The solution of insufficient disk space of docker in Ubuntu

First, check the docker location:

docker info

Stop docker service

systemctl stop docker

Look at the high capacity location and create a transfer directory on it

df -h
mkdir -p /home/docker

Take/home/docker as an example. I will transfer the docker of/var/lib/docker to here later.

Migrate the files in/var/lib/docker directory to the target location

sudo rsync -avz /var/lib/docker /home/docker

Create a new/etc/docker/daemon.json file and edit it

There is no such file by default, so you can create and edit it directly with vim
sudo vim /etc/docker/daemon.json
Here is how to use vim.
Press i to enter the insert state and copy the following list into the file
{
  "graph":"/docker/lib/docker"

}
Press Esc to exit the insert state, then press shift+:
and then press wq! Enter to force save the file.
PS. If you encounter any swap file already open when inserting, then sudo rm file name to delete the file

Reload docker and restart docker

systemctl daemon-reload && systemctl restart docker

Check whether the docker is changed to a new directory

docker info

Delete old docker directory

rm -rf /var/lib/docker


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