98 lines
3.3 KiB
Markdown
98 lines
3.3 KiB
Markdown
# 🐳 How to Install and Use Docker on Ubuntu 22.04
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A step-by-step guide to installing Docker Community Edition (CE) on Ubuntu 22.04, based on the [DigitalOcean Tutorial](https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-22-04).
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---
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## 📋 Table of Contents
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- [Prerequisites](#-prerequisites)
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- [Installation Guide](#-installation-guide)
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- [Step 1: Update Packages](#1-update-packages)
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- [Step 2: Install Dependencies](#2-install-dependencies)
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- [Step 3: Add Docker Repository](#3-add-docker-repository)
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- [Step 4: Install Docker Engine](#4-install-docker-engine)
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- [Post-Installation Configuration](#-post-installation-configuration)
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- [Verification](#-verification)
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---
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## 🛠 Prerequisites
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Before you begin, ensure you have:
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* One **Ubuntu 22.04** server.
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* A user with `sudo` privileges.
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* An active firewall (optional but recommended).
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---
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## 🚀 Installation Guide
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### 1. Update Packages
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First, update your existing list of packages to ensure you are getting the latest versions.
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```bash
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sudo apt update
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```
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### 2. Install Dependencies
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Install the prerequisite packages that allow apt to use packages over HTTPS.
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```Bash
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sudo apt install apt-transport-https ca-certificates curl software-properties-common
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```
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### 3. Add Docker Repository
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Add the GPG key for the official Docker repository to your system to ensure downloads are valid.
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```Bash
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curl -fsSL [https://download.docker.com/linux/ubuntu/gpg](https://download.docker.com/linux/ubuntu/gpg) | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
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```
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Add the Docker repository to your APT sources.
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```Bash
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echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] [https://download.docker.com/linux/ubuntu](https://download.docker.com/linux/ubuntu) $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
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```
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### 4. Install Docker Engine
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Update the package database again with the Docker packages from the newly added repo.
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```Bash
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sudo apt update
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```
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Finally, install Docker.
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```
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sudo apt install docker-ce
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```
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### ⚙ Post-Installation Configuration
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Run Docker Without Sudo (Optional)
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By default, the docker command can only be run by the root user or by a user in the docker group. To avoid typing sudo for every command, add your current user to the docker group.
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Add your user to the docker group:
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```Bash
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sudo usermod -aG docker ${USER}
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```
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Apply the new group membership (requires logging out or running the following):
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```Bash
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su - ${USER}
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```
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Verify that your user is added to the group:
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```Bash
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groups
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```
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Output should look like: sammy sudo docker
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### ✅ Verification
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Check that Docker is running correctly.
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```Bash
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sudo systemctl status docker
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```
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To verify that you can pull images from Docker Hub, run the "Hello World" container:
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```bash
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docker run hello-world
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```
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If successful, you will see a message indicating that your installation appears to be working correctly.
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### 📚 Resources
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Official Docker Documentation
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DigitalOcean Docker Tutorial |