In this lab we will practice creating deployment with yaml file
In case you prefer a video, check below our YouTube video for this lab
Task: Create Kubernetes cluster with 3 worker nodes.
Master: 1 node
Worker: 2 node
Hint
Solution
Create docker hub account. Docker Hub if you already have one skip this step
Open Play with Kubernetes login with your docker hub account.
Click on start
It will start a 4 hr session
create three instance
click on + ADD NEW INSTANCE three time to add three instances
on first instance enter below command, this node will be master node
kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16
enter below command on first node
kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml
capture output of kubeadm join XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
enter captured command in second and third node
kubeadm join XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Check node status, all 3 nodes should be in ready state
Task: Create a Deployment with below settings
name: demo
image: nginx
replca: 3
labels:
app: demo
type: web
verify with below command
kubectl get deployment
Solution
Enter terminal of master node and create a new file withvi deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: demo
labels:
app: demo
type: web
spec:
replicas: 3
selector:
matchLabels:
type: web
template:
metadata:
labels:
type: web
spec:
containers:
- name: demo-nginx
image: nginx
ports:
- containerPort: 80
kubectl apply -f deployment.yaml
this command will create deployment using seeting in yaml file
Task: How many pods are created by Deployment?
Solution
kubectl get rs
kubectl get pods
Task: Which nodes are pods running on?
Solution
kubectl get pods -o wide
Task: Find details on Deployment created in this lab
Solution
kubectl describe deployment demo
this command will provide details of deployment
Task: Use kubectl command to get Deployment details in yaml format.
Solution
kubectl get deployment demo -o yaml
Task: Use kubectl command to get Deployment details in json format.
Solution
```javascript
kubectl get deployment demo -o json
Task: Scale Deployment to 5 replicas
verify with below command
kubectl get deployment
Solution
```javascript
kubectl scale deployment demo --replicas=5
Task: How many pods are managed by Deployment?
Solution
kubectl get pods
Task: Confirm that pod is managed by Replicaset
Solution
kubectl describe pods demo-XXXX-YYY
kubectl describe rs <name of Replicaset from previous step>
Task: Delete Deployment we created in this lab
Solution
kubectl delete deployment demo
Task: Delete all open nodes/instances and close session
- Select the node and click on DELETE
- Repeat same for any other open nodes
- click close session
