CoreOS

Outline!

• Why we need CoreOS?
• What is CoreOS?

• Features

  • Run applications inside container using Docker

  • Service discovery using etcd

  • A distributed Init system using Fleet

  • Update philosophy for CoreOS using Update Engine

  • Reboot manager using Locksmith

• Demo

Why we need CoreOS?

Solution

• Automatic updates with CoreOS

Another reason why we need CoreOS?

Solution

• Scalable and highly available cluster with CoreOS

What is CoreOS?

• Based on Google's ChromeOS
• Mimimal OS
• Linux Distro to provide features to run modern infrastructure stack
• Designed to be distributed, fault tolerant and easy to scale

Features

Docker

• Platform for building, shipping, and running applications in Linux Containers.
• LXC made easy
• Easy to share

Demo

etcd

• Open source distributed Key value store, written in Go
• Backbone of your cluster, Configuration and service discovery
• Communication b/w nodes handled via Raft Consensus algorithm

Demo

Fleet

• Cluster manager that controls systemd at a cluster level
• Maintain N instances and re-schedules service on machine failure

Demo

Update Engine

• Updates employ a dual-partition scheme
• Based on Google's open-source project "Omaha"

Locksmith

• Reboot manager for CoreOS update engine
• Uses etcd to ensure that only one machine in a cluster boots at a time
• locksmithd reboots machine based on the strategy specified in cloud-config file

That's all.. Thanks!