Compiled By Charles McDowell
Comptia Certified Linux Networking Professional.
Cisco Certified Networking Technician.
“Docker allows you to package an application with all of its dependencies into a standardized unit for software development.”
What is Docker?
Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package. By doing so, thanks to the container, the developer can rest assured that the application will run on any other Linux machine regardless of any customized settings that machine might have that could differ from the machine used for writing and testing the code.
a way, Docker is a bit like a virtual machine. But unlike a virtual machine, rather than creating a whole virtual operating system, Docker allows applications to use the same Linux kernel as the system that they're running on and only requires applications be shipped with things not already running on the host computer. This gives a significant performance boost and reduces the size of the application.
And importantly, Docker is open source. This means that anyone can contribute to Docker and extend it to meet their own needs if they need additional features that aren't available out of the box.
Source: “ https://opensource.com/resources/what-docker”
What is a container?
A Docker container is an open source software development platform. Its main benefit is to package applications in containers, allowing them to be portable to any system running a Linux or Windows operating system (OS). ... While it is a major player in the container field, Docker is only one form ofcontainer technology.
Source: “ https://www.sdxcentral.com/containers/definitions/what-is-docker-container/”
What is a Docker Image?
A Docker image is a file, comprised of multiple layers, used to execute code in a Docker container. An image is essentially built from the instructions for a complete and executable version of an application, which relies on the host OS kernel. When the Docker user runs an image, it becomes one or multiple instances of that container.
Source: “ https://searchitoperations.techtarget.com/definition/Docker-image”
What is a Docker file?
A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command-line instructions in succession.
Source: “ https://docs.docker.com/engine/reference/builder/”
What is a Docker Volume?
Volumes are the preferred mechanism for persisting data generated by and used by Docker containers.
Source: “ https://docs.docker.com/storage/volumes/ “
How to Install Docker on Windows?
Install Docker Desktop for Windows desktop app
Double-click Docker Desktop Installer.exe to run the installer.
If you haven’t already downloaded the installer (Docker Desktop Installer.exe), you can get it from Docker Hub. It typically downloads to your Downloads folder, or you can run it from the recent downloads bar at the bottom of your web browser.
Follow the install wizard to accept the license, authorize the installer, and proceed with the install.
You are asked to authorize Docker.app with your system password during the install process. Privileged access is needed to install networking components, links to the Docker apps, and manage the Hyper-V VMs.
Click Finish on the setup complete dialog to launch Docker.
Start Docker Desktop for Windows
Docker does not start automatically after installation. To start it, search for Docker, select Docker Desktop for Windows in the search results, and click it (or hit Enter).
When the whale in the status bar stays steady, Docker is up-and-running, and accessible from any terminal window.
If the whale is hidden in the Notifications area, click the up arrow on the task-bar to show it. To learn more, see Docker Settings.
If you just installed the app, you also get a popup success message with suggested next steps, and a link to this documentation.
When initialization is complete, select About Docker from the Notifications area icon to verify that you have the latest version.
Congratulations! You are up and running with Docker Desktop for Windows.
Source = “https://docs.docker.com/docker-for-windows/install/”
How to install Docker on Mac?
Install and run Docker Desktop for Mac
Double-click Docker.dmg to open the installer, then drag Moby the whale to the Applications folder.
Double-click Docker.app in the Applications folder to start Docker. (In the example below, the Applications folder is in “grid” view mode.)
You are prompted to authorize Docker.app with your system password after you launch it. Privileged access is needed to install networking components and links to the Docker apps.
The whale in the top status bar indicates that Docker is running, and accessible from a terminal.
If you just installed the app, you also get a success message with suggested next steps and a link to this documentation. Click the whale () in the status bar to dismiss this popup.
Click the whale () to get Preferences and other options.
Select About Docker to verify that you have the latest version.
Congratulations! You are up and running with Docker Desktop for Mac.
Source: “https://docs.docker.com/docker-for-mac/install/”
How to Network Containers in Docker?
Docker includes support for networking containers through the use of network drivers. By default, Docker provides two network drivers for you, the bridge and the overlay drivers. You can also write a network driver plugin so that you can create your own drivers but that is an advanced task.
Every installation of the Docker Engine automatically includes three default networks.
Source: “ https://docs.docker.com/engine/tutorials/networkingcontainers/ “