What's the biggest docker footgun you've experienced? (programming.dev)

submitted 2 years ago by ishanpage@programming.dev to c/devops@programming.dev

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I'll start:

When I was first learning to use Docker, I didn't realize that most tutorials that include a database don't configure the database to persist. Imagine my surprise when I couldn't figure out why the database kept getting wiped!

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[-] vegetaaaaaaa@lemmy.world 1 points 2 years ago

I prefer this method:

{
  "log-driver": "syslog",
  "log-opts": {
    "tag": "docker.{{.Name}}"
  }
}

This way container logs are forwarded to /var/log/syslog, which already contains all other services logs, and has sane rotation rules by default (and it allows rsyslog to manage log forwarding/shipping if needed).

[-] object_Object@programming.dev 1 points 2 years ago

Thanks, good to know! I had no idea about the tags. Looks like there's a lot more variables available.

I just reread the docs on the log drivers - they mentioned that as of docker 20.x local logs now work with all drivers as it buffers the logs locally as well. I think this is probably why I hadn't explored the other drivers before - couldn't use docker-compose logs.

this post was submitted on 01 Jul 2023

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