Kubernetes 101 : Deployment, rollout, rollback and scaling of pods

Creting a deployment:

Deployments handle replicasets and replicasets deal with pods:

We create a deployment using the below command:

The command creates the deployment called "deployment_1" and writes the Yaml configuration file to the "deployment_1.yaml" file.

Creating the deployment manually:

We could also write the Yaml configuration file for our deployment manually as below:

Then we create our deployment using the below command:

We can check our deployment using the below command:

We can also see our pods using the below command:

Changing the image version:

We can change the version of the deployed "nginx" image in the Yaml file:

The "version" could be "1.18" or "1.19" for example in the case of an "nginx" image.

Then we can check the status of our deployment using the below command:

To see the history of the versions deployed, we could use the below command:

To cancel the rollout and get back to the previous version, we use:

Scaling our application:

We can scale our three "nginx" pods up to fifty pods using the below command:

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