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DOCKER.md

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🐳 Docker

We adopted a whale!

Docker is a software technology providing operating-system-level virtualization also known as "containers".

How to Install

You'll find that docker is already installed for you on the golden image! No need to install it on your host.

What is a Dockerfile?

Docker allows you to build your own custom containers. The way you to this is by creating a Dockerfile.

FROM centos:7

RUN yum -y --setopt=tsflags=nodocs update && \
    yum -y --setopt=tsflags=nodocs install httpd && \
    yum clean all

EXPOSE 80

# Simple startup script to avoid some issues observed with container restart
ADD run-httpd.sh /run-httpd.sh
RUN chmod -v +x /run-httpd.sh

CMD ["/run-httpd.sh"]
  • FROM tells docker what base image you want to use. We're using a centos 7 variant.
  • RUN allows you to run some shell commands. Specifically, the example is using yum to install stuff.
  • EXPOSE will allow the docker container to listen on a specific port.
  • ADD allows you to add files form the host to the docker guest image.
  • CMD will run the command as the main process for this httpd container, running the server.