Lanzando un hola mundo 21-22

Para lanzar una instancia de la imagen helloworld, primero vamos a comprobar que existe:

# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              05a3bd381fc2        6 weeks ago         1.84kB

Para lanzarla, podemos usar el comando 'docker run':

# docker run hello-world

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/