Adding transcript for tutorial 02

docker-for-beginners/transcripts/02-making-changes-to-docker-images.md

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+# Dock For Beginners #2 Making changes to images
+
+[00:00:00] Hello, welcome to another. How to code? Well, YouTube tutorial. My name is Peter Fisher and this is the 
+second part of the Docker image, Docker container, a set of tutorials in this tutorial, I'm going to focus on how we can
+change a minute plate, a Docker image. Once we have the image downloaded to the machine in the previous tutorial, in the
+intro tutorial.
+
+[00:00:22] A discussion on what the differences between a Docker image and what the difference is between a container
+and the things that defined the two as well as a brief tutorial, I suppose, a demonstration of how to pull down an image
+and how to run them as containers or run containers from the images.
+
+[00:00:42] I highly recommend you check that video out. The previous one because it will give you some insight and some
+better knowledge for this video. Also I've got a Docker machines tutorial, uh, that I recommend you, you watch too, if
+you haven't already done. So I'll put links to those in the description and the YouTube cards up here, uh, as I go along.
+
+[00:01:06] But, uh, today we're just going to focus on how we can minute a plate, these images once we have them. 
+So I'm going to ensure that I'm in the right machine. So let's just do Docker and machine active, and this should return
+the how to code well machine, which it does. And if we did Docker images, we shouldn't have anything here.
+
+[00:01:25] And if we did Docker, PS minus a, we shouldn't have anything there. So you can see I've got nothing up my
+sleeve. So let's just clear this down. And what I'm going to do is stop. Uh, Paul, and we're just going to get
+the, you burn to the latest you want to image. So this is, this step is exactly what we did in the previous video.
+
+[00:01:48] Uh, obviously I have more exp explanation as to what I was doing, uh, but we'll just wait until this gets in 
+store. Okay. So if we did Docker images we can get the image ID. All right. So what we need to do is create a container
+from this image first, before, you know, in order to manipulate this image, we might.
+
+[00:02:10] Get a container. Then we, uh, create this container and, uh, get into it using a bash shell. Then we install
+some bits and pieces. And then what we need to do is save though those bits and pieces to the image so we can use it
+again. So the first thing we do is Docker run and minus it. Uh, we've got the image ID here and we're going to go
+in as been.
+
+[00:02:36] Being bashed. So this again will, uh, bin bash. This will take me into a, a shell, which it does. And what I
+can do is do an app get updates. So that's going to update the sources.
+
+[00:02:55] And I'm going to install NPM. So if we go, ah, yes. So this is actually creating changes to the image. Okay. 
+This is creating changes to the image on this Docker machine.
+
+[00:03:19] And as this is running through, I would like to just explain that, uh, there are things called Docker files. 
+Now a Docker file is, um, what, what is used to actually create the images from scratch. 
+I will go into those in more detail, uh, in future videos and how to correct Docker files and so forth. But the point 
+I want to make is that it's what I'm doing now is on, uh, I'm kind of changing.
+
+[00:03:46] I'm changing the image without changing a Docker file, which in some cases is okay. Especially if I'm
+committing it back to a registry, but it's always good. If you want to start from scratch these changes to have the
+install NPM command within the Docker file as well. So then you can put that into source control and other developers 
+can use it, but anyway, I digress.
+
+[00:04:14] So let's do NPM minus V and we can see here that we've got 3.5 0.2. That's fine. And I'm just going to exit 
+out of this container. Okay. So, um, obviously if I did Docker images, If I was to remove this image and then do a pull 
+from Ubuntu. Again, I won't have the NPM because this is something that I've added myself.
+
+[00:04:38] So what I need to do is commit to this image, um, and I'm committing it to, to my, uh, local health code
+well machine. So what I do is do Docker commit, uh, In fact, actually I need to do Docker PS. My a cause, you know
+I said before that container is a snapshot of an image. So we need to do DACA commit minus no we don't Docker commit and
+then the com the container ID.
+
+[00:05:10] So it's that one there, and we need to give it a name as well. So I'm going to, do you been to. Been to
+and I'm just going to put a dash N P M hyphen NPM. So what van is going to do after I press enter is it's actually going
+to create another image or a snapshot of that container with NPM, uh, in there.
+
+[00:05:34] And if I was, uh, working against a private or a public public Docker registry in which I could log into, I
+could then do a Docker push and push this, uh, or Docker tag target, and then put it. So if I now did Docker images, we
+can see that we have a third image here. You been to hyphen NPL. So that was the first one that we got, the latest that
+we got.
+
+[00:06:00] And then this is the one that we have literally just created. So let's do a Docker PS minus a.
+I'm just going to clear the screen, uh, Docker, PS, minus a, and. So we've got that container that we were just in 
+I'm going to do a Docker RM, um, and remove it because what I want to do is do a Docker images and I want to do a Docker
+run minus i t.
+
+[00:06:31] And I'm going to use a, I'm going to use this image, the new image that we've got. And I'm going to run that.
+And actually what I'm going to do is just run NPM minus fee. Okay. So that will print out the version of NPM from the
+container. So if I did that, we should get 3.5 0.2, which we do now, if I was to do that against the previous image
+the image that we first got from the public registry, the Ubuntu repository.
+
+[00:07:03] So find it NPS. If I run that against here we will get an error and we'll get an error because NPM isn't 
+installed in that image. It is in this image, but not in that image. So if I did that, then we get an error a pretty 
+nasty one. And basically that means that the executable far can not be found in the path.
+
+[00:07:26] Um, so I'm just going to click. That down. Um, and you took up, he S minus a and likewise, if I was to let's 
+just do a Docker RM, there are other ways of actually getting into these containers using Docker exe, but I will show
+that to you later on. I'm going to just kill that and also kill that one.
+
+[00:07:53] Uh, like, so, so Docker, PS, mines, ain't got nothing there to go back to Docker images. So if we were to do
+a Docker run minus i t to the original image ID, so that's the original Ubuntu image. And then if I was to just run that
+as bin bash, And did a NPM minus V. We can see that is c'mon. It cannot be found.
+
+[00:08:26] So I'm going to exit out of you I'm going to now jump into being bash in this image and. Paste that in and do
+an NPM minus feet and we can see it is there. So this is how you create your images, where you update your images and
+you commit them. And like I said, if you, if you were connected or locked into a registry, you could then do a tag and
+a push to push this stuff up.
+
+[00:08:57] It's very important to keep committing as you go. Also, like I said, it's very important to have a Docker
+file that you can update as you go to, just to keep a record of what you've done. I'm going to leave it there, even
+though there's a lot more to, uh, to this subject, I'll probably pick that up again in the following tutorials, but if
+you've got any questions, then please do let me know, put them in the comments section below like the video, if you
+found it helpful and please do share it around, subscribe to get the next set of tutorials and also the web chats that
+I do every week.
+
+[00:09:31] So thanks again for watching and I shall see you again soon. Bye.
+