Add decomissioning howto

tsa.creole

@@ -19,9 +19,9 @@ For a list of services and which servers they run on check
 
 == documentation
 
-*
+* [[doc/testing]]
 
 == internal documentation
 
-* [[doc/testing]]
+* [[howto/retire-a-host]]
 

tsa/howto.creole

+[[!map pages="tsa/howto/* and ! tsa/howto/*/*"]]

tsa/howto/retire-a-host.creole

+= Decommissioning a host =
+
+* stop the VM: virsh destroy $host
+* undefine it: virsh undefine $host
+* remove the LVM logical volumes
+* remove it from the tor-virt git
+* remove it from ud-ldap
+* on pauli:
+** puppetca revoke $host.torroject.org
+** puppetca clean $host.torroject.org
+** puppet node clean $host.torproject.org