docker 实践（八）docker 主机共享volume

xingyu655

　　一、挂载host volume到容器
　　1.1.指定挂载本地资源到容器
　　1.1.1.本地文件
# cat index.html
There is nothing here　　1.1.2.创建容器，挂载本地资源
# docker run -d -p 80:80 -v ~/index.html:/usr/share/nginx/html/index.html --name "cklng" nginx
83826f3fdb3d940fb2fd18af4223da695758e8ac7eb73e07215c461904e161cb# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
83826f3fdb3d        nginx               "nginx -g 'daemon of…"   4 seconds ago       Up 3 seconds        0.0.0.0:80->80/tcp       cklng　　1.1.3.访问容器
# curl http://127.0.0.1:80
There is nothing here
# docker inspect 83826f3fdb3d
....
"Mounts": [
            {
                "Type": "bind",
                "Source": "/root/index.html",  #本地目录文件
                "Destination": "/usr/share/nginx/html/index.html",  #容器目录文件
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
....　　1.2.不指定本地资源挂载到容器
　　1.2.1.运行容器，不指定本地资源
# docker run -d -p 80:80 -v /usr/share/nginx/html/ --name "cklng1" nginx                       
8d8fc0a101a03bc7b098f0838e9583cf2a673ecbc6c543739cf2f2803bb713e3　　1.2.2.访问容器
# curl http://127.0.0.1:80



Welcome to nginx!

    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }



Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.
For online documentation and support please refer to
nginx.org.
Commercial support is available at
nginx.com.
Thank you for using nginx.

　　1.2.3.查看容器详情
# docker inspect 8d8fc0a101a0
...
"Mounts": [
            {
                "Type": "volume",
                "Name": "af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef",
                "Source": "/var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data",  #主机资源路径
                "Destination": "/usr/share/nginx/html",  #挂载到容器的目录
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
....
#ls /var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data/
50x.html    index.html　　#容器生产一个随机目录作为mount的源
　　#查看mount源内容：
# cat /var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data/index.html



Welcome to nginx!

    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }



Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.
For online documentation and support please refer to
nginx.org.
Commercial support is available at
nginx.com.
Thank you for using nginx.

