Steps to access the POD from outside the clusterIn this blog, we will show you the Steps to access the POD from outside the cluster in Google Kubernetes environment.
- 2 Node Cluster ( 1 Master VM with 2 Nodes)
- Kubernetes Components
- We have already installed and configured the 2 Node cluster in our demo environment.
- Please check the URL https://www.assistanz.com/steps-to-install-kubernetes-cluster-manually-using-centos-7/ for more information.
- We can able to access our application through services. Our application can be access from the inside and the outside the cluster.
- Services will be the reliable between the POD and client end.
- The service will get a virtual IP from the DNS and it will never change. Also, it gets a DNS name and a Port number. The port number is available through cluster-wide. Using this port we can able to access our application from outside.
- We are creating endpoint object along with the services. It contains the POD information. The endpoint will get updated when a POD creates (or) deletes.
- We tied pods with services using Labels.
- We will specify the Labels information in the POD creation manifest file.
- DNS cluster add-on implements DNS service in the cluster.
- Services get DNS names that are resolvable inside the cluster.
- We have already created a POD named hello-pod for this demo.
- Also, we used the below manifest file to create our demo hello-pod.
Note: Labels are mandatory for kubernetes services. So we need to specify the label information in the manifest file for POD creation.
- Currently, there are 2 nodes in the cluster. Node 1 IP is 192.168.3.82 and Node 2 IP is 192.168.3.83
CREATING A SERVICE
- From the Kubernetes Master server, execute the below command to create a service.
Syntax: kubectl expose pod --name= --port= --type=NodePort
Example: kubectl expose pod hello-pod --name=hello-svc --port=80 --type=NodePort
Note: By default, public ngnix container listens to port 80.
- Service created successfully.
- Describe the service using the below command.
kubectl describe service hello-svc
- The service virtual IP is 10.103.224.243 and the NodePort is 30134. Using this node port we can able to access the application from your local machine.
- Services Port will be available from 30000 to 32767.
- Open the web browser from the local machine and access type the kubernetes node IP along with the Node port.
- We are able to access the nginx homepage successfully. It’s a containerized web server listening in the port 80 and we mapped it to 30134 in every node in the cluster.
- We can also able to access the application from Node 2.