This content originally appeared on DEV Community and was authored by Labby
Introduction
In this lab, you will learn how to use the Kubernetes port-forward command to forward a local port to a port on a pod. You will start with simple examples and gradually progress to more complex scenarios.
Forwarding a Local Port to a Pod
In this step, you will learn how to forward a local port to a port on a pod.
- Start by creating a deployment with one replica and an Nginx container:
kubectl create deployment nginx --image=nginx --replicas=1
- Wait for the pod to become ready:
kubectl wait --for=condition=Ready pod -l app=nginx
- Use the
kubectl port-forwardcommand to forward a local port to the pod:
kubectl port-forward < pod_name > 19000:80
Replace <pod_name> with the name of the pod created in step 1, and you can get the <pod_name> with the kubectl get pod -l app=nginx command.
- Open a web browser and go to
http://localhost:19000to view the Nginx welcome page.
Forwarding Multiple Local Ports to a Pod
In this step, you will learn how to forward multiple local ports to a pod.
- Use the
kubectl port-forwardcommand to forward multiple local ports to the pod:
kubectl port-forward 19443:443 < pod_name > 19080:80
Replace <pod_name> with the name of the pod created in step 1, and you can get the <pod_name> with the kubectl get pod -l app=nginx command.
- Open another terminal and use the ss command at the Linux command line to see if ports 19080 and 19443 are on the host.
Forwarding a Local Port to a Pod with Multiple Containers
In this step, you will learn how to forward a local port to a specific container in a pod with multiple containers.
- Create a pod with two containers: Nginx and BusyBox:
cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
name: nginx-busybox
spec:
containers:
- name: nginx
image: nginx
- name: busybox
image: busybox
command:
- sleep
- "3600"
EOF
- Wait for the pod to become ready:
kubectl wait --for=condition=Ready pod nginx
- Use the
kubectl port-forwardcommand to forward a local port to the Nginx container:
kubectl port-forward nginx-busybox 19001:80
- Open a web browser and go to
http://localhost:19001to view the Nginx welcome page.
Using Port-Forward with Kubernetes Services
In this step, you will learn how to use the kubectl port-forward command with Kubernetes services.
- Create a service for the Nginx deployment:
kubectl expose deployment nginx --port=80 --type=ClusterIP
- Use the
kubectl port-forwardcommand to forward a local port to the service:
kubectl port-forward service/nginx 20000:80
- Open a web browser and go to
http://localhost:20000to view the Nginx welcome page.
Summary
Congratulations, you have successfully completed the Kubernetes port-forward command lab! In this lab, you learned how to forward a local port to a pod, forward multiple local ports to a pod, forward a pod port to a local port, forward a local port to a specific container in a pod with multiple containers, and use the kubectl port-forward command with Kubernetes services. These skills are essential for debugging issues in a Kubernetes cluster.
Want to learn more?
- 🚀 Practice Kubernetes Port Forward Command
- 🌳 Learn the latest Kubernetes Skill Trees
- 📖 Read More Kubernetes Tutorials
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This content originally appeared on DEV Community and was authored by Labby
Labby | Sciencx (2024-07-01T03:24:37+00:00) Kubernetes Port Forward Command: A Comprehensive Guide. Retrieved from https://www.scien.cx/2024/07/01/kubernetes-port-forward-command-a-comprehensive-guide/
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