使用docker stack方式部署web集群

如何部署swarm集群，请参考：

https://blog.csdn.net/IndexMan/article/details/102713777

创建文件夹

mkdir -p /opt/dockerfile/godockerswarm/ 

cd /opt/dockerfile/godockerswarm/

编写main.go

package main

import (

    "fmt"

    "log"

    "net/http"

    "os"

)

func main() {

    http.HandleFunc("/hi", func(w http.ResponseWriter, r *http.Request) {

        hostName, _ := os.Hostname()

        fmt.Fprintf(w, "HostName: %s", hostName)

    })

    log.Fatal(http.ListenAndServe(":8000", nil))

}

下拉golang镜像

官方的太慢，我直接找了个阿里公共镜像

docker pull registry.cn-hangzhou.aliyuncs.com/artifact/golang:1.12-alpine

docker tag registry.cn-hangzhou.aliyuncs.com/artifact/golang:1.12-alpine golang:1.12-alpine

编写dockerfile

FROM golang:1.12-alpine

# Copy the current directory contents into the container

COPY . /go/src/github.com/lpxxn/godockerswarm/

WORKDIR /go/src/github.com/lpxxn/godockerswarm/

RUN go build

EXPOSE 8000

CMD ["./godockerswarm"]

构建镜像

docker build . -t goweb:1.0

测试运行

docker run -p 8100:8000 1b54d

curl 127.0.0.1:8100/hi; echo

将镜像推送到私有仓库

我这里推送到自己的阿里镜像仓库。

docker tag goweb:1.0 registry.cn-hangzhou.aliyuncs.com/laoxu/goweb:1.0

docker push registry.cn-hangzhou.aliyuncs.com/laoxu/goweb:1.0

编写docker-compose.yml

version: "3"

services:

  web:

    image: registry.cn-hangzhou.aliyuncs.com/laoxu/goweb:1.0

    deploy:

      replicas: 5

      resources:

        limits:

          cpus: "0.1"

          memory: 50M

      restart_policy:

        condition: on-failure

    ports:

      - "8111:8000"

    networks:

      - gowebnet

networks:

  gowebnet:

启动测试

docker stack deploy -c docker-compose.yml mygoweb