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| # Installing the Docker Engine on Ubuntu | ||
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| Further details can be found under: `https://docs.docker.com/engine/install/ubuntu/#set-up-the-repository` | ||
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| ## Install using the repository | ||
| Before you install Docker Engine for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository. | ||
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| 1. Set up the repository: Update the apt package index and install packages to allow apt to use a repository over HTTPS: | ||
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| ```bash | ||
| sudo apt-get update | ||
| sudo apt-get install ca-certificates curl gnupg lsb-release | ||
| ``` | ||
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| 2. Add Docker’s official GPG key: | ||
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| ```bash | ||
| sudo mkdir -p /etc/apt/keyrings | ||
| curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg | ||
| ``` | ||
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| 3. Use the following command to set up the repository: | ||
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| ```bash | ||
| echo \ | ||
| "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \ | ||
| $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null | ||
| ``` | ||
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| 4. Install Docker Engine | ||
| Update the apt package index: | ||
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| ```bash | ||
| sudo apt-get update | ||
| ``` | ||
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| 5. Install latest Docker Engine, containerd, and Docker Compose: | ||
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| ```bash | ||
| sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin | ||
| ``` | ||
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| **Docker Compose** is a tool for defining and running multi-container Docker applications. A series of `*.yaml` files | ||
| are used configure the required services for the application. This means all container services can be brought up in a | ||
| single command. | ||
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| You can check your current **Docker** and **Docker Compose** versions using the following commands: | ||
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| ```bash | ||
| docker version | ||
| docker compose version | ||
| ``` | ||
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| Please ensure that you are using Docker version 20.10 or higher and Docker Compose 1.29 or higher and upgrade if | ||
| necessary. | ||
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| > **Important** In recent versions, `docker-compose` is already included as part of of the main `docker` client, Please | ||
| > ensure that you are using Docker version 24.0.4 or higher and Docker Compose 2.29.1 or higher and upgrade if necessary. | ||
| > If you are unable to upgrade and stuck using an older version you can still run the tutorials by adding a `legacy` | ||
| > parameter at the end the `./services` script commands e.g. `services start legacy` | ||
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| If using a Linux distro with an outdated `docker-compose`, the files can be installed directly as shown: | ||
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| ```bash | ||
| sudo curl -L "https://github.com/docker/compose/releases/download/1.24.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose | ||
| sudo chmod +x /usr/local/bin/docker-compose | ||
| ``` | ||
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| If you are using docker-compose in Ubuntu with VMWare and faced the following error: _ERROR: Couldn't connect to Docker | ||
| daemon at http+docker://localunixsocket - is it running?_ | ||
| It can be solved by owning the `/var/run/docker.sock` Unix socket as shown: | ||
| ```bash | ||
| sudo chown $USER /var/run/docker.sock | ||
| ``` |
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| # Virtual Box Setup | ||
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| Windows and Mac are able to emulate a Unix system when running [VirtualBox](https://www.virtualbox.org/) - the following minimal set-up is recommended: | ||
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| - VirtualBox | ||
| - Ubuntu 22.04.2 2G RAM 25G Disk | ||
| - Docker Engine on Ubuntu: Docker 24.0.4 and Docker compose 2.19.1 | ||
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| Download Virtualbox from [here](https://www.virtualbox.org/) | ||
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| ## Ubuntu | ||
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| Download Ubuntu LTS from [here](https://ubuntu.com/download/desktop) | ||
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| To set up the working environment, follow these steps: | ||
| - Open Virtualbox and create a new virtual machine. | ||
| - Select the ISO image downloaded earlier (.iso file). | ||
| - Choose a username and a password. Check the "Guest Additions" option (to enable features such as shared clipboard and shared folders). | ||
| - Set the memory size to 2GB and allocate 2 CPUs. | ||
| - Create a virtual hard disk with a size of 25GB. | ||
| - Finish the setup process and start the virtual machine. | ||
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| If you encounter the error _"Username is not in the sudoers file. This incident will be reported"_ when attempting to execute a `sudo` command, follow these steps to resolve the issue: | ||
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| - Restart your virtual machine. While restaring, press the Shift key for a few seconds to get the Grub boot menu. | ||
| - Using the Down Arrow, select "Advanced options for Ubuntu" and press Enter. | ||
| - Select the kernel with the "recovery mode" option and press Enter to open the Recovery menu. | ||
| - In the "Recovery menu", move over to the line "root Drop to root shell prompt", then press Enter. | ||
| - Use the root password and press Enter to start the "maintenance mode". | ||
| - At this point, you should be at the root shell prompt. Change the system to be mounted as read/write by running the command: "mount -o rw,remount /" | ||
| - Execute the following command to add the user to the sudo group: "adduser username sudo" (use the actual username on the system). | ||
| - Type the exit command to go back to the "Recovery menu": "Exit" | ||
| - Use the Right Arrow to select `<Ok>` and press Enter. | ||
| - Press `<Ok>` to continue with normal boot sequence. |
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