Deploy Agents on Persistent Volumes

An example illustrating how to deploy an Agent on a Kubernetes persistent volume (PV).

In this example, you deploy an Agent on a PV, so that each time an application container is started, its mapping to the PV allows to start the Agent directly without the need to download it.

Create a PV specification file pv-volume.yml:

pv-volume.yml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: task-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/tmp/data"

Run this command to create a PV in the specified path:
```
kubectl apply -f ./pv-volume.yml
```

Create a PV claim specification file pv-claim.yml:

pv-claim.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: task-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3G

Run this command to claim the PV:
```
kubectl apply -f ./pv-claim.yml
```

Deploy the Node.js Agent to the PV:

# Download the Agent package
curl -k -o /tmp/seeker-agent.zip "${SEEKER_SERVER_URL}/rest/api/latest/installers/agents/binaries/NODEJS"
# Unzip the Agent package
unzip -d /tmp/seeker /tmp/seeker-agent.zip
# Install the Agent for fetching its dependencies
npm install /tmp/seeker/seeker-agent.tgz --prefix seeker --save
# Copy the Agent installation to PV
cp -r ./seeker /tmp/data

Note: Since you are running these commands on your host, be sure to replace ${SEEKER_SERVER_URL} with its actual URL.

Modify your application image to use the PV by changing run.sh as follows:

run.sh
#!/bin/sh
  
# Deploy the Seeker Agent
if [ -n "${SEEKER_SERVER_URL}" ];
then
    # Start the application with the Agent
    node -r '/data/seeker/node_modules/@synopsys-sig/seeker' index.js
else
    node index.js
fi

Build and publish the application:

docker build -t node-sample .
docker publish node-sample

Create a deployment Pod for the application:

pv-pod.yml
apiVersion: v1
kind: Pod
metadata:
  name: task-pv-pod
spec:
  volumes:
    - name: task-pv-storage
      persistentVolumeClaim:
        claimName: task-pv-claim
  containers:
    - name: task-pv-container
      image: node-sample
      ports:
        - containerPort: 3000
          name: "node-sample"
      env:
        - name: SEEKER_SERVER_URL
          value: "https://seeker-server:8443"
        - name: SEEKER_PROJECT_KEY
          value: "nodejs-sample"
      volumeMounts:
        - mountPath: "/data"
          name: task-pv-storage

Launch the application:
```
kubectl apply -f ./pv-pod.yml
```