Simple App Containerization hands-on lab with Docker

Running a Simple App in a Container locally

Open a command-line terminal, and run some Docker commands to verify that Docker is working as expected.

Check the latest version of docker is installed using:

docker version

Run docker ps and docker run hello-world to ensure the daemon is working as expected

docker ps

Now, you can run a simple hello-world container using “docker run.” This command will:

1. check to see if you had the hello-world software image
2. downloaded the image from the Docker Hub
3. loaded the image into the container and “ran” it

docker run hello-world

Now, we will run a simple webserver on your local machine using the nginx docker image.

Run a simple webserver in a container on your local machine

docker run -d -p 80:80 --name webserver nginx

In a web browser, go to http://localhost/ to bring up the home page.

Run docker ps while your web server is running to see details on the webserver container.

docker ps 

The output should look something like this

    CONTAINER ID        IMAGE                COMMAND                  CREATED              STATUS              PORTS                         NAMES
    56f433965490        nginx                "nginx -g 'daemon off"   About a minute ago   Up About a minute   0.0.0.0:80->80/tcp, 443/tcp   webserver

If you want to stop the webserver, type: docker stop webserver and start it again with docker start webserver

docker stop webserver
docker start webserver

To stop and remove the running container with a single command, type: docker rm -f webserver.

docker rm -f webserver

Lab Navigation

1. Lab Overview
2. Installing Docker locally
3. Running a simple app in a Docker container locally <– You are here
4. Lifecycle of a container
5. Creating and running Docker images using a Dockerfile
6. Defining and running multi-container Docker applications using Docker compose
7. Running CAT Sample App locally

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