Deploying Camunda to Kubernetes requires the following steps:
1. Package Camunda into a Docker image.
2. Create a Deployment object in Kubernetes to define the number of copies of the Camunda application, container images, environment variables, volume mounts and other information. For example, a Deployment can be created with the following command:
kubectl create deployment camunda-deployment –image=camunda/camunda-bpm-platform:latest
Among them, camunda/camunda-bpm-platform:latest is the official Docker image provided by Camunda.
3. Create a Service object for the Deployment object to expose the Camunda application to the external network. A Service can be created with the following command:
kubectl expose deployment camunda-deployment –type=LoadBalancer –port=8080 –target-port=8080
Among them, –type=LoadBalancer specifies that the Service type is a load balancer, –port=8080 specifies that the Service port is 8080, –target- port=8080 specifies the port of the backend Pod as 8080.
4. Configure the Camunda application.
Camunda configuration information can be passed through environment variables, ConfigMap, Secret, etc. For example, you can use the ConfigMap object to store Camunda configuration files, and then mount the ConfigMap into the Camunda container. The following is a basic ConfigMap definition file:
apiVersion: v1
kind: ConfigMap
metadata:
name: camunda-config
data:
bpm-platform.xml: |-
jdbc:mysql://localhost:3306/camunda root password com.mysql.jdbc.Driver
The above ConfigMap object defines Camunda's data source configuration information, which can be modified according to the actual situation. Then, mount the ConfigMap into the container in the Deployment object, for example:
spec:
containers:
– name: camunda
image: camunda/camunda-bpm-platform:latest
ports:
– containerPort: 8080
volumeMounts:
– name: camunda-config
mountPath: /camunda/config
volumes:
– name: camunda-config
configMap:
name: camunda-config
The above Deployment object defines a container named camunda, and mounts the ConfigMap object to the /camunda/config directory in the container.
5. Start the Camunda application.
Use the kubectl apply command to apply the above configuration to the Kubernetes cluster, for example:
kubectl apply -f deployment.yaml
where deployment.yaml is a YAML file containing the above configuration.
6. Access the Camunda app.
After waiting for the Camunda application to start, use the kubectl get services command to view the IP address and port number of the Service, and access the address of the Camunda application in a web browser.
