rotate-credential

name	rotate-credential
description	Credential rotation for Anton — rotate age key plus SOPS key rotation across the repo, generate a new deploy key for Flux, rotate the 1password token for ESO, or rotate the cloudflare token for the tunnel. Preconditions, verification, rollback.
allowed-tools	Read, Bash

Rotate a credential

Task skill for the four credentials that gate Anton. Each ritual is preconditions → command sequence → verification → rollback. Run only one rotation at a time. Never rotate age.key and a downstream secret in the same change — recover from the age rotation first.

Sources of truth:

• Age public recipient (committed): .sops.yaml, currently age1de4xdcq6h5yk4jjyyqe6qws344xsk055rdzvpr79mehvv7q7rdfqnyetjc
• Age private key: age.key at the repo root (gitignored). Backup is in 1Password vault anton-homelab oct 26 2025.
• 1Password vault: anton — every cluster credential lives here.
• SOPS rules: talos/*.sops.* encrypts the whole file; bootstrap|kubernetes/*.sops.* encrypts only data and stringData fields.

Ritual 1 — rotate age.key (master SOPS key)

Highest stakes. A wrong rotation makes every SOPS file in the repo unreadable to Flux and stops reconciliation cluster-wide.

Preconditions: (1) backup current age.key to 1Password vault anton (new entry, dated today — do not overwrite the anton-homelab oct 26 2025 backup); (2) flux check && flux get ks -A --status=all | rg -v True — empty; (3) SOPS_AGE_KEY_FILE=./age.key sops --decrypt kubernetes/components/sops/cluster-secrets.sops.yaml >/dev/null && echo OK.

Sequence (dual-recipient transition):

# 1. New key (do NOT overwrite age.key yet)
age-keygen -o age.key.new

# 2. Add new recipient to BOTH creation_rules in .sops.yaml (comma-separated, alongside the old)
$EDITOR .sops.yaml

# 3. Re-encrypt every SOPS file to both recipients
SOPS_AGE_KEY_FILE=./age.key fd '\.sops\.ya?ml$' bootstrap/ kubernetes/ talos/ -x sops updatekeys --yes {}
SOPS_AGE_KEY_FILE=./age.key fd '\.sops\.ya?ml$' bootstrap/ kubernetes/ talos/ -x sops filestatus {}

# 4. Promote the new key, re-verify under it
mv age.key age.key.old && mv age.key.new age.key
SOPS_AGE_KEY_FILE=./age.key fd '\.sops\.ya?ml$' bootstrap/ kubernetes/ talos/ -x sops filestatus {}

# 5. Remove the OLD recipient from .sops.yaml and re-run updatekeys
$EDITOR .sops.yaml
SOPS_AGE_KEY_FILE=./age.key fd '\.sops\.ya?ml$' bootstrap/ kubernetes/ talos/ -x sops updatekeys --yes {}

# 6. Push the new key into Flux
kubectl -n flux-system create secret generic sops-age \
  --from-file=age.agekey=./age.key --dry-run=client -o yaml | kubectl apply -f -
flux reconcile source git flux-system

Verification: flux get ks -A --status=all all Ready=True; pick one app using ${VAR} and confirm the substituted value is correct.

Rollback: restore age.key.old → age.key, git restore .sops.yaml, re-apply the old sops-age secret to flux-system. Old key must still be in 1Password.

Ritual 2 — rotate the GitHub deploy key (Flux GitRepository SSH)

Private half: github-deploy.key at repo root (gitignored). Public half: GitHub repo → Settings → Deploy keys.

Preconditions: confirm you can push to the repo with your normal creds (independent of the deploy key); note the current GitHub deploy-key fingerprint so you can identify it later.

Sequence:

ssh-keygen -t ed25519 -C "flux-anton-$(date +%Y%m%d)" -f github-deploy.key.new -N ""
gh repo deploy-key add github-deploy.key.new.pub --title "flux-$(date +%Y%m%d)"

kubectl -n flux-system create secret generic flux-system \
  --from-file=identity=github-deploy.key.new \
  --from-file=identity.pub=github-deploy.key.new.pub \
  --from-file=known_hosts=<(ssh-keyscan github.com 2>/dev/null) \
  --dry-run=client -o yaml | kubectl apply -f -

flux reconcile source git flux-system
flux get sources git -A    # READY=True with a recent revision

Verification: flux get sources git flux-system shows READY=True with a fetch in the last minute; push a trivial commit and confirm Flux picks it up. Then delete the OLD deploy key in GitHub.

