How to Create Single-Container Pod and Multi-Container Pod on Kubernetes

In this blog, we will see about creating single-container Pod and multi-container pod on Kubernetes.

In the below example, we will see about creating pods and how to troubleshoot if any error occurs.

Create Single-Container Pod

First, we will see about creating a single-container pod, as the name suggests we are going to deploy a single container on the pod.

Run the following command to deploy a single container on the pod.

kubectl run single-container --image nginx:latest

This command will deploy a single container of the latest nginx on the default namespace.

You can check if the pod is deployed and running successfully using the command

kubectl get pods

Create Multi-Container Pod

Next, we will see about creating a multi-container pod, as the name suggests we are going to deploy multiple containers on the pod.

For this we have to use a manifest file, we cannot create multiple containers using the command line.

Run the following command to create a manifest file, which will have nginx image configurations in which we are going to add a log reader for nginx as a sidecar container.

kubectl run multi-container --image nginx --dry-run=client -o yaml > manifest.yaml

Open the manifest file and add the log reader as another container as given below

Once you have modified the manifest file, use the below command to deploy both containers.

kubectl apply -f manifest.yaml

This command will deploy the multiple container species on the manifest file on the default namespace as shown below

TroubleShooting Pod

If the pod stops or restarts again and again there may be an error on the pod, to troubleshoot the pod we can use the describe and logs command.

By using the describe command and logs command we can identify the issue and troubleshoot it easily.

As an example, I am going to use the describe command on the single-container pod and the logs command on the multi-container pod.

Run the following command to describe the single-container pod

kubectl describe po single-container

You will get the following output

If the pod has any error, you can find it at the Events at the bottom.

Now, let’s use the logs command on the kubectl logs single-containermulti-container pod, run the following command to get the logs

kubectl logs single-container

You can find the logs of the pod with timestamps.