'How to run a shell script on every request?

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

shellnginx


Solution 1:[1]

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.

Solution 2:[2]

  1. 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
  2. Configure aws cli on the instance
  3. Write a shell script which download a file from specified S3 bucket
  4. Do the required changes in nginx.conf file
  5. 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")
            }
        }

    }
}

Solution 3:[3]

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

Solution 4:[4]

You can use nginx's perl module which is usually part of a repo and can be easily installed. Sample to call system curl command:

   location /mint {
       perl '
            sub {
               my $r = shift;
               $r->send_http_header("text/html");
               $r->print(`curl -X POST --data \'{"method":"evm_mine"}\' localhost:7545`);
               return OK;
            }
       '; 
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Boiethios
Solution 3 kierzo
Solution 4 Andrei .F

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