Docker and Docker-Compose on Ubuntu

In this tutorial, let’s learn how to install and set up Docker and Docker-Compose on Ubuntu

Docker

• It is an open platform for developing, shipping, and running applications
• In short, it provides the ability to package and run an application in a loosely isolated environment called a container
• Further, Containers are lightweight and contain everything needed to run the application
• As a result of this, they use fewer resources compared to Virtual Machines

Docker Compose

• It is a tool for defining and running multi-container Docker applications
• It requires a single configuration file for all services (in YAML)
• Due to this, the configuration is cached whenever possible. In other words, this speeds up further operations on containers
• When a service that has not changed is restarted, it re-uses the existing containers

Read more on Docker and Docker Compose here:
https://docs.docker.com/get-started/overview/
https://docs.docker.com/compose/

Steps to install Docker on Ubuntu

1. Update the apt repository and install the required package

# Update the apt repository
sudo apt-get update

# Install the required packages
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

2. Next, add Docker’s official GPG Key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3. Set up the stable repo according to the Operating System Architecture. Run the respective command based on OS Architecture

# For x86_64 / amd64
echo \
"deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# For armhf
echo \
"deb [arch=armhf signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# For arm64
echo \
"deb [arch=arm64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

4. Update apt and install the latest version of Docker Engine

# Update the apt repository
sudo apt-get update

# Install Docker engine and required components
sudo apt-get install docker-ce docker-ce-cli containerd.io

5. Finally enable docker service to Start on boot

sudo systemctl enable docker.service
sudo systemctl enable containerd.service

Setup Docker for non root user

# Create docker group (if not present)
sudo groupadd docker

# Add non root user to the docker group
sudo usermod -aG docker $USER

# Activate Changes
newgrp docker

# Reboot to apply all changes
sudo reboot now

# Test by running below command without sudo
docker run hello-world

Steps to install Docker Compose on Ubuntu

1. Install python3 and pip

sudo apt install python3 python3-pip

2. Once it is done, Install Docker Compose using pip

sudo pip install docker-compose

Congratulations!!! You have successfully installed Docker and Docker-Compose on your Ubuntu machine

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