nginx - How to run a shell script on every request?

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

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温柔的废话

2020-12-04 13:34
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")
  } 
}
```
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太阳男子

2020-12-04 13:40

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.

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隐瞒了意图╮

2020-12-04 13:42

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")
            }
        }

    }
}

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生来不讨喜

2020-12-04 13:43
You can also use the nginx mirror module and poxy_pass it to a web script that runs whatever, in my case I just added this to my main site location {...
```
mirror /mirror;
mirror_request_body off;
```
and then a new location called mirror that I had run a php script that executed whatever...
```
location = /mirror {
    internal;
    proxy_pass http://localhost/run_script.php;
    proxy_pass_request_body off;
    proxy_set_header Content-Length "";
    proxy_set_header X-Original-URI $request_uri;
}
```
https://nginx.org/en/docs/http/ngx_http_mirror_module.html
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