不同代码发布到k8s集群的细节和注意事项

1. 具体流程

  1. 写代码
  2. dockerfile构建镜像
  3. 把镜像传到harbor镜像仓库
  4. 编写k8s yaml文件，创建资源

2. go代码发布到k8s具体流程

2.1 编写代码

1
2
3
4
5
6
7
8
9
10
11
12
13
package main

import "github.com/gin-gonic/gin"

func main() {
	r := gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"message": "hello,this is a test",
		})
	})
	r.Run(":8888")
}

2.2 编译代码

1
2
3
4
5

go mod init test
go env -w GOPROXY=https://goproxy.cn,direct
go get github.com/gin-gonic/gin
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o k8s-demo main.go

2.3 编写dockerfile文件

1
2
3
4
5
FROM alpine:latest
ADD k8s-demo /data/app/
WORKDIR /data/app/
CMD ["/bin/sh","-c","./k8s-demo"]
EXPOSE 8888
1
docker build -t repo.792588.xyz:8443/k8s-demo:v1 .

2.4 打包镜像上传k8s集群中

1
docker save -o k8s-demo.tar repo.792588.xyz:8443/k8s-demo:v1

在k8s工作节点中倒入镜像

1
ctr -n k8s.io image import k8s-demo.tar

2.5 编写yaml文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
apiVersion: apps/v1
kind: Deployment
metadata:
  name: k8s-demo
  labels:
    app: k8s-demo
spec:
  selector:
    matchLabels:
      app: k8s-demo
  replicas: 2
  template:
    metadata:
      labels:
        app: k8s-demo
    spec:
      containers:
        - name: go
          image: repo.792588.xyz:8443/k8s-demo:v1
          imagePullPolicy: Never

2.6 编写svc文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
apiVersion: v1
kind: Service
metadata:
  name: go-service
spec:
  selector:
    app: k8s-demo
  type: NodePort
  ports:
    - name: http
      port: 8888
      targetPort: 8888
      protocol: "TCP"
    - name: https
      port: 443
      targetPort: 443
      protocol: "TCP"

3. java代码发布到k8s的具体流程

3.1 拉取代码

1
2
3
4
yum install maven* -y
yum install git -y
git clone https://github.com/luckylucky421/SpringBootDemo.git
cd SpringBootDemo/

3.2 编译代码

1
mvn clean package

3.3 打包镜像

1
2
3
4
5
6
7
8
9
##Dockerfile
FROM repo.792588.xyz:8443/library/ibmjava:sfj

MAINTAINER zy

ADD target/www-0.0.1-SNAPSHOT.jar /app/www.jar
CMD ["java", "-Xmx200m", "-jar", "/app/www.jar"]

EXPOSE 8088
1
docker build -t repo.792588.xyz:8443/library/java:v1 .

3.4 镜像上传到dockerhub上

1
2
docker login repo.792588.xyz:8443
docker push repo.792588.xyz:8443/library/java:v1

3.5 编写deploy的yaml文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
apiVersion: apps/v1
kind: Deployment
metadata:
  name: java-web-deploy
  labels:
    app: java-web-deploy
spec:
  replicas: 2
  selector:
    matchLabels:
      app: java-web-deploy
  template:
    metadata:
      name: java-web-deploy
      labels:
        app: java-web-deploy
    spec:
      containers:
        - name: java-web-deploy
          image: repo.792588.xyz:8443/library/java:v1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8088

3.6 编写svc的yaml文件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
apiVersion: v1
kind: Service
metadata:
  name: java-web-svc
  labels:
    app: java-web-deploy
spec:
  type: NodePort
  selector:
    app: java-web-deploy
  ports:
    - name: http
      port: 8088
      targetPort: 8088

4. 开源服务部署到k8s中的注意事项

4.1 部署nginx服务

在k8s中，Deployment控制器可以用来管理和部署应用程序。以nginx为例，以下是k8s中基于Deployment控制器部署nginx服务的一般步骤

  1. 创建nginx镜像：首先，你需要创建一个nginx镜像，其中包含nginx的安装和配置
  2. 定义deployment，在k8s中，使用yaml文件来定义deployment，该文件包含了你想要运行的信息，以及如何运行容器的详细信息，例如nginx服务
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

4.2 k8s部署tomcat服务

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
  labels:
    app: tomcat-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app:  tomcat-deployment
  template:
    metadata:
      name:  tomcat-deployment
      labels:
        app:  tomcat-deployment
    spec:
      containers:
        - name:  tomcat-deployment
          image: tomcat:9.0.34
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8080