Master everything you need to know about Docker containers to easily create, deploy, and run your applications with containers.

DevOps for Developers

By now, you've probably heard the buzz around Docker. It's fundamentally changed the development process and been adopted by software teams of all sizes, and for good reason: Docker makes it considerably easier to create, deploy, and run applications with the use of containers.

Docker is here to stay, and is becoming one of the most in-demand technologies on the market. Mastering it now will help you produce better software, level up your career, and stand out from the crowd. Get started today.

Docker for Developers

*docker build* command **&** *FROM* instruction

*docker build* command **&** *Dockerfile* file

*Dockerfile* file **&** *FROM* instruction

What are the two main components required to create a Docker image?

What are the two main components required to create a Docker image?

Which instruction does a Dockerfile begin with?

Which instruction does a Dockerfile begin with?

Specifies from which registry the image is being created

Specifies which base image the current image is based on

Specifies from which image a container will be built

What is the purpose of a the *FROM* instruction in a Dockerfile?

What is the purpose of a the FROM instruction in a Dockerfile?

Naming an image is a requirement for creating it.

Naming an image is a requirement for creating it.

Which is the correct command to be used when creating an image from a *Dockerfile*?

Which is the correct command to be used when creating an image from a Dockerfile?

Which instruction can be used to insert additional files inside a *Dockerfile*?

Which instruction can be used to insert additional files inside a Dockerfile?

We have a Dockerfile that has `From: ubuntu:latest`. We build an image using this Dockerfile on November 3, 2021. We launch a container using the resulting image on February 23, 2022. Which base image for ubuntu will be used?

We have a Dockerfile that has <code>From: ubuntu:latest</code>. We build an image using this Dockerfile on November 3, 2021. We launch a container using the resulting image on February 23, 2022. Which base image for ubuntu will be used?

First Parameter: Destination directory inside the image **&** Second Parameter: File to be copied from the build context

First Parameter: File to be copied from the build context **&** Second Parameter: Destination directory on disk

First Parameter: Directory from which file is to be copied **&** Second Parameter: Destination directory inside the image

First Parameter: File to be copied from the build context **&** Second Parameter: Destination directory inside the image

The *COPY* instruction has two parameters. What are they?

The COPY instruction has two parameters. What are they?

Which switch allows you to stop a container using *ctrl-c* from the command line?

Which switch allows you to stop a container using ctrl-c from the command line?

Gives a list of containers built using the specified image

Deletes all images locally available on your computer

Gives a list of images locally available on your computer

What does the following command do?

```
docker image ls
```

What does the following command do?
<pre><code>docker image ls
</code></pre>

Which instruction is used to define a default value for an environment variable in a *Dockerfile*?

Which instruction is used to define a default value for an environment variable in a Dockerfile?

Which instruction lets you store data in a persistent file system?

Which instruction lets you store data in a persistent file system?

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Now that we know how to create our own images, in the next chapter we will learn how to publish them.

In the following quiz, you will be tested on concepts you learned in this chapter.



Quiz