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adding note about runner GC on task pod #8829

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merged 5 commits into from
Jul 5, 2024
Merged

adding note about runner GC on task pod #8829

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41b9404
adding note about runner GC on task pod
soulchips Jun 26, 2024
fc26092
Update container-runner.adoc
soulchips Jun 27, 2024
5a1d97d
Update jekyll/_cci2/container-runner.adoc
soulchips Jul 5, 2024
9b53332
Update jekyll/_cci2/container-runner.adoc
soulchips Jul 5, 2024
6308466
Merge branch 'master' into onprem-276/runner-garbage-collection-docs
rosieyohannan Jul 5, 2024
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4 changes: 3 additions & 1 deletion jekyll/_cci2/container-runner.adoc
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Expand Up @@ -388,7 +388,9 @@ NOTE: Cluster-wide permissions are used by container runner to autodetect the OS
[#garbage-collection]
== Garbage collection

Each container runner has a garbage collector which will ensure any pods and secrets with the label `app.kubernetes.io/managed-by=circleci-container-agent` left dangling in the cluster are removed. By default this will remove all jobs older than five hours and five minutes. This can be shortened or lengthened via the `agent.kubeGCThreshold` parameter. However, if you do shorten the garbage collection (GC) frequency, also shorten the max task run time via the `agent.maxRunTime` parameter to be a value smaller than the new GC frequency. Otherwise a running task pod could be removed by the GC.
Each container runner has a garbage collector which will ensure any pods and secrets with the label `app.kubernetes.io/managed-by=circleci-container-agent` left dangling in the cluster are removed. By default this will remove all jobs older than five hours and five minutes. This can be shortened or lengthened via the `agent.gc.threshold` parameter. However, if you do shorten the garbage collection (GC) frequency, also shorten the max task run time via the `agent.maxRunTime` parameter to be a value smaller than the new GC frequency. Otherwise a running task pod could be removed by the GC.
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In addition, GC may remove some objects sooner than this threshold. Task pods have a liveness probe which checks for a running task-agent process. Once a task completes or fails, the task-agent process will stop running and the liveness probe will fail which will trigger GC.
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Container runner will drain and restart cleanly when sent a termination signal. Container runner will not automatically attempt to launch a task that fails to start. This can be done in the CircleCI web app.

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