在centos下systemctl status nginx启动nginx出现Unit nginx.service could not be found.

编译安装nginx 后，systemctl启动nginx会出现：

[root@localhost ~]# systemctl status nginx
Unit nginx.service could not be found.

错误的原因就是没有添加nginx服务，所以启动失败。

解决方法：

1. 在/root/etc/init.d/目录下新建文件，文件名为nginx

　　或者用命令在根目录下执行:vim /etc/init.d/nginx

2.    插入以下代码 

#!/bin/sh
# nginx - this script starts and stops the nginx daemin
#
# chkconfig:   - 85 15
 
# description:  Nginx is an HTTP(S) server, HTTP(S) reverse \
#               proxy and IMAP/POP3 proxy server
 
# processname: nginx
# config:      /usr/local/nginx/conf/nginx.conf
# pidfile:     /usr/local/nginx/logs/nginx.pid
 
# Source function library.
 
. /etc/rc.d/init.d/functions
 
# Source networking configuration.
 
. /etc/sysconfig/network
 
# Check that networking is up.
 
[ "$NETWORKING" = "no" ] && exit 0
 
nginx="/usr/local/nginx/sbin/nginx"
 
prog=$(basename $nginx)
 
NGINX_CONF_FILE="/usr/local/nginx/conf/nginx.conf"
 
lockfile=/var/lock/subsys/nginx
 
start() {
 
    [ -x $nginx ] || exit 5
 
    [ -f $NGINX_CONF_FILE ] || exit 6
 
    echo -n $"Starting $prog: "
 
    daemon $nginx -c $NGINX_CONF_FILE
 
    retval=$?
 
    echo
 
    [ $retval -eq 0 ] && touch $lockfile
 
    return $retval
 
}
 
 
stop() {
 
    echo -n $"Stopping $prog: "
 
    killproc $prog -QUIT
 
    retval=$?
 
    echo
 
    [ $retval -eq 0 ] && rm -f $lockfile
 
    return $retval
 
}
 
 
 
restart() {
 
    configtest || return $?
 
    stop
 
    start
 
}
 
 
reload() {
 
    configtest || return $?
 
    echo -n $"Reloading $prog: "
 
    killproc $nginx -HUP
 
    RETVAL=$?
 
    echo
 
}
 
force_reload() {
 
    restart
 
}
 
 
configtest() {
 
  $nginx -t -c $NGINX_CONF_FILE
 
}
 
 
 
rh_status() {
 
    status $prog
 
}
 
 
rh_status_q() {
 
    rh_status >/dev/null 2>&1
 
}
 
case "$1" in
 
    start)
 
        rh_status_q && exit 0
        $1
        ;;
 
    stop)
 
 
        rh_status_q || exit 0
        $1
        ;;
 
    restart|configtest)
        $1
        ;;
 
    reload)
        rh_status_q || exit 7
        $1
        ;;
 
 
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
 
 
    condrestart|try-restart)
 
        rh_status_q || exit 0
            ;;
 
    *)
 
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
        exit 2
 
esac

3.依此执行以下命令

cd /etc/init.d    #进入此目录
chmod 755 /etc/init.d/nginx    #将nginx文件权限改为755
chkconfig --add nginx
service nginx start    #开启nginx
systemctl status nginx    #此时运行systemctl没有报错