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‫All right. Enough of the lectures.

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‫Let's actually give you a little bit of an assignment. Now that you've had some chances to play around

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‫the container commands

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‫in Docker, I'd like to give you a little bit of homework to start up multiple containers. We're going

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‫to go through some of the process of what it's like to set up multiple types of images in different

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‫containers at the same time.

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‫You're going to maybe need some documentation with this.

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‫You know about the --help command.

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‫With that in mind, there's also docs.docker.com.

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‫If you haven't been there, definitely take a few minutes to check it out and just click around.

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‫Even if it's not something you need to look at right away, just get an idea for the breadth of documentation

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‫there.

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‫The actual website is totally open source and you can actually use GitHub to add documentation or

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‫recommend changes. It's rare that a day that goes by that I don't go to that website. There is constant

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‫amount of new information there.

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‫I highly recommend you check it out.

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‫Most of the time when I'm actually searching Google, it ends up being one of the two or three top choices

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‫anyway.

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‫You're going to start up a three-container application. We're not actually going to set up these

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‫three different containers with application data or our source files.

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‫I just want you to get the ideas around how to start these and how they're different and managing

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‫them together.

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‫You definitely want to use the -d for detached.

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‫Then I recommend you always use --name. That's just easier to deal with when you're working

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‫on your local machine.

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‫You can name them whatever you'd like. I need you to give each one of them their own port because

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‫each container can't run in the same port as other containers

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‫if you're exposing them at the host.

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‫Right.

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‫If we're going to allow the host to listen for each container and forward traffic, they all need to

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‫run on different ports.

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‫The nginx is going to act as our proxy in this case, and it's just going to sit on port 80. The

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‫apache server or httpd is going to run on 8080.

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‫Then the mysql server is running on its default port of 3306.

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‫Again, these actually aren't going to be three containers that talk to each other in any way right

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‫yet.

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‫But we're just going to start them up and then tear them all down again.

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‫Something that you haven't yet experienced is one of the options for the container run command is

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‫an environment variable passing.

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‫So, -e or --environment will pass any environment variable you want to pass into that container.

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‫This is a very common way for us to pass environment based settings into our containers.

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‫It's quite often to have different environment variables for test or dev, versus production and the

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‫environment option is how we do that.

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‫With the mysql image you'll be using,

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‫it actually has an option for setting a random root password on bootup.

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‫The way that you find that password is actually going to be using the logs command to see at startup

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‫the first time and it will spit out to the logs what that random password is going to be.

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‫Once you start up all the containers, and you think it's correct, you can tear it all down again

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‫with the stop and the rm commands.

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‫I'd like you to use the ls command to make sure that you have them all started and that they're

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‫all cleaned up.

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‫You might need to use the ls -a to actually make sure that you've removed all of them. I'm

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‫going to leave a video after this that actually shows how I would do it in case you get stuck.

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‫Good luck. We'll see you on the next section.