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Docker in 100 Seconds

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1.Understand Docker and Containers

0:00 / 0:46

This chapter introduces Docker as a tool for packaging software into containers. It explains the problem Docker solves, which is replicating software environments reliably across different systems. It then contrasts containers with virtual machines, highlighting that containers virtualize the OS rather than hardware, making them faster and more efficient.

  • Docker
  • Container
  • Virtual Machine (VM)
  • Operating System (OS)
  • Kernel

What's inside this course

  1. 0:00

    1. Understand Docker and Containers

    This chapter introduces Docker as a tool for packaging software into containers. It explains the problem Docker solves, which is replicating software environments reliably across different systems. It then contrasts containers with virtual machines, highlighting that containers virtualize the OS rather than hardware, making them faster and more efficient.

  2. 0:46

    2. Explore Docker Elements: Dockerfile, Image, Container

    This chapter delves into the three fundamental elements of Docker: the Dockerfile, the image, and the container. It explains that a Dockerfile is code that instructs Docker on how to build an image. An image is a snapshot of software and its dependencies, which is immutable. A container is the actual running instance of the software based on an image.

  3. 1:49

    3. Build and Run Docker Images and Containers

    This chapter provides a practical overview of how to create a Dockerfile using commands like 'FROM' and 'RUN' to define the image's environment and dependencies. It then demonstrates how to build an image from the Dockerfile using 'docker build' and how to run a container from that image using 'docker run'. The chapter concludes by highlighting the scalability and reliability benefits of Docker.

Every chapter ends with a checkpoint (quiz, flashcards, retell, diagram, or prediction) and the course closes with a final boss-fight. More courses →

Transcript (72 segments)
0:00docker a tool that can package software
0:02into containers that run reliably in any
0:05environment but what is a container and
0:07why do you need one let's imagine you
0:08built an app with cobalt that runs on
0:09some weird flavor of linux you want to
0:11share this app with your friend but he
0:12has an entirely different system so the
0:14problem becomes how do we replicate the
0:16environment our software needs on any
0:18machine one way to package an app is
0:19with a virtual machine where the
0:20hardware is simulated then installed
0:22with the required os and dependencies
0:24this allows us to run multiple apps on
0:26the same infrastructure however because
0:28each vm
0:29is running its own operating system they
0:30tend to be bulky and slow
0:32now a docker container is conceptually
0:34very similar to a vm
0:35with one key difference instead of
0:37virtualizing hardware containers only
0:39virtualize the os
0:40or in other words all apps or containers
0:43are run by a single kernel
0:44and this makes almost everything faster
0:46and more efficient there are three
0:47fundamental elements in the universe of
0:49docker
0:50the docker file the image and the
0:52container the docker file is like dna
0:54it's just code that tells docker how to
0:57build an image which itself is a
0:59snapshot of your software
1:00along with all of its dependencies down
1:02to the operating system level the image
1:04is immutable and it can be used to spin
1:06up multiple containers which is your
1:07actual software running in the real
1:09world
1:09create a docker file and use from to
1:11start from an existing template like
1:13ubuntu this base image gets pulled down
1:15from the cloud
1:16and you can also upload your own images
1:18to a variety of different docker
1:19registries
1:20from there you might want to use run to
1:21run a terminal command that installs
1:23dependencies into your image
1:24you can set environment variables and do
1:26all kinds of other stuff then the last
1:28thing you'll do is set a default command
1:29that's executed when you start up a
1:31container
1:31and now we can create the image file by
1:33running the docker build command
1:35it goes through each step in our docker
1:36file to build the image layer by layer
1:39we can then bring this image to life as
1:40a container with the docker run command
1:43as your app demands more resources you
1:44can run it on multiple machines multiple
1:46clouds on-prem
1:48or wherever you want reliably this has
1:50been docker in 100 seconds
1:51if you enjoyed it make sure to like and
1:53subscribe and stay tuned for more docker
1:55content coming to this channel soon
1:57thanks for watching and i will see you
1:58in the next one