nginx - 您如何正确观看和重新加载 Nginx conf？

Question

我有两个问题：

• 之间有区别吗：nginx -s reload和pkill -HUP -F nginx.pid
• 观察 Nginx conf 文件并在更改时测试 conf 文件（nginx -t）的最简单方法是什么，如果它通过重新加载 Nginx。这可以通过runit主管或像主管这样的流程经理来完成吗？

Answer 1

#!/bin/bash

# NGINX WATCH DAEMON
#
# Author: Devonte
#
# Place file in root of nginx folder: /etc/nginx
# This will test your nginx config on any change and
# if there are no problems it will reload your configuration
# USAGE: sh nginx-watch.sh

# Set NGINX directory
# tar command already has the leading /
dir='etc/nginx'

# Get initial checksum values
checksum_initial=$(tar --strip-components=2 -C / -cf - $dir | md5sum | awk '{print $1}')
checksum_now=$checksum_initial

# Start nginx
nginx

# Daemon that checks the md5 sum of the directory
# ff the sums are different ( a file changed / added / deleted)
# the nginx configuration is tested and reloaded on success
while true
do
    checksum_now=$(tar --strip-components=2 -C / -cf - $dir | md5sum | awk '{print $1}')

    if [ $checksum_initial != $checksum_now ]; then
        echo '[ NGINX ] A configuration file changed. Reloading...'
        nginx -t && nginx -s reload;
    fi

    checksum_initial=$checksum_now

    sleep 2
done

Answer 2

至少在 Unix 上，HUP由于声明代码，“重新加载”动作和信号都被视为一个

ngx_signal_t  signals[] = {
    { ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
      "SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
      "reload",
      ngx_signal_handler },

在src/os/unix/ngx_process.c. 在ngx_signal_handler()相同的通用代码中

    case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
        ngx_reconfigure = 1;
        action = ", reconfiguring";
        break;

被执行，它为一个共同的重新配置做准备。

要在修改文件时触发操作，您可以创建一个crontab并确定检查周期，或者使用inotifywait。

要确定是否nginx -t出错，请检查 bash 文件中的返回码，$?

nginx -t
if [ $? -eq 0 ] then;
    nginx -s reload
fi

注意：您也可以使用service nginx reload

（请参阅此处的返回码检查示例）