orphaned_vms.sh: initial commit

orphaned_vms.sh is a script that searches through the current VMs (as
reported by nova) and retrieves their own.  Then, it cross checks that
list against a tenant listing  (as reported by keystone).  Any VMs whose
owner does not exist in keystone is assumed to be orphaned. This can
happen if a tenant is deleted while it still has VMs online.

Change-Id: I880b66e6d303e3348ac1d7fde1762633ae9ac07a

nova/orphaned_vms.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# OpenStack credentials are expected to be in your environment variables
+if [ -z "$OS_AUTH_URL" -o -z "$OS_PASSWORD" -o -z "$OS_USERNAME" ]; then
+	echo "Please set OpenStack auth environment variables."
+	exit 1
+fi
+
+# temp files used for caching outputs
+vm_tenants=$(mktemp)
+keystone_tenants=$(mktemp)
+
+# get a list of all VMs in the cluster and who they belong to
+echo -en "Retrieving list of all VMs...\r"
+nova list --all-tenants --fields tenant_id | tail -n +4 | awk '{print $4}' | sort -u > $vm_tenants
+total_vms=$(cat $vm_tenants | wc -l)
+if [ $total_vms == 0 ]; then
+	echo "Zero VMs found. Exiting..."
+	rm -f $vm_tenants $keystone_tenants
+	exit 1
+fi
+
+# get a list of all tenants/projects in the cluster
+echo -en "Retrieving list of all tenants...\r"
+keystone tenant-list | tail -n +4 | awk '{print $2}' | sort -u > $keystone_tenants
+total_tenants=$(cat $keystone_tenants | wc -l)
+if [ $total_tenants == 0 ]; then
+	echo "Zero tenants found. Exiting..."
+	rm -f $vm_tenants $keystone_tenants
+	exit 1
+fi
+
+# compare all VM owners to all tenants as reported by keystone and print
+# any VMs whose owner does not exist in keystone
+echo -en "Comparing outputs to locate orphaned VMs....\r"
+iter=0
+for tenant_id in `comm --nocheck-order -13 $keystone_tenants $vm_tenants`; do
+	if [[ $iter == 0 ]]; then
+		nova list --all-tenants --tenant=$tenant_id --fields tenant_id,name,status,created,updated | head -n -1
+		let "iter++"
+	else
+		nova list --all-tenants --tenant=$tenant_id --fields tenant_id,name,status,created,updated | tail -n +4 | head -n -1
+	fi
+done
+
+# cleanup after ourself
+rm $keystone_tenants $vm_tenants