From 2dfe09c189b4bcf9b192ed872d7b151d08775417 Mon Sep 17 00:00:00 2001 From: DarkSun Date: Wed, 6 Dec 2023 05:03:28 +0800 Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98[tech]:=2020231204=20How=20to?= =?UTF-8?q?=20Install=20Docker=20on=20Ubuntu?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit sources/tech/20231204 How to Install Docker on Ubuntu.md --- ...0231204 How to Install Docker on Ubuntu.md | 260 ++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 sources/tech/20231204 How to Install Docker on Ubuntu.md diff --git a/sources/tech/20231204 How to Install Docker on Ubuntu.md b/sources/tech/20231204 How to Install Docker on Ubuntu.md new file mode 100644 index 0000000000..5fca2fc745 --- /dev/null +++ b/sources/tech/20231204 How to Install Docker on Ubuntu.md @@ -0,0 +1,260 @@ +[#]: subject: "How to Install Docker on Ubuntu" +[#]: via: "https://itsfoss.com/install-docker-ubuntu/" +[#]: author: "Sagar Sharma https://itsfoss.com/author/sagar/" +[#]: collector: "lujun9972/lctt-scripts-1700446145" +[#]: translator: " " +[#]: reviewer: " " +[#]: publisher: " " +[#]: url: " " + +How to Install Docker on Ubuntu +====== + +Using Docker means opening a new realm of computing but if you are just getting started with Docker, the installation may seem a huge task. + +There are two recommended ways of installing Docker on Ubuntu: + + * **Installing Docker from Ubuntu's repository** : Easy, single line command but gives a little old version + * **Using Docker's official repository:** Slightly more work but gives the most recent stable release + + + +And I will be discussing both of them in this tutorial. + +### Method 1: Install Docker using Ubuntu's repository + +If you don't care about having a little older version and don't want to get into setting and managing repositories, then this is the best method for you. + +Start with updating the repository index: + +``` + + sudo apt update + +``` + +Now, you can use the following command to install Docker as well as [Docker Compose][1] in Ubuntu: + +``` + + sudo apt install docker.io docker-compose + +``` + +📋 + +The Docker package is named docker.io because there existed a transitional package named docker (for docklet applications) even before Docker came into existence. For this reason, the Docker package had to be named something else. + +Once you are done with the installation, you can check the installed version using the following command: + +``` + + docker -v + +``` + +![][2] + +As you can see, it gave me Docker version 24.0.5. + +### Method 2: Install the latest stable version of Docker in Ubuntu + +If you want the most recent stable version of Docker, then you can install Docker from their official repository. + +#### Step 1: Remove any existing Docker packages + +But before you jump to the installation part, it is necessary to remove any old installation of Docker. + +To [uninstall the old Docker installation][3], use the following command. + +``` + + sudo apt remove docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc + +``` + +#### Step 2: Install dependencies + +The first step is to install some essential packages which will be used to install Docker later in this tutorial: + +``` + + sudo apt install ca-certificates curl gnupg lsb-release + +``` + +You may already have some or all of these packages installed but no harm in ensuring that. The above command won't harm you. + +#### Step 3: Add GPG key of Docker repository and add it to sources.list + +Now, create a directory with special permissions suitable for storing cryptographic keyrings by the apt package manager for package verification: + +``` + + sudo install -m 0755 -d /etc/apt/keyrings + +``` + +Next, [use the curl command][4] as shown below to download and import GPG keyring for Docker: + +``` + + curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg + +``` + +After downloading the GPG keyring, [change the file permissions using the chmod command][5] so every user on the system can read the GPG keyring: + +``` + + sudo chmod a+r /etc/apt/keyrings/docker.gpg + +``` + +Finally, add the Docker repository to the `sources.list.d` file: + +``` + + echo \ + "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \ + $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \ + sudo tee /etc/apt/sources.list.d/docker.list > /dev/null + +``` + +That's it! + +#### Step 4: Installing Docker and Docker Compose + +Now, to take effect from the changes you've made to the system, update the system repository: + +``` + + sudo apt update + +``` + +Grab the latest version of Docker along with other Docker components and dependencies using the following command: + +``` + + sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin + +``` + +📋 + +While the docker.io package installs most of the necessary Docker components, you'll need to do it individually here. + +To check the installed version, use the following command: + +``` + + docker -v + +``` + +![][6] + +Another great way to test the installation is to use the Hello World image in Docker. + +Lemme show you how to do it. + +### Use a hello-world image to verify the Docker installation + +Running a Hello World program is a standard practice that we all follow to kick-start any programming journey and the same goes for Docker. + +Docker provides you with a Hello World image that you can use to test the installation. + +To install and run the Hello World image, simply use the following: + +``` + + sudo docker run hello-world + +``` + +![][7] + +Some users may get an error while executing the above command saying "Cannot connect to the Docker daemon": + +![][8] + +In that case, **reboot your system** and try again to install the Docker Hello World image and it'll work just fine. + +### 💡Bonus Tip: Use docker without sudo in Ubuntu + +If you noticed, I used sudo to pull the docker image which is not the most convenient way to use the Docker. + +If you try to use Docker without sudo, it will give you an error: + +![][9] + +Well, in this section, I will show you how you can use Docker without sudo. + +📋 + +To perform the shown steps, superuser privileges are a must! + +The first step is to [create a new group][10] named `Docker` using the following: + +``` + + sudo groupadd docker + +``` + +Once done, add the user to the Docker group using the following: + +``` + + sudo usermod -aG docker + +``` + +🚧 + +Make sure you only mention the user who has super-user privileges. + +Now, log out and log back in to take effect from the changes. But if you are using a VM then reboot is a must. + +That's it! From now on, you can use the docker commands without sudo like I did to run the Docker Hello World image: + +![][11] + +There you go. + +### Here's what to do after installing Docker + +If you are just getting started, then refer to the [list of essential Docker commands][12] that every user must know: + +![][13] + +I hope you will find this helpful. + +-------------------------------------------------------------------------------- + +via: https://itsfoss.com/install-docker-ubuntu/ + +作者：[Sagar Sharma][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://itsfoss.com/author/sagar/ +[b]: https://github.com/lujun9972 +[1]: https://linuxhandbook.com/docker-compose-quick-start/ +[2]: https://itsfoss.com/content/images/2023/12/Check-the-installed-version-of-docker-in-Ubuntu.png +[3]: https://learnubuntu.com/uninstall-docker/ +[4]: https://learnubuntu.com/install-curl/ +[5]: https://learnubuntu.com/chmod-command/ +[6]: https://itsfoss.com/content/images/2023/12/Install-the-latest-version-of-Docker-in-Ubuntu-using-Docker-s-official-repository.png +[7]: https://itsfoss.com/content/images/2023/12/Run-hello-world-docker-image-in-Ubuntu.png +[8]: https://itsfoss.com/content/images/2023/12/Docker-error.png +[9]: https://itsfoss.com/content/images/2023/12/Docker-sudo-error-in-Ubuntu.png +[10]: https://learnubuntu.com/add-group/ +[11]: https://itsfoss.com/content/images/2023/12/Use-docker-without-sudo-in-Ubuntu.png +[12]: https://linuxhandbook.com/essential-docker-commands/ +[13]: https://linuxhandbook.com/content/images/size/w256h256/2021/08/Linux-Handbook-New-Logo.png