Tag Archives: CoreOS

Docker Networking – CoreOS Flannel

Containers & Kubernetes, , ,

This blog is part of my ongoing series on Docker containers. In this blog, I will cover Flannel which is a CoreOS networking solution to connect containers across multiple hosts. Please refer to my first blog on CoreOS to understand CoreOS basics as well as how to setup CoreOS cluster.

Flannel Overview:

Flannel creates an Overlay network using either udp or vxlan encapsulation. Flannel links itself to the Docker bridge to which the containers are attached and creates the overlay. Following picture illustrates this.

coreos3

Demo:

Lets create 3 containers in 3 different CoreOS hosts that are part of same cluster in 11.0.0.0/16 subnet, connect them using Flannel and try to ping them. Create the 3 node cluster using the procedure in my previous CoreOS blog.

Continue reading Docker Networking – CoreOS Flannel →

CoreOS overview

Containers & Kubernetes, ,

This blog is part of my ongoing series on Docker containers. In this blog, I will cover basics of CoreOS and some hands-on stuff I tried with CoreOS. As mentioned in my other blog on Docker  orchestration, CoreOS falls in the category of specialized Linux distributions that can host Containers and are suitable for massive server deployments.

CoreOS is a Linux distribution with very minimal services installed and the primary goal is to have a scalable clustering system. Following 2 pictures from CoreOS shows the details from both single host perspective as well as Cluster perspective.

Continue reading CoreOS overview →