shutdown-example-app

main.go

/*
Dockerfile

FROM golang:1.15 AS builder
WORKDIR /shutdown-example-app
COPY main.go /shutdown-example-app
RUN go build -o shutdown-example-app
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o shutdown-example-app .

FROM scratch
WORKDIR /root/
COPY --from=builder /shutdown-example-app .
CMD ["./shutdown-example-app"]
*/


package main

import (
    "fmt"
    "log"
    "os"
    "os/signal"
    "syscall"
    "time"
)

func startWorking() {
    shutdown := make(chan int)

    //create a notification channel to shutdown
    sigChan := make(chan os.Signal, 1)

    go func() {
        for {
            log.Println(fmt.Sprintf("Working %s", time.Now().String()))
            time.Sleep(1 * time.Second)
        }
    }()

    signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)

    go func() {
        <-sigChan
        for {
            log.Println(fmt.Sprintf("Got SIGTERM Shutdown %s", time.Now().String()))
            time.Sleep(1 * time.Second)
            continue
        }
    }()

    <-shutdown

}

func main() {
    log.Println("Started shutdown-example-app")
    startWorking()
}