Kubernetes: Deploying NGINX Pods

In this walkthrough I will show you how to deploy a nginx server with a technology called Kubernetes.

WHAT THE HECK IS KUBERNETES?!

“Kubernetes is an open-source container orchestration system for automating software deployment, scaling, and management. Originally designed by Google, the project is now maintained by the Cloud Native Computing Foundation. The name Kubernetes originates from Greek, meaning helmsman or pilot.” -https://en.wikipedia.org/wiki/Kubernetes

The short name for Kubernetes is “K8s”. The 8 stands for the 8 letters between the K and the S.

Let’s get started

Before you begin you will need to have Kubernetes (or a flavor of it) already installed on your system.

Step 1.
Let’s create a pod with nginx as the image with the following command

kubect create deployment <your deployment> --image=nginx

Step 2.
Let’s check that our pod has been deployed

kubectl get deployments

Step 3.
Let’s get some more info about the pod

kubectl describe deployment <your deployment>

Step 4.
Now let’s get the IP and show that our nginx image is running.
To get the IP of your pod you will need to run the follow command

kubectl get pod -o wide

Then to see that the server is running the nginx image lets curl our IP

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Step 5.

Now let’s look at the logs

kubectl logs deployment/<your deployment>

Step 6.
Now let’s delete our deployment

kubectl delete deployment <your deployment>

Step 7.

Now let’s do the same thing but with a YAML file.

Open up a text editor, I am using vim.

vi <your yaml>

Next enter in the code for a nginx server to spin up.

kind: Deployment  
apiVersion: apps/v1  
metadata:  
  name: nginx-deployment  
spec:  
  replicas: 1  
  selector:  
    matchLabels:  
      app: nginx-deployment  
  template:  
    metadata:  
      labels:  
        app: nginx-deployment  
    spec:  
      containers:  
        - name: nginx  
          image: nginx:latest  
          ports:  
          - containerPort: 80

Step 8.

Now deploy it

kubectl apply -f <your yaml>

Now lets look at the pod we just deployed

kubectl get pod

Step 9.
Let’s get some more info on it.

kubectl describe deployment <your deployment>

Notice there is only 1 available

Step 9.

Next lets get the IP address of our pod and curl it

kubectl get pod -o wide

Step 10.

Now let’s change our yaml file to include a Load Balancer and to deploy 4 pods instead of 1.

You will need to edit your yaml file to include the Load Balancer code. Here is that code. Also, let’s change 1 replica to 4 replicas

apiVersion: v1  
kind: service  
metadata:  
  name: nginx-deployment  
spec:  
  type: LoadBalancer  
  ports:  
    - port: 80  
  selector:  
    app: nginx-deployment  
---  
apiVersion: apps/v1  
kind: Deployment  
metadata:  
  name: nginx-deployment  
spec:  
  replicas: 4  
  selector:  
    matchLabels:  
      app: nginx-deployment  
  template:  
    metadata:  
      labels:  
        app: nginx-deployment  
    spec:  
      containers:  
        - name: nginx  
          image: nginx:latest  
          ports:  
          - containerPort: 80

Now let’s deploy it

kubectl apply -f <your yaml>

Let’s look at the result

kubectl get pod

Check it out…4 pods instead of 1

Let’s get some more info

kubectl describe deployment <your deployment>

Step 11.

Next step is to get the IP. Since we have a Load Balancer and it is a service running we need run the following command

kubectl get services

Let’s curl that IP

Voila! You have gone from deploying a pod from the command line to deploying a pod with a yaml file and then to deploying a load balancer and deploying 4 pods.

Thank you for following along, I hope you enjoyed this walkthrough