How to change the default Docker network in CentOS 6

One of the dev teams I used to support has been using Docker for jobs started on Jenkins executors(worker nodes).  The Jenkins worker nodes  have been around for a while  and consequently run CentOS 6 with older docker-io packages installed.

When I was asked to provision some new executors I was at a loss because there is very little documentation for installing docker in CentOS 6.  In fact it’s recommended by Docker not to use the older Linux kernels(2.6.x).

Goals of this post:

  • Install  docker-io on CentOS 6
  • configure daemon options – default network
Written by mattb in: Linux | Tags: , , , , , , ,

OpenStack RDO Queens: Magnum – Kubernetes Cluster, Getting past VolumeType() Error

I’m putting together a microcloud demo based on RDO OpenStack.  I really want to see Kubernetes container orchestration in action!  Unfortunately the RDO packstack “all-in-one” distribution of OpenStack is rife with bugs and has few examples on setting up core services like Docker and Kubernetes support.  One thing I like about Ansible documentation is that all their module commands have real world examples that work.  There is little confusion on how playbooks should be written.  The OpenStack docs read like long man files with examples periodically sprinkled in.

Starting with this article I intend to write a series on setting up OpenStack RDO.  Along the way I’ll provide explanations, setup examples in Horizon and solutions to common OpenStack problems.  Today we are tackling volume creation error upon cluster creation.