Name		Name	Last commit message	Last commit date
parent directory ..
README.md		README.md
deployment.yaml		deployment.yaml

README.md

Deployment

Create Deployment
```
kubectl apply -f deployment.yaml
```
Check
```
kubectl get deployment
```
```
kubectl get replicaset
```
```
kubectl get replicaset nginx-xxxx -o yaml
```
- You can see the replicaset is created by Deployment in ownerReferences field.
- You can also see pod-template-hash, which is added by Deployment.
```
kubectl get pod
```
Change replicas
1. Update replicas: 2 in deployment.yaml
2. Apply it
```
kubectl apply deployment.yaml
```
  rollout isn't triggered as replica is not in the pod template.
Change image by command
```
kubectl set image deployment/nginx nginx=nginx:1.15
```
check:
```
kubectl get rs
```
You can see two replicasets; one is old one, the other is new one.
Change image by updating yaml file.
1. Change nginx:1.14 -> nginx:1.15 in deployment.yaml
2. Apply it
```
kubectl apply -f deployment.yaml
```
3. You can check the replicasets
```
kubectl get replicaset
```
  -> 3 replicasets

Rollback

Check rollout history.

kubectl rollout history deployment.v1.apps/nginx

Roll back to the revision 2

kubectl rollout undo deployment.v1.apps/nginx --to-revision=2

Check replicaset
```
kubectl get rs
```
-> replicaset with nginx:1.15 has running pods.

Delete the resources
```
kubectl delete -f deployment.yaml
```