linux安装nginx，配置系统文件，配置systemctl命令，亲测可用，

先安装gcc-c++编译器

yum install gcc-c++

yum install -y openssl openssl-devel

安装pcre包

yum install -y pcre pcre-devel

安装zlib包

yum install -y zlib zlib-devel

在/usr/local/创建nginx文件

mkdir /usr/local/nginx

进入nginx目录

cd /use/local/nginx

下载nginx安装包

wget https://nginx.org/download/nginx-1.19.9.tar.gz

注：如果没有wget命令，就安装命令

yum install wget

解压安装包

tar -zxvf nginx-1.19.9.tar.gz

cd nginx-1.19.9

执行以下三个命令

./configure

make

make install

添加到系统服务中

vim /etc/profile

最后加入配置

export PATH=/usr/local/nginx/sbin:$PATH

重载配置

source /etc/profile

添加systemctl命令

vi /usr/lib/systemd/system/nginx.service

添加内容

[Unit]
Description=nginx - web server
After=network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
PIDFile=/usr/local/nginx/logs/nginx.pid
ExecStartPre=/usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf
ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s stop
ExecQuit=/usr/local/nginx/sbin/nginx -s quit
PrivateTmp=true
[Install]
WantedBy=multi-user.target

重新加载系统服务

systemctl daemon-reload

启动服务

systemctl start nginx

停止服务

systemctl stop nginx

重启服务

systemctl restart nginx

重载配置文件

nginx -s reload