b38f1b901f
Automatic merge from submit-queue (batch tested with PRs 60214, 58762, 59898, 59897, 60204). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Add CRI container log rotation support Fixes https://github.com/kubernetes/kubernetes/issues/58823. This PR: 1) Added `pkg/kubelet/logs/container_log_manager.go` which manages and rotates container logs. 2) Added a feature gate `CRIContainerLogRotation` to enable the alpha feature. And 2 kubelet flags `--container-log-max-size` and `--container-log-max-files` to configure the rotation behavior. 3) Added unit test and node e2e test for container log rotation. Note that: 1) Container log manager only starts when the container runtime is `remote` (not docker), because we can't implement `ReopenContainerLog` for docker. 2) Rotated logs are compressed with `gzip`. 2) The latest rotated log is not compressed. Because fluentd may still be reading the file right after rotation. 3) `kubectl logs` still doesn't support log rotation. This is not a regression anyway, it doesn't support log rotation for docker log today. We'll probably fix this in the future. (Issue: https://github.com/kubernetes/kubernetes/issues/59902) An example of container log directory with `--container-log-max-files=3`: ```console $ ls -al /var/log/pods/57146449-11ec-11e8-90e1-42010af00002 total 592 drwxr-xr-x 2 root root 4096 Feb 15 01:07 . drwxr-xr-x 3 root root 12288 Feb 15 01:06 .. -rw-r----- 1 root root 176870 Feb 15 01:07 log-container_0.log -rw-r--r-- 1 root root 40239 Feb 15 01:07 log-container_0.log.20180215-010737.gz -rw-r----- 1 root root 365996 Feb 15 01:07 log-container_0.log.20180215-010747 ``` /assign @mtaufen for the config change. /assign @dashpole @crassirostris for the log change. /assign @feiskyer for CRI related change. /cc @yujuhong @feiskyer @abhi @mikebrow @mrunalp @runcom /cc @kubernetes/sig-node-pr-reviews @kubernetes/sig-instrumentation-pr-reviews **Release note**: ```release-note [Alpha] Kubelet now supports container log rotation for container runtime which implements CRI(container runtime interface). The feature can be enabled with feature gate `CRIContainerLogRotation`. The flags `--container-log-max-size` and `--container-log-max-files` can be used to configure the rotation behavior. ```
Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts; providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
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