Automated Deploy Docker Containers on CoreOS

桂阳
Docker Meetup Beijing 7/13/2014

Agenda

• CoreOS features.
• Intro to main components of CoreOS.
• Demonstration for CoreOS cluster
• management on my laptop.
• Deploy Docker images on CoreOS.
• Docker Meetup Beijing 7/13/2014
  

CoreOS Features

• LXC and Application container.
• No package manager.
• Docker containers
• Painless updating.
• Clustered by default .
• Distributed systems tools.
• Service discovery .
  

Virtualization

• Hypervisor
• Container
• Application
• Container
• lightweight

Hypervisor

• Hardware emulation (many virtual hardwares ).
• Host machine / Guest machine, can run different OSs.
• Lower density, performance, scalability, security.

Container

• Real machine, host provides Kernel,
• one kernel many userspace instances.
• Filesystem, network interface, etc.
• High density, dynamic resource allocation.
• Native performance, no overhead (almost).

Application Container

• Starts from application (not /sbin/init as Container).
• Filesystem: read-only, shared, slave, private.
• User data, socket fd etc. 

Painless updating

• CoreOS is currently booted off partition A.
• An update is installed onto partition B.
• Machine is rebooted onto the B partition.