下载地址：http://nginx.org/en/download.html

yum -y install make zlib zlib-devel pcre pcre-devel gcc-c++ libtool  openssl openssl-devel
mkdir /usr/local/src/
cd /usr/local/src/
wget http://nginx.org/download/nginx-1.21.6.tar.gz
tar -zxvf nginx-1.21.6.tar.gz
cd nginx-1.21.6
./configure
make && make install

cd /lib/systemd/system/
vim nginx.service

[Unit]
Description=nginx service
After=network.target 
[Service] 
Type=forking 
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s quit
PrivateTmp=true 
[Install] 
WantedBy=multi-user.target

systemctl enable nginx && systemctl start nginx

-----------------------------------------查看版本
编译安装  --> nginx -V  
yum源安装 --> rpm -qa | grep nginx  
---------------------------------------------------默认配置文件/usr/local/nginx/conf  /etc/nginx/nginx.conf
默认主页：/usr/share/doc/HTML/index.html
export PATH=$PATH:/usr/local/nginx/sbin
===========================================================
connect() to connect() failed (13: Permission denied)
解决如下：/usr/sbin/setsebool httpd_can_network_connect=1
-------------------------------------------------------------------
bind() to 0.0.0.0:5499 failed (13: Permission denied)
解决如下：setenforce 0    （关闭selinux）
-------------------------------------------------------------------
webservice地址名没有端口号或与原地址不符合
解决：
upstream localhost {
   server 172.20.123.208:7071;
   server 172.20.123.208:7072;  #访问机率server localhost:9999 weight=5; 
}
server {
    listen       5499;
    server_name  172.20.123.231;

    location / {
        proxy_set_header Host $host:$server_port;  #soad location 变为默认80端口与原地址端口不符合 172.20.123.231:5499
        proxy_pass   http://localhost;
    }   
}

-----------------------------------------------------------
nginx服务器地址及端口：127.0.0.1:80
后端服务地址及端口：127.0.0.1:8080
测试URL：http://127.0.0.1:80/api/upload
location /api/ {
    proxy_pass http://127.0.0.1:8080/;  #实际访问：http://127.0.0.1:8080/upload
}
location /api {
    proxy_pass http://127.0.0.1:8080/;  #实际访问：http://127.0.0.1:8080//upload
}
location /api/ {
    proxy_pass http://127.0.0.1:8080;   #实际访问：http://127.0.0.1:8080/api/upload
}
location /api {
    proxy_pass http://127.0.0.1:8080;   #实际访问：http://127.0.0.1:8080/api/upload
}
location /api/ {
    proxy_pass http://127.0.0.1:8080/server/;   #实际访问：http://127.0.0.1:8080/server/upload
}
location /api {
    proxy_pass http://127.0.0.1:8080/server/;   #实际访问：http://127.0.0.1:8080/server//upload
}
location /api/ {
    proxy_pass http://127.0.0.1:8080/server;    #实际访问：http://127.0.0.1:8080/serverupload
}
location /api {
    proxy_pass http://127.0.0.1:8080/server;    #实际访问：http://127.0.0.1:8080/server/upload
}
--总结--proxy_pass后有目录(包括 / )，去除location匹配
===========================================================