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There are various log drivers available for Docker but it looks like all of them persist the logs to disk.

To reduce disk usage I would like to keep the logs only in memory (and limited to a certain size).

I could use log driver none but I believe it immediately discards all log messages and sometimes it is still helpful to look at the currently produced logs without having to restart the container to switch to a different log driver.

Is this possible?

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One solution could be, I never tried, is to mount a memory filesystem (tmpfs) and let docker log to that directory with syslog

create a memory filesystem:

https://docs.oracle.com/cd/E18752_01/html/817-5093/fscreate-99040.html

let docker log with syslog:

https://www.simulmedia.com/blog/centralized-docker-logging-with-rsyslog

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