[LINUX] Easy HTTP server and Systemd autostart settings in Go

On this page, I will post a simple HTTP server code in Go, and systemd will automatically start the program of the Linux (Ubuntu, Archlinux) service.

Simple HTTP server code in Go

$ pwd
$HOME/go/src/SimpleHttp

$ cat SimpleHttp.go
package main

import (
        "fmt"
        "net/http"
)

func SimpleHttpHandler(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, "Simple HTTP server&Installation of Systemd Service")
}

func main() {
        http.HandleFunc("/", SimpleHttpHandler)

        //Start on port 8080
        http.ListenAndServe(":8080", nil)
}

Build SimpleHttp

$ pwd
$HOME/go/src/SimpleHttp

$ tree
.
└── SimpleHttp.go

0 directories, 1 file

$ go build SimpleHttp.go

$ tree
.
├── SimpleHttp
└── SimpleHttp.go

0 directories, 2 files

Contents of the unit file SimpleHttp.service

$ cat /lib/systemd/system/SimpleHttp.service 
[Unit]
Description = SimpleHttp.service daemon

[Service]
Environment="GOPATH=$HOME/go"
ExecStart=$HOME/go/src/SimpleHttp/SimpleHttp
Restart=always
Type=simple
User=ubuntu
Group=ubuntu
# Other directives omitted
# (file size)
LimitFSIZE=infinity
# (cpu time)
LimitCPU=infinity
# (virtual memory size)
LimitAS=infinity
# (open files)
LimitNOFILE=64000
# (processes/threads)
LimitNPROC=64000

[Install]
WantedBy = multi-user.target

Reloading the SimpleHttp service

Always run the following command after creating or modifying a new unit file, SimpleHttp.service.

sudo systemctl daemon-reload

Enable SimpleHttp service

$ sudo systemctl enable SimpleHttp.service

Start SimpleHttp service

$ sudo systemctl start SimpleHttp.service

Stop SimpleHttp service

sudo systemctl stop SimpleHttp.service

Disabling the SimpleHttp service

$ sudo systemctl disable SimpleHttp.service

Check Arch Linux version

$ uname -a
Linux arch.local 5.6.10-arch1-1 #1 SMP PREEMPT Sat, 02 May 2020 19:11:54 +0000 x86_64 GNU/Linux

$ lsb_release -a
LSB Version:	1.4
Distributor ID:	Arch
Description:	Arch Linux
Release:	rolling
Codename:	n/a

Check Ubuntu version

$ uname -a
Linux ip-172-31-8-186 5.3.0-1017-aws #18~18.04.1-Ubuntu SMP Wed Apr 8 15:12:16 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.4 LTS"

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic