Logrotate is a Docker container based on Alpine Linux. With our Docker Hosting Services, Bobcares offers solutions to your queries.

Docker Logrotate On Alpine Linux

Logrotate is a tool that makes managing systems with lots of log files easier. It enables the log files to rotate, compress, delete, and mail automatically. Each log file will process on a daily, weekly, or monthly basis depending on its size.

Logrotate usually runs as a cron task every day. If the log’s size is the criterion and logrotate run more than once each day, or if the -f or —force option is being used, it won’t change a log more than once in a single day. Docker logrotate is a docker container based on Alpine Linux with logrotate.

How to set up Docker Logrotate?

Just mount the logs into the container at /logs, and we can optionally set up some logrotation features with the below environment variables:

1. LOGROTATE_FILE_PATTERN: File pattern for the /logs directory that has the logs that will rotate by logrotate.

2. LOGROTATE_TRUNCATE: Use either copy truncate or nocopytruncate to change the way that logrotate truncates data.

3. LOGROTATE_COMPRESS: Use nocompress or compress as suitable as compression behavior for rotated files.

4. LOGROTATE_ROTATE: Logrotate’s rotate option.

5. LOGROTATE_SIZE: The logrotate size option.

Mount a logrotate.conf file located at /etc/logrotate.conf into the container if we want to use a different logrotate configuration. If we submit our own logrotate configuration file, the mentioned environment variables have no impact. Logrotate runs every 15 minutes by default.

The environment option LOGROTATE CRON allows us to override the cron schedule. Use a predefined period from Alpine Linux (15 minutes, an hour, a day, a week, or a month), or provide a cron schedule expression like 5 4 * * *. (at 04:05 every day). Consider using a program like a crontab guru if we are unsure of the syntax for the cron schedule expression. This image is much easier to use and maintain than the no longer supported blacklabelops/logrotate.

Usage

docker run ghcr.io/linkyard/logrotate
docker run eu.gcr.io/linkyard-191615/linkyard-cloud/logrotate

Example

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Conclusion

To sum up, our article briefly notes Docker logrotate based on Alpine Linux.