Contrary to most posts online that say you can only boot from a partition on RAID1, not RAID10, after setting up both partitions on RAID10, I was able to boot just fine. There may be a difference between RAID10 in an n=2 (2 [...]]]> http://thern.org/linux-and-freebsd/linux-desktop-or-server-with-md-raid-10/feed/ 0 http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/ http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/#comments Sat, 03 Apr 2010 00:45:34 +0000 Eric Thern http://thern.org/?p=201 Migrating servers to new datacenters or IP addresses is never entirely problem free, usually due to many DNS servers on the internet not obeying TTL’s or caching old records for way too long.

These old cached DNS records (usually at different ISP’s, major mailservers like google, hotmail, yahoo, etc.) cause problems where they’ll route mail [...]]]> http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/feed/ 0 http://thern.org/linux-and-freebsd/yum-update-check-script-runs-via-crontab-and-emails-when-new-updates-are-available/ http://thern.org/linux-and-freebsd/yum-update-check-script-runs-via-crontab-and-emails-when-new-updates-are-available/#comments Fri, 19 Feb 2010 05:03:32 +0000 Eric Thern http://thern.org/eric/?p=160 Here’s a quick script that will check yum updates and email you when there are new updates available.

Split into two sections, one script is for all package updates, and the other script is for letting us know if we need to reboot when a new kernel package has been installed.

Script to check for [...]]]> http://thern.org/linux-and-freebsd/yum-update-check-script-runs-via-crontab-and-emails-when-new-updates-are-available/feed/ 0 http://thern.org/linux-and-freebsd/logrotate-tweaks-to-enhance-rsync-backups/ http://thern.org/linux-and-freebsd/logrotate-tweaks-to-enhance-rsync-backups/#comments Sun, 22 Nov 2009 08:19:55 +0000 Eric Thern http://thern.org/eric/?p=109 logrotate, by default (at least on CentOS as of 3, 4, and 5.x), rotates logs by incrementing all numbers on previous logs by one, and moving the current log to log.0

This is all fine and good if you like your logs to all be rotated in order, and have a certain number backed up:

(For Redhat/Centos – updated from the MailScanner documentation)
1) Make a backup copy of your current MailScanner (Linux):

cp -a /etc/MailScanner /etc/MailScanner.$(date +%Y%m%d)
cp -a /usr/lib/MailScanner /usr/lib/MailScanner.$(date +%Y%m%d)
cp -a /usr/sbin/MailScanner /usr/sbin/MailScanner.$(date +%Y%m%d)

2) Download the latest version and extract

http://mailscanner.info/downloads.html

Check [...]]]> http://thern.org/linux-and-freebsd/upgrading-mailscanner/feed/ 0