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问题:

I want to run a shell script every time my nginx server receives any HTTP request. Any simple ways to do this?

回答1:

You can execute a shell script via Lua code from the nginx.conf file to achieve this. You need to have the HttpLuaModule to be able to do this.

Here's an example to do this.

location /my-website {
  content_by_lua_block {
    os.execute("/bin/myShellScript.sh")
  } 
}

回答2:

I found the following information online at this address: https://www.ruby-forum.com/topic/2960191

This does expect that you have fcgiwrap installed on the machine. It is really as simple as:

sudo apt-get install fcgiwrap

Example script (Must be executable)

#!/bin/sh
# -*- coding: utf-8 -*-
NAME=`"cpuinfo"`
echo "Content-type:text/html\r\n"
echo "<html><head>"
echo "<title>$NAME</title>"
echo '<meta name="description" content="'$NAME'">'
echo '<meta name="keywords" content="'$NAME'">'
echo '<meta http-equiv="Content-type"
content="text/html;charset=UTF-8">'
echo '<meta name="ROBOTS" content="noindex">'
echo "</head><body><pre>"
date
echo "\nuname -a"
uname -a
echo "\ncpuinfo"
cat /proc/cpuinfo
echo "</pre></body></html>"

Also using this as an include file, not restricted to only shell scripts.

location ~ (\.cgi|\.py|\.sh|\.pl|\.lua)$ {
    gzip off;
    root /var/www/$server_name;
    autoindex on;
    fastcgi_pass unix:/var/run/fcgiwrap.socket;
    include /etc/nginx/fastcgi_params;
    fastcgi_param DOCUMENT_ROOT /var/www/$server_name;
    fastcgi_param SCRIPT_FILENAME /var/www/$server_name$fastcgi_script_name;
}

I found it extremely helpful for what I am working on, I hope it help you out with your RaspberryPI project.

回答3:

Install OpenResty (OpenResty is just an enhanced version of Nginx by means of addon modules ) Refer https://openresty.org/en/getting-started.html for this
Configure aws cli on the instance
Write a shell script which download a file from specified S3 bucket
Do the required changes in nginx.conf file
Restart the nginx server

I have tested the http request using curl and file gets download in /tmp directory of respective instance:

curl -I http://localhost:8080/

OutPut:

curl -I http://localhost:8080/
HTTP/1.1 200 OK
Server: openresty/1.13.6.2
Date: Tue, 14 Aug 2018 07:34:49 GMT
Content-Type: text/plain
Connection: keep-alive

Content of nginx.conf file:

worker_processes  1;
error_log logs/error.log;
events {
    worker_connections 1024;
}
http {
    server {
        listen 8080;
        location / {
           default_type text/html;
           content_by_lua '
                ngx.say("<p>hello, world</p>")
           ';
        }

        location / {
            content_by_lua_block{
            os.execute("sh /tmp/s3.sh")
            }
        }

    }
}