service

创建 swarm

$ docker swarm init --advertise-addr 192.168.56.205
Swarm initialized: current node (9fu8b0ot055ayazhcxu61jv33) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-1onpqfhmh9krhfkdw5bucfvr4vriulm0ber2f1gmbrqp7eh0m0-ewm3hnddibbq45492igzx2rxr 192.168.56.205:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

发布 stack

$ docker stack deploy -c docker-compose.yml getstartedlab
Creating network getstartedlab_webnet
Creating service getstartedlab_web

Let’s inspect one task and limit the ouput to container ID:

通过 docker service 查询 service 信息

Get the service ID for the one service in our application:

$ docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE                          PORTS
jhkiqvpxov65        getstartedlab_web   replicated          3/3                 uyinn28/friendlyhello:latest   *:80->80/tcp

Docker swarms run tasks that spawn containers. Tasks have state and their own IDs:

$ docker service ps getstartedlab_web

# 结果中的 ID 就是 task ID
ID                  NAME                      IMAGE                          NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
igyp06sdql0s        getstartedlab_web.1       uyinn28/friendlyhello:latest   S005_Ubuntu1604S    Running             Running 6 minutes ago                        
wuc02ndv48f7         \_ getstartedlab_web.1   uyinn28/friendlyhello:latest   S005_Ubuntu1604S    Shutdown            Shutdown 6 minutes ago                       
qsssyx6rwz07        getstartedlab_web.6       uyinn28/friendlyhello:latest   S005_Ubuntu1604S    Running             Running 6 minutes ago                        
to0xg7tp59bk        getstartedlab_web.10      uyinn28/friendlyhello:latest   S005_Ubuntu1604S    Running             Running 6 minutes ago

通过 docker container 查询 container 的信息

$ docker container ps -a
CONTAINER ID        IMAGE                          COMMAND                  CREATED             STATUS                       PORTS                    NAMES
ea8167447298        uyinn28/friendlyhello:latest   "python app.py"          10 minutes ago      Up 9 minutes                 80/tcp                   getstartedlab_web.6.qsssyx6rwz07ppch07jud2rnk
100bcb7eb051        uyinn28/friendlyhello:latest   "python app.py"          10 minutes ago      Up 9 minutes                 80/tcp                   getstartedlab_web.10.to0xg7tp59bkshrrvgf4yhutp
e12bb83371fd        uyinn28/friendlyhello:latest   "python app.py"          10 minutes ago      Up 9 minutes                 80/tcp                   getstartedlab_web.1.igyp06sdql0s8eo0eyg6dz9lq
354f388506c7        uyinn28/friendlyhello:latest   "python app.py"          36 minutes ago      Exited (137) 9 minutes ago                            getstartedlab_web.1.wuc02ndv48f7jp71sm0s0jya6
b712972c07d5        registry:2                     "/entrypoint.sh /e..."   24 hours ago        Up 24 hours                  0.0.0.0:5000->5000/tcp   registry

# 注意，<task> 是 NAMES 对应值中，以 `.` 分割的最后一位。

task_id 和 container_id 互查

# 通过 task 值查询 container id
$ docker inspect --format='{{.Status.ContainerStatus.ContainerID}}' <task>

$ docker inspect --format='{{.Status.ContainerStatus.ContainerID}}' igyp06sdql0s
e12bb83371fd9a661e34d16e69dc7c56bb0a832d92ecd620042823da6a807725

Vice versa, inspect the container ID, and extract the task ID:

# 通过 container id 查询 task id
$ docker inspect --format="{{index .Config.Labels \"com.docker.swarm.task.id\"}}" <container>

$ docker inspect --format="{{index .Config.Labels \"com.docker.swarm.task.id\"}}" 100bcb7eb051
to0xg7tp59bkshrrvgf4yhutp

Scale the app

You can scale the app by changing the replicas value in docker-compose.yml, saving the change, and re-running the docker stack deploy command:

$ docker stack deploy -c docker-compose.yml getstartedlab

Updating service getstartedlab_web (id: oauk2ifq9mfkg1k2kdr8cqgur)

Docker will do an in-place update, no need to tear the stack down first or kill any containers.

$ docker container ls -q

ea8167447298
100bcb7eb051
e12bb83371fd
b712972c07d5

Take down the app and the swarm

Take the app down with docker stack rm:

$ docker stack rm getstartedlab

Removing service getstartedlab_web
Removing network getstartedlab_webnet

This removes the app, but our one-node swarm is still up and running (as shown by docker node ls). Take down the swarm with docker swarm leave --force.

退出 swarm

  • 节点退出 docker swarm leave
  • swarm manager 必须使用 --force 强制退出

# 查看节点
$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS
9fu8b0ot055ayazhcxu61jv33 *   S005_Ubuntu1604S    Ready               Active              Leader

$ docker swarm leave

# swarm manager 必须使用 `--force` 强制退出
Error response from daemon: You are attempting to leave the swarm on a node that is participating as a manager. Removing the last manager erases all current state of the swarm. Use `--force` to ignore this message.



# 退出
$ docker swarm leave --force
Node left the swarm.

$ docker node ls
Error response from daemon: This node is not a swarm manager. Use "docker swarm init" or "docker swarm join" to connect this node to swarm and try again.

本节命令

docker stack ls                                            # List stacks or apps
docker stack deploy -c <composefile> <appname>  # Run the specified Compose file
docker service ls                 # List running services associated with an app
docker service ps <service>                  # List tasks associated with an app
docker inspect <task or container>                   # Inspect task or container
docker container ls -q                                      # List container IDs
docker stack rm <appname>                             # Tear down an application

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