Kubernetes

Neil Haddley • February 6, 2021

Kubernetes is a platform for managing containerized workloads.

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Docker Desktop includes Kubernetes.

Enter these commands to deploy the haddley/blog container image:

$ kubectl create deployment blog --image=haddley/blog --replicas=2

$ kubectl expose deployment blog --type=LoadBalancer --port=8080 --target-port=80

Or create a file called blog.yaml and enter this command:

$ kubectl apply -f .\blog.yaml

Adjust the Kubernetes cluster by editing the yaml file below and "applying" the yaml file again.

Access one of the blog web servers by navigating to:

http://<ip address of the computer running Docker Desktop>:8080

Using the "kubectl create deployment" and "kubectl expose deployment" commands

Using the "kubectl create deployment" and "kubectl expose deployment" commands

Using the "kubectl apply" command to apply a yaml file

Using the "kubectl apply" command to apply a yaml file

The Docker image running in two Kubernetes pods.

The Docker image running in two Kubernetes pods.

Accessing the cluster using port 8080

Accessing the cluster using port 8080

blog.yaml

YAML
1apiVersion: apps/v1
2kind: Deployment
3metadata:
4  name: blog-deployment
5  labels:
6    app: blog
7spec:
8  replicas: 2
9  selector:
10    matchLabels:
11      app: blog
12  template:
13    metadata:
14      labels:
15        app: blog
16    spec:
17      containers:
18      - name: blog
19        image: haddley/blog
20        resources:
21          limits:
22            memory: 512Mi
23            cpu: "1"
24          requests:
25            memory: 256Mi
26            cpu: "0.2"
27        ports:
28        - containerPort: 80
29---
30apiVersion: v1
31kind: Service
32metadata:
33  name: blog-service
34spec:
35  selector:
36    app: blog
37  ports:
38    - protocol: TCP
39      port: 8080
40      targetPort: 80
41  type: LoadBalancer

References

Kubernetes Tutorial