When monitoring the performance of your Apache web server, you should use system level tools such as top, vmstat, free, netstat and so on. In addition, Apache it’s self has a nice feature called “server-status” which allows you to monitor the Apache performance via a web browser. A screen shot
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Update OpenSSL on Ubuntu for the HeartBleed bug
On Ubuntu, issue the following commands to update the lest possible packages while patching the Heartbleed bug. apt-get update apt-get install openssl libssl1.0.0 And then restart any services that need it.
Read moreCreate your own Munin Plugin on Redhat/CentOS
This article explains how to create your own munin plugin. We will monitor the number of Apache and/or Nginx processors running. On the munin-node (client), create a file as “/usr/share/munin/plugins/webserver-count” and put the following content into it: #!/bin/sh case $1 in config) cat <<‘EOM’ graph_title Webserver Count graph_vlabel load
Read moreInstall Memcached for Magento (or any PHP site) on CentOS/Redhat
This article explains how to install and configure memcached for Magento (or any PHP site) on a Redhat or CentOS server. Install memcached: yum install memcached php-pecl-memcache -y Now edit your “/etc/sysconfig/memcached” file to look something like this: PORT=”11211″ USER=”memcached” MAXCONN=”1024″ CACHESIZE=”256″ ## Accept connections from another server (192.168.1.2)? #OPTIONS=”-l
Read moreEnabling Triggers within RDS (Amazon)
By default, Amazon’s AWS RDS databases don’t permit Triggers. This article explains how to change that. Source: “http://techtavern.wordpress.com/2013/06/17/mysql-triggers-and-amazon-rds/”. Open the RDS web console. Open the “Parameter Groups” tab. Create a new Parameter Group. On the dialog, select the MySQL family compatible to your MySQL database version, give it a name
Read moreInstall Composer on CentOS/Redhat
This article explains how to install Composer on a CentOS and Redhat system. curl -sS https://getcomposer.org/installer | php You should get something like this in return. Note that i have an old version of PHP on this system so it warns me about it: [root@server ~]# cd ~ [root@server ~]#
Read moreUse a ‘dd’ image as a disk for a VirtualBox guest
This article explains how to use a ‘dd’ image as the disk for a VirtualBox guest machine. The process is one step; convert the ‘dd’ image to ‘VDI’ format as i’ve done in the example below: VBoxManage convertdd dd-image.raw sda.vdi –format VDI –variant Fixed The above command will leave the
Read moreFix Munin Graphs – When they wont update
This article explains how to fix Munin graphs that wont update or have stopped updating. The official FAQ (http://munin-monitoring.org/wiki/faq#Q.Thegraphsarenotupdatinganymore) doesn’t really say much about it. So do this: More info: This is an interesting article related to the issue. “http://grokbase.com/t/sf/munin-users/1166b12gsk/increase-in-period-for-munin-cron-or-munin-update-results-no-graphs”. First, disable munin cron task: mv /etc/cron.d/munin ~/munin.cron Wait until
Read moreGet MySQL Database Sizes
Log into MySQL and issue the following command as it is: SELECT table_schema AS “Database name”, SUM(data_length + index_length) / 1024 / 1024 AS “Size (MB)” FROM information_schema.TABLES GROUP BY table_schema; And you’ll get something like the following: +——————–+————–+ | Database name | Size (MB) | +——————–+————–+ | my_db1 |
Read moreEncrypt Large Files With OpenSSL Using Public/Private Keys
This article explains how to encrypt large files with OpenSSL and Public/Private keys. Create your key-pair: openssl req -x509 -nodes -newkey rsa:2048 -keyout private.pem -out public_nopass.pem Encrypt your larger file: openssl smime -encrypt -aes256 -in bigfile.tar -binary -outform DEM -out bigfile.tar.ssl public.pem Decrypt your file: openssl smime -decrypt -in bigfile.tar.ssl
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