　　1.2.3.查看volume详情
# docker volume ls
DRIVER              VOLUME NAME
local               af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef# docker volume inspect af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef
[
    {
        "CreatedAt": "2018-12-19T01:05:34-05:00",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data",
        "Name": "af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef",
        "Options": null,
        "Scope": "local"
    }
]　　修改volume内容：
# cat /var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data/index.html   
THIS IS NO NO NO PANGE!　　访问容器：
# curl http://127.0.0.1:80
THIS IS NO NO NO PANGE!　　进入容器查看：
# docker exec -it 8d8fc0a101a0 /bin/bash
root@8d8fc0a101a0:/# cat /usr/share/nginx/html/index.html
THIS IS NO NO NO PANGE!　　1.2.4.容器停止后volume
# docker stop 8d8fc0a101a0
8d8fc0a101a0# docker rm 8d8fc0a101a0
8d8fc0a101a0# cat /var/lib/docker/volumes/af5af5d925c4e4109d5d9ab4ff9112bee5ec56b1dfc64ce1294e23ed458c50ef/_data/index.html   
THIS IS NO NO NO PANGE!　　#host文件依然存在
　　使用-v 可以删除本地挂载资源
# docker rm -v 71b9d9f74d2a　　2.容器共享数据
　　2.1.如上共享，挂载本地的同一个volume
　　2.1.1.创建三个容器，挂载同一个目录
# docker run -d -p 80 -v ~/index.html:/usr/share/nginx/html/index.html --name "cklng1" nginx
75cb89bb9430ed47022c76a854c64cdc043571d8be0215d7223355713fb9c078
[root@localhost ~]# docker run -d -p 80 -v ~/index.html:/usr/share/nginx/html/index.html --name "cklng2" nginx
4e8699f856f0709088b1e24effb9f38b939018f6af9880c1a988a2e42fb13c35
[root@localhost ~]# docker run -d -p 80 -v ~/index.html:/usr/share/nginx/html/index.html --name "cklng3" nginx
46c536bc8eeacb073f84cccef9c217edd8196e431b033f8c1182233aa02731df　　容器进程：
# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
46c536bc8eea        nginx               "nginx -g 'daemon of…"   5 seconds ago       Up 3 seconds        0.0.0.0:32771->80/tcp    cklng3
4e8699f856f0        nginx               "nginx -g 'daemon of…"   8 seconds ago       Up 7 seconds        0.0.0.0:32770->80/tcp    cklng2
75cb89bb9430        nginx               "nginx -g 'daemon of…"   14 seconds ago      Up 13 seconds       0.0.0.0:32769->80/tcp    cklng1　　访问三个容器：
# curl http://127.0.0.1:32771
There is nothing here
# curl http://127.0.0.1:32770
There is nothing here
# curl http://127.0.0.1:32769
There is nothing here
#结果一致　　#修改源
# echo "it's changed" > index.html
# curl http://127.0.0.1:32769      
it's changed
# curl http://127.0.0.1:32770
it's changed
# curl http://127.0.0.1:32771
it's changed　　2.2.创建一个volme容器
　　参数说明：
　　--volumes-fromMount volumes from the specified container(s) #挂载volume从指定的容器
　　2.2.1.先创建一个volume容器
# docker create --name ckl_data -v ~/index.html:/usr/share/nginx/html/index -v /data/ckl/testdir centos
a1bb53fa787c470611e5ebd9fd06c399447f3fdf18442eba08ae1b745d63a70c　　#查看创建容器volume详情：
# docker inspect a1bb53fa787c
...
"Mounts": [
            {
                "Type": "bind",
                "Source": "/root/index.html",  #挂载源1
                "Destination": "/usr/share/nginx/html/index",  #挂载点1
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "volume",
                "Name": "e78b4894d0f13c2ab68d362728dd101dc3b3a55666dd5978a204f30731b4f9a6",
                "Source": "/var/lib/docker/volumes/e78b4894d0f13c2ab68d362728dd101dc3b3a55666dd5978a204f30731b4f9a6/_data", #随机挂载源2
                "Destination": "/data/ckl/testdir",  #挂载点2
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],
....　　2.2.2.创建三个容器，指定需要挂载的容器
# docker run -d --name "cklcent1" --volumes-from ckl_data nginx
480ebd88ea200f23bb0f0ac336fc7183a81832bdfcd40ea02bc2902fd980ae3d
# docker run -d --name "cklcent2" --volumes-from ckl_data nginx
9e4a4095722595dc196b5e39c10ee970067855970e69ef571ad0e2a118f461a2
# docker run -d --name "cklcent3" --volumes-from ckl_data nginx
0a58aea9bd47895d9cf8c000f9d1f604f14970c47b1cb72e5d0f2015568de3d1　　2.2.3.查看容器内容：
# docker exec -it 0a58aea9bd47 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"
it's changed
# docker exec -it 9e4a40957225 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"            
it's changed
# docker exec -it 480ebd88ea20 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"            
it's changed　　进入挂载源，新增文件，测试：
# cd /var/lib/docker/volumes/e78b4894d0f13c2ab68d362728dd101dc3b3a55666dd5978a204f30731b4f9a6/_data
[root@localhost _data]# touch ckl.log　　#已经共享的目录，文件一致
#  docker exec -it 0a58aea9bd47 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"
it's changed
ckl.log
# docker exec -it 9e4a40957225 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"
it's changed
ckl.log
#  docker exec -it 480ebd88ea20 /bin/bash -c "cat  /usr/share/nginx/html/index && ls /data/ckl/testdir"
it's changed
ckl.log　　#也可以制作一个容器挂载镜像，文件放在容器里，新创建的容器指定挂载容器，不依赖于主机。