What are CodeScan's system requirements?

Official requirements for SonarQube can be found here.
Official requirements for Jenkins can be found here.

An example of a typical CodeScan Self-Hosted requires:

• 2 CPUs (Equivalent to AWS t2.large)
• 8GB RAM
• 100GB Disk
• Modern Linux OS

Note: depending on your use-case, this may be way too much or too little. As SonarQube stores all snapshots for a long time, the data can build up for a large project. Additionally, heavy usage for users would cause more load.