mg4/k8s

Kubernetes manifests — car.k8s.stinnesbeck.com

Plain manifests for the car server, InfluxDB 2 and Grafana. They are only files: nothing here is applied automatically. Apply them yourself.

File	What
namespace.yaml	Namespace mg4
influxdb.yaml	InfluxDB 2.7.12 StatefulSet (10Gi PVC, default storage class), cluster-internal Service, NetworkPolicy admitting only the server and Grafana
server.yaml	Go server Deployment (1 replica, non-root, read-only root filesystem) and Service
grafana.yaml	Grafana 13.2.3 Deployment (1Gi PVC), Service; datasource and dashboards provisioned
grafana/	The provisioned InfluxDB datasource and the MG4 dashboards (Live, Consumption, Charging)
ingress.yaml	Traefik IngressRoutes for car.k8s.stinnesbeck.com and Grafana, TLS from Traefik's default certificate
secrets/secrets.example.yaml	Template for the Secrets; placeholders only, not in kustomization.yaml
secrets/secrets.yaml	Your filled-in copy — gitignored, never committed
kustomization.yaml	Everything except the Secrets; generates the Grafana ConfigMaps

Before the first apply

1. Check ingress.yaml: Grafana's host (placeholder car-grafana.k8s.stinnesbeck.com). Both routes use the traefik-internal class, and both hosts must be covered by Traefik's default certificate.
2. Create the Secrets. cp k8s/secrets/secrets.example.yaml k8s/secrets/secrets.yaml (gitignored), replace every CHANGE-ME there (openssl rand -hex 32): influxdb-auth, mg4-server (ingest token, approval password for pairing), grafana-admin and grafana-influx (see below). Keep the template itself on placeholders only.
3. Registry access. The mg4-server package on git.stinnesbeck.com is public, so no pull secret is needed. If you make it private, add an imagePullSecrets entry to server.yaml.

Apply

kubectl apply -f k8s/namespace.yaml
kubectl apply -f k8s/secrets/secrets.yaml
kubectl apply -k k8s/

Use -k, not -f k8s/: plain -f applies the files without kustomize, so the Grafana ConfigMaps (datasource and dashboards) are never created and Grafana does not start.

Grafana's InfluxDB token

Grafana reads InfluxDB with a token that can only read the mg4 bucket, from the grafana-influx Secret. InfluxDB has to create that token, so it is a step of its own:

1. With InfluxDB running, create the token. The influx CLI in the pod is already signed in as admin:

   kubectl -n mg4 exec influxdb-0 -- sh -c \
     'influx auth create --org mg4 --description grafana-read-only --json \
        --read-bucket "$(influx bucket find --name mg4 --hide-headers | cut -f1)"'
   

2. Copy the "token" value from the output into grafana-influx → token in k8s/secrets/secrets.yaml, apply that file, and restart Grafana: kubectl -n mg4 rollout restart deployment/grafana.

Until the Secret exists, Grafana does not start (the container waits for the missing Secret). On a fresh install, apply everything once without Grafana working, create the token, then apply the Secret.

Notes

• InfluxDB's setup mode runs only on an empty volume. Changing admin-token in the Secret later does not change the token inside InfluxDB.
• The server uses the InfluxDB admin token; a token scoped to read/write on the mg4 bucket can replace it later. Grafana has its own read-only token (below).
• The dashboards are read-only in Grafana's UI. Change the JSON in grafana/dashboards/; the ConfigMap name changes with its content, which rolls Grafana.
• The server image is pinned by digest in server.yaml. To upgrade, push a new tag and put its digest there (skopeo inspect docker://git.stinnesbeck.com/nils/mg4-server:<tag>).