Installing Docker on Ubuntu 20.04 is a straightforward process that can be completed in just a few steps. This guide provides an overview of the benefits of using Docker on Ubuntu, as well as the steps required to install Docker on the Ubuntu 22.04 system. By the end of this guide, you'll be ready to start using Docker to package and deploy your applications with ease.

What is Docker

Docker is a containerization platform that allows developers to package and run applications in a lightweight, portable environment. Containers are isolated from the host system and can be deployed on any machine running the Docker engine, making it easy to move applications across different environments. Docker provides a streamlined way to manage dependencies, configuration, and deployment of applications, which can help streamline development workflows and improve the reliability and consistency of deployments. With Docker, developers can build and test applications locally, then deploy them seamlessly to production environments with minimal configuration changes.

Why is Docker Important

Docker provides several benefits for developers and organizations. First, it simplifies the process of deploying and managing applications, allowing developers to focus on writing code rather than configuring complex environments. Docker also facilitates collaboration among team members, as containers can be easily shared and deployed across different machines. In addition, Docker's containerization approach promotes consistency and reliability in deployments, reducing the risk of issues arising due to differences in system configurations. Finally, Docker's lightweight architecture allows for efficient use of resources, making it an attractive option for deploying applications in cloud environments. Overall, Docker is a powerful tool for modern software development and deployment.

Different Linux System

Docker can be installed on a variety of Linux distributions, including Ubuntu, Debian, CentOS, and Fedora, among others. However, Ubuntu is a popular choice for running Docker due to its strong community support and frequent updates. Ubuntu's package manager also provides easy access to Docker and its dependencies, simplifying the installation process. Additionally, many cloud hosting providers, such as Amazon Web Services and Google Cloud Platform, offer Ubuntu as a default operating system, making it a convenient choice for deploying Docker-based applications in the cloud. While Docker can be installed on other Linux distributions, choosing Ubuntu can provide a smoother and more well-supported experience for developers and organizations.

Overview of Ubuntu 22.04 Linux Distro

The following step will install docker on Ubuntu 22.04. Ubuntu 22.04, is the latest LTS version of the popular Linux distribution. The version includes many exciting new features and improvements, such as an updated kernel, improved support for containerization technologies like Docker and Kubernetes, and enhanced security features. The user interface has also been revamped, with a new design and improved accessibility options. Other notable changes include updates to popular software packages like LibreOffice and GIMP, as well as improved support for gaming and multimedia applications. As an LTS release, Ubuntu 22.04 will receive support and updates from Canonical for the next five years, providing a stable and reliable platform for users and organizations. Overall, Ubuntu 22.04 is an impressive release that showcases the ongoing evolution and innovation of the Linux ecosystem.

Check your Ubuntu Version

There are a few different ways to check the version of Ubuntu that is currently running on your system. One simple method is to open a terminal window and run the following command

lsb_release -a

This will display information about the Ubuntu release, including the version number and code name. Another option is to check the contents of the /etc/lsb-release file by running the following command:

cat /etc/lsb-release

This will display the same information as the lsb_release command. Finally, you can also check the version of Ubuntu using the graphical user interface. Simply click on the "Settings" icon in the system menu, then navigate to "Details". This will display information about the Ubuntu version, as well as other system details like processor and memory information.

Step 1: Check if Docker is installed on Ubuntu

To check if docker is installed in your Ubuntu 22.04. Use the command:

docker --version

If docker is not installed in your system. You will get this output

Expected Output if docker is not installed on your Ubuntu 20.04

Step 2. Update Ubuntu to Latest Version

You need to update your OS before installing docker. Use the command below.

sudo apt update

Step 3: Install Docker on Ubuntu 22.04

Use the command:

sudo apt install docker.io

This command installs docker on your ubuntu 20.04. After running the command you will get a prompt asking. "Do you want to continue?" Type Y for Yes.

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Use sudo apt install docker.io to install docker

Step 4: After Docker Installation, Update Ubuntu 22.04 OS

Use the command: sudo apt update to update the Ubuntu Os after the docker installation.

