Docker cleanup environment operation

Start cleaning carefully!

List unused volumes

docker volume ls -qf dangling=true

Clean up unused volumes

docker volume rm $(docker volume ls -qf dangling=true)

Clean up useless images

docker rmi $(docker images | grep '^<none>' | awk '{print $3}')

Continue cleaning

docker system prune
docker volume prune

The above are enough for use, don’t know other commands!

Additional knowledge: Docker article teaches you how to clean up Docker space to free up disk space

How to clean up the docker directory

The docker directory has filled up the system disk and is difficult to migrate. I want to ask if there is a quick solution. The answer is yes. The following are classic cases I have compiled, which are suitable for production and testing. Write a script to clean up the docker log as follows:

[root@www ~]# cat clean_docker_log_space.log 
#!/bin/bash
docker_log_files=$(find /var/lib/docker/containers/ -name '*-json.log')
docker_logs_size=$(find /var/lib/docker/containers/ -name '*-json.log' | xargs du -sc | tail -1 |awk '{print $1,"K"}')
free -h && sync && echo 1 > /proc/sys/vm/drop_caches #Release system cache echo -e "\033[32mThe docker log total size is $docker_logs_size\033[0m"
 
for log in $docker_log_files
  do
   echo "Now is cleaning docker log,docker core logs:$log"
    cat /dev/null > $log
    systemctl reload docker #Reload the docker service without affecting existing docker
  done 
 
free -h

The results are as follows:

[root@www ~]# ./clean_docker_log_space.log 
       total used free shared buff/cache available
Mem: 976M 598M 112M 6.8M 264M 157M
Swap: 511M 66M 445M
The docker log total size is 80 K
Now is cleaning docker log,docker core logs:/var/lib/docker/containers/7538f077348e3c9722fb90ed4b0a5c3d60d72112e989526767c63d55f5a76f3e/7538f077348e3c9722fb90ed4b0a5c3d60d72112e989526767c63d55f5a76f3e-json.log
Now is cleaning docker log,docker core logs:/var/lib/docker/containers/235d20190027e757a203f1b4d4093335fb92ba515f7a501448c36c1332c622a2/235d20190027e757a203f1b4d4093335fb92ba515f7a501448c36c1332c622a2-json.log
Now is cleaning docker log,docker core logs:/var/lib/docker/containers/685a7af447ce884de1e9bbeb5d4ca0ca99860096f71c33b4f9a4d15a427c5e00/685a7af447ce884de1e9bbeb5d4ca0ca99860096f71c33b4f9a4d15a427c5e00-json.log
       total used free shared buff/cache available
Mem: 976M 599M 176M 6.8M 200M 168M
Swap: 511M 66M 445M
 
[root@www ~]# find /var/lib/docker/containers/ -name '*-json.log' | xargs du -sc | tail -1 |awk '{print $1,"K"}'
0K

It is recommended to add the script to the Linux scheduled task and clean it up once a week. This can ensure that Docker does not generate additional log files.

The production environment is as follows

df -TH docker uses 93% of the system disk

Execute the script clean_docker_log_space.log. After executing the cleanup script, df -TH shows that docker uses 43% of the system disk.

Docker deployment suggestions

Finally, it is recommended that you deploy docker applications in the docker custom configuration directory

#First, mount the disk with the required capacity and select /data as the mount directory
[root@www ~]# mkdir -p /data
#Stop Docker
[root@www ~]# systemctl stop docker
 
#Move data to a new directory [root@www ~]# mv /var/lib/docker /data
#Modify configuration, add --graph /data
[root@www ~]# vim /usr/lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --graph /data 
 
[root@www ~]# systemctl daemon-reload
[root@www ~]# systemctl start docker 
[root@www ~]# systemctl enable docker.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

The above Docker environment cleaning operation is all the content that the editor shares with you. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM.

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