Containers

Getting started with containers is easy! Follow along and ask questions, we're here to help.

Outcomes

You should be able to:

• Understand the install and use a docker runtime and client
• Containerize an application

Outline

1. Install Docker

   The best way, on Linux nodes, is to use the script:

   curl -fsSL get.docker.com -o get-docker.sh && sudo sh get-docker.sh && sudo systemctl start docker && sudo systemctl enable docker
   

   Don't forget to add your user to the docker group:

   sudo usermod -aG docker $USER
   

   You'll need to logout and login again for the group change to take effect.

2. Run a container

   docker run busybox echo Hello World
   

   What just happened?

   1. The docker client contacted the docker daemon process
   2. The docker daemon pulled the "busybox" 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
   5. The docker daemon then exited
   6. The docker client exited
   7. The container was destroyed

3. Run a container in the background

   docker run -d -p 80:80 nginx
   

   Connect to the nginx container:

   curl localhost
   

4. Run a container in the background

docker run -d -p 80:80 nginx