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sudo apt install -o DPkg::Options::="--force-overwrite" libodbcinst2 unixodbc-common

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Use VSCode on browser from a virtual machine

You simply have to install vscode's code CLI on the virtual machine. Use this command:

curl -Lk 'https://code.visualstudio.com/sha/download?build=stable&os=cli-alpine-x64' --output vscode_cli.tar.gz
tar -xf vscode_cli.tar.gz
cd vscode_cli
./code tunnel

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{
  "swagger": "2.0",
  "info": {
    "version": "1.0.0",
    "title": "Petstore",
    "description": "The Petstore API but using Express.js",
    "license": {
      "name": "MIT",
      "url": "https://opensource.org/licenses/MIT"
    }

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command > /dev/null 2>&1

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Remove all dangling images docker image prune -a

Remove all unused images, volumes, and networks

docker system prune --all

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How Nginx Works

Nginx works using configuration files. You define a configuration for a single site or all the sites in a machine and Nginx serves the content of that defined site. In the past, folks defined new sites in the /etc/nginx/sites-available and /etc/nginx/sites-enabled directories. These days, Nginx suggests that you use the conf.d directory. The default Nginx config serves the default Nginx page, i.e. welcome to Nginx. But you can easily replace it with something simple that reverse proxies your requests. Something like this:

http {
    server {
        listen 80;

 location / {

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def get_file_content(filelocation):
    try:
        with open(filelocation, "r") as file:
            content = file.read()
            return content
    except FileNotFoundError:
        print("The file was not found.")
    except PermissionError:
        print("Permission denied.")
    except Exception as e:

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Networking Notes

A bunch of notes about networking related concepts such as TCP/IP, DNS, BGP, OSPF, etc.

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Bunch of Algo Solutions

This gist contains a bunch of algo solutions

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Cisco IOS Images for GNS3

Working the CCNA exams with GNS3 software is a great way. But, you need Cisco IOS images for GNS3.

You can use many Cisco IOS images on GNS3, but most of them may be problematic.

I would recommend reading the related article to download Cisco IOS images running in GNS3.

Cisco IOS Images for GNS3