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fix: stop leaking per-job docker networks (#1124)

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Leaked per-job networks each hold a subnet of the daemon's address pool and nothing reclaimed them, so a host eventually fails every job with `all predefined address pools have been fully subnetted`. This is what CI hit in https://gitea.com/gitea/runner/actions/runs/742177.

- teardown no longer loses a container, and its network with it: a failed `ContainerRemove` was reported as success, a container whose id was never learned was skipped, and the daemon's own `AutoRemove` teardown was raced
- the idle cleanup reclaims what teardown cannot: networks carry `com.gitea.runner.uuid`, so a runner only touches its own, and a cutoff keeps a job starting during the pass out of scope
- pull failures reported mid-stream were discarded, surfacing later as a confusing `No such image`; they now propagate, and fall back to a local copy instead of failing the job
- `NetworkCreate` retries pool exhaustion briefly, then says which knobs to turn
- digest-pinned images are not re-pulled, and removal kills first so it never waits out Podman's stop timeout (measured 10.1s → 0.09s per container)

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Co-authored-by: bircni <bircni@icloud.com>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1124
Reviewed-by: bircni <bircni@icloud.com>
This commit is contained in:
silverwind
2026-07-30 16:25:47 +00:00
parent da4037899a
commit b7a3bf98bc
14 changed files with 395 additions and 64 deletions
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7
README.md
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@@ -283,11 +283,12 @@ Besides `GITEA_INSTANCE_URL` and `GITEA_RUNNER_REGISTRATION_TOKEN`, the image en
For a fuller container-oriented walkthrough, see [examples/docker](examples/docker/README.md).
When `container.bind_workdir` is enabled, stale task workspace directories can be cleaned while the runner is idle:
- directories older than `runner.workdir_cleanup_age` are removed (default: `24h`; set `0` to disable)
- cleanup runs every `runner.idle_cleanup_interval` (default: `10m`; set `0` to disable)
While the runner is idle it cleans up after earlier jobs:
- when `container.bind_workdir` is enabled, stale task workspace directories older than `runner.workdir_cleanup_age` are removed (default: `24h`; set `0` to disable)
- only purely numeric subdirectories under `container.workdir_parent` are treated as task workspaces and may be removed
- cleanup assumes `container.workdir_parent` is not shared across multiple runners
- on runners that use docker, per-job networks left behind by jobs the runner did not live to tear down are removed, identified by the `com.gitea.runner.uuid` label carrying this runner's uuid
- cleanup runs every `runner.idle_cleanup_interval` (default: `10m`; set `0` to disable), and setting either knob to `0` disables all of the above
#### Post-task script (`runner.post_task_script`)