docker limit log file size and number

After recently used docker found a terrible problem, that is, create a container, will occupy disk space, an outrage.

Through access to the site and found that the problem can be avoided.

Terrible path: / var / lib / Docker / Containers

principle:

docker container to create the default is to generate a string of numbers, the system creates a directory for the string of numbers. There are * json.log log files, log container.

If the profile does not modify the docker log, a log generated by default, for example here to 100M, three files retained.

* Json.log generates a first file, the size of the log to 100M, the system will automatically * json.log file, write * json.log.1 inside

Wait until * json.log file again to the 100M, the system will automatically * json.log file, write * json.log.1 inside, and * json.log.1 file write * json.log.2 inside.

And so on

I have been tested here, to which a delete files * json.log.2, after a while will generate * json.log.2 file, if only to retain * json.log.2 file, * json.log.1 log delete the file, the system will now * json.log.1 written to the log file contents * json.log.2 inside.

First, modify configuration files docker log

　　I'm here to modify, log size 100M, retained three documents

vi /etc/docker/daemon.json
{"registry-mirrors": ["https://registry.docker-cn.com"],
  "log-driver":"json-file",
  "log-opts": {"max-size":"100m", "max-file":"3"}
}