How to migrate the / var/lib/docker directory of docker

This article introduces the relevant knowledge of "how to migrate the docker / var/lib/docker directory". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Since I came to the company in the morning and found that / var/lib/docker/overlay2 takes up a lot of space, I decided to do some work on / var/lib/docker directory migration.

1. First, you need to stop the docker service.

Systemctl stop docker.service

two。 Use the command df-h to take a look at the disk and find a large space.

3. Create a new directory for docker. I found data here, so the new directory address on my side is / data/docker/lib/.

Mkdir-p / data/docker/lib

Note: the parameter-p ensures that the directory name exists, and if the directory does not exist, create a new one.

4. Start the migration

Rsync-avzP / var/lib/docker / data/docker/lib/

First confirm whether rsync is installed.

Parameter explanation:

-a, the archive mode, represents a recursive transfer and maintains file attributes.

-v to display the details of the rsync process. You can use "- vvvv" to get more details.

-P, displays the progress information of the file transfer. In fact, "- P" = "--partial-- progress", where "--progress" is the one that displays the progress information.

-z, compression during transmission to improve efficiency.

5. Specify a new docker directory

Vim / lib/systemd/system/docker.service

Join in ExecStart:

-- graph=/data/docker/lib/docker

6. Restart docker

Systemctl daemon-reload systemctl restart docker systemctl enable docker

7. Confirm that there is no problem with docker after startup, and delete the old / var/lib/docker/ directory

The work of migrating the docker directory here is over, so be sure to choose the working directory first when installing docker.

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