cluster/clustercfg: rewrite it in Go
This replaces the old clustercfg script with a brand spanking new
mostly-equivalent Go reimplementation. But it's not exactly the same,
here are the differences:
1. No cluster deployment logic anymore - we expect everyone to use ops/
machine at this point.
2. All certs/keys are Ed25519 and do not expire by default - but
support for short-lived certificates is there, and is actually more
generic and reusable. Currently it's only used for admincreds.
3. Speaking of admincreds: the new admincreds automatically figure out
your username.
4. admincreds also doesn't shell out to kubectl anymore, and doesn't
override your default context. The generated creds can live
peacefully alongside your normal prodaccess creds.
5. gencerts (the new nodestrap without deployment support) now
automatically generates certs for all nodes, based on local Nix
modules in ops/.
6. No secretstore support. This will be changed once we rebuild
secretstore in Go. For now users are expected to manually run
secretstore sync on cluster/secrets.
Change-Id: Ida935f44e04fd933df125905eee10121ac078495
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1498
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/cluster/clustercfg/cmd_gencerts.go b/cluster/clustercfg/cmd_gencerts.go
new file mode 100644
index 0000000..6cb6431
--- /dev/null
+++ b/cluster/clustercfg/cmd_gencerts.go
@@ -0,0 +1,63 @@
+package main
+
+import (
+ "log"
+ "path/filepath"
+ "strings"
+
+ "github.com/spf13/cobra"
+
+ "code.hackerspace.pl/hscloud/cluster/clustercfg/certs"
+ "code.hackerspace.pl/hscloud/go/workspace"
+)
+
+var flagFQDNs []string
+
+var gencertsCmd = &cobra.Command{
+ Use: "gencerts",
+ Short: "(re)generate keys/certs for k0 cluster",
+ Long: `
+If you're adding a new cluster node, run this. It will populate //cluster/secrets
+and //cluster/certificates with new certs/keys.
+
+By default, the nodes to generate certificates for are automatically discovered
+by querying the local Nix machines defined in //ops, looking for anything that
+has hscloud.kube.controller.enabled. That can be slow and/or incorrect. To override
+node names, set --fqdn (either comma-separate them or repeat flags).
+`,
+ Run: func(cmd *cobra.Command, args []string) {
+ ws, err := workspace.Get()
+ if err != nil {
+ log.Fatalf("Could not figure out workspace: %v", err)
+ }
+ path := filepath.Join(ws, "cluster")
+
+ fqdns := flagFQDNs
+ if len(fqdns) == 0 {
+ log.Printf("--fqdn not set, figuring out machines from Nix...")
+ err = workspace.EvalHscloudNix(cmd.Context(), &fqdns, "ops.exports.kubeMachineNames")
+ if err != nil {
+ log.Fatalf("Could not figure out Kubernetes machine FQDNs: %v", err)
+ }
+ }
+
+ for _, fqdn := range fqdns {
+ parts := strings.Split(fqdn, ".")
+ if len(parts) != 3 || parts[1] != "hswaw" || parts[2] != "net" {
+ log.Fatalf("Invalid FQDN %q: must be xxx.hswaw.net.", fqdn)
+ }
+ }
+
+ log.Printf("Machines: --fqdn %s", strings.Join(fqdns, ","))
+ c := certs.Prepare(path, fqdns)
+ if err := c.Ensure(); err != nil {
+ log.Fatalf("Failed: %v", err)
+ }
+ log.Printf("Done.")
+ },
+}
+
+func init() {
+ gencertsCmd.Flags().StringSliceVar(&flagFQDNs, "fqdn", nil, "List of machine FQDNs to generate certs for. If not set, will be automatically figured out from Nix modules in local checkout (slow).")
+ rootCmd.AddCommand(gencertsCmd)
+}