gin web框架docker多阶段构建实战-阿里云开发者社区

gin web框架docker多阶段构建实战

2021-10-29 876

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简介： 自从知道有多阶段构建以后，就实战了一把，顺便记录下来，供参考

准备项目

初始化一个项目

# mkdir demobuild
# cd demobuild/
# go mod init gindemo
go: creating new go.mod: module gindemo

编写代码gindemo.go

packagemainimport"github.com/gin-gonic/gin"funcmain() {
r :=gin.Default()
r.GET("/ping", func(c*gin.Context) {
c.JSON(200, gin.H{
"message": "pong",
        })
    })
r.Run("0.0.0.0:9091") // listen and serve on 0.0.0.0:8080}

尝试运行

没运行成功，提示需要安装gin

#gorungindemo.gogindemo.go:3:8: norequiredmoduleprovidespackagegithub.com/gin-gonic/gin; toaddit:
gogetgithub.com/gin-gonic/gin

安装依赖

#gogetgithub.com/gin-gonic/gingoget: addedgithub.com/gin-gonic/ginv1.7.4

再次运行

#gorungindemo.go[GIN-debug] [WARNING] CreatinganEngineinstancewiththeLoggerandRecoverymiddlewarealreadyattached.[GIN-debug] [WARNING] Runningin"debug"mode.Switchto"release"modeinproduction.-usingenv:   exportGIN_MODE=release-usingcode:  gin.SetMode(gin.ReleaseMode)
[GIN-debug] GET/ping-->main.main.func1 (3handlers)
[GIN-debug] ListeningandservingHTTPon0.0.0.0:9091

多阶段构建

编写Dockerfile

FROM golang:1.17 as build
WORKDIR /go/src/gindemo
COPY . .
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOPROXY=https://goproxy.cn,direct go build -ldflags="-w-s" -o gindemo .
FROM ubuntu:18.04
WORKDIR /usr/local/demo
COPY --from=build /go/src/gindemo/gindemo .
EXPOSE9091CMD ["./gindemo"]

查看目录结构

# tree.
|-- Dockerfile
|-- gindemo.go
|-- go.mod
`-- go.sum0 directories, 4 files

执行构建镜像

如果没有多阶段构建，你的操作可能如下:

在本地把go程序编译好，再通过docker的方式拷贝到容器镜像中,那么本地环境是存在差异的
在容器镜像中，先是安装go环境，然后配置go可执行文件环境变量，最后编译，强耦合在一起了

# docker build . -t morebuild:test

检测镜像是否构建成功

# docker images|grep morebuildmorebuild                                              test      4a0218330261   25 seconds ago      69.5MB

项目运行

运行容器

docker run -it-d-p9091:9091 morebuild:test

查看容器内部

45f54为容器运行部分ID

# docker exec -it 45f54 bashroot@45f541ce524f:/usr/local/demo# pwd/usr/local/demo
root@45f541ce524f:/usr/local/demo# lsgindemo
root@45f541ce524f:/usr/local/demo# ps -efUID        PID  PPID  C STIME TTY          TIME CMD
root         10006:13 pts/0    00:00:00 ./gindemo
root        110006:13 pts/1    00:00:00 bashroot        2311006:13 pts/1    00:00:00 ps-ef

curl访问

curl http://127.0.0.1:9091/ping

查看容器日志

# docker logs -f 45f54[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.
[GIN-debug] [WARNING] Running in"debug" mode. Switch to "release" mode in production.
- using env: exportGIN_MODE=release
- using code:  gin.SetMode(gin.ReleaseMode)
[GIN-debug] GET    /ping                     --> main.main.func1 (3 handlers)
[GIN-debug] Listening and serving HTTP on 0.0.0.0:9091
[GIN] 2021/10/29 -06:23:43 | 200 |      58.471µs |      172.17.0.1 | GET      "/ping"

至此已经演示完毕了