Rollback: re-apply the old flux-system secret with the previous private half; the old GitHub deploy key must still exist.

Ritual 3 — rotate the 1Password service-account token (ESO)

Consumed by external-secrets-operator via ClusterSecretStore onepassword-connect. Secret: kubernetes/apps/external-secrets/onepassword-store/app/secret.sops.yaml, key stringData.token. Without it, every ExternalSecret in the cluster stops syncing.

Preconditions: generate a new service-account token in 1Password admin scoped to vault anton only; baseline kubectl get externalsecrets -A | rg SecretSynced | wc -l (expect this count to stay constant after rotation).

Sequence:

SOPS_AGE_KEY_FILE=./age.key sops \
  kubernetes/apps/external-secrets/onepassword-store/app/secret.sops.yaml
# Replace stringData.token, save, exit.
SOPS_AGE_KEY_FILE=./age.key sops filestatus \
  kubernetes/apps/external-secrets/onepassword-store/app/secret.sops.yaml   # encrypted
git add kubernetes/apps/external-secrets/onepassword-store/app/secret.sops.yaml
git commit -m "chore(eso): rotate 1password service-account token"
git push
flux reconcile kustomization onepassword-store -n flux-system --with-source

Verification: kubectl get externalsecrets -A | rg -v SecretSynced empty; ESO logs show no unauthorized: kubectl logs -n external-secrets -l app.kubernetes.io/name=external-secrets --tail=50.

Rollback: revoke the new token in 1Password, git revert HEAD, push, reconcile. Old token must still be valid until rollback succeeds.

Ritual 4 — rotate the Cloudflare tunnel token

Authenticates cloudflare-tunnel's outbound HTTP2/QUIC connection to Cloudflare edge. Secret: kubernetes/apps/network/cloudflare-tunnel/app/secret.sops.yaml, key stringData.TUNNEL_TOKEN. Without it, every public URL stops resolving.

Preconditions: generate a new tunnel token in Cloudflare → Zero Trust → Networks → Tunnels → Anton → Configure → Token (rotate in place — do NOT delete the tunnel); baseline kubectl logs -n network -l app.kubernetes.io/name=cloudflare-tunnel --tail=20 showing Connection registered.

Sequence:

SOPS_AGE_KEY_FILE=./age.key sops kubernetes/apps/network/cloudflare-tunnel/app/secret.sops.yaml
# Replace stringData.TUNNEL_TOKEN, save, exit.
SOPS_AGE_KEY_FILE=./age.key sops filestatus kubernetes/apps/network/cloudflare-tunnel/app/secret.sops.yaml
git add kubernetes/apps/network/cloudflare-tunnel/app/secret.sops.yaml
git commit -m "chore(network): rotate cloudflare tunnel token"
git push
flux reconcile kustomization cloudflare-tunnel -n flux-system --with-source
kubectl -n network rollout restart deploy/cloudflare-tunnel
kubectl -n network rollout status deploy/cloudflare-tunnel

Verification: fresh Connection registered in tunnel logs, no unauthorized. End-to-end: curl -I https://<some-app>.${SECRET_DOMAIN} returns expected response.

Rollback: git revert HEAD, push, reconcile, restart. Previous token stays valid in Cloudflare unless explicitly revoked.

Hard rules

• One rotation at a time. Finish verification before starting the next.
• Never rotate age.key and a downstream secret in the same change.
• Never delete the old credential at the source until verification has passed end-to-end.
• Take a fresh 1Password backup of age.key before AND after every rotation.
• Never log secret values to scripts, files, or shell history. sops edits in-place via $EDITOR; do not pipe secrets through echo or cat.

Related skills

• Triaging Flux when reconciliation breaks after a rotation → debug-flux-reconciliation
• The SOPS vs ExternalSecret decision tree (which credentials live where) → anton-repo-conventions