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feat: add Kubernetes backend (#1260)

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Adds a Kubernetes backend. A `name:kubernetes://image` label runs the job as one pod through the Kubernetes API, with services as containers of the same pod. Step env is exported by a script sent over exec stdin, keeping it out of the pod spec and process arguments, and service env goes into a per-job Secret. Docker actions and container options are rejected. See `docs/kubernetes.md`.

Operators shape job pods with `kubernetes.pod_template`, with per-label `pod_templates` merged in `runs-on` order and a `$services` entry for service containers. The idle cleanup removes pods and Secrets a runner left behind.

The client calls the Kubernetes API directly and runs step commands over `coder/websocket` (same dependency used in gitea) instead of pulling in the heavyweight `kubernetes/client-go`. Includes an e2e test against k3s.

Replaces: https://gitea.com/gitea/runner/pulls/1000
Fixes: https://gitea.com/gitea/runner/issues/31

Assisted-by: Claude Code:claude-opus-5-5
Co-authored-by: Zettat123 <[email protected]>
Co-authored-by: bircni <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1260
Reviewed-by: Lunny Xiao <[email protected]>
Reviewed-by: Zettat123 <[email protected]>
Co-authored-by: silverwind <[email protected]>
This commit is contained in:
silverwindZettat123bircni
 authored and Lunny Xiao committed 2026-10-01 06:59:15 +00:00
1 parent 07ca4bfa7f
commit 0cedd98051
35 files changed
+2012 -226
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internal/app/cmd/exec.go
+1 -1
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@@ -618,7 +618,7 @@ func loadExecCmd(ctx context.Context) *cobra.Command {
execCmd.PersistentFlags().BoolVarP(&execArg.noSkipCheckout, "no-skip-checkout", "", false, "Do not skip actions/checkout")
execCmd.PersistentFlags().BoolVarP(&execArg.debug, "debug", "d", false, "enable debug log")
execCmd.PersistentFlags().BoolVarP(&execArg.dryrun, "dryrun", "n", false, "dryrun mode")
execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", config.DefaultImage, "Docker image to use. Use \"-self-hosted\" to run directly on the host.")
execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", config.DefaultImage, "Docker image to use. Use \"kubernetes://<image>\" to run it as a pod, \"-self-hosted\" to run directly on the host.")
execCmd.PersistentFlags().StringVarP(&execArg.toolCacheMode, "tool-cache-mode", "", config.ToolCacheModeNone, "What to mount at RUNNER_TOOL_CACHE: none, or shared to reuse one tool cache across runs")
execCmd.PersistentFlags().StringVarP(&execArg.network, "network", "", "", "Specify the network to which the container will connect")
execCmd.PersistentFlags().StringVarP(&execArg.githubInstance, "gitea-instance", "", "", "Gitea instance to use.")