docker compose 多节点浮动IP测试

概览：

• 先决步骤
• 编译打包：
• 部署服务集群
• 测试

先决步骤

• 代码传送门：

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Makefile

all: build

.PHONY: build
build:
	@go build -tags netgo -installsuffix 'static' -ldflags "-s -w" -o server main.go

.PHONY: deploy
deploy:
	@docker stack deploy -c docker-compose.yml Node

.PHONY: docker
docker:
	@docker build -f "Dockerfile/service" -t helloserver:latest .

.PHONY: clean
clean:
	@rm -f server

服务器端代码
‘main.go’

package main

import (
	"fmt"
	"log"
	"net/http"
	"net/url"
	"os"
	"time"
)

var (
	HOSTNAME string = "UNKNOW"
)

func init() {
	name, err := os.Hostname()
	if err != nil {
		name = err.Error()
	}
	HOSTNAME = name
}

func main() {
	mux := http.NewServeMux()
	mux.Handle("/", http.StripPrefix("/", handler{}))

	server := &http.Server{
		Addr:    "0.0.0.0:8080",
		Handler: mux,
	}
	log.Printf("server Running at http://%v\n", server.Addr)

	server.ListenAndServe()
}

type handler struct{}

func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	start := time.Now()

	w.Write([]byte(HOSTNAME + ":\t" + time.Now().Format("2006-01-02 15:04:05")))

	requestsURL, _ := url.QueryUnescape(r.RequestURI)
	fmt.Printf("%v ---> %v %v %s ", r.RemoteAddr, r.Proto, r.Method, requestsURL)
	fmt.Println(time.Since(start))

	w.Write([]byte("\t<<< " + requestsURL))
}

docker部分：

docker-compose.yml

version: '3.9'

services:
  server:
    image: helloserver:latest
    ports:
      - "8090:8080"
    networks:
      - overlay
    volumes:
      - data:/data
    deploy:
      mode: replicated
      replicas: 3
      endpoint_mode: vip
      restart_policy:
        delay: 10s
        max_attempts: 3

volumes:
  data:

networks:
  overlay:

Dockerfile

FROM golang:1.17 AS builder

ENV GOPROXY=https://goproxy.io,direct

WORKDIR /usr/src

COPY go.mod go.mod
COPY main.go main.go
COPY scripts scripts
COPY Makefile Makefile

RUN ls -alh
RUN go mod tidy
RUN make build

# Final image.
FROM alpine:latest AS server

WORKDIR /opt/app

COPY --from=builder /usr/src/server .

ENTRYPOINT ["/opt/app/server"]

将以上文件写好之后，开始运行测试

编译打包：

make docker

部署服务集群

make deploy

测试

curl http://localhost:8080