Grafana Kubernetes deployment

Deploy the Lightstep Incident Response Grafana plugin in the Kubernetes environment. The steps here are prepared using minikube in a development environment. Some of the steps might vary in an actual production environment.

Note: This is a sample script to help with the configuration. The steps could change depending on your environment and OS.

Create Docker image with Grafana image and LIR plugin

Get the docker file from the Grafana github repository from here. The url is for alpine-linux. For ubuntu use a different dockerfile in the same folder.
Save the contents of the above link into a file (Dockerfile).

Build the docker image by running the following command. Note that there is a dot at the end:

docker build \
  --build-arg "GRAFANA_VERSION=latest" \
  --build-arg "GF_INSTALL_PLUGINS=https://github.com/ServiceNow/lightstep-ir-grafana-metrics/archive/master.zip;lightstep-ir-grafana-metrics" \
  -t lir-grafana-image -f Dockerfile .

Run Grafana on Kubernetes environment

Create a file named lir-grafana-pv.yaml using the following:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: grafana-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  storageClassName: manual
  hostPath:
    path: "/mnt/data"

Create a file named lir-grafana-pv-claim.yaml using the following:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: grafana-pvc
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 100Mi

Create a file name lir-grafana.yaml using the following:

---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: grafana
  name: grafana
spec:
  replicas: 2
  selector:
    matchLabels:
      app: grafana
  template:
    metadata:
      labels:
        app: grafana
    spec:
      securityContext:
        runAsUser: 0
      containers:
        - name: grafana
          image: lir-grafana-image
          imagePullPolicy: Never
          env:
          -  name: GF_PLUGINS_ALLOW_LOADING_UNSIGNED_PLUGINS
             value: lightstep-ir-grafana-metrics
          ports:
            - containerPort: 3000
              name: http-grafana
              protocol: TCP
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /robots.txt
              port: 3000
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 30
            successThreshold: 1
            timeoutSeconds: 2
          livenessProbe:
            failureThreshold: 3
            initialDelaySeconds: 30
            periodSeconds: 10
            successThreshold: 1
            tcpSocket:
              port: 3000
            timeoutSeconds: 1
          volumeMounts:
            - mountPath: /var/lib/grafana
              name: grafana-storage
      volumes:
        - name: grafana-storage
          persistentVolumeClaim:
            claimName: grafana-pvc

---
apiVersion: v1
kind: Service
metadata:
  name: grafana
spec:
  ports:
    - port: 3000
      protocol: TCP
      targetPort: http-grafana
  selector:
    app: grafana
  sessionAffinity: None
  type: LoadBalancer

Run the following commands to create PersistentVolume, PersistentVolumeClaim, Deployment, Services, and Pods:
```
kubectl create -f lir-grafana-pv.yaml
kubectl create -f lir-grafana-pv-claim.yaml
kubectl create -f lir-grafana.yaml
```
Verify by running the following commands to see if the resources mentioned above are created and the status is shown as Bound:
```
kubectl get pv grafana-pv 
kubectl get pvc grafana-pvc
```
Verify by running the following command to see if the status of the Pods are Running:
```
kubectl get pods
```

Reference Links: