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[Intro Music]

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We just added two additional

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services to our 'docker-compose'

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file, namely mongo and mongo-

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express. mongo image contains

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actual MongoDB daemon with Mongo

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CLI utility; and mongo-express is

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graphical user interface for mongo;

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and mongo-express is written using

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Node.js and express module. So

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let's now go ahead and bring up all

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those services. And for that we will

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utilize as usually 'docker-compose

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up' command. Also for mongo-express

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container we expose internal port

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8081 to external port 8081

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on your computer. And that means

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that we will be able to connect to

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mongo-express application using any

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web browser using address localhost

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:8081. Also, mongo-express is

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able to connect to mongo using its

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hostname 'mongo', and corresponding

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credentials for admin user of the

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database. 'root' is username for

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such user, and password is its

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password. All right, let's now go

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ahead and bring up those services.

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Let's go to the terminal where I'm

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already running such containers as

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'api' and 'frontend'. Here they are.

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And let's simply try to enter

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command 'docker-compose up'. I will

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omit for now '-d' option that

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stands for detached because I want

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to show you actual logs that will

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be generated by mongo and mongo-

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express containers. That's why

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let's simply enter 'docker-compose

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up' like that. Let's go ahead.

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Docker starts by pulling mongo

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image from Docker Hub, it usually

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consists of multiple layers. And

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here you see that separate layers

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are downloaded separately. Let's

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wait a bit until the load process is complete.

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mongo image was

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successfully downloaded. Here I see

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status informational message about

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that. And now 'docker-compose' is

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'Pulling mongo-express'. And

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similarly it consists of multiple

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layers, and all those layers are

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downloaded, and afterwards

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extracted. mongo-express image was

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downloaded as well. And you see

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also that frontend and api

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containers are up to date, there

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is no need to recreate them. But

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it is necessary to create a new

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container for mongo. Here I see

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that a new container was created.

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And also new container for mongo-

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express was created as well. And

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afterwards, I see actual logs from

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mongo-express container. Here they

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are; and from mongo container, for

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instance, here. Let me scroll to

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the very end of this output. And

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for instance, here I see such

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message as, 'Admin Database connected'.

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That comes from mongo-express

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container. And also a bit up I

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should see 'Database connected'

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message. And yes, here it is.

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It also comes from mongo-express.

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On mongo container, I see such

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message as 'Successful

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authentication'; and that means that

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mongo-express successfully

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authenticated at mongo. 'Connection

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accepted' message also comes from

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mongo container. And it seems that

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now connectivity between mongo-

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express and mongo is established.

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And notice here that in 'client'

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section, mongo shows us IP address

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of the mongo-express container.

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That's what I told you before. All

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containers communicate with each

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other using IP addresses, and those

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IP addresses are assigned by Docker

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internally. All right, let me

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actually bring down now all those

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containers in order to avoid all

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sorts of logs here, and bring up

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them in detached mode. Let's press

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'CTRL+C' here, stopping all four

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containers. mongo-express, mongo,

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frontend and api containers were

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stopped. Now there are no

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containers running. And now let's

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bring them up again, using command

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'docker-compose up' with option '-d'

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detached. Let's do that. Now

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there is no need to pull new images

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for mongo and mongo-express because

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they are already present locally in

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Docker cache. That's why it makes

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sense only to start new containers.

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And that's what Docker does here on

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those lines, starting all four

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containers. Containers were

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started. Here they are. And now,

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let's actually explore those

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containers. And first, after the

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small pause, let me explain to you

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how to get information about

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containers using Docker Desktop

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Dashboard. This one. I'll see you

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guys just in a moment.

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[no audio]