### Docker Installation

> Here, we take the Linux system (Ubuntu 20.04 distribution) as an example.
> If you are not using Linux, please refer to the Windows/MacOS installation process.

According to the official Docker website, we can know there are different installation methods.

We install docker in the recommended way>

### Install using the repository
1. Use `apt` package manager to install packages to allow apt to use repositories via HTTPS

sudo apt-get update

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

2. Add Docker’s official GPG key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

3. Set up the stable repository

# for AMD64/x86_64 architecture

root@shell:$ echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

4. Install Docker Engine

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

OK, if you have completed all the above steps, you can start using Docker

Let's test if docker is installed correctly

sudo docker run hello-world


great! it works.

By the way, you can refer to the image you have.

sudo docker images


"hello-world" repository is pulled remotely by the command "docker run hello-world"

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@ docker for devops series - 0

###### tags: `CY`