Docker容器数据卷volumes-from
定义4个终端：
- 终端host
- 终端container dc01
- 终端container dc02
- 终端container dc03
各个容器之间的关系：
1、启动一个父容器dc01
启动一个父容器dc01，并在 dataVolumeContainer2 新增内容。
命令格式：docker run -it --name dc01 zzyy/centos
操作步骤如下：
终端container dc01：
创建并启动dc01容器，并在 dataVolumeContainer2 目录中添加 dc01.txt
[root@localhost mydocker]# docker run -it --name dc01 zzyy/centos
[root@3caa375ebfd9 /]# ll
total 12
-rw-r--r--. 1 root root 12030 Oct 6 19:15 anaconda-post.log
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 bin -> usr/bin
drwxr-xr-x. 2 root root 6 Nov 27 03:02 dataVolumeContainer1
drwxr-xr-x. 2 root root 6 Nov 27 03:02 dataVolumeContainer2
drwxr-xr-x. 5 root root 360 Nov 27 03:02 dev
drwxr-xr-x. 1 root root 66 Nov 27 03:02 etc
drwxr-xr-x. 2 root root 6 Apr 11 2018 home
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 lib -> usr/lib
lrwxrwxrwx. 1 root root 9 Oct 6 19:14 lib64 -> usr/lib64
drwxr-xr-x. 2 root root 6 Apr 11 2018 media
drwxr-xr-x. 2 root root 6 Apr 11 2018 mnt
drwxr-xr-x. 2 root root 6 Apr 11 2018 opt
dr-xr-xr-x. 264 root root 0 Nov 27 03:02 proc
dr-xr-x---. 2 root root 114 Oct 6 19:15 root
drwxr-xr-x. 10 root root 130 Oct 6 19:15 run
lrwxrwxrwx. 1 root root 8 Oct 6 19:14 sbin -> usr/sbin
drwxr-xr-x. 2 root root 6 Apr 11 2018 srv
dr-xr-xr-x. 13 root root 0 Nov 27 02:53 sys
drwxrwxrwt. 7 root root 132 Oct 6 19:15 tmp
drwxr-xr-x. 13 root root 155 Oct 6 19:14 usr
drwxr-xr-x. 18 root root 238 Oct 6 19:14 var
[root@3caa375ebfd9 /]# cd dataVolumeContainer2/
[root@3caa375ebfd9 dataVolumeContainer2]# ls
[root@3caa375ebfd9 dataVolumeContainer2]# echo "container dc01 add"> dc01.txt
[root@3caa375ebfd9 dataVolumeContainer2]# ls
dc01.txt
[root@3caa375ebfd9 dataVolumeContainer2]# cat dc01.txt
container dc01 add
[root@3caa375ebfd9 dataVolumeContainer2]#
终端host：
验证容器启动情况
[root@localhost _data]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3caa375ebfd9 zzyy/centos "/bin/sh -c /bin/bash" 22 minutes ago Up 22 minutes dc01
[root@localhost _data]#
2、dc02/dc03继承自dc01
–volumes-form
dc02/dc03分别在dataVolumeContainer2各自新增内容
命令格式
dc02的 格式：
docker run -it --name dc02 --volumes-from dc01 zzyy/centos
dc03的格式：
docker run -it --name dc03 --volumes-from dc01 zzyy/centos
操作步骤如下：
终端container dc02：
创建并启动dc02容器，并在 dataVolumeContainer2 目录中添加 dc02.txt
[root@localhost java]# docker run -it --name dc02 --volumes-from dc01 zzyy/centos
[root@7dbdb68f3e73 /]# ll
total 12
-rw-r--r--. 1 root root 12030 Oct 6 19:15 anaconda-post.log
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 bin -> usr/bin
drwxr-xr-x. 2 root root 6 Nov 27 03:02 dataVolumeContainer1
drwxr-xr-x. 2 root root 22 Nov 27 03:09 dataVolumeContainer2
drwxr-xr-x. 5 root root 360 Nov 27 03:17 dev
drwxr-xr-x. 1 root root 66 Nov 27 03:17 etc
drwxr-xr-x. 2 root root 6 Apr 11 2018 home
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 lib -> usr/lib
lrwxrwxrwx. 1 root root 9 Oct 6 19:14 lib64 -> usr/lib64
drwxr-xr-x. 2 root root 6 Apr 11 2018 media
drwxr-xr-x. 2 root root 6 Apr 11 2018 mnt
drwxr-xr-x. 2 root root 6 Apr 11 2018 opt
dr-xr-xr-x. 270 root root 0 Nov 27 03:17 proc
dr-xr-x---. 2 root root 114 Oct 6 19:15 root
drwxr-xr-x. 10 root root 130 Oct 6 19:15 run
lrwxrwxrwx. 1 root root 8 Oct 6 19:14 sbin -> usr/sbin
drwxr-xr-x. 2 root root 6 Apr 11 2018 srv
dr-xr-xr-x. 13 root root 0 Nov 27 02:53 sys
drwxrwxrwt. 7 root root 132 Oct 6 19:15 tmp
drwxr-xr-x. 13 root root 155 Oct 6 19:14 usr
drwxr-xr-x. 18 root root 238 Oct 6 19:14 var
[root@7dbdb68f3e73 /]# cd d
dataVolumeContainer1/ dataVolumeContainer2/ dev/
[root@7dbdb68f3e73 /]# cd cd dataVolumeContainer2/
bash: cd: cd: No such file or directory
[root@7dbdb68f3e73 /]# cd dataVolumeContainer2/
[root@7dbdb68f3e73 dataVolumeContainer2]# ls
dc01.txt
