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VM Optimizations

Created by dave. Last edited by dave, 4 years and 333 days ago. Viewed 1,399 times. #5
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CentOS-6.4-x86_64-minimal.cfg (2611)
(2014-01-14)

This is all heavily based on >>The Lone Sysadmin and I can't really claim credit for any of it.

Elevator

Add to /etc/grub.conf kernel line(s):

elevator=noop

Disk Mounts

Add to each file system mount from "local" disks:

defaults,relatime

(Note: RH6 and C6 do this automatically in "defaults")

Swappiness

# echo vm.swappiness=0 >> /etc/sysctl.conf
# sysctl -p

Example Minimal ks.cfg

Attached

Notes:

  • change your mount point for source files
  • change the password hash
  • this only has a 1GB swap file; if you anticipating needing more swap then you'll have to change it (read why here: Swap Size)
  • this includes the "elevator=noop" option
  • this includes the "relatime" option
  • this includes the "auto-RAID" logic that will automatically RAID-1 the first two disks if they look identical; while this should never be used on VMs, we use this ks.cfg for kicking real systems and this keeps the logic intact
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This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.

Useful:


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