Pause/unpause all the virtual machines in a OpenStack cloud

os-nova-pause.sh

#!/bin/bash
#
# Usage:
#   ./os-nova-pause.sh pause
#
# Note: remember to define the environment variables used by the openstack clients
# typically this is done sourcing a 'openrc' file (you can download it from horizon)
#

function mod_server {
  local tenant_id="$1"
  local server_id="$2"
  local op="$3"

  local nova_opts=""
  if [ -n "$tenant_id" ]; then
    nova_opts="--os-tenant-id $1"
  fi

  nova $nova_opts $op $server_id
  return $?
}


operation="${1:-pause}"

echo "Going to $operation ALL the virtual machines"

for tenant_id in $(keystone tenant-list | grep -v ' service ' | tail -n +4 | head -n -1 | cut -d'|' -f2); do
  for server_id in $(nova --os-tenant-id "$tenant_id" list | grep -v PAUSED | tail -n +4 | head -n -1 | cut -d'|' -f2); do
    echo -n "$operation $server_id (tenant $tenant_id)..."
    mod_server $tenant_id $server_id $operation
    if [ "$?" == "0" ]; then
      echo "done"
    else
      echo "ERROR"
      exit 1
    fi
  done
done