All language subtitles for Free-CCNA-Containers-Day-54-part-2-CCNA-200-301-Complete-Course_en

This is a complete course for the CCNA.

In this video we will cover a topic related\n

Containers are similar to VMs, virtual machines,\n

If you are interested in the field of DevOps,\n

For the CCNA however, you only need to understand\n

Here’s what we’ll cover in this video.

First we will review virtual machines.

Containers are a similar technology to virtual\n

Then we will look at containers.

You may have heard of Docker before, the most\n

Finally we will spend some time comparing\n

To begin, here’s an example of apps running\n

There is a single operating system, for example\n

of that OS all of the apps are running.

A problem in one app could affect all of the\nother apps.

Now, you could isolate them by buying a separate\n

that is extremely cost-inefficient.

Virtual Machines are a solution to this problem.

Virtual Machines, VMs, allow multiple operating\n

and then apps are installed on those operating\nsystems.

A hypervisor is used to manage and allocate\n

Remember, the VMs are all running on top of\n

hypervisor to allocate those resources appropriately.

There are two main types of hypervisors, Type\n

hypervisors, run directly on top of hardware.

That is the top diagram, notice the Type 1\n

with each VM then running on top of the hypervisor.

Type 2 hypervisors, also known as Hosted hypervisors,\n

or perhaps macOS or some kind of Linux.

That is shown in the bottom diagram.

On top of the hardware there is a Host OS,\n

Type 1 hypervisors are widely used in data\ncenter environments.

If an enterprise has servers installed in\n

in those servers, you can be sure those VMs\n

Type 2 hypervisors, on the other hand, are\n

For example, running a virtual network lab\n

For my personal studies, I use CML to run\nvirtual labs.

Windows is installed on my PC hardware, I\n

in Windows, and then CML runs as a VM in Workstation.

Note that the OS in each VM can be the same\nor different.

If you are running multiple VMs, one can be\n

other macOS, that’s no problem.

The binaries and libraries that I have indicated\n

and services needed by the Apps running in\neach VM.

A VM allows its app or apps to run in an isolated\n

If there is an issue with one app or one of\n

And VMs are easy to create, delete, move,\netc.

For example a VM can be easily saved and moved\n

Here’s a very simple diagram to help you\n

Type 1 runs directly on hardware, and Type\n2 runs on a Host OS.

Virtualization using VMs allows much more\n

However, containers are a more recent virtualization\n

Let’s move on to the main topic of today’s\n

This diagram shows the basic architecture\nof how containers run.

Containers are software packages that contain\n

and libraries in the diagram, for the contained\napp to run.

Note that multiple apps can be run in a single\n

You can generally assume that one container\nmeans one app.

Containers run on a Container Engine, for\n

And that container engine is run on a host\n

Containers are lightweight and include only\n

No need to run an OS in each container, unlike\nin VMs.

That is the major difference between VMs and\n

All of the different costs and benefits of\n

Now, a container orchestrator is a software\n

For example you might have heard of Kubernetes,\n

Docker also has one called Docker Swarm.

Now, why would we need a container orchestrator?

Well, in small numbers manual operation of\n

for example involving microservices, can require\n

That many containers cannot be realistically\nmanaged manually.

Since I mentioned microservices, Microservice\n

that divides a larger solution into smaller\n

So instead of one monolithic app, you might\n

together to form the larger solution.

And those microservices all run in containers\n

So, that’s a very quick overview of containers.

Now let’s compare VMs and containers.

As I mentioned before, these differences all\n

OS, whereas containers all run on top of a\nshared OS.

That major architectural difference has some\n

First of all, VMs can take minutes to boot\n

This makes containers much more agile.

For example, if one container crashes it takes\n

And VMs take up more disk space, often tens\n

Again, that stems from the fact that each\n

only contains an app and its dependencies.

And for the same reason, VMs use more CPU\n

Regarding portability, VMs are quite portable\n

the same hypervisor, but containers are even\nmore so.

They are smaller, faster to boot up, and Docker\n

So, with these points containers are looking\n

One advantage is that VMs are more isolated\n

An issue on one OS won’t affect apps in\nother VMs.

However that can’t be said for containers;\n

the containers are all affected.

Note that this isolation also provides security\n

To summarize; there is a major movement toward\n

rise of microservices, automation, and DevOps,\n

But VMs are still widely used today and they\n

The discussion of VMs versus containers has\n

Do a search on Google or YouTube and you’ll\n

Here’s what we covered in this video.

First we briefly reviewed virtual machines,\n

Containers and VMs are similar but also different\nin key ways.

There is, of course, a lot of depth to the\n

For the CCNA you should just know the basics\n

interested in learning more there are countless\n

Okay, let’s go to the quiz, here’s question\n1.

SLIDE9\nIdentify the three components below that containers

Pause the video now to think about the answer.

Okay, the three components are the hardware,\n

and the container engine which runs on top\nof the OS.

Then the containers all run on top of the\ncontainer engine.

Which of the following are examples of container\norchestrators?

(select two) Pause the video now to select\nthe answers.

Okay, the answers are B, Docker Swarm and\nC, Kubernetes.

They are both popular container orchestration\n

Docker Engine is a container engine which\n

And Hyper-V is a Type-1 hypervisor by Microsoft,\n

Which of the following statements about VMs\n

the video now to select the best answers.

Okay, the answers are A, C, and F. VMs require\n

VMs are more isolated than containers, again\n

Containers, on the other hand, all run on\n

Okay, that’s all for the quiz and this video.

I hope this video was helpful, thanks for\nwatching.