Docker基础学习之数据管理

[root@localhost ~]# docker ps
CONTAINER ID  IMAGE    COMMAND    CREATED    STATUS    PORTS    NAMES
fb45150dbc21  centos    "bash"    8 minutes ago  Up 8 minutes       cent_testv
3222c7c5c456  centos    "bash"    52 minutes ago  Up 52 minutes       sick_albattani
e136b27a8e17  centos    "bash"    58 minutes ago  Up 58 minutes       tender_euclid

[root@localhost ~]# docker exec -it cent_testv bash
[root@fb45150dbc21 /]# df -h
Filesystem                       Size Used Avail Use% Mounted on
/dev/mapper/docker-253:0-1447735-fb45150dbc218e71ff07eca44be3603e004e01b94effcca14c2bd8b3a998f096 9.8G 231M 9.0G 3% /
tmpfs                        936M  0 936M 0% /dev
shm                         64M  0 64M 0% /dev/shm
/dev/mapper/VolGroup-lv_root                  35G 6.0G 28G 18% /data
[root@fb45150dbc21 /]# ls /data/
[root@fb45150dbc21 /]# exit
exit
[root@localhost ~]# ls /data/
1.txt 2.txt 3.txt

其他容器挂载该数据卷

[root@localhost ~]# docker run -itd --volumes-from cent_testv centos bash
0a80861145c9a2627618a78db2b7225eba64137d4664d3706e02c1c623cde5e3

注意：使用–volumes-from参数所挂载数据卷的容器自身并不需要保持在运行状态

[root@localhost ~]# docker ps
CONTAINER ID  IMAGE    COMMAND    CREATED    STATUS    PORTS    NAMES
0a80861145c9  centos    "bash"    3 seconds ago  Up 2 seconds       mad_carson
fb45150dbc21  centos    "bash"    14 minutes ago  Up 14 minutes       cent_testv
3222c7c5c456  centos    "bash"    58 minutes ago  Up 58 minutes       sick_albattani
e136b27a8e17  centos    "bash"    About an hour ago Up About an hour      tender_euclid
[root@localhost ~]# docker exec -it 0a8086 bash
[root@0a80861145c9 /]# df -h
Filesystem                       Size Used Avail Use% Mounted on
/dev/mapper/docker-253:0-1447735-0a80861145c9a2627618a78db2b7225eba64137d4664d3706e02c1c623cde5e3 9.8G 231M 9.0G 3% /
tmpfs                        936M  0 936M 0% /dev
shm                         64M  0 64M 0% /dev/shm
/dev/mapper/VolGroup-lv_root                  35G 6.0G 28G 18% /data

[root@0a80861145c9 /]# touch /data/fight.txt
[root@0a80861145c9 /]# exit
exit
[root@localhost ~]# docker exec -it cent_testv bash
[root@fb45150dbc21 /]# ls /data/
fight.txt
[root@fb45150dbc21 /]# exit
exit

利用数据卷容器迁移数据

数据卷的备份

[root@localhost ~]# docker run -itd --volumes-from cent_testv -v /vol_data_backup/:/backup centos bash
4f5bf6f33f2c78197e54e5145824e98bf89d802376e83019c2913b336fbd9d20

首先我们需要使用cent_testv数据卷新开一个容器，同时我们还需要把本地的/vol_data_backup/目录挂载到该容器的/backup下，这样在容器中/backup目录里面新建的文件我们就可以直接在/vol_data_backup/目录中看到了。 然后再把/data/目录下面的文件打包到成data.tar文件放到/backup目录下面。