Deployments

A Deployment provides declarative updates for Pods and ReplicaSets.

You describe your desired state in a Deployment, and the Deployment Controller's job is to make the current state match the desired state. You declare your hopes and dreams, and it's Kubernetes' job to make them come true.

Why Deleting a Pod Doesn't Feel Like a Deletion

Remember when we had you delete a pod, only to see that a new pod was created in its place? It's kinda like chopping heads off of a hydra.

That's because the desired state described in our Deployment says we want 2 pods running at all times. When we delete one, the Deployment Controller sees that the current state doesn't match the desired state, so it creates a new pod to make them match again.

Assignment

Take a look at the YAML file for your current deployment in the CLI:

kubectl get deployment synergychat-web -o yaml

Edit the deployment and change the number of replicas from 2 to 10:

kubectl edit deployment synergychat-web

Make sure you've got 10 pods running:

kubectl get pod

Keep using kubectl get pod to check on your pods until all 10 are in a "ready" state. Once they are, run:

kubectl proxy

Run and submit the CLI tests.

The Boot.dev CLI requires you to be signed in to submit your solution!

Copy/paste one of the following commands into your terminal:

Run

bootdev run 9aa64616-7dbc-4bdc-bd69-47f19e9edf98

Submit

bootdev run 9aa64616-7dbc-4bdc-bd69-47f19e9edf98 -s

Default Base URL: http://127.0.0.1:8001
Optionally configure your CLI to override the default base URL by running bootdev config base_url <url>

Run the CLI commands to test your solution.

GET /apis/apps/v1/namespaces/default/deployments/synergychat-web
- 1.
  Expecting status code: 200
- 2.
  Expecting JSON at
```
.kind
```
  to be equal to
```
Deployment
```
- 3.
  Expecting JSON at
```
.status.readyReplicas
```
  to be equal to
```
10
```

Using the Bootdev CLI

The Bootdev CLI is the only way to submit your solution for this type of lesson. We need to be able to run commands in your environment to verify your solution.

You can install it here. It's a Go program hosted on GitHub, so you'll need Go installed as well. Instructions are on the GitHub page.