Go language frequently used command notes

Global install go program(go version >=1.16.0)

• go install sigs.k8s.io/kind@v0.9.0

when go version is higher 1.12 should install godoc command

• go get golang.org/x/tools/cmd/godoc

launch go docs services in local

• godoc -http=:6060

view go environment variables,inlude GO ROOT path

• go env

fmt package Println docs

• go doc fmt Println

initialization go modules, when reference sub directory straightway example.com/module/sub1/sub2

• go mod init example.com/module

delete packages

• go clean -i -v -x github.com/somepkg/go/simpleGitHub

Add modules to current packages

• go mod edit -require github.com/prometheus/common@v0.1.0
• go mod edit -require k8s.io/client-go@0.18.2 or go get k8s.io/client-go@v0.18.2

when use module in local packages.

• go mod edit -replace github.com/acme/bar=/path/to/local/bar
• go mod tidy

reformat codes in current directory

• go fmt

compile specific os binary program

• CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-extldflags "-static"' -o app .

smallest docker images for go program

1    FROM scratch
2    WORKDIR /app
3    COPY ./app .
4    ENTRYPOINT ["./app"]

other practice

• decrement size when build binary: go build -ldflags='-s -w'
• check the override variables: go tool vet main.go
• compile different platform and architecture

1go tool dist list -json
2GOOS=darwin GOARCH=386 go build main.go