[root@7dbdb68f3e73 dataVolumeContainer2]# cat dc01.txt
container dc01 add
[root@7dbdb68f3e73 dataVolumeContainer2]#
[root@7dbdb68f3e73 dataVolumeContainer2]# echo "container dc02" > dc02.txt
[root@7dbdb68f3e73 dataVolumeContainer2]# ls
dc01.txt dc02.txt
[root@7dbdb68f3e73 dataVolumeContainer2]#
终端container dc03：
创建并启动dc03容器，并在 dataVolumeContainer2 目录中添加 dc03.txt
[root@localhost java]# docker run -it --name dc03 --volumes-from dc01 zzyy/centos
[root@4dfdba337ef2 /]# ls
anaconda-post.log bin dataVolumeContainer1 dataVolumeContainer2 dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
[root@4dfdba337ef2 /]# ll
total 12
-rw-r--r--. 1 root root 12030 Oct 6 19:15 anaconda-post.log
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 bin -> usr/bin
drwxr-xr-x. 2 root root 6 Nov 27 03:02 dataVolumeContainer1
drwxr-xr-x. 2 root root 22 Nov 27 03:09 dataVolumeContainer2
drwxr-xr-x. 5 root root 360 Nov 27 03:33 dev
drwxr-xr-x. 1 root root 66 Nov 27 03:33 etc
drwxr-xr-x. 2 root root 6 Apr 11 2018 home
lrwxrwxrwx. 1 root root 7 Oct 6 19:14 lib -> usr/lib
lrwxrwxrwx. 1 root root 9 Oct 6 19:14 lib64 -> usr/lib64
drwxr-xr-x. 2 root root 6 Apr 11 2018 media
drwxr-xr-x. 2 root root 6 Apr 11 2018 mnt
drwxr-xr-x. 2 root root 6 Apr 11 2018 opt
dr-xr-xr-x. 272 root root 0 Nov 27 03:33 proc
dr-xr-x---. 2 root root 114 Oct 6 19:15 root
drwxr-xr-x. 10 root root 130 Oct 6 19:15 run
lrwxrwxrwx. 1 root root 8 Oct 6 19:14 sbin -> usr/sbin
drwxr-xr-x. 2 root root 6 Apr 11 2018 srv
dr-xr-xr-x. 13 root root 0 Nov 27 02:53 sys
drwxrwxrwt. 7 root root 132 Oct 6 19:15 tmp
drwxr-xr-x. 13 root root 155 Oct 6 19:14 usr
drwxr-xr-x. 18 root root 238 Oct 6 19:14 var
[root@4dfdba337ef2 /]# cd dataVolumeContainer2/
[root@4dfdba337ef2 dataVolumeContainer2]# ls
dc01.txt
[root@4dfdba337ef2 dataVolumeContainer2]# ls
dc01.txt dc02.txt
[root@4dfdba337ef2 dataVolumeContainer2]# echo "container dc03 addd" > dc03.txt
[root@4dfdba337ef2 dataVolumeContainer2]# ls
dc01.txt dc02.txt dc03.txt
[root@4dfdba337ef2 dataVolumeContainer2]#
终端host：
查看容器运行情况：
[root@localhost _data]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4dfdba337ef2 zzyy/centos "/bin/sh -c /bin/bash" 3 minutes ago Up 3 minutes dc03
7dbdb68f3e73 zzyy/centos "/bin/sh -c /bin/bash" 19 minutes ago Up 19 minutes dc02
3caa375ebfd9 zzyy/centos "/bin/sh -c /bin/bash" 34 minutes ago Up 34 minutes dc01
[root@localhost _data]#
dc01、dc02、dc03运行正常。
3、回到dc01可以看到02/03各自添加的都能共享
终端container dc01：
[root@3caa375ebfd9 dataVolumeContainer2]# ls
dc01.txt dc02.txt dc03.txt
[root@3caa375ebfd9 dataVolumeContainer2]#
4、删除dc01,dc02修改后，dc03可否访问
终端host：
删除dc01
[root@localhost _data]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4dfdba337ef2 zzyy/centos "/bin/sh -c /bin/bash" 2 hours ago Up 2 hours dc03
7dbdb68f3e73 zzyy/centos "/bin/sh -c /bin/bash" 3 hours ago Up 3 hours dc02
3caa375ebfd9 zzyy/centos "/bin/sh -c /bin/bash" 3 hours ago Up 2 hours dc01
[root@localhost _data]# docker rm -f 3caa375ebfd9
3caa375ebfd9
[root@localhost _data]#
终端container dc02：
在dc02中添加新文件，并且可以看见dc01虽然被删除了，但是dc01的创建的文件还在。
[root@7dbdb68f3e73 dataVolumeContainer2]# ls
dc01.txt dc02.txt dc03.txt
[root@7dbdb68f3e73 dataVolumeContainer2]# echo "container dc02 add 22" > dc02_update.txt
[root@7dbdb68f3e73 dataVolumeContainer2]# ls
dc01.txt dc02.txt dc02_update.txt dc03.txt
[root@7dbdb68f3e73 dataVolumeContainer2]#
终端container dc03：
dc01.txt 还在，dc01.txt中的内容也能获取。
新创建的 dc02_update.txt 也在。
[root@4dfdba337ef2 dataVolumeContainer2]# ls
dc01.txt dc02.txt dc02_update.txt dc03.txt
[root@4dfdba337ef2 dataVolumeContainer2]# cat dc01.txt
container dc01 add
[root@4dfdba337ef2 dataVolumeContainer2]#
5、删除dc02后，dc03可否访问
6、新建dc04，继承dc03后，再删除dc03
结论：容器之间配置信息的传递，数据卷的生命周期一直持续到没有容器使用它为止。