“Container Adventures: Hiro and Yumi Explore the World of Docker”
We see a developer, Hiro, working on his laptop, looking like he’s about to pull his hair out. A colleague, Yumi, approaches him and asks what’s wrong. Hiro explains that he can’t seem to get his application to run on different machines, and he’s starting to lose his mind.
docker run -it -v /path/to/app:/app image-name
Yumi looks at Hiro sympathetically and suggests he try using Docker containers. She explains that Docker is like a shipping container, it can transport your application anywhere, no matter how crazy the destination.
docker build -t image-name .
Hiro looks a little confused and asks Yumi how a shipping container is supposed to help him. Suddenly, we see Yumi in a sailor’s hat, using a crane to lift a shipping container with Hiro’s application inside. She shouts back at Hiro, “Don’t worry, Hiro, we’ll ship your app to the moon if we have to!”
docker push image-name
Hiro blinks, then bursts out laughing. He asks Yumi how to get started with this crazy shipping container technology. Yumi pulls out a tiny boat, and tells Hiro he can start with a “docker dinghy”. Hiro looks at the tiny boat skeptically, but decides to give it a try.
docker run -d -p 80:80 --name container-name image-name
We see Hiro floating in the docker dinghy, surrounded by giant shipping containers. Yumi, who has now put on a captain’s hat, is shouting instructions to him through a megaphone. “Turn left at the nginx container, then go straight until you see the postgres container!”
docker run -v /path/to/app:/app \
--network my-network \
-e DATABASE_URL=postgres://username:password@postgres:5432/my-db \
-p 8080:8080 \
-d myapp:latest
docker run -v /path/to/app:/app \
--network my-network \
-p 8080:80 \
-d nginx:latest
docker run --network my-network \
-e POSTGRES_PASSWORD=password \
-e POSTGRES_USER=username \
-e POSTGRES_DB=my-db \
-d postgres:latest
Hiro finally reaches his destination, a small island in the middle of the ocean. He’s relieved to find that his application is running perfectly on the island’s only computer. Yumi pops up behind him, holding a giant beach umbrella. “Welcome to your new office, Hiro!” she exclaims. Hiro looks at her, then at the shipping containers surrounding him, and shakes his head in disbelief.
> docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
53e2761b7a78 nginx:latest "/docker-entrypoint.…" 30 seconds ago Up 28 seconds 0.0.0.0:8080->80/tcp mystifying_hamilton
3e5d9388d1c9 postgres:latest "docker-entrypoint.s…" 30 seconds ago Up 28 seconds 5432/tcp pensive_meninsky
3e5d9388d1c9 myapp:latest "docker-entrypoint.s…" 30 seconds ago Up 28 seconds 0.0.0.0:8080->8080/tcp apple_banana
