docker-machine & docker swarm基本使用

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#docker-machine #docker swarm

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本文接上篇，记录了安装好docker-machine并创建hyper-v虚拟机后的基本使用。包括用docker-machine管理虚拟机节点、创建服务，初始化swarm集群，将节点加入或退出集群，创建ping服务并查看状态，以及服务的弹性扩容和收缩等操作，还提及更多命令解释。

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接上篇：我是上篇(docker-machine hyper-v)

安装好docker-machine并创建hyper-v虚拟机之后，下面记一下基本使用：

 .\docker-machine.exe create -d hyperv --hyperv-virtual-switch "Virtual Switch(Main)" manager1
 .\docker-machine.exe create -d hyperv --hyperv-virtual-switch "Virtual Switch(Main)" worker1
 .\docker-machine.exe create -d hyperv --hyperv-virtual-switch "Virtual Switch(Main)" worker2

创建好虚拟机之后, 使用docker-machine来管理虚拟机节点，并创建服务service，进入docker容器查看。

查看当前虚拟机节点：

PS D:\docker\machine\bin> .\docker-machine.exe  ls
NAME       ACTIVE   DRIVER   STATE     URL                        SWARM   DOCKER     ERRORS
manager1   -        hyperv   Running   tcp://192.168.72.26:2376           v18.09.6
worker1    -        hyperv   Running   tcp://192.168.72.27:2376           v18.09.6
worker2    -        hyperv   Running   tcp://192.168.72.28:2376           v18.09.6

连接manager1节点，并初始化swarm集群，打印的信息可以看到提示加入集群所需执行的命令。docker info可以查看集群信息

PS D:\docker\machine\bin> .\docker-machine.exe ssh manager1
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

docker@manager1:~$ docker -v
Docker version 18.09.6, build 481bc77
docker@manager1:~$ docker swarm init --advertise-addr 192.168.72.26
Swarm initialized: current node (y1xeo1k4opnq4eea9qeazcyk8) is now a manager.

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

    docker swarm join --token SWMTKN-1-4zzopt74o78yci6imcma2or4w8jsunh3uai4j3taqpdfvwsgbp-3l1r0uhk7bayrz4rtb4yly5s2 192.168.72.26:2377

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

退出manager1, 分别连接到worker1和worker2，将他们加入到集群中，docker swarm join --token xxxx ip:port

docker@manager1:~$ exit
logout
PS D:\docker\machine\bin> .\docker-machine.exe ssh worker1
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

docker@worker1:~$ docker -v
Docker version 18.09.6, build 481bc77
docker@worker1:~$ docker swarm join --token SWMTKN-1-4zzopt74o78yci6imcma2or4w8jsunh3uai4j3taqpdfvwsgbp-3l1r0uhk7bayrz4rtb4yly5s2 192.168.72.26:2377
This node joined a swarm as a worker.

重新进入manager1，查看集群信息

PS D:\docker\machine\bin> .\docker-machine.exe ssh manager1
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

docker@manager1:~$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
y1xeo1k4opnq4eea9qeazcyk8 *   manager1            Ready               Active              Leader              18.09.6
zqgb9fcdmxptulfkanczyf0i0     worker1             Ready               Active                                  18.09.6
99y1cqxlbfsunzsrwwipp6i60     worker2             Ready               Active                                  18.09.6

创建一个ping服务，并查看服务运行状态，--replicas 启动副本数，--name 服务名称， alpine代表镜像名称，后面的是执行的命令。alpine镜像需要存在，所以要先pull下来，然后再进行后续操作

docker@manager1:~$ docker search alpine
...
docker@manager1:~$ docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
Digest: sha256:ca1c944a4f8486a153024d9965aafbe24f5723c1d5c02f4964c045a16d19dc54
Status: Downloaded newer image for alpine:latest
docker@manager1:~$ docker service create --replicas 2 --name hello alpine ping baidu.com
zapayrx2ksozadjo7w52yowtk
overall progress: 1 out of 1 tasks
1/1: running
verify: Waiting 4 seconds to verify that tasks are stable...
verify: Service converged
docker@manager1:~$ docker service ps hello
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
5l2e1ej5cov5        hello.1             alpine:latest       worker1             Running             Running 11 seconds ago            
uiyag7vxfcgy        hello.2             alpine:latest       manager1            Running             Running 11 seconds ago     
docker@manager1:~$ docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
5tmd76toz3nr        hello               replicated          2/2                 alpine:latest

可以连接到worker1,通过docker ps 查看容器中运行的进程。

服务的弹性扩容和收缩，到manager1管理节点执行命令

docker@manager1:~$ docker service update --replicas 3 hello
hello
overall progress: 2 out of 3 tasks
overall progress: 3 out of 3 tasks
1/3: running
2/3: running
3/3: running
verify: Service converged
docker@manager1:~$ docker service ps hello
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
5l2e1ej5cov5        hello.1             alpine:latest       worker1             Running             Running 15 minutes ago            
uiyag7vxfcgy        hello.2             alpine:latest       manager1            Running             Running 15 minutes ago            
2vchohxlhzhm        hello.3             alpine:latest       worker2             Running             Running 9 seconds ago             
docker@manager1:~$ docker service update --replicas 1 hello
hello
overall progress: 1 out of 1 tasks
1/1: running
verify: Service converged

将woker2退出集群， ssh到worker2节点，执行docker swarm leave退出集群，ssh manger1查看集群节点信息，worker2状态为down, 重新加入，执行docker swarm join操作即可。

PS D:\docker\machine\bin> .\docker-machine.exe ssh worker2
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

docker@worker2:~$ docker swarm leave
Node left the swarm.
docker@worker2:~$ exit
logout
PS D:\docker\machine\bin> .\docker-machine.exe ssh manager1
   ( '>')
  /) TC (\   Core is distributed with ABSOLUTELY NO WARRANTY.
 (/-_--_-\)           www.tinycorelinux.net

docker@manager1:~$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
y1xeo1k4opnq4eea9qeazcyk8 *   manager1            Ready               Active              Leader              18.09.6
zqgb9fcdmxptulfkanczyf0i0     worker1             Ready               Active                                  18.09.6
99y1cqxlbfsunzsrwwipp6i60     worker2             Down                Active                                  18.09.6

更多命令解释：docker-machine command line