Docker Go Project Deployment Practice Guide

Prepare Go Web Code

package main

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

func sayHello(w http.ResponseWriter, r *http.Request) {
	_, _ = fmt.Fprintf(w, "Hello PFinal")
}
func getConfig(w http.ResponseWriter, r *http.Request) {
	appId := r.FormValue("app_id")
	if appId == "" {
		_, _ = fmt.Fprintf(w, "Please provide a parameter")
		return
	}
	_, _ = fmt.Fprintf(w, "Get corresponding config: " + appId)
}

func main() {
	http.HandleFunc("/", sayHello)
	http.HandleFunc("/get_config", getConfig)
	log.Println("[Default Project] Service started successfully, listening on port 8989")
	er := http.ListenAndServe("0.0.0.0:8989", nil)
	if er != nil {
		log.Fatal("ListenAndServe: ", er)
	}
}

The above code provides services externally via port 8989.

Write Dockerfile

Multi-stage build, only keeping the binary file to reduce image size. Use golang:alpine as the build image to compile the binary, then use scratch to generate a simple and very small new image.

FROM golang:alpine AS builder

# Set necessary environment variables for our image
ENV GO111MODULE=on \
    CGO_ENABLED=0 \
    GOOS=linux \
    GOARCH=amd64

WORKDIR /build

COPY . .

RUN go mod init app && go mod tidy

RUN go build -o app .

WORKDIR /dist

RUN cp /build/app .

# EXPOSE 8989
# CMD ["/dist/app"]

###################
# Create a small image
###################
FROM scratch
COPY --from=builder /build/app /
EXPOSE 8989
ENTRYPOINT ["/app"]

Build Image

docker build . -t web

After building, run locally and test:

docker run -p 8989:8989 web

curl http://172.31.1.40:8989

Output: Hello PFinal

Tag the Image and Push to Private Registry

docker tag web:latest 172.31.1.40:5000/pfinalclub/web:v1

docker push 172.31.1.40:5000/pfinalclub/web:v1

172.31.1.40:5000 is the private registry address

Docker Private Registry Setup

Check if the Registry Has the Image

curl http://172.31.1.40:5000/v2/_catalog

Output:

{"repositories":["pfinalclub/web"]}

Pull and Run the Image on the Server

• Pull the image

docker pull 172.31.1.40:5000/pfinalclub/web:v1

• Run the image container

docker run -p 8981:8981 127.0.0.1:5000/pfinalclub/web

docker run -p 8981:8982 127.0.0.1:5000/pfinalclub/web