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If you are looking for a log management SAAS solution, consider using Boatswain. They are not only useful when something goes wrong, but they also contain a lot of hidden value. Other than that, logs are an important asset. This can be avoided by the few steps discussed above. The logs are broken down into 1k files SummaryĪlthough the default settings work fine, you never know when the container logs take up all the disk space. The logging driver and options can also be configured using docker-compose. We can specify the logging driver and options in the docker run command. The configuration can also be done on the container level if you do not want to apply it globally. Configure the logging driver for a container

The new configuration will apply to all newly created containers after restart. For more information, please refer to the Docker Docs - Configure logging drivers.Įxecute the following commands to reload the updated daemon.json. The json-file logging driver has a few more options, and we can even change to other logging drivers such as syslog. This can be done by adding the following values in /etc/docker/daemon.json. Setup the log rotation Configure the default logging driver But for the long term, it would be better to setup log rotation. We could setup a cronjob to purge these JSON log files regularly. If this JSON log file takes up a significant amount of the disk, we can purge it using the following command. A large log file in json format Purge the log manually If you leave it unattended, it can take up a large amount of disk space, as shown below. By default, the stdout and stderr of the container are written in a JSON file located in /var/lib/docker/containers//-json.log. We can configure different logging drivers for containers. This article is about setting up log rotation for Docker containers. In many cases, reading logs takes up a large portion of time when debugging. Especially when I’m playing with Docker images from the community, and it doesn’t go the way I expected.

Sometimes working with Docker makes me feel like I’m working with a black box.

By Ying Kit Yuen How to setup log rotation for a Docker container We all need logs!