systemd socket activation golang demo

service define

rongapp.service

[Unit]

Description=rong Hello World HTTP

Requires=network.target rongapp.socket

After=multi-user.target

​

[Service]

Type=simple

ExecStart=/usr/bin/rong

​

[Install]

WantedBy=multi-user.target

socket define

[Socket]

ListenStream=8076

Accept=yes 

[Install]

WantedBy=sockets.target

main.go

package main

​

import (

 "io"

 "net/http"

​

 "github.com/coreos/go-systemd/activation"

)

​

func HelloServer(w http.ResponseWriter, req *http.Request) {

 io.WriteString(w, "hello socket activated world!\n")

}

​

func main() {

 listeners, err := activation.Listeners()

 if err != nil {

  panic(err)

 }

​

 if len(listeners) != 1 {

  panic("Unexpected number of socket activation fds")

 }

​

 http.HandleFunc("/", HelloServer)

 http.Serve(listeners[0], nil)

}

go mod

go mod init  github.com/rongfengliang/appdemo

gp  get github.com/coreos/go-systemd/activation

start service

• copy define files

location  /usr/lib/systemd/system/

• start socket

systemctl start rongapp.socket

systemctl start rongapp.service

systemctl  enable rongapp.socket

systemctl  enable rongapp.service

test

curl http://127.0.0.1:8076

some links

https://github.com/coreos/go-systemd/tree/master/examples/activation/httpserver