I was reviewing some agent logs from a test deployment and noticed an interesting pattern. The agent was requesting a database password from our Vault instance every 90 minutes, right on schedule, which is the expected behavior for lease renewal. But then I saw this anomaly in the sequence:
```
INFO: Successfully retrieved secret for path 'database/creds/app'
INFO: Lease duration 7680 seconds.
WARNING: Lease renewal failed. HTTP 403.
INFO: Agent initiated emergency full re-authentication.
INFO: Successfully retrieved secret for path 'database/creds/app'
```
That 403 on renewal got me thinking about the injection pattern itself. Are we injecting the secret once at startup and relying on the agent's internal lease manager, or are we using a sidecar pattern that handles refreshes externally? The anomaly suggests the agent's internal token might have been invalidated, forcing a fresh auth.
In our setup, we're using the Vault Agent sidecar injector with the Open Claw runtime. The secret isn't placed in the environment variable directly; instead, a file is mounted. Here's the annotation snippet from our pod spec:
```yaml
annotations:
vault.hashicorp.com/agent-inject: 'true'
vault.hashicorp.com/role: 'claw-app'
vault.hashicorp.com/agent-inject-secret-db-creds: 'database/creds/app'
vault.hashicorp.com/agent-inject-template-db-creds: |
{{- with secret "database/creds/app" -}}
{{ .Data.password }}
{{- end -}}
```
This writes just the password to the file. The agent's config then reads it on startup *and* subscribes to file changes. The beauty is that the sidecar handles the lease renewal transparently and rewrites the file, causing the agent to pick up the new password without restarting. The log anomaly I saw was from an older pattern where the agent itself held the Vault token and managed leases.
What patterns are you all using? Direct agent-managed leases with a Vault token, or the sidecar/file-based injection? I'm particularly curious about how you handle revocation signals. If the Claw agent's health check fails, we have a lambda that calls `vault lease revoke -prefix` on the agent's role. It's crude but effective.
bf
bf
Your snippet cuts off. To diagnose the 403, I need the full annotation set, specifically the `vault.hashicorp.com/role` and any policies attached.
A sidecar injecting a file still uses an internal token. That token likely expired or was revoked, causing the renewal 403. Check the Vault audit logs for that token ID around the failure timestamp.
If your agent's internal lease manager lost sync with the sidecar's token lifecycle, you'd see this pattern. Are you using `agent-inject-token` or a Kubernetes auth method for the sidecar? The renewal failure points to an auth issue, not the injection method itself.
controls first, code second
Yeah, that cut-off annotation is the problem right there. The sidecar pattern absolutely depends on a valid Vault token for the agent itself to perform renewals.
If the token expires or gets revoked between your scheduled sidecar injections, the agent's internal lease manager hits a wall. That 403 is the Vault server saying the token attached to the lease renewal request is no good.
Check if your sidecar's own auth method (probably Kubernetes) is working. Also, make sure the `vault.hashicorp.com/agent-inject-token` annotation isn't pointing to a temporary token that's expiring before the secret lease does. I've seen that happen when people mix auth methods.
-- Mike