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[Intro Music]

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Before going on with Python, let me

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demonstrate you how you're able to

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remove containers and prune

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containers. Because at the moment,

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there are actually a lot of

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containers that we have created

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before, but now they are stopped.

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Also, you are actually able to

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start over any stopped container.

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Actually, at the moment, there are

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still two nginx containers running.

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Let me stop them. And afterwards,

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I'll demonstrate you how to start

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over stopped container, remove stopped

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container, and prune all stopped

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containers. Let's do that. Let me

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stop this container, and let me

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stop this one as well. And I don't

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need the two windows anymore. Let

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me use just one like this. And I

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could go out from the nginx1

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folder. Let's 'cd' to

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'containers', and let's clear

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terminal, and let's list

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containers that are currently

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running. And as you have guessed,

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probably there are no containers

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running at the moment. But if I

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enter 'docker ps -a', you

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should see all previous containers

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starting from the very first one

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where we have used the hello-world

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image. Also, if you scroll to the

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beginning of this output, you

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should see nginx containers that

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were exited just several minutes

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ago. Here are those containers in

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my case. And you see that this

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container was exited 30 seconds ago

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and this one 48 seconds ago. And those

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containers were created 24 hours

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ago. Great. Let me now demonstrate

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you how we are able to start over

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stopped containers or exited

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containers. Let me for example, try

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to run over this container with

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name 'nginx2'. Let's do so. Clear

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terminal. And for that you could

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use Command 'docker start', and

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ID or name of the container. We

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have created named containers, that's

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why I'm able to use those names

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here, nginx1 or nginx2.

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Let's use 'nginx2' name here.

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Container was started, and I could

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verify that using 'docker ps'

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command. And you'll see that now

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this container is again up and

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running. Let's verify whether I

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will be able to connect to this

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nginx server or not using this

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external port. Let's go to web

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browser, actually I have those two

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tabs open, let me close this one, and

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let's refresh this page, and you

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see that it actually works. And it

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works even if I am located not

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inside of the nginx2 folder.

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You see that now I am in 'containers'

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folder. In this case it does not

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matter because this container is

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actually configuration has mapping

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of specific folder, 'nginx2'

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folder to internal folder inside of

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the container. That's why there is

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no need to move into nginx2

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folder, and start container there.

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Let me actually verify whether I

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will be able to modify files. Let's

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go to nginx2 folder, index.html,

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and add one more exclamation mark

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here, go to web browser, refresh page,

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and yes it works. That's how

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you're able to start over any

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stopped container. As a challenge

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you could start for example nginx1

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container, and verify whether it

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will still work or not. Also as a

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challenge you are able to try to

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start any other of the stopped

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containers. Next, let me now first

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stop this container, and I am

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able to use Command 'docker stop', and

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use either ID of the container or

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its name. Let's use first few

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characters of the ID, '6e', and

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container was stopped. Let's verify

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that. 'docker ps', and yes there are no

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containers currently running. But if I

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list the containers in the history,

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I'll still see nginx2 container,

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here it is with nginx2 name. Great.

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Let me now demonstrate you how we

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are able to remove a specific

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container from this list. For that

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you could use the command 'docker rm',

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or 'docker container rm'. Let's first

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try 'docker rm'. Let's clear

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terminal, 'docker rm', and here type

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name or ID of the container, let's

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type nginx2. Container was

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removed. And now if I list

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containers, 'docker ps -a', scroll up,

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[no audio]

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I will see that there is no nginx2

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container anymore. And basically

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we have performed this action

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before in one of the previous

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lectures when we have tried to

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create a container with the same

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name; and Docker does not allow you

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to do so. It is not possible to

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create containers with the same

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name even if a container was

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stopped. Great. Let me now try to

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stop any other container, actually,

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sorry, remove container, and let me

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do so with a container with this

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name. Let me copy this name, it was

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ubuntu container, and let's use the

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'docker rm' command again, and paste

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here name of that container,

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and container was removed. Let's remove

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for example also this one. Let me

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copy this name. In your case, you

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could choose any other names of

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your containers because those names

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were randomly generated, that's why

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in your case names will be

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different. 'docker rm', paste this name,

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and this container was removed as

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well. If you want to remove all

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stopped containers just in a one

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shift, you are able to use the

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command 'docker prune'. Let me

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actually use 'docker --help'

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command and show you a description of

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that command. And we need to

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basically use Management Command,

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Container Management Command. Let

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me scroll up, and this command

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should be used. So let me type here

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'docker container --help',

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instead of simply 'docker --help'; and

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here you'll find a list of commands

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that you are able to use with

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Container Management Command. And

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here is 'prune' command that will

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remove all stopped containers. And

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now's a good time to remove all

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stopped containers just in one shift

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using one command 'docker container

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prune'. Let's do that. Let's clear

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terminal, 'docker container

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prune'. 'This will remove all stopped

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containers. Are you sure you want

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to continue?' And if you are sure,

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just type 'Y', and press Enter; and

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all containers were removed. And

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the total reclaimed space is 766

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bytes. It is less than one

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kilobyte. And that is actually the

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beauty of Docker, all those

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containers that were run before and

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that were stopped afterwards used

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less than one kilobyte of disk

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size. All right. That's how we were

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able to remove all stopped containers.

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And you could verify that using

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'docker ps -a', and you'll see no

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containers here in the history.

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Actually I have forgotten to

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demonstrate you how you are able

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to remove multiple containers using

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multiple IDs. Let me quickly

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demonstrate you that. Let me clear

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terminal and quickly run two

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containers, for example, 'docker run alpine'

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[no audio]

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and 'docker run alpine' once

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again. And now I should have two

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stopped containers. And yes, that

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is the case. And now let me use

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'docker container rm' command,

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actually it is equivalent to 'docker rm'

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command, and here I could type

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multiple names or multiple IDs of

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containers that I want to remove.

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Let me type here '05' like so, and

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after space '78', starting

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characters of those IDs of those

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two containers, this one and this

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one. Let's press Enter. And both

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containers were removed. 'docker ps

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-a', and I see no containers on

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the list. That's how you're able to

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use either 'rm' command or 'prune'

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command. And if you don't need

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containers anymore, from time to

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time run those commands in order to

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clean space and in order to free

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namespaces. That's all for this

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lecture, and next let's move on to

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python image, and create the

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container based on python image.

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Let's do that next. Bye-Bye.

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[no audio]