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

submitted 1 year 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 13 points 1 year ago* (last edited 1 year ago)

Docker swarm does not respect its own compose spec, exposes services on all interfaces and bypasses firewall rules [1], [2]
1 million SLOC daemon running as root [1]
Buggy network implementation, sometimes requires restarting the daemon to release bridges [1]
Requires frequent rebuilds to keep up to date with security patches [1] [2] [3]
No proper support for external config files/templating, not possible to do graceful reloads, requires full restarts/downtime for simple configuration changes [1]
Buggy NAT implementation [1]
Buggy overlay network implementation, causes TCP resets [1]
No support for PID limits/fork bomb protection [1], no support for I/O limits [2]
No sane/safe garbage collection mechanism, docker system prune --all deletes all unused volumes - including named volumes which are unused because the container/swarm service that uses them is stopped at that particular moment for whatever reason. Eats disk space like mad [1] [2]
Requires heavy tooling if you're serious about it (CI, container scanning tools, highly-available registry...) [1], Docker development and infrastructure is fully controlled by Docker Inc. [1] [2] [3] [4] [5] [6]

this post was submitted on 01 Jul 2023

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