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Why mount /etc/timezone and /etc/localtime in containers? (lemmy.world)

submitted 2 weeks ago by [email protected] to c/[email protected]

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A lot of selfhosted containers instructions contain volume mounts like:

docker run ...
  -v /etc/timezone:/etc/timezone:ro \
  -v /etc/localtime:/etc/localtime:ro \
  ...

but all the times I tried to skip those mounts everything seemed to work perfectly.

Are those mounts only necessary in specific cases?

PS:

Bonus question: other containers instructions say to define the TZ variable. Is that only needed when one wants a container to use a different timezone than the host?

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[–] [email protected] 17 points 2 weeks ago

Most containers default to UTC, and depending what you're running, that may be fine.

I only mount /etc/timezone / /etc/localtime if I'm running a container where it needs to be on the same timezone as the host (DB containers, anything where I want the logs in local time, etc). Not all containers use the TZ env var, so bind mounting the timezone files from the host is a guaranteed way to sync them.