= Upgrade des Debian Edu Haupt-Servers (TJENER) von Debian Edu squeeze nach Debian Edu jessie =

== Package Upgrades ==

=== to Debian (Edu) wheezy ===

  * Update {{{/etc/apt/sources.list}}} and individual configurations in {{{/etc/apt/sources.list.d/}}}, so that packages for Debian wheezy will get installed with next upgrade / dist-upgrade.
  * Run upgrade and dist-upgrade in two steps{{{
root@tjener:~# apt-get upgrade
root@tjener:~# apt-get dist-upgrade
}}}

  * Reboot into the new Debian wheezy system, ignore if some services are broken / non-functional.

=== to Debian (Edu) jessie ===

  * Update {{{/etc/apt/sources.list}}} and individual configurations in {{{/etc/apt/sources.list.d/}}}, so that packages for Debian jessie will get installed with next upgrade / dist-upgrade.
  * Run upgrade and dist-upgrade in two steps{{{
root@tjener:~# apt-get upgrade
root@tjener:~# apt-get dist-upgrade
}}}

  * Reboot into the new Debian jessie system, ignore if some services are broken / non-functional.

=== Possible mistakes ===

  * Don't forget the reboot into the Debian wheezy system, because you will run into troubles when upgrading the {{{udev}}} package from wheezy to jessie.

== Fixing the TJENER setup after package upgrade ==

The Debian Edu mainserver is not easily upgradable, because the mainserver installation process in Debian Edu does many modifications to the plain Debian system.

=== Fix DNS server (bind9) ===

During the upgrade process, the DNS server configuration (synced into text files from LDAP) gets lost. You need to rebuild the DNS server configuration files from LDAP manually.

  * Add{{{
10.0.2.2 ldap.intern}}}to /etc/hosts temporarily.
  * Add{{{
BIND_DATA="/etc/bind"}}}at the end of {{{/etc/default/ldap2zone}}}.
  * Rebuild the DNS configuration (in {{{/etc/bind}}}) via {{{ldap2bind}}} command:{{{
root@tjener:~# su - bind
bind@tjener:~$ PATH=/sbin:/bin:/usr/sbin:/usr/bin /usr/sbin/ldap2bind