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In this course, you’ll learn about containers, creating images, containerizing applications, and effectively deploying Docker in real-world scenarios.

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Containers have revolutionized the IT world, making it difficult to know where to begin. This course will take you from basics to proficiency step by step.
You’ll start by learning the basics of containers and how they work. Then, you’ll explore key concepts like images and the Docker engine. With the basics out of the way, you’ll learn how to containerize and run an application. After completing this course, you’ll be ready to use Docker in the real world.

Docker Guide for Beginners

**Container restart policies** are a simple form of self-healing that allows the local Docker Engine to automatically restart failed containers.

# Restart policies 
We apply restart policies per container, and Docker supports the following four policies:

- `no` (default)
- `on-failure`
- `always`
- `unless-stopped`

The following table shows how each policy reacts to different scenarios. A “Y” indicates the policy will attempt a container restart, whereas an “N” indicates it won’t.



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Non-zero exit codes indicate a failure occurred. Zero exit codes indicate the container exited normally without an error. We’ll demo some examples, but you can also test on your own.

## The `always` restart policy
Let’s demonstrate the `always` policy by starting a new interactive container with the `--restart always` flag and directing it to run a shell process. We’ll then type `exit` to terminate the shell process and the container to see what happens.

Run the following command to start an interactive container called `neversaydie` with the `always` restart policy.



Learn how to use the container restart policies to ensure the smooth functioning of containers. 

About the Course

An Overview of Containers

Docker and Container-Related Standards and Projects

The Big Picture

The Docker Engine

Working with Images

Working with Containers

Containerizing an Application

Conclusion

Appendix: Getting Docker

Self-Healing Containers with Restart Policies

Restart policies