先在swarm manager节点上安装一下 docker-compose 
    1. vagrant@swarm-manager:~$ sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
    2. vagrant@swarm-manager:~$ sudo chmod +x /usr/local/bin/docker-compose
    clone我们的代码仓库 
    1. vagrant@swarm-manager:~$ git clone https://github.com/xiaopeng163/flask-redis
    2. Cloning into 'flask-redis'...
    3. remote: Enumerating objects: 22, done.
    4. remote: Counting objects: 100% (22/22), done.
    5. remote: Compressing objects: 100% (19/19), done.
    6. remote: Total 22 (delta 9), reused 7 (delta 2), pack-reused 0
    7. Unpacking objects: 100% (22/22), 8.60 KiB | 1.07 MiB/s, done.
    8. vagrant@swarm-manager:~$ cd flask-redis
    9. vagrant@swarm-manager:~/flask-redis$ ls
    10. Dockerfile  LICENSE  README.md  app.py  docker-compose.yml
    11. vagrant@swarm-manager:~/flask-redis$
    环境清理 
    1. vagrant@swarm-manager:~/flask-redis$ docker system prune -a -f
    镜像构建和提交， 如果你想做这一步，可以把docker-compose.yml里的 xiaopeng163/flask-redis 改成你的dockerhub id 
    1. vagrant@swarm-manager:~/flask-redis$ docker-compose build
    2. vagrant@swarm-manager:~/flask-redis$ docker image ls
    3. REPOSITORY                TAG          IMAGE ID       CREATED         SIZE
    4. xiaopeng163/flask-redis   latest       5efb4fcbcfc3   6 seconds ago   126MB
    5. python                    3.9.5-slim   c71955050276   3 weeks ago     115MB
    提交镜像到dockerhub 
    1. vagrant@swarm-manager:~/flask-redis$ docker login
    2. Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
    3. Username: xiaopeng163
    4. Password:
    5. WARNING! Your password will be stored unencrypted in /home/vagrant/.docker/config.json.
    6. Configure a credential helper to remove this warning. See
    7. https://docs.docker.com/engine/reference/commandline/login/#credentials-store
    9. Login Succeeded
    10. vagrant@swarm-manager:~/flask-redis$ docker-compose push
    11. WARNING: The REDIS_PASSWORD variable is not set. Defaulting to a blank string.
    12. Pushing flask (xiaopeng163/flask-redis:latest)...
    13. The push refers to repository [docker.io/xiaopeng163/flask-redis]
    14. f447d33c161b: Pushed
    15. f7395da2fd9c: Pushed
    16. 5b156295b5a3: Layer already exists
    17. 115e0863702d: Layer already exists
    18. e10857b94a57: Layer already exists
    19. 8d418cbfaf25: Layer already exists
    20. 764055ebc9a7: Layer already exists
    21. latest: digest: sha256:c909100fda2f4160b593b4e0fb692b89046cebb909ae90546627deca9827b676 size: 1788
    22. vagrant@swarm-manager:~/flask-redis$
    通过stack启动服务 
    1. vagrant@swarm-manager:~/flask-redis$ env REDIS_PASSWORD=ABC123 docker stack deploy --compose-file docker-compose.yml flask-demo
    2. Ignoring unsupported options: build
    4. Creating network flask-demo_default
    5. Creating service flask-demo_flask
    6. Creating service flask-demo_redis-server
    7. vagrant@swarm-manager:~/flask-redis$
    8. vagrant@swarm-manager:~/flask-redis$ docker stack ls
    9. NAME         SERVICES   ORCHESTRATOR
    10. flask-demo   2          Swarm
    11. vagrant@swarm-manager:~/flask-redis$ docker stack ps flask-demo
    12. ID             NAME                        IMAGE                            NODE            DESIRED STATE   CURRENT STATE
    13. ERROR     PORTS
    14. lzm6i9inoa8e   flask-demo_flask.1          xiaopeng163/flask-redis:latest   swarm-manager   Running         Running 23 seconds ago
    16. ejojb0o5lbu0   flask-demo_redis-server.1   redis:latest                     swarm-worker2   Running         Running 21 seconds ago
    18. vagrant@swarm-manager:~/flask-redis$ docker stack services flask-demo
    19. ID             NAME                      MODE         REPLICAS   IMAGE                            PORTS
    20. mpx75z1rrlwn   flask-demo_flask          replicated   1/1        xiaopeng163/flask-redis:latest   *:8080->5000/tcp
    21. z85n16zsldr1   flask-demo_redis-server   replicated   1/1        redis:latest
    22. vagrant@swarm-manager:~/flask-redis$ docker service ls
    23. ID             NAME                      MODE         REPLICAS   IMAGE                            PORTS
    24. mpx75z1rrlwn   flask-demo_flask          replicated   1/1        xiaopeng163/flask-redis:latest   *:8080->5000/tcp
    25. z85n16zsldr1   flask-demo_redis-server   replicated   1/1        redis:latest
    26. vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
    27. Hello Container World! I have been seen 1 times and my hostname is 21d63a8bfb57.
    28. vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
    29. Hello Container World! I have been seen 2 times and my hostname is 21d63a8bfb57.
    30. vagrant@swarm-manager:~/flask-redis$ curl 127.0.0.1:8080
    31. Hello Container World! I have been seen 3 times and my hostname is 21d63a8bfb57.
    32. vagrant@swarm-manager:~/flask-redis$