text: DBAAS_API = "dbaas.api"
  PRE_INSTANCES = "dbaas.api.pre_instances"
  INSTANCES = "dbaas.api.instances"
  POST_INSTANCES = "dbaas.api.post_instances"
  SSH_CMD = 'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'
  