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Category Archives: Linux Guides
MyISAM Repair all MySQL Databases & Tables
So you’ve probably not made the switch to InnoDB or XtraDB yet, shame on you! But tonight your server crashed, ran out of disk space or otherwise corrupted all of your active tables across various databases. Ouch! How are we … Continue reading
suPHP on CentOS 6 from Source Code
So you’ve decided that you must run php as suPHP on your CentOS 6 based LAMP stack. This is a great idea for security on a multi-site or multi-user environment. Of course management panels like cPanel make running suPHP very … Continue reading
Posted in Linux Guides
Tagged centos 6, fastcgi, lamp, mod_suphp, mod_suphp.so, php, php.conf, security, source code, suphp, suphp-0.7.1, suphp.conf
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CRON ERROR: failed to open PAM security session: Protocol not supported
Got an interesting report of an error on one of our servers. I was told crons for a user account on our server weren’t running. I tailed the cron log (/var/log/cron) and came to find these errors:
Posted in Linux Guides
Tagged cron error, crond, crons, hard limit, limits.conf, linux, maxlogins, pam, security, ulimit, ulimits
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ZFS on Linux RC10 released!
The ZFS on linux team has released a new version of SPL and ZFS with multiple benefits to users. The new version is 0.6.0-rc10 and our guide found here is being updated now: Installing ZFS RAID-Z on CentOS 6.2 with … Continue reading
Posted in Linux Guides
Tagged linux zfs, new zfs released, spl, zfs, zfs 0.6.0-rc10, zfs on centos, zfs on linux
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Pick random line from text file with bash and shuf.
So lets say you have a text file called list.txt with entries like: What if you wanted to pick a random entry? The easiest solution is to use the ‘shuf’ tool, which is standard on CentOS as part of coreutils. … Continue reading
Posted in Bash One-Liners, Linux Guides
Tagged bash, coreutils, linux, random, random line, shuf, text lists, text manipulation
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New ZFS on Linux release (RC9).
We have one of the most comprehensive guides on the internet for ZFS. Please check the updated guide for assistance with installing ZFS on Linux, specifically CentOS 6.2 here: Installing ZFS RAID-Z on CentOS 6.2 with SSD Caching
Posted in Linux Guides
Tagged updated guide, zfs, zfs on centos, zfs on linux, zfs rc9
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No module named cElementTree yum update error
Found yum broken on a legacy CentOS 5.x server while installing updates. The error was: root # yum update There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: … Continue reading
Posted in Linux Guides
Tagged cElementTree, centos, centos updates, python, python-elementtree, yum, yum updates
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Installing ZFS RAID-Z on CentOS 6.2 with SSD caching.
Updated August 16th, 2012 I recently had a project that required data storage with deduplication, data integrity assurance, and hardware fault tolerance. Instead of going with a traditional hardware RAID solution I opted to test out ZFS. My configuration utilized … Continue reading
Posted in Linux Guides
Tagged atime, centos 6.2, compression, data compression, data integrity, deduplication, disable atime zfs, fault tolerance, raid alternative, raid-5, raid-z, spl, ssd caching, zfs, zfs on centos, zfs on linux, zfs raid-z, zpool
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KVM Hardware Virtualization on CentOS 6.2 Dedicated Servers
I wrote this guide to show you how to do a proper KVM setup on your CentOS dedicated server. We will be using VNC and connecting to the dedicated server remotely from your workstation. I realize there are a lot … Continue reading