Tech/Basics
- Tech/Basics/BCE
- Tech/Basics/BIOS
- Tech/Basics/Binary
- Tech/Basics/Bootstrapping
- Tech/Basics/CLI
- Tech/Basics/Captive Portal Authentication
- Tech/Basics/Container
- Tech/Basics/DCIM
- Tech/Basics/Domain Trust
- Tech/Basics/Email
- Tech/Basics/FQDN
- Tech/Basics/Find
- Tech/Basics/Firewall
- Tech/Basics/GUI
- Tech/Basics/HID
- Tech/Basics/Help Vampire
- Tech/Basics/Horror Stories
- Tech/Basics/Hostname Naming Convention
- Tech/Basics/Infrastructure as Code
- Tech/Basics/Interview Questions
- Tech/Basics/NSCD
- Tech/Basics/PXE
- Tech/Basics/Passwords
- Tech/Basics/Shell
- Tech/Basics/Stacks
- Tech/Basics/System of Record
- Tech/Basics/Systems Policy
Basics, terms and misc tech things needed to survive in the industry.
Software Defined Network(ing) or SDN
Configuring and controlling virtual network circuits with software is a great method of reducing confusion and cable density in any datacentre or server rack implementation. Using a basic set of large backbone links and defining the virtual networking creates a solution with fewer moving parts. This setup is often driven by physical data center support issues. Often a server or switch documentation will drift over time and become difficult to support all the unique vendor configurations per device. Consider this as a flat layer 1-3 physical infrastructure with a layer 1-7 network virtualized over the top.
Introduction
Physical infrastructure was the method of running a dedicated cable from device to device in various patterns to connect items. SDN is a method of connecting everything to a larger network and then defining the network inside that larger network. It is a bit of a jump from wiring up your home router and printer.
Example
Basic Networking
Using the Tech/OSS/iproute2 we can configure a network port for an IPv4 network like so:
ip link set enp0s25 up ip a add 192.168.2.2/24 dev enp0s25
Note that this is a running configureation and it would need to be setup in the system startup configuration.