How to clear docker logs

1. Find the Docker container log

On Linux, container logs are generally stored under /var/lib/docker/containers/container_id/. The file ending with json.log (business log) is very large. Check the script docker_log_size.sh for the size of each log file. The content is as follows:

#!/bin/sh
echo "======== docker containers logs file size ========"
logs=$(find /var/lib/docker/containers/ -name *-json.log)
for log in $logs
do
	ls -lh $log
done

Execute the following command:

# chmod +x docker_log_size.sh
# ./docker_log_size.sh

2 , Clean up the Docker container log

If the docker container is running, after using the rm -rf method to delete the log, you will find that the disk space has not been released through the df -h command.

The reason is that in Linux or Unix systems, deleting files through rm -rf or the file manager will unlink (unlink) from the directory structure of the file system. If the file is open (being used by a process), the process will still be able to read the file, and disk space will remain occupied.

The correct method iscat /dev/null > *-json.log, of course you can also delete it through rm -rf and restart docker. Next, provide a log cleaning script clean_docker_log.sh with the following content:

#!/bin/sh
echo "======== start clean docker containers logs ========"
logs=$(find /var/lib/docker/containers/ -name *-json.log)
for log in $logs
do
	echo "clean logs : $log"
	cat /dev/null > $log
done
echo "======== end clean docker containers logs ========

Then execute the following command:

# chmod +x clean_docker_log.sh
# ./clean_docker_log.sh

Recommended tutorial: docker tutorial

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