[debian-edu-commits] [Debian Wiki] Update of "DebianEdu/Documentation/Buster/Upgrades" by HolgerLevsen

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The "DebianEdu/Documentation/Buster/Upgrades" page has been changed by HolgerLevsen:
https://wiki.debian.org/DebianEdu/Documentation/Buster/Upgrades

Comment:
copied+derived from https://wiki.debian.org/DebianEdu/Documentation/Stretch (and cleaned some stuff)

New page:
= Upgrades =

<<TableOfContents(3)>>

/!\ Before reading this upgrade guide, please note that live updates to your production servers are carried out at your own risk. '''Debian Edu/Skolelinux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.''' 

Please read this chapter and the [[../Features|New features in Buster|]] chapter of this manual completely before attempting to upgrade.

== General notes on upgrading ==

Upgrading Debian from one distribution to the next is generally rather easy. For Debian Edu this is unfortunately not yet true as we modify configuration files in ways we shouldn't. (See Debian bug DebianBug:311188 for more information.) Upgrading is still possible but may require some work. 

In general, upgrading the servers is more difficult than the workstations and the main-server is the most difficult to upgrade. The diskless machines are easy, as their chroot environment can be deleted and recreated, if you haven't modified it. If you have, the chroot is basically a workstation chroot anyway, so rather easy to upgrade.

If you want to be sure that after the upgrade everything works as before, you should test the upgrade on a test system or systems configured the same way as your production machines. There you can test the upgrade without risk and see if everything works as it should.

Make sure to also read the information about the current Debian Stable release in its [[http://www.debian.org/releases/stable/installmanual|installation manual]].

It may also be wise to wait a bit and keep running Oldstable for a few weeks longer, so that others can test the upgrade and document any problems they experience. The Oldstable release of Debian Edu will receive continued support for some time after the next Stable release, but when Debian [[http://www.debian.org/security/faq#lifespan|ceases support for Oldstable]], Debian Edu will necessarily do the same.

== Upgrades from Debian Edu Jessie ==

/!\ Be prepared: make sure you have tested the upgrade from Jessie in a test environment or have backups ready to be able to go back. 

Please note that the following recipe applies to a default Debian Edu main server installation (desktop=kde, profiles Main Server, Workstation, LTSP Server). (For a general overview concerning stretch to buster upgrade, see:
https://www.debian.org/releases/buster/releasenotes)

Don't use X, use a virtual console, log in as root.

Please note one difference between {{{apt}}} and {{{apt-get}}} in Stretch:
By default {{{apt-get}}} keeps downloaded packages, {{{apt}}} removes them from the cache (after successful installation).

If {{{apt}}} finishes with an error, try to fix it and/or run {{{apt -f install}}} and then {{{apt -y full-upgrade}}} once again.

=== Upgrading the main server ===

 * Start by making sure the current system is up-to-date:
{{{
apt update
apt full-upgrade
}}}

 * Cleanup the package cache:
{{{
apt-get clean
}}}

 * Prepare and start the upgrade to Buster:
{{{
# First, adjust for a changed profile name:
sed -i 's/Thin-Client-Server/LTSP-Server/' /etc/debian-edu/config
# Then it's best to use the new default mirror:
sed -i 's/http.debian.net/deb.debian.org/g' /etc/apt/sources.list
# Finally, replace stretch with buster.
sed -i 's/stretch/buster/g' /etc/apt/sources.list
apt update
apt full-upgrade
}}}	

 * apt-list-changes: be prepared for a lot of NEWS to read; press <return> to scroll down, <q> to leave the pager.

 * Read all debconf information carefully, choose 'keep your currently-installed version' unless stated differently below; in most cases hitting return will be fine.

 * You will see some prompts about package configurations:
  * FIXME: list promps about package configuration here.

 * Get the new Debian Edu Buster artwork:
{{{
apt install debian-edu-artwork-softwaves
}}}	


 * After reboot, do some more cleanup:
{{{
apt purge linux-image-3.16.0-4-amd64   # FIXME: adjust kernel version
}}}	

 * Check if the upgraded system works:

Reboot; log in as first user and test

 * if the GOsa² gui is working,
 * if one is able to connect LTSP clients and workstations,
 * if one can add/remove a netgroup membership of a system,
 * if one can send and receive internal email,
 * if one can manage printers,
 * and if other site specific things are working.

=== Upgrading a workstation ===

Do all the basic things like on the main-server and without doing the things not needed. And then do this in addition.

 * To enable LDAP connection, renew the server certificate: FIXME: check if needed
{{{
rm /etc/ldap/ssl/ldap-server-pubkey.pem
service nslcd stop
service fetch-ldap-cert restart
service nslcd start
}}} 

=== Upgrading LTSP chroots (default arch i386) ===

Make sure you have enough disk space. LTSP now uses Network Block Device (NBD).
The NBD image file size is about 4 GiB (default installation). If the image is updated, another 4 GiB for a temporary file are needed.

{{{
ltsp-chroot -m -a i386 apt update
ltsp-chroot -m -a i386 apt -y full-upgrade
sed -i 's/stretch/buster/g' /opt/ltsp/i386/etc/apt/sources.list
ltsp-chroot -m -a i386 apt update
ltsp-chroot -m -a i386 apt -y full-upgrade
ltsp-chroot -m -a i386 apt -f install
ltsp-chroot -m -a i386 apt -y full-upgrade
}}}

 * Cleaning up:

{{{
ltsp-chroot -m -a i386 apt --purge autoremove
}}}

 * Update LTSP support on the server side:

{{{
ltsp-update-kernels
ltsp-update-sshkeys
ltsp-update-image
}}}

To save disk space, {{{ltsp-update-image -n}}} could be used instead; see {{{man ltsp-update-image}}}. 

=== Recreating an LTSP chroot ===

On the LTSP server(s) the LTSP chroot could also be recreated. The new chroot will still  support both thin-clients and diskless workstations.

Remove {{{/opt/ltsp/i386}}} (or {{{/opt/ltsp/amd64}}}, depending on your setup). If you have enough diskspace, consider backing it up. 

Recreate the chroot by running {{{debian-edu-ltsp --arch i386}}} (or {{{debian-edu-ltsp --arch amd64}}}) as root. 

== Upgrades from older Debian Edu / Skolelinux installations (before Stretch) ==

To upgrade from any older release, you will need to upgrade to the Stretch based Debian Edu release first, before you can follow the instructions provided above. Instructions are given in the [[DebianEdu/Documentation/Stretch|Manual for Debian Edu Stretch]] about how to upgrade to Stretch from the previous release, Jessie. Likewise the Jessie manual describes how to upgrade from Wheezy.

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