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An Introduction to Containers and Docker
for PHP Developerspresented by
Robert McFrazier
1
Agenda• What are Linux containers
• What is Docker
• What is Docker Compose
• Why use Vagrant
• Using Docker
• Creating a PHP development environment using Vagrant and Docker
• How the PHP community can use containers
3
Linux ContainersSoftware that interfaces with the Linux kernel containment
features.
Namespaces • Enable creating an abstraction of a particular global
system resource and make it appear as a separated instance to processes within a namespace.
Control Groups (cgroups) • The kernel uses cgroups to group processes for the
purpose of system resource management. Cgroups allocate CPU time, system memory, network bandwidth, or combinations of these among user-defined groups of tasks.
4
Linux Containers
Containers fall between a chroot and a full fledged virtual machine.
Application level containers have a best practice convention of one process per container.
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Linux ContainersContainers offer less isolation compared to a VM because each
container shares the Linux kernel, and possibly binaries and libraries, but they also have a lower resource overhead.
6Diagram source: Docker Inc.
Docker is a container technology that allows you to package an application with all of its dependencies into
a standardized unit for software development.
Docker allows applications to share the same Linux kernel as the Docker host. Applications need to be
bundled with any software not already installed on the Docker host.
DockerWhat is Docker ?
https://docs.docker.com/installation/
Instructions for installing Docker on 20 different OS/Platforms.
curl -sSL https://get.docker.com/ | sh
DockerInstalling Docker
Compose is a tool for defining and running multi-container applications with Docker.
You define a multi-container application, then spin your application up in a single command which does
everything that needs to be done to get it running.
Docker ComposeWhat is Docker Compose?
https://docs.docker.com/compose/install/
curl -L https://github.com/docker/compose/releases/download/1.4/docker-compose-`uname -s`-`uname -m` >
/usr/local/bin/docker-compose
Docker ComposeInstalling Docker Compose
DockerContainer vs. Image
How are a container and an image different?
• An image is a read-only template used to create containers.
• Images are built. • Containers are started/stopped.
VagrantWhy include Vagrant?
• Vagrant is is used to supply a Linux Docker host. • Vagrant also gives us the ability to have a shared folder. • Even if you are on a Linux OS can still use Vagrant, but
not required. • Vagrant also gives us Shared folders and make
forwarding ports easy.
DockerOps Focused
Docker has been focused on container deployment.
Questions ?
All config/code is in Github
https://github.com/rmcfrazier/pnwphp-docker-intro
@rmcfrazier http://blog.robert.mcfrazier.com
https://github.com/rmcfrazier/pnwphp-docker-intro
https://joind.in/14931
Robert McFrazier
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