Installing Docker in Ubuntu 18.04

Docker is a software for automating the deployment and management of applications in an operating system-level virtualization environment. It allows you to package an application with all its environment and dependencies into a container that can be ported to any Linux system with kernel cgroups support and provides a container management environment

Before installing Docker, update the existing Ubuntu package list: ``.shell sudo apt update

Next, let's install the necessary packages that allow **apt** to use packages over HTTPS:
``.shell
sudo apt install apt-transport-https ca-certificates curl software-properties-common

Add the GPG key of the official Docker repository to your system: ``.shell curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Add Docker repository to the list of APT package sources:
``.shell
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"

Then update the package database with information about Docker packages from the newly added repository: ``.shell sudo apt update

To make sure to install Docker from the Docker repository and not from the default Ubuntu repository, run the command:
``.shell
apt-cache policy docker-ce

``.shell root@kvmde67-19464:~# apt-cache policy docker-ce docker-ce: Installed: (none) Candidate: 5:19.03.8~3-0~ubuntu-bionic Version table: 5:19.03.8~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.7~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.6~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.5~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.4~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.3~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.2~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.1~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:19.03.0~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:18.09.9~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:18.09.8~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:18.09.7~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:18.09.6~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages 5:18.09.5~3-0~ubuntu-bionic 500 500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages

This **docker-ce** will not install, but will use the Docker repository for Ubuntu 18.04 (bionic) to install it.

Installing Docker:
``.shell
sudo apt install docker-ce

Docker is installed, the process will start at system startup.

Let's check that the process is running: ``.shell sudo systemctl status docker

``.shell
root@kvmde67-19464:~# sudo systemctl status docker
Docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2020-05-04 12:39:10 CEST; 10min ago
     Docs: https://docs.docker.com
 Main PID: 25442 (dockerd)
    Tasks: 8
   CGroup: /system.slice/docker.service
           └─25442 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.1023724
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.1029843
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.1031972
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.1039081
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.3951962
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.5422199
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.6728980
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.6741207
May 04 12:39:10 kvmde67-19464.fornex.org systemd[1]: Started Docker Application Container 
May 04 12:39:10 kvmde67-19464.fornex.org dockerd[25442]: time="2020-05-04T12:39:10.7732793

When we install Docker, we get not only the Docker service, but also the docker command line utility or the Docker client.

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You can also use our One-Click-Apps for one-click installation to install Docker To do so, select the required VPS plan and select Apps → Docker, to install.

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If you have any configuration difficulties or have additional questions, you can always contact our support team via ticket system.