如何用docker swarm 实现集群

如何用docker swarm 实现集群，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

(1) go 编写 web 程序

主要实现 监听 ip:9090/Source 浏览，并记录 服务器主机与访问次数。

代码

package mainimport ( "fmt" "log" "net/http" "runtime" "strconv" "os")var i int = 0func sayHello(w http.ResponseWriter, r *http.Request){//func sayHello(){        i++        fmt.Print(i)        fmt.Print("\n")        fmt.Print("visit!"+"\n")        hostname,er :=os.Hostname()        if er == nil {                dates := "jenkins:"+"Login \n"+"visit Count:"+strconv.Itoa(i)+"\nHostname:"+hostname                w.Write([]byte(dates))                defer r.Body.Close()        }else {                return        }}func main(){        fmt.Print("<<<<< "+runtime.GOOS+"\n")        fmt.Print("<<<<< "+runtime.GOARCH+"\n")        http.HandleFunc("/Source",sayHello)        fmt.Print("<<< debug start"+"\n")        er := http.ListenAndServe(":9090",nil)        fmt.Print("<<< debug end")        fmt.Print(er)        if er != nil {                log.Fatal("ListenAndServe",er)        }}

(2) 生成arch 程序

go build arch.go

(3) arch + Dockerfile 生成微服务镜像

Dockerfile

FROM ubuntu:16.04MAINTAINER ZHBCOPY ./arch /RUN chmod 777  /archRUN touch /log.txtEXPOSE 9090ENTRYPOINT ["sh","-c","./arch >> /log.txt"]  #可在 容器里 tail -f log.txt 监控

docker build -t ip:5000/swarm:0.0 ./

ubuntu@local:~/SWARM$ docker build -t 192.168.175.139:5000/swarm:0.0  ./Sending build context to Docker daemon  6.629MB #Sending build context 可以用.dockerignore 阻止 Step 1/7 : FROM ubuntu:16.04 ---> a51debf7e1ebStep 2/7 : MAINTAINER ZHB ---> Using cache ---> 26b542a8286bStep 3/7 : COPY ./arch / ---> Using cache ---> aff0b358480cStep 4/7 : RUN chmod 777  /arch ---> Using cache ---> 6e07a223b571Step 5/7 : RUN touch /log.txt ---> Using cache ---> 03be86c93b8aStep 6/7 : EXPOSE 9090 ---> Using cache ---> fe9c6a7ab542Step 7/7 : ENTRYPOINT ["sh","-c","./arch >> /log.txt"] ---> Using cache ---> 6287178e0005Successfully built 6287178e0005Successfully tagged 192.168.175.139:5000/swarm:0.0

push 镜像

docker push ip:5000/swarm:0.0

（4）主节点 swarm init

docker swarm init

其他服务器加入集群

docker swarm join --token **** ip:2377

（5）创建service

docker service create --replicas 6 --name=swarm-service --publish 9090:9090 IP:5000/swarm:0.0

overall progress: 0 out of 6 tasks1/6: preparing [=================================>                 ]2/6: preparing [=================================>                 ]3/6: preparing [=================================>                 ]4/6: preparing [=================================>                 ]5/6: preparing [=================================>                 ]6/6: preparing [=================================>                 ]

(6) web 访问 ip:9090/Source 并实现负载均衡

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