Implementation of two basic images for Docker deployment of Go

1. golang:latest base image

mkdir gotest
touch main.go
touch Dockerfile

1. Example code

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
        fmt.Fprint(writer, "Hello World")
    })
    fmt.Println("3000!!")
    log.Fatal(http.ListenAndServe(":3000", nil))
}

2. Dockerfile configuration

#Source image FROM golang:latest
#Set the working directory WORKDIR $GOPATH/src/github.com/gotest
#Add the server's go project code to the docker container ADD . $GOPATH/src/github.com/gotest
#go build executable file RUN go build .
#Expose port EXPOSE 3000
#Finally run the docker command ENTRYPOINT ["./gotest"]

3. Packaging the image

docker build -t gotest .

• The golang:latest compilation process actually builds a go development environment in the container.
• This source image package is about 800M, which is relatively large.

2. alpine:latest base image

1. The general process of using this image is to package the go program into a binary file on the Linux machine, then drop it into the apine environment and execute the compiled file.
2. By default, Go's runtime environment variable CGO_ENABLED=1, which means cgo is started by default, allowing you to call C code from Go code. CGO can be disabled by setting CGO_ENABLED=0. So you need to execute: CGO_ENABLED=0 go build .
3. This base image is only 13M in size, which is very small.

#Source image FROM alpine:latest
#Set the working directory WORKDIR $GOPATH/src/github.com/common
#Add the server's go project code to the docker container ADD . $GOPATH/src/github.com/common
#Expose port EXPOSE 3002
#Finally run the docker command ENTRYPOINT ["./common"]

Packaging image

docker build -t common .

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