如何像docker-compose一样部署多服务应用，这一节我们先看手动的方式
    创建一个mynet的overlay网络

    1. vagrant@swarm-manager:~$ docker network ls
    2. NETWORK ID     NAME              DRIVER    SCOPE
    3. afc8f54c1d07   bridge            bridge    local
    4. 128fd1cb0fae   docker_gwbridge   bridge    local
    5. 0ea68b0d28b9   host              host      local
    6. 14fy2l7a4mci   ingress           overlay   swarm
    7. lpirdge00y3j   mynet             overlay   swarm
    8. a8edf1804fb6   none              null      local
    9. vagrant@swarm-manager:~$

    创建一个redis的service

    1. vagrant@swarm-manager:~$ docker service create --network mynet --name redis redis:latest redis-server --requirepass ABC123
    2. qh3nfeth3wc7uoz9ozvzta5ea
    3. overall progress: 1 out of 1 tasks
    4. 1/1: running   [==================================================>]
    5. verify: Service converged
    6. vagrant@swarm-manager:~$ docker servce ls
    7. docker: 'servce' is not a docker command.
    8. See 'docker --help'
    9. vagrant@swarm-manager:~$ docker service ls
    10. ID             NAME      MODE         REPLICAS   IMAGE          PORTS
    11. qh3nfeth3wc7   redis     replicated   1/1        redis:latest
    12. vagrant@swarm-manager:~$ docker service ps redis
    13. ID             NAME      IMAGE          NODE            DESIRED STATE   CURRENT STATE            ERROR     PORTS
    14. 111cpkjn4a0k   redis.1   redis:latest   swarm-worker2   Running         Running 19 seconds ago
    15. vagrant@swarm-manager:~$

    创建一个flask的service

    vagrant@swarm-manager:~$ docker service create --network mynet --name flask --env REDIS_HOST=redis --env REDIS_PASS=ABC123 -p 8080
:5000 xiaopeng163/flask-redis:latest
y7garhvlxah592j5lmqv8a3xj
overall progress: 1 out of 1 tasks
1/1: running   [==================================================>]
verify: Service converged
vagrant@swarm-manager:~$ docker service ls
ID             NAME      MODE         REPLICAS   IMAGE                            PORTS
y7garhvlxah5   flask     replicated   1/1        xiaopeng163/flask-redis:latest   *:8080->5000/tcp
qh3nfeth3wc7   redis     replicated   1/1        redis:latest
vagrant@swarm-manager:~$ docker service ps flask
ID             NAME      IMAGE                            NODE            DESIRED STATE   CURRENT STATE            ERROR     PORTS
quptcq7vb48w   flask.1   xiaopeng163/flask-redis:latest   swarm-worker1   Running         Running 15 seconds ago
vagrant@swarm-manager:~$ curl 127.0.0.1:8080
Hello Container World! I have been seen 1 times and my hostname is d4de54036614.
vagrant@swarm-manager:~$ curl 127.0.0.1:8080
Hello Container World! I have been seen 2 times and my hostname is d4de54036614.
vagrant@swarm-manager:~$ curl 127.0.0.1:8080
Hello Container World! I have been seen 3 times and my hostname is d4de54036614.
vagrant@swarm-manager:~$ curl 127.0.0.1:8080
Hello Container World! I have been seen 4 times and my hostname is d4de54036614.
vagrant@swarm-manager:~$