- Docker Tutorial
- Docker Useful Resources
- Selected Reading
- Install Compose on Linux systems. On Linux, you can download the Docker Compose binary from the Compose repository release page on GitHub. Follow the instructions from the link, which involve running the curl command in your terminal to download the binaries. These step-by-step instructions are also included below.
- Running OpenJDK in Alpine Linux in a Docker container is more easy than you might think. You don’t require any specific accounts for this and also no login. When you pull openjdk:8, you will get a Debian 9 image. In order to run on Alpine Linux, you can do. Docker pull openjdk:8-jdk-alpine. Next you can do.
Index of linux/./ centos/ debian/ fedora/ raspbian/ rhel/ static/ ubuntu/ centos/ debian/ fedora/ raspbian/ rhel/ static/ ubuntu/.
To start the installation of Docker, we are going to use an Ubuntu instance. You can use Oracle Virtual Box to setup a virtual Linux instance, in case you don’t have it already.
The following screenshot shows a simple Ubuntu server which has been installed on Oracle Virtual Box. There is an OS user named demo which has been defined on the system having entire root access to the sever.
To install Docker, we need to follow the steps given below.
Step 1 − Before installing Docker, you first have to ensure that you have the right Linux kernel version running. Docker is only designed to run on Linux kernel version 3.8 and higher. We can do this by running the following command.
Linux Download Docker-compose
uname
This method returns the system information about the Linux system.
Syntax
Options
a − This is used to ensure that the system information is returned.
Return Value
This method returns the following information on the Linux system −
- kernel name
- node name
- kernel release
- kernel version
- machine
- processor
- hardware platform
- operating system
Example
Output
When we run above command, we will get the following result −
From the output, we can see that the Linux kernel version is 4.2.0-27 which is higher than version 3.8, so we are good to go.
Step 2 − You need to update the OS with the latest packages, which can be done via the following command −
This method installs packages from the Internet on to the Linux system.
Syntax
sudo apt-get update
Options
sudo − The sudo command is used to ensure that the command runs with root access.
update − The update option is used ensure that all packages are updated on the Linux system.
Return Value
None
Example
Output
When we run the above command, we will get the following result −
This command will connect to the internet and download the latest system packages for Ubuntu.
Step 3 − The next step is to install the necessary certificates that will be required to work with the Docker site later on to download the necessary Docker packages. It can be done with the following command.
Step 4 − The next step is to add the new GPG key. This key is required to ensure that all data is encrypted when downloading the necessary packages for Docker.
The following command will download the key with the ID 58118E89F3A912897C070ADBF76221572C52609D from the keyserver hkp://ha.pool.sks-keyservers.net:80 and adds it to the adv keychain. Please note that this particular key is required to download the necessary Docker packages.
Step 5 − Next, depending on the version of Ubuntu you have, you will need to add the relevant site to the docker.list for the apt package manager, so that it will be able to detect the Docker packages from the Docker site and download them accordingly.
Precise 12.04 (LTS) ─ deb https://apt.dockerproject.org/repoubuntu-precise main
Trusty 14.04 (LTS) ─ deb https://apt.dockerproject.org/repo/ ubuntu-trusty main
Wily 15.10 ─ deb https://apt.dockerproject.org/repo ubuntu-wily main
Xenial 16.04 (LTS) - https://apt.dockerproject.org/repo ubuntu-xenial main
Since our OS is Ubuntu 14.04, we will use the Repository name as “deb https://apt.dockerproject.org/repoubuntu-trusty main”.
And then, we will need to add this repository to the docker.list as mentioned above.
Step 6 − Next, we issue the apt-get update command to update the packages on the Ubuntu system.
Step 7 − If you want to verify that the package manager is pointing to the right repository, you can do it by issuing the apt-cache command.
In the output, you will get the link to https://apt.dockerproject.org/repo/
Linux Download Docker Image
Step 8 − Issue the apt-get update command to ensure all the packages on the local system are up to date.
Step 9 − For Ubuntu Trusty, Wily, and Xenial, we have to install the linux-image-extra-* kernel packages, which allows one to use the aufs storage driver. This driver is used by the newer versions of Docker.
It can be done by using the following command.
Step 10 − The final step is to install Docker and we can do this with the following command −
Here, apt-get uses the install option to download the Docker-engine image from the Docker website and get Docker installed.
The Docker-engine is the official package from the Docker Corporation for Ubuntu-based systems.
