Docker & Kubernetes Online Training

 

Docker Online Training - Visualpath

Welcome! We’re excited that you want to learn Docker.

This guide contains step-by-step instructions on how to get started with Docker. Some of the things you’ll learn and do in this guide are:

• Build and run an image as a container.
• Share images using Docker Hub.
• Deploy Docker applications using multiple containers with a database.
• Run applications using Docker Compose.

Before you get to the hands on part of the guide, you should learn about containers and images.

What is a container?

Simply put, a container is a sandboxed process on your machine that is isolated from all other processes on the host machine. That isolation leverages kernel namespaces and cgroups, features that have been in Linux for a long time. Docker has worked to make these capabilities approachable and easy to use. To summarize, a container:

• Is a runnable instance of an image. You can create, start, stop, move, or delete a container using the DockerAPI or CLI.
• Can be run on local machines, virtual machines or deployed to the cloud.
• Is portable (can be run on any OS).
• Is isolated from other containers and runs its own software, binaries, and configurations.

What is a container image?

When running a container, it uses an isolated filesystem. This custom filesystem is provided by a container image. Since the image contains the container’s filesystem, it must contain everything needed to run an application - all dependencies, configurations, scripts, binaries, etc.

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