docker to modify the storage directory of the mirror container

Recently, I met a problem on my way to learn docker. I looked up 1 piece of information on the Internet and left a note

By default, the default location for Docker images and containers is: /var/lib/docker

We will not give a large general root under partition. There are two solutions to this problem:

1. Mount the large partition to /var/lib/docker

1 generally choose to establish logical partition lvm to facilitate the later expansion of the collective.

Create a new partition and format it

[root@localhost lib]# lvcreate -L 300G lv_docker vg_home 
[root@localhost lib]# mkfs.ext4 /dev/vg_home/lv__docker

Mount the new partition to a temporary hardpoint

[root@localhost lib]# mkdir /mnt/docker 
[root@localhost lib]# mount /dev/vg_home/lv_docker /mnt/docker/

After stopping the docker service, copy the data under /var/lib/docker to the temporary mount point

[root@localhost lib]# service docker stop 
[root@localhost lib]# cp -r /var/lib/docker/* /mtn/docker

Modify/var/lib/docker/var/lib/docker bak, and create/var/lib/docker

[root@localhost lib]# mv /var/lib/docker{,.bak} 
[root@localhost lib]# mkdir /var/lib/docker

Mount the new partition to /var/lib/docker and set the boot mount automatically

[root@localhost lib]# mount /dev/vg_home/lv_docker /var/lib/docker 
[root@localhost lib]# vim /etc/fstab

--- 
 /dev/vg_home/lv_docker /var/lib/docker ext4 defaults 0 0
----

Start the Docker service to check that the Docker service is available and that the data is complete

[root@localhost lib]# /etc/init.d/docker start
[root@localhost lib]# docker images 
[root@localhost lib]# docker ps -a

After unloading the temporary hardpoints, delete/var lib/docker bak

[root@localhost lib]# umount /mnt/docker 
[root@localhost lib]# rm -rf /var/lib/docker.bak

2. Modify the storage path of the image and container

In the Docker service profile /etc/sysconfig/docker To modify the parameters of the image and container storage path, add:

other_args="--graph=/data/docker"

Specific steps are as follows:

Discontinue Docker service

[root@localhost lib]# service docker stop

Back up the data to a new storage path

[root@localhost lib]# cp -rf /var/lib/docker /data/

Modify the backup /var/lib/docker path

[root@localhost lib]# mkdir /mnt/docker 
[root@localhost lib]# mount /dev/vg_home/lv_docker /mnt/docker/

0

Start the Docker service

[root@localhost lib]# mkdir /mnt/docker 
[root@localhost lib]# mount /dev/vg_home/lv_docker /mnt/docker/

1

Test the Docker service

[root@localhost lib]# mkdir /mnt/docker 
[root@localhost lib]# mount /dev/vg_home/lv_docker /mnt/docker/

2