ubuntu 安装两个nginx实例时的坑，非默认nginx实例配置修改总也不生效的问题
一、问题
由于工作需求xx云服务器上安装了两个nginx实例，突然有一天需要在非默认nginx上增加一个子站点，根据网上教程和原来的记录修改vi nginx.conf 后保存载总也不生效？
怎么破？
二、过程记录
假如：非默认nginx安装在 /usr/local/nginx
那么我 第一步：cd 到/usr/local/nginx
第二步：nginx -s reload
第三步：sbin/nginx -c conf/nginx.conf
理论上是没有错的，初始没有任务效果
三、解决要点
我们始终要头脑清醒，不管当前在什么目录，默认命令肯定是招待默认实例
即便当前目标是 非默认实例nginx路径，如果不指定路径，直接键入 nginx命令依然指向默认实例
所以：
假如：非默认nginx安装在 /usr/local/nginx
那么我 第一步：cd 到/usr/local/nginx
第二步： ./nginx -s reload
第三步：sbin/nginx -c conf/nginx.conf
指定相对路径nginx路径配置生效：
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# ./nginx -s reload
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# sbin/nginx -c conf/nginx.conf--------------------------------
ot@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# nginx -s reload
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# ./nginx -s reload
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# ./nginx -c ./conf/nginx.conf
nginx: [emerg] mkdir() "./html/hls" failed (2: No such file or directory)
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# ./nginx -c ../conf/nginx.conf
nginx: [emerg] open() "/usr/local/nginx/../conf/nginx.conf" failed (2: No such file or directory)
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx/sbin# cd ../
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# ls
client_body_temp conf fastcgi_temp html logs proxy_temp sbin scgi_temp uwsgi_temp
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# sgin/nginx -c conf/nginx.conf
-bash: sgin/nginx: No such file or directory
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# sbin/nginx -c conf/nginx.conf
nginx: [emerg] bind() to 0.0.0.0:1935 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1110 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1111 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1112 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1113 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1114 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1115 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1116 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1117 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1118 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1119 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:8022 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1935 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1110 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1111 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1112 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1113 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1114 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1115 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1116 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1117 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1118 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1119 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:8022 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1935 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1110 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1111 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1112 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1113 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1114 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1115 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1116 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1117 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1118 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1119 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:8022 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1935 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1110 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1111 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1112 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1113 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1114 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1115 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1116 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1117 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1118 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1119 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:8022 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1935 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1110 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1111 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1112 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1113 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1114 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1115 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1116 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1117 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1118 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:1119 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:8022 failed (98: Address already in use)
nginx: [emerg] still could not bind()
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# telnet 127.0.0.1 1116
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Connection closed by foreign host.
root@iZuf644aq2mn3ba0k4ain8Z:/usr/local/nginx# 要点是 第二步 “./”
第二步： ./nginx -s reload
只有增加"./" 才是指向实际 指定路径的 nginx 只要不加 “./” 或类似等同的路径限定符，都是默认nginx实例 nginx -s reload 兄弟们就是执行N次都是依然不生效
四、总结
多nginx实例 时要点是 除了 默认实例外，始终要有路径限定符的概念，不可大意，不要迷糊，在此备忘，同时希望可以帮到兄弟们！不是能力问题，是实践问题！
五、拓展
同理，我们默认控制nginx 开，关，状态查询命令,如下命令，如果不指定路径限定符，始终是默认实例状态，开，停，而不是非默认实例，
systemctl status nginx
systemctl start nginx
systemctl stop nginx
我们即要习惯默认实例的常用 命令，也要适应多个实例，非默认实例的路径限定关系
正常的步骤应当是
cd 到/usr/local/nginx
systemctl status ./nginx
systemctl start ./nginx
systemctl stop ./nginx