Added the infra SOPs ported to asciidoc.

modules/sysadmin_guide/pages/infra-retiremachine.adoc

@@ -0,0 +1,44 @@
+= Infrastructure retire machine SOP
+
+== Introduction
+
+When a machine (be it virtual instance or real physical hardware is
+decommisioned, a set of steps must be followed to ensure that the
+machine is properly removed from the set of machines we manage and
+doesn't cause problems down the road.
+
+== Retire process
+
+[arabic]
+. {blank}
++
+Ensure that the machine is no longer used for anything. Use git-grep,::
+  stop services, etc.
+. {blank}
++
+Remove the machine from ansible. Make sure you not only remove the
+main::
+  machine name, but also any aliases it might have (or move them to an
+  active server if they are active services. Make sure to search for the
+  IP address(s) of the machine as well. Ensure dns is updated to remove
+  the machine.
+. {blank}
++
+Remove the machine from any labels in hardware devices like consoles
+or::
+  the like.
+. Revoke the ansible cert for the machine.
+. {blank}
++
+Move the machine xml defintion to ensure it does NOT start on boot.
+You::
+  can move it to 'name-retired-YYYY-MM-DD'.
+. {blank}
++
+Ensure any backend storage the machine was using is freed or renamed
+to::
+  name-retired-YYYY-MM-DD
+
+== TODO
+
+fill in commands