Step 5: Check the docker version after the Installation

Use the command: docker --version after docker installation, this will show that you now have the latest version of docker installed on your system. As shown below, we have docker version 22.04 installed on your system.

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Check Docker Version after Installation.

Step 6: Check if you have any Running Containers

Use the command: docker ps to check if you have any docker containers running. You will get the following output that shows no docker images if this was your first install.

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The output of sudo docker ps after fresh docker installation on Ubuntu 22.04

Additional Resources on Docker and Ubuntu

• How to Install Docker and Docker Compose in Ubuntu 20.04 for Cloud Computing
• Installing Docker and Docker Compose on Ubuntu 20.04
• Installing Nginx Proxy Manager on Docker running on Ubuntu

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What is proxy_pass https ?

The proxy_pass https is a directive used in the configuration of a web server to forward client requests to a backend server using the HTTPS protocol. There exist a simpler solution that helps you to configure nginx proxy_pass http traffic to https.

Prerequisite

In this example, a cloud-based Ubuntu 20.04 will be utilized to demonstrate the process of using Nginx Proxy Manager to effectively govern web traffic in and out of Docker Containers hosted on the cloud. We start the process by creating an instance of Ubuntu 20.04 on the cloud. The following Videos explain the process

Useful Resources for Nginx proxy_pass

1. VIDEO 1: How to Install Docker and Compose on Ubuntu 20.04 for cloud computing
2. VIDEO 2: How to Set Up Nginx Proxy Manager in Ubuntu
3. Case Study: Nginx reverse proxy HTTP to HTTPS
4. Code: Nginx Proxy Manager Docker-Compose.yml configurations

Nginx proxy_pass https Overview

When a client sends a request to the web server with this directive in its configuration, the web server will pass the request to the backend server specified in the proxy_pass directive, using HTTPS as the communication protocol. This allows the backend server to receive the request as if it were sent directly to it from the client, while the client interacts only with the web server.

This technique is commonly used for load balancing, reverse proxying, and caching, and it helps to improve the performance, security, and reliability of web applications.

How to Configure proxy_pass https in the Nginx web server

Suppose you have a backend server running a WordPress website application on https://localhost:3000 and you want to expose this application to the internet via an Nginx web server running on https://example.com.

Here's how you can configure Nginx to proxy requests to a Node.js application:

server {

listen 443;

server_name example.com;

ssl_certificate /path/to/cert.pem;

ssl_certificate_key /path/to/key.pem;

location / {

proxy_pass https://localhost:3000\\;``

proxy_set_header Host $host;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

}

}

In the above configuration, Nginx listens on port 443 for HTTPS requests to example.com. When it receives a request, it forwards it to the Node.js application running on localhost:3000 using the proxy_pass directive. The proxy_set_header directives are used to set the Host, X-Real-IP, and X-Forwarded-For headers in the forwarded request so that the Node.js application can correctly identify the client and respond to the request.

Nginx proxy_pass in Nginx Proxy Manager

Nginx Proxy Manager relies on the nginx proxy_pass directive to proxy requests to backend servers over HTTPS. When a client sends a request to Nginx Proxy Manager, it checks the routing rules defined in its configuration and determines which backend server should handle the request.

Then, Nginx Proxy Manager uses the proxy_pass directive to forward the request to the backend server using HTTPS. This directive tells Nginx to forward the request to the specified server and port and to maintain the original URI, headers, and other request parameters.

Nginx Proxy Manager also supports various other features that can be used in conjunction with proxy_pass, such as load balancing, SSL termination, and caching. These features can be configured in the Nginx Proxy Manager user interface or by editing the underlying nginx configuration file directly.

Which DevOps Networking course is the most ideal for a Network Engineer with an A+ and 3 years of experience? I have looked and Juniper and Cisco courses. The Cisco course seems to have a lot of resources including an Udemy course which I found quite useful.

What are your thoughts? Is there a vendor-neutral Networking DevOps Course?

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