# Docker # Docker Setup Guide on Ubuntu Server This guide will help you set up Docker on your Ubuntu Server for the first time. We'll cover installing Docker, running your first container, and basic usage. ## Prerequisites - **Ubuntu Server**: Ubuntu 18.04 LTS or newer is recommended. - **User Privileges**: A user account with `sudo` privileges. --- ## Step 1: Update Your System Begin by updating your package list and upgrading existing packages:
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`sudo apt updatesudo apt upgrade -y`
--- ## Step 2: Install Required Packages Install packages that allow `apt` to use repositories over HTTPS:
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`sudo apt install -y ca-certificates curl gnupg`
--- ## Step 3: Add Docker’s Official GPG Key Create a directory for the keyrings:
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`sudo install -m 0755 -d /etc/apt/keyrings`
Add Docker's official GPG key:
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`curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \ sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg`
Set appropriate permissions:
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`sudo chmod a+r /etc/apt/keyrings/docker.gpg`
--- ## Step 4: Set Up the Docker Repository Add the Docker APT repository to your system:
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`echo \ "deb [arch=$(dpkg --print-architecture) \ signed-by=/etc/apt/keyrings/docker.gpg] \ https://download.docker.com/linux/ubuntu \ $(lsb_release -cs) stable" | \ sudo tee /etc/apt/sources.list.d/docker.list > /dev/null`
--- ## Step 5: Install Docker Engine Update the package database:
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`sudo apt update`
Install Docker Engine and related components:
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`sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin`
--- ## Step 6: Verify Docker Installation Run the hello-world image to verify that Docker is installed correctly:
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`sudo docker run hello-world`
You should see a message that says "Hello from Docker!" --- ## Step 7: Manage Docker as a Non-Root User (Optional) To run Docker commands without `sudo`, add your user to the `docker` group:
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`sudo usermod -aG docker $USER`
Log out and log back in to apply the group membership. Test Docker without `sudo`:
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`docker run hello-world`
--- ## Step 8: Enable Docker to Start on Boot Ensure Docker starts automatically when the system boots:
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`sudo systemctl enable docker.servicesudo systemctl enable containerd.service`
--- ## Step 9: Basic Docker Commands ### List Docker Images
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`docker images`
### List Running Containers
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`docker ps`
### List All Containers (Including Stopped Ones)
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`docker ps -a`
### Pull an Image from Docker Hub
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`docker pull ubuntu:latest`
### Run a Container
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`docker run -it ubuntu:latest /bin/bash`
This command runs an Ubuntu container and provides an interactive shell. ### Stop a Running Container First, find the container ID using `docker ps`, then stop it:
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`docker stop `
--- ## Conclusion You've successfully installed Docker on your Ubuntu Server and run your first container. You can now explore Docker's features further by creating your own images, managing containers, and integrating Docker into your workflows. --- ## References - Docker Documentation: Install Docker Engine on Ubuntu - Docker Hub