5 - 03 - Volume Container

Volume container which is a container that can provide volume for other container.
Volume container can provide bind mount or docker managed volume.
In this lab, I will show both.

1. Creating a volume container called VC_Data.

peter@peter-KVM:~$ sudo docker create --name VC_Data \
> -v ~/htdocs:/usr/local/apache2/htdocs \
> -v /other/useful/tools \
> busybox
5086288f2b1062e4815c692c7b2ed63dd42d61cad062d9b3f8666fc19f022d5b
peter@peter-KVM:~$ 

2. Verify. you can see two mount types.

peter@peter-KVM:~$ docker inspect VC_Data 
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/home/peter/htdocs",
                "Destination": "/usr/local/apache2/htdocs",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "volume",
                "Name": "16f959d6cdb2b83f962ac0507650b16df93c8e954bb60dc30862d45d7571e27d",
                "Source": "/var/lib/docker/volumes/16f959d6cdb2b83f962ac0507650b16df93c8e954bb60dc30862d45d7571e27d/_data",
                "Destination": "/other/useful/tools",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

3. Other containers can use this volume container.

peter@peter-KVM:~$ docker run --name WEB_1 -d -p 80 --volumes-from VC_Data httpd
9873cb7042b40083f519ffe648ddcbba73c286bd62ea8bc035de0a0dd43c9c22
peter@peter-KVM:~$ 
peter@peter-KVM:~$ docker run --name WEB_2 -d -p 80 --volumes-from VC_Data httpd
5ca16137a5d3cd67e950eb10fafa4ed5eef2f971b35ce40ba1d55facdfd8c0de
peter@peter-KVM:~$
peter@peter-KVM:~$ docker inspect WEB_1
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/home/peter/htdocs",
                "Destination": "/usr/local/apache2/htdocs",
                "Mode": "",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "volume",
                "Name": "16f959d6cdb2b83f962ac0507650b16df93c8e954bb60dc30862d45d7571e27d",
                "Source": "/var/lib/docker/volumes/16f959d6cdb2b83f962ac0507650b16df93c8e954bb60dc30862d45d7571e27d/_data",
                "Destination": "/other/useful/tools",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

4. Verify. You can see. When I change the docker host file, the WEB_1 and WEB_2 file also will be changed.

peter@peter-KVM:~$ docker ps 
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS                   NAMES
5ca16137a5d3        httpd               "httpd-foreground"   5 minutes ago       Up 5 minutes        0.0.0.0:32769->80/tcp   WEB_2
9873cb7042b4        httpd               "httpd-foreground"   6 minutes ago       Up 6 minutes        0.0.0.0:32768->80/tcp   WEB_1
peter@peter-KVM:~$ 
peter@peter-KVM:~$ sudo echo "This content is from a volume container" > ~/htdocs/index.html 
[sudo] password for peter: 
peter@peter-KVM:~$ 
peter@peter-KVM:~$ curl 127.0.0.1:32768
This content is from a volume container
peter@peter-KVM:~$ 
peter@peter-KVM:~$ curl 127.0.0.1:32769
This content is from a volume container
peter@peter-KVM:~$ 

最初發表 / 最後更新: 2019.06.02 / 2019.06.02