Introduction to Containers and Docker for PHP developers

1. An Introduction to
Containers and Docker
for PHP Developers
presented by
Robert McFrazier
1

2. @rmcfrazier
http://blog.robert.mcfrazier.com
Robert
McFrazier
2

3. 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
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4. Linux Containers
Software 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.
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5. 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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6. Linux Containers
Containers 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.
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7. 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.
Docker
What is Docker ?

8. https://docs.docker.com/installation/
Instructions for installing Docker on 20 different OS/
Platforms.
Docker
Installing Docker

9. 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 Compose
What is Docker

10. https://docs.docker.com/compose/install/
curl -L https://github.com/docker/compose/releases/
download/1.5.2/docker-compose-`uname -s`-`uname -m`
> /usr/local/bin/docker-compose
Docker Compose
Installing Docker

11. Docker
Container 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.

12. Vagrant
Why include Vagrant?
• Vagrant is is used to supply a Linux Docker host.
• 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.

13. Questions ?

14. @rmcfrazier
http://blog.robert.mcfrazier.com
https://legacy.joind.in/16787
https://github.com/rmcfrazier/sunshinephp_2016
Robert
McFrazier
14