys-is-now-powered-by-nginx/ Imagine your domain has ROR ( Ruby On Rails ) installed and it connects on port 1200 eg :- http://gnusys.net:1200 and you want to change the way it appears on the address bar as simply http://gnusys.net. Normally Apache won't allow this as it is configured to work on port 80 ... http://gnusys.net/apache-mod_proxy/ Semaphore, it is a lot like a locking mechanism. In any server there is an order of precedence in which tasks must be accomplished. The semaphore is used to maintain that precedence order; more to the point, the precedence order is maintained by the semaphores. A succeeding task may not ... http://gnusys.net/semaphore-arrays/ Scenario:- Add Application icon missing or grayed out "Add New Application" icon can be missing if "Hide all greyed out buttons by default" is enabled on the Server -> Interface management page in Plesk CP. "Add New Application" can be greyed out if some application is already installed in the domains' DocumentRoot ... http://gnusys.net/control-panel-icons-missing/