This page shows how to create a Kubernetes Service object that exposees an external IP address.
You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube.
Run a Hello World application in your cluster:
kubectl run hello-world --replicas=5 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
The preceding command creates a Deployment object and an associated ReplicaSet object. The ReplicaSet has five Pods, each of which runs the Hello World application.
Display information about the Deployment:
kubectl get deployments hello-world
kubectl describe deployments hello-world
Display information about your ReplicaSet objects:
kubectl get replicasets
kubectl describe replicasets
Create a Service object that exposes the deployment:
kubectl expose deployment hello-world --type=LoadBalancer --name=my-service
Display information about the Service:
kubectl get services my-service
The output is similar to this:
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-service 10.3.245.137 104.198.205.71 8080/TCP 54s
Note: If the external IP address is shown as <pending>, wait for a minute and enter the same command again.
Display detailed information about the Service:
kubectl describe services my-service
The output is similar to this:
Name: my-service
Namespace: default
Labels: run=load-balancer-example
Selector: run=load-balancer-example
Type: LoadBalancer
IP: 10.3.245.137
LoadBalancer Ingress: 104.198.205.71
Port: <unset> 8080/TCP
NodePort: <unset> 32377/TCP
Endpoints: 10.0.0.6:8080,10.0.1.6:8080,10.0.1.7:8080 + 2 more...
Session Affinity: None
Events:
Make a note of the external IP address exposed by your service. In this example, the external IP address is 104.198.205.71. Also note the value of Port. In this example, the port is 8080.
In the preceding output, you can see that the service has several endpoints: 10.0.0.6:8080,10.0.1.6:8080,10.0.1.7:8080 + 2 more. These are internal addresses of the pods that are running the Hello World application. To verify these are pod addresses, enter this command:
kubectl get pods --output=wide
The output is similar to this:
NAME ... IP NODE
hello-world-2895499144-1jaz9 ... 10.0.1.6 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-2e5uh ... 0.0.1.8 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-9m4h1 ... 10.0.0.6 gke-cluster-1-default-pool-e0b8d269-5v7a
hello-world-2895499144-o4z13 ... 10.0.1.7 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-segjf ... 10.0.2.5 gke-cluster-1-default-pool-e0b8d269-cpuc
Use the external IP address to access the Hello World application:
curl http://<external-ip>:<port>
where <external-ip>
is the external IP address of your Service,
and <port>
is the value of Port
in your Service description.
The response to a successful request is a hello message:
Hello Kubernetes!
To delete the Service, enter this command:
kubectl delete services my-service
To delete the Deployment, the ReplicaSet, and the Pods that are running the Hello World application, enter this command:
kubectl delete deployment hello-world
Learn more about connecting applications with services.
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