使用多段构建制作docker镜像时，我原先的dockerfile如下：
FROM golang:1.18.1-alpine AS build
WORKDIR /httpserver/
COPY ./httpServer.go .
ENV GOPROXY=https://goproxy.cn,direct \
GO111MODULE=on \
CGO_ENABLED=0 \
GOOS=linux \
GOARCH=amd64
RUN go get [github.com/golang/glog](http://github.com/golang/glog) \
&& go build -installsuffix cgo -o ./httpserverv1.1 ./httpServer.go
FROM alpine:latest
COPY --from=build /httpserver/httpserverv1.1 /httpserver/httpserverv1.1
RUN chmod a+x /httpserver/httpserverv1.1
ENTRYPOINT ["/httpserver/httpserverv1.1"]
结果构建时报错了，报错如下，看信息是拉取源码中的第三方依赖包glog报错：
go: go.mod file not found in current directory or any parent directory.
'go get' is no longer supported outside a module.
To build and install a command, use 'go install' with a version,
like 'go install example.com/cmd@latest'
For more information, see https://golang.org/doc/go-get-install-deprecation
or run 'go help get' or 'go help install'.
查了相关的错误信息，说是go get已经在golang的1.17版本停用了，必须使用go install。其实这里有个坑，看官方文档如下：
Starting in Go 1.17, installing executables with go get is deprecated. go install may be used instead.
In Go 1.18, go get will no longer build packages; it will only be used to add, update, or remove dependencies in go.mod. Specifically, go get will always act as if the -d flag were enabled.
httpServer.go:12:2: no required module provides package github.com/golang/glog: go.mod file not found in current directory or any parent directory; see 'go help modules'
其实说的是go get只是不用来build了，他只能在go.mod中做依赖包相关的操作。go install是直接安装package，这里使用go install明显不对。
掌握了了以上信息，就可以针对性的解决了。我之前的dockerfile中可以添加一下go.mod的初始化操作，新的file如下：
FROM golang:1.18.1-alpine AS build
WORKDIR /httpserver/
COPY ./httpServer.go .
ENV GOPROXY=https://goproxy.cn,direct \
GO111MODULE=on \
CGO_ENABLED=0 \
GOOS=linux \
GOARCH=amd64
RUN go mod init httpserver \
&& go get [github.com/golang/glog](http://github.com/golang/glog) \
&& go build -installsuffix cgo -o ./httpserverv1.1 ./httpServer.go
FROM alpine:latest
COPY --from=build /httpserver/httpserverv1.1 /httpserver/httpserverv1.1
RUN chmod a+x /httpserver/httpserverv1.1
ENTRYPOINT ["/httpserver/httpserverv1.1"]
问题解决，构建镜像成功了。
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