OpenStack Liberty Neutron Deployment (Part 2 Network Infrastructure)

The physical network A cloud needs an „physical“ network using real „switching routers“ to transport data between the physical nodes. The physical network has the following layout: Each floating pool is implemented using one vlan on the physical network infrastructure. Each flat network requires also one vlan on the physical network. VXLAN requires also one […]

Updated: 17/01/2021 — 14:48

OpenStack Liberty Neutron Deployment (Part 1 Overview)

The deployment of OpenStack is a complex task. The most important task at the beginning is to figure out what YOU (or the company you are working for) want to implement using OpenStack as a tool to provide infrastructure resources in a data center. Will the Openstack based cloud be used by your internal customers […]

Updated: 17/01/2021 — 13:17

Backup of a WordPress Site into a Docker container

WordPress is a publishing software used by many users. This website ( is using WordPress. If somebody has a running website with useful content, it’s a good practice to backup the data. And it is a even better practice to VERIFY that the data in a backup can be read and reused. To verify the […]

Updated: 17/01/2021 — 13:17

Openstack Networking (Type driver vlan and Openvswitch)

The most challenging task, when starting to work with Openstack is the setup of the networking. There is the physical network infrastructure used by the hardware components of the cloud and the virtual network infrastructure used by the tenants of the cloud. The virtual network infrastructure must run/be mapped to the physical network infrastructure. When […]

Updated: 17/01/2021 — 13:17

SSD Wear Leveling Count

I have access to a few non enterprise SSDs running in PCs. The systems are running Linux with different workloads. Most of the SSDs are reporting smart values from the disks, e.g. Wear Leveling Count (WLC) and LBAs written. Taking these two values, it is possible to extrapolate the SSD endurance. The assumption here is, […]

Updated: 17/01/2021 — 13:17

Openstack Neutron: VXLAN and l2population

In a previous article I showed an analysis of the Openflow rules on the OVS bridge used for tunneling traffic between nodes. Openstack Neutron offers an option to populate MAC entries on br-tun. In order to use this option, the mechanism driver l2population has to be added to the file ml2_conf.ini . [ml2] type_drivers = […]

Updated: 17/01/2021 — 13:18