Docker doesn’t need any introduction now, it is a popular and free-to-use container solution that has established itself very well in the field of container-based applications. Here we will learn the best way to install Docker on Ubuntu Hirsute 21.04, Ubuntu Groovy 20.10, Ubuntu Focal 20.04 (LTS), and Ubuntu Bionic 18.04 (LTS).
Being a containerized software solution, Docker offers all functions needed to virtualize applications and operate the containers in an isolated environment from one another, on a host system. A container contains all the resources required to run an application, including the application code, the runtime environment, the system libraries, and the system tools. The system which manages the computer’s resources to the individual containers and ensures their isolation on the host system is called Docker Engine.
I'm trying to set docker up on a new system, and when running docker info I get: docker -v = Docker version 18.09.5, build e8ff056 docker info = Got permission denied while trying to conn.
- After adding the user to the docker group, log out and log back in to take effect the changes. Alternatively, run the following command to apply the changes to groups: $ newgrp docker. From now on, the normal (non-root) user can be able to use Docker without sudo permissions. Let me run the following commands as normal user: $ docker version.
- Jul 05, 2018 Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 18.04 ( bionic ). Finally, install Docker: sudo apt install docker-ce. Docker should now be installed, the daemon started, and the process enabled to start on boot.
- Install the Docker CE: 1. Sudo apt update. Sudo apt install -y docker-ce. By default, root and user with sudo privileges can use Docker. During installation docker group is created. So if you want to allow to use Docker for non-root users, you can add user to the docker group. Add current user to docker group.
- Feb 04, 2016 To fix this error, ether run all docker commands as root or add current user to docker group as shown below: $ sudo usermod -aG docker user1. After this logout and login again for changes to take effect. Posted in Tutorials Tagged Docker, Linux, Tutorials, Ubuntu Linux.
Few key advantages of using Docker container machines:
- Free to use Software
- It requires fewer resources than virtual machines
- Provides Security and isolates the applications from one another and from the host system
- Simple management of many containers via orchestration tools such as Kubernetes
- The availability of containers in the image file makes it easily transferrable to other systems.
- Easy to install and Quickstart
- Best method to install Docker on Ubuntu 20.04 Linux
Best method to install Docker on Ubuntu 20.04 Linux
There are three ways to install Docker on Ubuntu Linux but the best one is by using its official repository. Whereas the two others are SNAP and the base repo.
Hence, here we will show the steps to set up Docker on Ubuntu by adding its official repository which is the best possible way to get the latest stable version. Of course, we can get it via SNAP but due confinement model of Snap you may get issues in connecting to the Docker daemon. Or the system would not be able to recognize the docker daemon running on the host. On the other side, the Docker installation from Ubuntu’s base repo will be an extremely stable one, no doubt, but with no guarantee, you will get the latest one with all new features. Hence, go for the tutorial given below:
1. Add few common packages
There are few packages we require during the setup of Docker on Ubuntu such as adding its repo over HTTPS need package that supports it, curl, and lsb-release to know the version of Linux.
2. Add Docker’s GPG Key
Before adding the repository of Docker, we have to add the GPG key that will ensure the packages we will get to install Docker, are from the authentic source without any kind of alteration.
3. Best way- Add Stable Docker repository on Ubuntu 20.04 or others
Now, on your Ubuntu, paste the following block of command and hit Enter key. It will automatically detect your Ubuntu version to add the corresponding available repository.
4. Run system update
To let the system know that we have recently added a new repository, run a system update command to rebuild the system repo cache.
5. Install Docker Engine on Ubuntu
Finally, run a single command that will install and set up the Docker community version with other required tools on your Ubuntu 20.04 Linux or the one you are using.
6. Test your installation
To know everything has been installed correctly to work with containers, let’s create a simple container image called hello-world.
7. Add your User to the Docker group
By default, to create any Container or to run the Docker command you have to use sudo with it. To remove this, we need to add our current to its group.
Ubuntu Docker Group Login
That’s it, now the latest version of Docker is on your respective Ubuntu version. From here you can start exploring and creating containers by pulling from DockerHub or creating your own image.
Ubuntu Docker Add User To Group
If you are not comfortable with the command line then try out the Docker GUI, here is the article on it: Install Portainer Docker Web GUI or How to install Kitematic on Ubuntu 20.04 LTS…