先上go http 服务代码

package main

import (

"fmt"
"net"
"net/http"
"os"
"strconv"
"time"

)

var (

g_localip string

)

func main() {

var (
    port      = 8080
    host_addr string
    err       error
)
if len(os.Args) >= 2 {
    if port, err = strconv.Atoi(os.Args[1]); err != nil {
        fmt.Printf("param2 [%s] must in (1~65535)", os.Args[1])
        return
    }
}
g_localip = getLocalIP()
host_addr = fmt.Sprintf(":%d", port)
fmt.Printf("%s start httpsvr at [%s]", g_localip, host_addr)
http.HandleFunc("/", mainHandle)

http.ListenAndServe(host_addr, nil)

}

func mainHandle(w http.ResponseWriter, r *http.Request) {

var (
    temp string
)
temp = fmt.Sprintf("%s, welcome! \ncurrent service machie is [%s], service time is [%s]",
    r.RemoteAddr, g_localip, formatTime())
w.Write([]byte(temp))

}

func formatTime() string {

return fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d.%03d", time.Now().Year(),
    time.Now().Month(), time.Now().Day(), time.Now().Hour(), time.Now().Minute(),
    time.Now().Second(), time.Now().Nanosecond()/1e6)

}

func getLocalIP() string {

var (
    addrs   []net.Addr
    err     error
    address net.Addr
    ipnet   *net.IPNet
    ok      bool
)

if addrs, err = net.InterfaceAddrs(); err != nil {
    return ""
}
for _, address = range addrs {
    if ipnet, ok = address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
        if ipnet.IP.To4() != nil {
            return ipnet.IP.String()
        }
    }
}
return ""

}

将上面的代码编译成http_test并放到/opt/http_test/目录下

进入下面目录

cd /etc/systemd/system/

创建一个名为httptest.service文件，内容填写如下

[Unit]
Description=httptest service
After=network.target

[Service]
Type=simple
ExecStart=/opt/http_test/http_test 8080 &
ExecStop=/bin/kill-s QUIT $MAINPID
User=root
Restart=on-abort

[Install]
WantedBy=multi-user.target

针对刚刚创建的文件添加执行权限

chmod 754 httptest.service

上面节点的含义分别如下

Description服务的简单描述

After依赖，仅当依赖的服务启动之后再启动自定义的服务单元

ExecStart 默认开启8080端口

sudo systemctl daemon-reload
sudo systemctl enable httptest.service
sudo systemctl start httptest.service

--permanent永久生效，没有此参数重启后失效,防火墙打开8080端口，同时刷新防火墙

firewall-cmd --zone=public --add-port=8080/tcp --permanent
firewall-cmd --reload