5 - Deployments

Question 1

What is a deployment?

Answer 1

Ability to update applications continuously without generating unavailability for users.

Question 2

What is the definition of the deployment configuration file?

Answer 2

apiVersion: apps/v1
kind: Deployment
metadata:
 name: rs-myapp
 labels:
   tier: production
spec:
  template:
    metadata:
      name: nginx
      labels:
        tier: production
    spec:
      containers:
        - name: nginx
          image: nginx
  replicas: 6
  selector:
    matchLabels:
      tier: production

Question 3

What command can I use to check the status of all objects running on Kubernetes?

Answer 3

kubectl get all

Question 4

What command can I use to check the status of only deployments?

Answer 4

kubectl get deployments

Question 5

How can I check the status of a rollout?

Answer 5

kubectl rollout status deployment/deploy_name

Question 6

How can I check the history of a deployment?

Answer 6

kubectl rollout history deployment/deploy_name

Question 7

How many types of deployment strategy are there in kubernetes?

Answer 7

recreate -> First it destroys all pods and then recreates them with the new version. This generates a short period of downtime.

rolling update ->Disabling pods with older versions is done one by one. Deactivate an old one and activate a new one, until all deployment pods are completed.

Question 8

How is a deployment updated?

Answer 8

kubectl apply -f arquivo.yaml

Question 9

How can I make a change to the version of the image used in a deployment without changing the configuration file?

Answer 9

kubectl set image deployment/deploy_name nginx=nginx:1.9.1