docker打包golang应用的过程分析

package main
 
import (
    "fmt"
    "net/http"
)
 
func main() {
    server := &http.Server{
        Addr: ":8888",
    }
 
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintln(w, "hello world")
    })
 
    fmt.Println("server startup...")
    if err := server.ListenAndServe(); err != nil {
        fmt.Printf("server startup failed, err:%v\n", err)
    }
}

FROM       docker.io/alpine:latest
MAINTAINER demo <juest a demo>
 
#alpine内的包管理
RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories
#安装bash
RUN apk add --update bash && rm -rf /var/cache/apk/*
 
RUN mkdir -p /data/go
COPY hello /data/go
 
EXPOSE 8888
 
ENTRYPOINT ["/data/go/hello"]

docker build -t demo/go-hello:1.0 -f dockerfile .

FROM docker.io/golang:alpine
 
RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories
RUN apk add --update bash && rm -rf /var/cache/apk/*
 
# 为我们的镜像设置必要的环境变量
ENV GO111MODULE=on \
    CGO_ENABLED=0 \
    GOOS=linux \
    GOARCH=amd64\
    GOPROXY=https://goproxy.cn,direct

docker build -t go-build:1.0 -f dockerfile .

#xxx为本地go代码路径
docker run -it --rm -v xxx:/data/go demo/go-build:1.0 /bin/bash
cd /data/go
go build hello.go

FROM       docker.io/alpine:latest
MAINTAINER demo <juest a demo>
 
#alpine内的包管理
RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories
#安装bash
RUN apk add --update bash && rm -rf /var/cache/apk/*
 
RUN mkdir -p /data/go
COPY hello /data/go
 
EXPOSE 8888
 
ENTRYPOINT ["/data/go/hello"]

docker build -t demo/go-hello:1.0 -f dockerfile2 .

FROM      scratch
MAINTAINER demo <juest a demo>
 
COPY hello /
 
EXPOSE 8888
 
ENTRYPOINT ["/hello"]

docker build -t demo/go-hello:2.0 -f dockerfile3 .

# Support setting various labels on the final image
ARG COMMIT=""
ARG VERSION=""
ARG BUILDNUM=""
 
# Build Geth in a stock Go builder container
FROM golang:alpine as builder
 
RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories
RUN apk add --no-cache gcc musl-dev linux-headers git
 
ENV GO111MODULE=on \
    CGO_ENABLED=0 \
    GOOS=linux \
    GOARCH=amd64\
    GOPROXY=https://goproxy.cn,direct
 
# Get dependencies - will also be cached if we won't change go.mod/go.sum
COPY go.mod /web/
COPY go.sum /web/
RUN cd /web && go mod download
 
ADD . /web
RUN cd /web && go build -o ./cmd/app main.go
 
# Pull Geth into a second stage deploy alpine container
FROM alpine:latest
 
RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories
RUN apk add --no-cache ca-certificates
COPY --from=builder /web/cmd/app /usr/local/bin/
 
EXPOSE 8080
ENTRYPOINT ["app"]
 
# Add some metadata labels to help programatic image consumption
ARG COMMIT=""
ARG VERSION=""
ARG BUILDNUM=""
 
LABEL commit="$COMMIT" version="$VERSION" buildnum="$BUILDNUM"