创建service

  • 使用docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]创建

    1. [root@localhost ~]# docker service create
    2. "docker service create" requires at least 1 argument.
    3. See 'docker service create --help'.
    4. Usage:  docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]
    5. Create a new service
    6. [root@localhost ~]# docker service create --help
    7. Usage:  docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]
    8. Create a new service
    9. ...

  • 例子

    1. [root@localhost ~]# docker service create nginx:latest
    2. ujf1xtef2e7xqleqrmh75b0mg
    3. overall progress: 1 out of 1 tasks 
    4. 1/1: running   [==================================================>] 
    5. verify: Service converged 
    6. [root@localhost ~]# 
    7. [root@localhost ~]# docker service ls
    8. ID             NAME                    MODE         REPLICAS   IMAGE          PORTS
    9. ujf1xtef2e7x   mystifying_cartwright   replicated   1/1        nginx:latest

    Note：这里输出的id是service的id而非container的id。service等同于container。

查看service信息

  • docker service ls：查看所有的service基本信息

  • docker service ps [SERVICE_ID]：查看具体某个service的信息

    1. [root@localhost ~]# docker service ls
    2. ID             NAME                    MODE         REPLICAS   IMAGE          PORTS
    3. ujf1xtef2e7x   mystifying_cartwright   replicated   1/1        nginx:latest   
    4. [root@localhost ~]# 
    5. [root@localhost ~]# docker service ps uj
    6. ID             NAME                      IMAGE          NODE                    DESIRED STATE   CURRENT STATE           ERROR     PORTS
    7. nlj4so00wxz3   mystifying_cartwright.1   nginx:latest   localhost.localdomain   Running         Running 3 minutes ago

  • 查看容器信息发现容器id与service id确实不一样

    1. [root@localhost ~]# docker container ls
    2. CONTAINER ID   IMAGE          COMMAND                  CREATED         STATUS         PORTS     NAMES
    3. 49e36233b260   nginx:latest   "/docker-entrypoint.…"   5 minutes ago   Up 5 minutes   80/tcp    mystifying_cartwright.1.nlj4so00wxz3wo07lyktjzx3c

    利用replicas复制多个容器

    同一个服务启动多个容器

  • docker service update [SERVICE_ID] --replicas [NUMBER]

    1. [root@localhost ~]# docker service update uj --replicas 3
    2. uj
    3. overall progress: 3 out of 3 tasks
    4. 1/3: running   [==================================================>]
    5. 2/3: running   [==================================================>]
    6. 3/3: running   [==================================================>]
    7. verify: Service converged
    8. [root@localhost ~]#
    9. [root@localhost ~]# docker service ls
    10. ID             NAME                    MODE         REPLICAS   IMAGE          PORTS
    11. ujf1xtef2e7x   mystifying_cartwright   replicated   3/3        nginx:latest
    12. [root@localhost ~]# docker service ps uj
    13. ID             NAME                      IMAGE          NODE                    DESIRED STATE   CURRENT STATE            ERROR     PORTS
    14. nlj4so00wxz3   mystifying_cartwright.1   nginx:latest   localhost.localdomain   Running         Running 13 minutes ago
    15. v7l8v247h2qo   mystifying_cartwright.2   nginx:latest   localhost.localdomain   Running         Running 45 seconds ago
    16. xy85ftdwcpmp   mystifying_cartwright.3   nginx:latest   localhost.localdomain   Running         Running 45 seconds ago
    17. [root@localhost ~]#
    18. [root@localhost ~]# docker container ls
    19. CONTAINER ID   IMAGE          COMMAND                  CREATED              STATUS              PORTS     NAMES
    20. 753076d85b2a   nginx:latest   "/docker-entrypoint.…"   About a minute ago   Up About a minute   80/tcp    mystifying_cartwright.2.v7l8v247h2qo3x06tk31syvbx
    21. 6cf61228c7a3   nginx:latest   "/docker-entrypoint.…"   About a minute ago   Up About a minute   80/tcp    mystifying_cartwright.3.xy85ftdwcpmpibb41h8kkjof6
    22. 49e36233b260   nginx:latest   "/docker-entrypoint.…"   13 minutes ago       Up 13 minutes       80/tcp    mystifying_cartwright.1.nlj4so00wxz3wo07lyktjzx3c
    23. [root@localhost ~]#

    swarm维护service的replicas

  • 先删除掉service中的某个replica即删除一个容器，会发现swarm会自动开启另一个replica

    1. [root@localhost ~]# docker container rm -f 753
    2. 753
    3. [root@localhost ~]#
    4. [root@localhost ~]# docker service ps uj
    5. ID             NAME                          IMAGE          NODE                    DESIRED STATE   CURRENT STATE            ERROR                         PORTS
    6. nlj4so00wxz3   mystifying_cartwright.1       nginx:latest   localhost.localdomain   Running         Running 16 minutes ago                           
    7. p16tkh74v5om   mystifying_cartwright.2       nginx:latest   localhost.localdomain   Running         Running 11 seconds ago                           
    8. v7l8v247h2qo    \_ mystifying_cartwright.2   nginx:latest   localhost.localdomain   Shutdown        Failed 17 seconds ago    "task: non-zero exit (137)"
    9. xy85ftdwcpmp   mystifying_cartwright.3       nginx:latest   localhost.localdomain   Running         Running 4 minutes ago

    停止service

  • docker service rm [SERVICE_ID]

    1. [root@localhost ~]# docker service rm uj
    2. uj
    3. [root@localhost ~]# docker service ls
    4. ID        NAME      MODE      REPLICAS   IMAGE     PORTS
    5. [root@localhost ~]#