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[intro music]

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Hi guys, welcome to the next

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section. In the previous section we

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have talked about the main Docker

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components like Docker Client,

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Docker Host, Docker Server,

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Docker Image, Docker Container,

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Docker Registry, and Docker

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Repository. And also I have

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explained you differences between

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the virtual machines and Docker

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containers. And in this section, we

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will start some practice

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activities. And I would like to

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start with explanation of list of

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commands that you are able to use

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in Docker. And there are two

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different blocks of commands called

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Management Commands and Commands.

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Historically, before in Docker,

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there were only Commands. But as

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you see here on this diagram, list

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of commands is very large. And as

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soon as the list of Docker commands

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became very large, Docker

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developers have decided to split

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those commands into Management

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Commands. And now there are several

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Management Commands available like,

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container, context, image, network,

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node, plugin, and so on. And

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basically, along with Management

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Commands, you are able to use

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additional commands. It means that

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Management Commands require

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additional commands as arguments.

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Let me now quickly go to terminal

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and show you those commands in

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practice. 'docker', and you should get

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the list of all available commands

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with short descriptions. And if you

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scroll up to the beginning of this

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output, you'll see Management

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Commands block. For example, using

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'image' Management Command, you are

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able to manage images. Using 'secret'

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command, you're able to manage

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Docker secrets. Using 'volume'

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Management Command, you're able to

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manage volumes. Also below you'll

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see a list of Commands. And those

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commands basically don't require

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additional arguments, but some of

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them have available options and

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you're able to supply some

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additional arguments as options.

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For example, there are such kind of

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commands as exec, export, images.

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With 'images' command, you're able to

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list images that exist in your

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local cache. With for example, 'ps'

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command, you're able to list the

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containers that are currently

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running. That's the commands that

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you could use. Alright, next, let

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me explain you how you're able to

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get help about a specific command.

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Let me clear a terminal, Command K.

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And here type 'docker ps --help'.

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'ps' is a regular command,

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it is not a Management Command. And

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let's press Enter. And here in this

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output, you'll see which options

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you are able to use along with

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'docker ps' command. There are short

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versions of every option like

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'-a', and there are also long versions

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of every option like '--all'. And

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if some longer options have

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available shortcuts, then they will

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be listed on the same line, like

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this option, '-a', or '--all'.

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And with this option,

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you're able for example, to show

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all containers including stopped

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containers. In the same way you're

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able to get help about Management

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Commands. For example, if I'll type

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'docker container --help'.

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And in this output, you'll see a

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list of available sub-commands that

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you're able to use along with

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'docker container' Management

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Command, like attach, commit,

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cp, create, diff, and so on. If you

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want to get help about specific

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command for Management Command, you

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need to type this sub-command after

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Management Command like this, 'docker

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container', let's say I want to get

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help about 'wait' command, 'wait', and

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next I will add option '--help'.

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And here in this output,

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you'll see basically help for this

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specific command that you can use

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along with this 'container'

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Management Command. And you'll see

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that this 'wait' command will, 'Block

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until one or more containers stop,

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then print their exit codes'. Also,

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let's have a look at the help for

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example for 'rm' command. 'docker

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container rm --help'. And

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you'll see that this sub-command

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has basically some additional

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available options like '-f' or

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'--force'; '-l' or

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'--link', and '-v' or

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'--volumes'. Alright, that's how

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you're able to get help about

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Docker Commands and Docker

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Management Commands. But basically

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some of Docker Commands are

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redundant to Docker Management

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Commands. And let me talk about

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that in the next lecture. I'll see there. Bye-Bye.

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[no audio]