restart swarm-agent on failure

Author: mac@lowang

playbooks/roles/swarm-manage/templates/swarm-agent.service.j2

@@ -12,6 +12,7 @@ ExecStart=/usr/bin/docker run \
           --addr={{ node_ip }}:{{ docker_port }} \
           etcd://{{ node_ip }}:{{ etcd_client_port }}/lain/swarm
 ExecStop=/bin/bash -c '/usr/bin/docker stop %n || true'
+Restart=on-failure
 
 [Install]
 WantedBy=multi-user.target