Including found known issues

saltstack/readme.md

@@ -113,6 +113,11 @@ The nodegroups are defined based on grains rules:
       slave: 'G@emr:instance_role:Core or G@emr:instance_role:Task'
 
 
+## Known issues ##
+
+When running in syndicated mode, sometimes the minions fail to unregister from the master of masters when they are shutdown (such as after a resize of a instance group). Most people would probably use the default mode which doesn't exhibit this problem. The script 'salt_clean.sh' can be run in the master of masters (as root user) to clean the "zombie" unregistered minions.
+
+
 ## Brief introduction to SaltStack ##
 
 [SaltStack](https://docs.saltstack.com/en/2015.5/) is an open source tool for automation and infrastructure management (such as Chef or Puppet). It started as a remote execution engine, it's based on ZeroMQ.

saltstack/salt_clean.sh

@@ -0,0 +1,21 @@
+#! /bin/bash
+
+echo "Cleaning minions that do not respond to ping... "
+
+salt  '*'  test.ping > /tmp/all_hosts
+
+cat all_hosts | grep return -B 1 | grep -v 'return' | cut -d ':' -f1 > /tmp/salt_error_hosts
+
+for i in $( cat salt_error_hosts); do
+  # for deleting the auth-key
+  salt-key -d $i -y;
+  # for delete the unauth key , sometimes it's needed:
+  salt-key -d $i -y;
+  # delete the pem file
+  if [ -f /etc/salt/pki/master/minions/%i ]; then
+        rm -f /etc/salt/pki/master/minions/$i
+  fi
+done
+
+rm /tmp/all_hosts /tmp/salt_error_hosts
+echo "done"