Project Deploy Demo

A demo to show how to deploy project to k8s.

Project Info

Project is simple:

• :8080/: show <h1>Hello World</h1>
• :8080/health_check: show <h1>Health check</h1>

How to use

1.Test Your Application.

Run app local:

go run main.go

Open browser to:

• localhost:8080/
• localhost:8080/health_check

It’s ok to see:

And Health check;

2.Build your onw image

Write Dockerfile

FROM golang:1.17.2-alpine3.14
MAINTAINER [email protected]
RUN mkdir /app
COPY . /app
WORKDIR /app
RUN go build -o main .
CMD ["/app/main"]

You can change FROM <image> arbitrarily.

Build Image:

docker build -t jasonkay/go-hello-app:v0.0.1 .

You can change image-name arbitrarily.

Push Image:

docker push jasonkay/go-hello-app:v0.0.1

Local Check(Optional)

Use docker run -d -p 8080:8080 --rm --name go-hello-app-container jasonkay/go-hello-app:v0.0.1 to test in docker container.

3.Deploy in K8S

Create file deployment.yaml:

deploy/deployment.yaml

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: go-hello-app
  namespace: my-workspace # 声明工作空间，默认为default
spec:
  replicas: 2
  selector:
    matchLabels:
      name: go-hello-app
  template:
    metadata:
      labels:
        name: go-hello-app
    spec:
      containers:
        - name: go-hello-container
          image: jasonkay/go-hello-app:v0.0.1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8080 # containerPort是声明容器内部的port

---
apiVersion: v1
kind: Service
metadata:
  name: go-hello-app-service
  namespace: my-workspace # 声明工作空间，默认为default
spec:
  type: NodePort
  ports:
    - name: http
      port: 18080 # Service暴露在cluster-ip上的端口，通过<cluster-ip>:port访问服务,通过此端口集群内的服务可以相互访问
      targetPort: 8080 # Pod的外部访问端口，port和nodePort的数据通过这个端口进入到Pod内部，Pod里面的containers的端口映射到这个端口，提供服务
      nodePort: 31080 # Node节点的端口，<nodeIP>:nodePort 是提供给集群外部客户访问service的入口
  selector:
    name: go-hello-app

Your may need to change some configs:

• metadata.namespace;
• spec.spec.containers.image;

then deploy to your k8s cluster:

kubectl create -f deploy/deployment.yaml

4.Check Deployment

First, use command to check:

kubectl get po -n my-workspace
 
NAME                            READY   STATUS    RESTARTS   AGE
go-hello-app-555c69b994-zt9zf   2/2     Running   0          54m
go-hello-app-555c69b994-zwdb7   2/2     Running   0          54m

Second, use dashboard to check:

Finally, Visit NodePort to check:

• http://k8s-node-ip:31080/

And you will see just as the same as:

5.Delete Deployment

Use command below to delete Deployment:

kubectl delete -f deploy/deployment.yaml

Linked Blog

使用K8S部署最简单的Go应用