In the next section, we will see how to check for the version of Docker that was installed.
Docker Version
To see the version of Docker running, you can issue the following command −
Syntax
Options
version − It is used to ensure the Docker command returns the Docker version installed.
Return Value
The output will provide the various details of the Docker version installed on the system.
Example
Output
When we run the above program, we will get the following result −
Docker Info
To see more information on the Docker running on the system, you can issue the following command −
Syntax
Options
info − It is used to ensure that the Docker command returns the detailed information on the Docker service installed.
Return Value
The output will provide the various details of the Docker installed on the system such as −
- Number of containers
- Number of images
- The storage driver used by Docker
- The root directory used by Docker
- The execution driver used by Docker
Example
Output
When we run the above command, we will get the following result −
Docker for Windows
Docker has out-of-the-box support for Windows, but you need to have the following configuration in order to install Docker for Windows.
System Requirements
| Windows OS | Windows 10 64 bit |
| Memory | 2 GB RAM (recommended) |
You can download Docker for Windows from − https://docs.docker.com/docker-for-windows/
Docker ToolBox
Docker ToolBox has been designed for older versions of Windows, such as Windows 8.1 and Windows 7. You need to have the following configuration in order to install Docker for Windows.
System Requirements
| Windows OS | Windows 7 , 8, 8.1 |
| Memory | 2 GB RAM (recommended) |
| Virtualization | This should be enabled. |
You can download Docker ToolBox from − https://www.docker.com/products/docker-toolbox
March 2, 2020 by Matt Hernandez, @fiveisprime
Last June, the Docker team announced that they will be investing in getting Docker running with the Windows Subsystem for Linux (WSL). All of this is made possible with the recent changes to the architecture of WSL to run within a lightweight virtual machine (VM), which we talked about in an earlier blog post about WSL 2. Since this announcement, the Docker team has released a Technical Preview of Docker that includes support for running with WSL 2.
This article explains how the Docker Desktop technical preview works as well as how to use the Docker extension with the technical preview.
How it works
This new Docker architecture works a lot like Visual Studio Code's WSL remote development support in that the Docker CLI running on the host machine executes commands within the Docker Integration Package, which runs on the remote WSL VM.
Image credit: Docker Engineering
DockerD runs directly within WSL so there's no need for the Hyper-V VM and all Linux containers run within the Linux userspace on Windows for improved performance and compatibility.
Getting set up
First some prerequisites:
- Install Windows 10 Insider Preview build 18975 (Slow) or later for WSL 2.
- Install Ubuntu from the Microsoft store.
- Enable WSL 2 by following this guide.
- Install the Remote - WSL extension for VS Code.
- Install the Docker WSL 2 Technical Preview.
Once installed, Docker will recognize that you have WSL installed and prompt to enable WSL integration. You want to Enable WSL integration for this tutorial.
This option will allow you to access Docker Desktop via the Docker CLI directly from within your Linux distro.
If you have multiple Linux distros, make sure you only have WSL integration turned on for the correct one in your Docker settings:
With that configured, all commands will execute in the Linux context - this includes Docker commands run from PowerShell so running something like docker run mongo… will start a Linux container within the WSL VM.
Running the docker ps command over in WSL, you'll see the container as expected. Notice that the container ID matches.
Using VS Code
With this set up and running, you can install the VS Code Docker extension and access your containers. If you're already running WSL 2 and the Remote - WSL extension, this will help you get Docker integrated into your WSL workflow rather than switching contexts when you need containers. And because the Docker CLI's context is set to use DockerD in WSL, the extension will work with your containers regardless of whether you opened VS Code using the Remote - WSL extension.
Download Docker Linux Centos
Notice how in the screenshot below, I'm connected and working in WSL and still building/running containers without changing from my preferred environment (zsh in Ubuntu).
Theme: Noctis Sereno
I've personally noticed a vast improvement in container execution times using this configuration and each part of my typical development workflow remains the same. I'm also using the Remote - Containers extension within WSL for testing specific environments without setting things up directly on my machine.
We want your feedback
Keep in mind that you're using prerelease software and, while the Windows Insiders Slow ring is very stable, you may run into some issues. If you do find something that isn't working as expected, please open an issue via the Feedback tool in Windows. Any direct Docker issues or feedback can be logged in the Docker for Windows repo.
Happy Coding!
Matt Hernandez, VS Code Program Manager @fiveisprime