On RHCS cluster migrate all local services to another node, update operating system and reboot

rhcs_update_node.sh

#!/bin/bash
#
# On RHCS cluster migrate all local services to another
# node, update operating system and reboot
#

NODES=`cman_tool nodes -F type,name | awk '$1 == "M" { print $2 }'`
if [ `echo "${NODES}" | wc -w` -le 1 ]; then
	echo "Not enough nodes ($NODES), at least 2 active needed"
	exit 1
fi

LOCAL_NODE=`cman_tool status | awk -F': ' '$1 ~ /^Node name/ { print $2 }'`
if [ "x${LOCAL_NODE}" == 'x' ]; then
	echo "Unknown local node cluster name"
	exit 1
fi

OTHER_NODE=`echo "$NODES" | grep -v "${LOCAL_NODE}"`
if [ "x${OTHER_NODE}" == 'x' ]; then
	echo "Failed to filter other node name"
	exit 1
fi

LOCAL_SERVICES=`clustat | awk "\\$2 ~ /$LOCAL_NODE/ { print \\$1 }"`
if [ "x${LOCAL_SERVICES}" == 'x' ]; then
	echo "No local services to migrate"
	exit 1
fi

# summary
echo "Cluster nodes:  "${NODES}
echo "Local node:     "${LOCAL_NODE}
echo "Candidate node: "${OTHER_NODE}
echo "Services:       "${LOCAL_SERVICES}
echo

# migrate all local services to first other node
# 1. try live migration
# 2. try cold migration (stop/start)
# if no migration succeeds, fail!
for S in $LOCAL_SERVICES; do
	clusvcadm -M "${S}" -m "${OTHER_NODE}" || \
		clusvcadm -r "${S}" -m "${OTHER_NODE}" || \
			exit
done
echo "... done"

if yum update; then
	shutdown -r +5 "System update done, rebooting machine"

	(	
		for S in rgmanager sanlock gfs2 clvmd; do
			service ${S} stop
		done

		service cman stop remove
	) &
else
	echo 'Update failed!'
fi