Updated about 10 hours ago by Hannah Siwiec

• Table of contents
• Debian 11 to 12
  • Pre update check
    • Check / Take Backups
    • Stretch check
    • Metapackage check
    • Purged package check
    • Hold check
    • Update sources list
  • Upgrade the system
    • Update the sources
    • Check for Necessary Disk Space
    • Minimal Upgrade
    • Full Upgrade
    • Upgrade MySQL databases (if MySQL/MariaDB installed)
  • Validation Testing and Auditing Changes
    • Check what packages were removed
  • Common problems
    • NO_PUBKEY during update
    • Backupninja changes

Debian 11 to 12¶

Pre update check¶

Check / Take Backups¶

1. Check that the most recent backupninja backup jobs have run successfully
2. Check that the most recent backup is valid and can be used for recovery

If the server is running on linode, check that image based backups are enabled / working. Take a snapshot before running the upgrade procedure!

Stretch check¶

Check if any sources still point to buster

cd /etc/apt
grep -nr buster .

If so, bring those up to bullseye and run updates first
https://redmine.palantetech.coop/projects/commons/wiki/Debian_10_to_11

Metapackage check¶

Check to make sure kernel metapackage is installed, not just specific kernel

dpkg -l "linux-image*" | grep ^ii | grep -i meta

should have results

If not, install metapackage
https://www.debian.org/releases/bookworm/amd64/release-notes/ch-upgrading.en.html#kernel-metapackage

Purged package check¶

List and purge removed packages with config files remaining
https://www.debian.org/releases/bookworm/amd64/release-notes/ch-upgrading.en.html#purge-removed-packages

aptitude search '~c'
aptitude purge '~c'

Hold check¶

These commands should have no results

aptitude search "~ahold" 
dpkg --get-selections | grep 'hold$'

Update sources list¶

Check which sources exist that point to bullseye

cd /etc/apt
grep -nr bullseye .

Edit the main list, and any others that come up

vim /etc/apt/sources.list

replace bullseye with bookworm

:%s/bullseye/bookworm/g

Good to check but should be done if upgraded from Debian 10 to 11
replace bullseye/updates with bookworm-security

:%s/bookworm\/updates/bookworm-security/g

https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.html#security-archive

Upgrade the system¶

Update the sources¶

apt-get update

Check for Necessary Disk Space¶

apt-get -o APT::Get::Trivial-Only=true dist-upgrade

Minimal Upgrade¶

 apt-get upgrade

if it asks whether to change /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg, say yes
other things it asks to change, say no, keep the existing file

Full Upgrade¶

apt-get dist-upgrade

Change configs during full upgrade (install the package maintainers version)

package	change configs
nrpe	no
sudoers	no
journald	no
backupninja	no
nginx	yes but recheck after
redis	yes but recheck after
sshd_config	yes but recheck after
glibc	yes
logrotate.d/apache2	yes

Upgrade MySQL databases (if MySQL/MariaDB installed)¶

mysql_upgrade

Validation Testing and Auditing Changes¶

if a web server, make sure websites are up
    if an infrastructure server, test and make sure all parts of the infrastructure are working properly
    if a PTC server check the recovery plan entry for that server to make sure everything has recovered

Check what packages were removed¶

    cat /var/log/apt/history.log | grep Remove

copy that into ongoing updates documentation for records
Make sure there was nothing important in there
If there were important packages in there

• check aptitude to see if newer versions were already installed
• check debian package search to search for what version is appropriate (https://packages.debian.org/)

Common problems¶

NO_PUBKEY during update¶

When issues are encountered they should be listed here to ease future troubleshooting!

Backupninja changes¶

After update, backupninja likely needs to be patched
https://redmine.palantetech.coop/projects/pt/wiki/Icinga2#Patch-the-backupninja-binary

Borg backup jobs to May First need to have port = 2201 added to the destination section.