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0x0E. Web stack debugging #1

DevOps SysAdmin Scripting Debugging

B4eeypV

Requirements

General

  • Allowed editors: vi, vim, emacs
  • All your files will be interpreted on Ubuntu 20.04 LTS
  • All your files should end with a new line
  • A README.md file at the root of the folder of the project is mandatory
  • All your Bash script files must be executable
  • Your Bash scripts must pass Shellcheck without any error
  • Your Bash scripts must run without error
  • The first line of all your Bash scripts should be exactly #!/usr/bin/env bash
  • The second line of all your Bash scripts should be a comment explaining what is the script doing
  • You are not allowed to use wget

Tasks

0. Nginx likes port 80

Using your debugging skills, find out what’s keeping your Ubuntu container’s Nginx installation from listening on port 80. Feel free to install whatever tool you need, start and destroy as many containers as you need to debug the issue. Then, write a Bash script with the minimum number of commands to automate your fix.

Requirements:

  • Nginx must be running, and listening on port 80 of all the server’s active IPv4 IPs
  • Write a Bash script that configures a server to the above requirements
root@966c5664b21f:/# curl 0:80
curl: (7) Failed to connect to 0 port 80: Connection refused
root@966c5664b21f:/#
root@966c5664b21f:/# ./0-nginx_likes_port_80 > /dev/null 2&>1
root@966c5664b21f:/#
root@966c5664b21f:/# curl 0:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
root@966c5664b21f:/#

1. Make it sweet and short

Using what you did for task #0, make your fix short and sweet.

Requirements:

  • Your Bash script must be 5 lines long or less
  • There must be a new line at the end of the file
  • You must respect usual Bash script requirements
  • You cannot use ;
  • You cannot use &&
  • You cannot use wget
  • You cannot execute your previous answer file (Do not include the name of the previous script in this one)
  • service (init) must say that nginx is not running ← for real
root@966c5664b21f:/# curl 0:80
curl: (7) Failed to connect to 0 port 80: Connection refused
root@966c5664b21f:/#
root@966c5664b21f:/# cat -e 1-debugging_made_short | wc -l
5
root@966c5664b21f:/# ./1-debugging_made_short
root@966c5664b21f:/# curl 0:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
root@966c5664b21f:/#
root@966c5664b21f:/# service nginx status
 * nginx is not running
root@966c5664b21f:/#