nexus/raw/Home Office/如何在Ubuntu Server安装 docker & docker compose.md

title, source, author, published, created, description, tags

title	source	author	published	created	description	tags
		shenwei				docker ubuntu

#docker #ubuntu

Installing Docker and Docker Compose on Ubuntu involves a few straightforward steps. It's generally best to install from Docker's official repositories to ensure you have the latest version.

---

🐋 Step 1: Uninstall Old Versions (If Applicable)

First, remove any existing, potentially conflicting Docker packages:

Bash

for pkg in docker.io docker-engine docker-ce docker.io docker-compose docker-compose-v2; do sudo apt-get remove $pkg; done

---

🛠️ Step 2: Set Up Docker's Repository

You need to set up the repository to allow apt to use a repository over HTTPS:

1. Update the apt package index:

   Bash

   sudo apt-get update
   

2. Install necessary packages:

   Bash

   sudo apt-get install ca-certificates curl
   

3. Add Docker's official GPG key:

   Bash

   sudo install -m 0755 -d /etc/apt/keyrings
   sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
   sudo chmod a+r /etc/apt/keyrings/docker.asc
   

4. Add the repository to apt sources:

   Bash

   echo \
     "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
     $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
   

---

🚀 Step 3: Install Docker Engine

Now that the repository is set up, you can install the Docker Engine packages:

1. Update the apt package index again:

   Bash

   sudo apt-get update
   

2. Install the Docker packages:

   Bash

   sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
   

   (Note: The docker-compose-plugin installs Docker Compose V2, which is used via the command docker compose instead of docker-compose).

---

✅ Step 4: Verify the Installation

Check that the Docker Engine is running and that the installation was successful by running the test image:

Bash

sudo docker run hello-world

If successful, this command downloads a test image and runs it, printing an informational message before exiting.

---

👤 Step 5: Manage Docker as a Non-Root User (Recommended)

By default, running Docker commands requires sudo. To run Docker without sudo, you can add your user to the docker group:

1. Add your user to the docker group:

   Bash

   sudo usermod -aG docker $USER
   

2. Log out and log back in (or restart your terminal session, or run newgrp docker) for the changes to take effect.

3. Verify without sudo:

   Bash

   docker run hello-world
   

You should now have Docker Engine and Docker Compose (V2) installed and ready to use!

Would you like to know some basic Docker commands or learn how to write a simple docker-compose.yml file?