Posts

Installing Ubuntu 14.04 LTS with Cacti 0.8.8c

Ubuntu provides only Cacti 0.8.8b so we need to compile our own package with 0.8.8c after installing OS.

Virtualizing old Centos 5 server with software RAID disks

VMware Converter does decent job converting old physical servers to virtual machines, but it refuses to do anything to servers using software RAID. I really don't get why such arbitary limitation is in place. It really doesn't matter if physical server used RAID, software or not, because everything is copied by Converter on file lever rather than block level.

Remapping bad sectors with Linux and dd

I have one faulty non-RAID disk on server which I can't replace right now so I wanted to see if I could mask problems by manually triggering bad sector reallocation.

Using Sonera 6rd IPv6 with Cisco IOS router

Sonera recently started offering 6rd tunnels to their customers in Finland. Based on this Comcast example it was easy to get Sonera 6rd up with Cisco 892 running IOS 15.5(1)T.

Prefer IPv4 over IPv6 on CentOS 6

To prefer IPv4 (A) addresses over IPv6 (AAAA) on CentOS 6 you need to add new file named /etc/gai.conf with following content. Last line is what controls if IPv4 or IPv6 should be tried first.

Enable UserDir with Centos 6 and SELinux

I had unfortunate opportunity to play with RedHat / Fedora / CentOS distribution today. I have to say that as much as I hate Ubuntu, CentOS is even worse than it was few years ago when CentOS5 was still current. And now we're ignoring RHEL7 / CentOS7 where headless server installer requires GUI that's optimized for touch screen and tries to imitate Ipad. Recommended solution? Use VNC to connect installer. Aargh! I should probably have Ipad to run that VNC client - for improved user experience you know.

Remote conversion of 64-bit CentOS 6.5 to 64-bit Ubuntu 14.04

For 32-bit source to 64-bit see my older post . Old install was using software RAID-1, but did not have LVM. Small 200MB /boot partition, 8GB swap and rest as one root partition. We're redoing it completely so what it used to be doesn't really matter. All existing data on root will be lost.