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Couchbase Cluster on Kubernetes

The files in this directory can serve as an example of how to deploy a Couchbase Server cluster on Kubernetes. Tested on GKE, Amazon as well as a self-deployed Kubernetes cluster.

It should be noted at the beginning that this setup depends on KubeDNS to be enabled and functional to successfully deploy.

Create “master” node

kubectl create -f cluster-master.yml

This will provision a LoadBalancer for the Web Console of the master node.

Use kubectl describe svc couchbase-master-service to get the IP address of LOAD_BALANCER. Give ~3 mins for laod balancer to be ready. Connect to the Web Console by going to $LOADBALANCER_IP:8091 in your browser.

Attach “worker” node

Attach worker node to the cluster:

kubectl create -f cluster-worker.yml

Rebalance the cluster using the Web Console.

Alternatively, attach the node and rebalance the cluster in one command:

kubectl create -e AUTO_REBALANCE=true -f cluster-worker.yml

Run Application

Run the application

kubectl create -f client-service.yml

This will provision a Load Balancer for the WildFly application server.

Describe service using kubectl describe svc/client-service. Access the endpoint curl http://$LOADBALANCER_IP:8080/couchbase-javaee/resources/airline

This will show the output:

curl http://a5b669ab9907711e68bf502342b4e804-1085842488.us-west-2.elb.amazonaws.com:8080/couchbase-javaee/resources/airline
[{"travel-sample":{"country":"United States","iata":"Q5","callsign":"MILE-AIR","name":"40-Mile Air","icao":"MLA","id":10,"type":"airline"}}, {"travel-sample":{"country":"United States","iata":"TQ","callsign":"TXW","name":"Texas Wings","icao":"TXW","id":10123,"type":"airline"}}, {"travel-sample":{"country":"United States","iata":"A1","callsign":"atifly","name":"Atifly","icao":"A1F","id":10226,"type":"airline"}}, {"travel-sample":{"country":"United Kingdom","iata":null,"callsign":null,"name":"Jc royal.britannica","icao":"JRB","id":10642,"type":"airline"}}, {"travel-sample":{"country":"United States","iata":"ZQ","callsign":"LOCAIR","name":"Locair","icao":"LOC","id":10748,"type":"airline"}}, {"travel-sample":{"country":"United States","iata":"K5","callsign":"SASQUATCH","name":"SeaPort Airlines","icao":"SQH","id":10765,"type":"airline"}}, {"travel-sample":{"country":"United States","iata":"KO","callsign":"ACE AIR","name":"Alaska Central Express","icao":"AER","id":109,"type":"airline"}}, {"travel-sample":{"country":"United Kingdom","iata":"5W","callsign":"FLYSTAR","name":"Astraeus","icao":"AEU","id":112,"type":"airline"}}, {"travel-sample":{"country":"France","iata":"UU","callsign":"REUNION","name":"Air Austral","icao":"REU","id":1191,"type":"airline"}}, {"travel-sample":{"country":"France","iata":"A5","callsign":"AIRLINAIR","name":"Airlinair","icao":"RLA","id":1203,"type":"airline"}}]

Scale Couchbase Cluster

Scale Couchbase cluster using scaling commands for worker RC:

kubectl scale rc couchbase-worker-rebalance-rc --replicas=3

Build your own image

  1. Create the image with docker build -t $DESIRED_IMG_NAME .

  2. Update cluster-master.yml and cluster-worker.yml with your new image name, if necessary.

  3. arungupta/couchbase-javaee is built from https://github.com/arun-gupta/couchbase-javaee. Use the command mvn clean package -Pdocker.