Upgrading Rackspace OnMetal Trusty to Xenial

om-trusty-xenial-upgrade.md

Upgrading a Rackspace OnMetal server from Trusty (14.04) to Xenial (16.04)

First Steps

1. Run apt-get update
2. Run apt-get dist-upgrade
3. Reboot if needed (new kernel, etc...)
4. Run apt-get update again
5. Run apt-get autoremove
6. Ensure that update-manager is set to receive lts upgrades
   • Edit /etc/update-manager/release-upgrades
   • Ensure that Prompt=lts is set
7. Install and start tmux
8. Run do-release-upgrade

Running do-release-upgrade

1. Enter y for all of the the continue prompts, and the No valid mirror prompt
2. Say Yes to the restart services prompt
3. Keep your currently-installed version for /etc/default/rc5 by entering N
4. Keep your currently-installed version of /etc/default/grub
5. Keep your currently-installed version of /etc/apt.conf.d/50-unattended-upgrades
6. Continue y on the package removal step
7. Allow the upgrade to reboot the box

Bringing the box back from the brink

1. Start a ping to your OnMetal server
2. From mycloud.rackspace.com or from nova issue a hard reboot
3. In a few minutes you should see echo replies
   • This will probably take 500-600 echo requests
   • If it takes more than 750 you can issue another hard reboot
4. SSH back into your box
5. Remove the file /etc/apt/apt.conf.d/50unattended-upgrades.ucf-dist
6. Update packages with apt update
7. Look for held packages with dpkg --get-selections | grep hold
8. Unhold any packages that were held back

   for package in $(dpkg --get-selections | grep hold | awk '{ print $1 }');
     do apt-mark unhold $package;
   done

9. Update packages again apt update
10. Run apt dist-upgrade
11. Choose the package maintainers version for /etc/cloud/cloud.cfg.d
12. Run apt autoremove
13. Run apt clean

Congratulations, you now have a functional Xenial (16.04) LTS OnMetal server