Antoine R. Dumont
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+
+   sysadm staff members
+
+Purpose
+--------
+
+This page documents the steps to upgrade Debian nodes running in a Rancher cluster. The
+upgrade process involves various commands and checks before and after rebooting the
+node.
+
+Prerequisites
+-------------
+
+ Familiarity with SSH and CLI-based command execution
+ Out-of-band Access to the node (IDRAC/ILO) for reboot
+ Access to the node through SSH (requires the vpn)
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+In the case of the bullseye-bookworm migration, on some vms, we needed to uninstall some
+package and disable some new failing services.
+
+.. code::
+
+   root@node:~# apt purge -y openipmi
+   root@node:~# systemctl reset-failed   # so icinga stops complaining
+
+
+Step 8: Join back the rancher cluster
+-------------------------------------
+
+After the node reboots, check the node joined back the Rancher cluster.
+
+And then must ``uncordon`` the node so the kube scheduler can schedule pods on this node
+again (the node will be mared as ``ready``.