nilsandClaude Opus 5.5
9226616261
The read-only token for Grafana needed a manual influx command and a
Secret. InfluxDB generates every token but the admin one and ignores a
chosen value (tested on 2.7.12), so it cannot be preset in a Secret.
Instead an init container in the Grafana pod creates it at every start
with the admin token, deletes the one from the previous start, and
writes only the read-only token to a memory-backed volume; the
provisioned datasource reads it with $__file{/run/influx/token}. The
Grafana process never sees the admin token. The grafana-influx Secret
is gone from the template and the README.
Tested in podman: InfluxDB 2.7.12, the script run twice as the Grafana
user (the old token is replaced, not piled up), and Grafana 13.2.3
reporting the datasource healthy with the file-based token.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki
67 lines
3.7 KiB
Markdown
67 lines
3.7 KiB
Markdown
# Kubernetes manifests — car.k8s.stinnesbeck.com
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Plain manifests for the car server, InfluxDB 2 and Grafana. They are only files: nothing here
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is applied automatically. Apply them yourself.
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| File | What |
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| `namespace.yaml` | Namespace `mg4` |
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| `influxdb.yaml` | InfluxDB 2.7.12 StatefulSet (10Gi PVC, default storage class), cluster-internal Service, NetworkPolicy admitting only the server and Grafana |
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| `server.yaml` | Go server Deployment (1 replica, non-root, read-only root filesystem) and Service |
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| `grafana.yaml` | Grafana 13.2.3 Deployment (1Gi PVC), Service; datasource and dashboards provisioned |
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| `grafana/` | The provisioned InfluxDB datasource and the MG4 dashboards (Live, Consumption, Charging) |
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| `ingress.yaml` | Traefik `IngressRoute`s for car.k8s.stinnesbeck.com and Grafana, TLS from Traefik's default certificate |
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| `secrets/secrets.example.yaml` | **Template** for the Secrets; placeholders only, not in `kustomization.yaml` |
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| `secrets/secrets.yaml` | Your filled-in copy — **gitignored**, never committed |
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| `kustomization.yaml` | Everything except the Secrets; generates the Grafana ConfigMaps |
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## Before the first apply
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1. **Check `ingress.yaml`:** Grafana's host (placeholder `car-grafana.k8s.stinnesbeck.com`).
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Both routes use the `traefik-internal` class, and both hosts must be
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covered by Traefik's default certificate.
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2. **Create the Secrets.** `cp k8s/secrets/secrets.example.yaml k8s/secrets/secrets.yaml` (gitignored), replace
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every `CHANGE-ME` there (`openssl rand -hex 32`): `influxdb-auth`, `mg4-server` (ingest token,
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approval password for pairing, the forge token for app updates) and `grafana-admin`.
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Keep the template itself on placeholders only.
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3. **Registry access.** The `mg4-server` package on git.stinnesbeck.com is public, so no pull
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secret is needed. If you make it private, add an `imagePullSecrets` entry to `server.yaml`.
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## Apply
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```sh
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kubectl apply -f k8s/namespace.yaml
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kubectl apply -f k8s/secrets/secrets.yaml
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kubectl apply -k k8s/
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```
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Use **`-k`**, not `-f k8s/`: plain `-f` applies the files without kustomize, so the Grafana
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ConfigMaps (datasource and dashboards) are never created and Grafana does not start.
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## Grafana's InfluxDB token
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Grafana reads InfluxDB with a token that can only read the `mg4` bucket. Nothing to do: an init
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container in the Grafana pod creates it at every start with the admin token, deletes the one
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from the previous start, and hands Grafana only the read-only token (in a memory-backed volume).
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The Grafana process itself never sees the admin token. InfluxDB generates every token but the
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admin one itself, which is why this cannot be a value in the Secret.
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## App updates
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The server relays the app's releases from the private repository to the car's updater
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(`OTA.md`). It reads them with `FORGE_TOKEN` from the `mg4-server` Secret: create a token in
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the forge that can only **read** the `nils/mg4` repository, put it there, apply the Secret and
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restart the server. Without it, updates are off (the car's updater gets a 404). `FORGE_URL`
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and `FORGE_REPO` are set in `server.yaml`.
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## Notes
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- InfluxDB's setup mode runs only on an empty volume. Changing `admin-token` in the Secret later
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does not change the token inside InfluxDB.
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- The server uses the InfluxDB admin token; a token scoped to read/write on the `mg4` bucket can
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replace it later. Grafana has its own read-only token (above).
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- The dashboards are read-only in Grafana's UI. Change the JSON in `grafana/dashboards/`; the
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ConfigMap name changes with its content, which rolls Grafana.
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- The server image is pinned by digest in `server.yaml`. To upgrade, push a new tag and put its
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digest there (`skopeo inspect docker://git.stinnesbeck.com/nils/mg4-server:<tag>`).
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