moby / moby/libnetwork

Fix --iptables=false for Docker Swarm

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Dominant language
Go
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Forks
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Description

In service_linux.go below functions uses IPTables APIs that might create/update IPChain.
fwMarker()
redirector()
programIngress()

If --iptables=false is set dockerd should not create any iptables rules or chains

https://github.com/docker/libnetwork/pull/2339 fixes part of the issue by checking the above flag before creating the DOCKER-USER chain

Raising this issue to track the fix for docker service

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start in service_linux.go by reading fwMarker(), redirector(), and programIngress(), then trace how the --iptables flag reaches these entry points. The fix is complete when docker service with --iptables=false creates no iptables rules or chains; the issue mentions no specific test to run.

Written by the indexing model from the issue text.

Assessment

Tech stack
docker, go
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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