تدريب Shadowing: Docker in 100 Seconds - تعلم التحدث بالإنجليزية مع YouTube
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Docker, a tool that can package software into containers that run reliably in any environment.
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Docker, a tool that can package software into containers that run reliably in any environment.
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But what is a container and why do you need one?
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Let's imagine you built an app with COBOL that runs on some weird flavor of Linux.
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You want to share this app with your friend, but he has an entirely different system.
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So the problem becomes, how do we replicate the environment our software needs on any machine?
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One way to package an app is with a virtual machine, where the hardware is simulated then installed with the required OS and dependencies.
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This allows us to run multiple apps on the same infrastructure, however, because each VM is running its own operating system, they tend to be bulky and slow.
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Now, a Docker container is conceptually very similar to a VM with one key difference.
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Instead of virtualizing hardware, containers only virtualize the OS.
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Or in other words, all apps or containers are run by a single kernel, and this makes almost everything faster and more efficient.
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There are three fundamental elements in the universe of Docker.
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The Dockerfile, the image, and the container.
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The Dockerfile is like DNA, it's just code that tells Docker how to build an image, which itself is a snapshot of your software,
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along with all of its dependencies down to the operating system level.
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The image is immutable and it can be used to spin up multiple containers, which is your actual software running in the real world.
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Create a Dockerfile and use from to start from an existing template like Ubuntu.
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This base image gets pulled down from the cloud, and you can also upload your own images to a variety of different Docker registries.
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From there, you might want to use run to run a terminal command that installs dependencies into your image.
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You can set environment variables and do all kinds of other stuff, then the last thing you'll do is set a default command that's executed when you start up a container.
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And now, we can create the image file by running the docker build command.
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It goes through each step in our Docker file to build the image layer by layer.
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We can then bring this image to life as a container with the docker run command.
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As your app demands more resources, you can run it on multiple machines, multiple clouds, on-prem, or wherever you want reliably.
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This has been Docker in 100 seconds.
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If you enjoyed it, make sure to like and subscribe, and stay tuned for more Docker content coming to this channel soon.
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Thanks for watching, and I will see you in the next one.
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