Backend design

Backend consists of the multiple process and a few utility scripts.

The main process CoprBackend is started by /usr/bin/copr_be.py script. Default backend configuration is stored in /etc/copr/copr-be.conf. Running redis server are required.

CoprBackend process starts the following components at the init:

• Centralised logging: RedisLogHandler listens for the redis pubsub for log events

• CoprJobGrab polling pending builds and actions from the copr frontend.

  Builds are routed to the appropriate task queue and action are executed by CoprJobGrab itself.

• VM management is controlled by VmMaster.

  See :ref:VmManagement: for details about Vm handling.

After spawning aux processes CoprBackend dynamically spawns and terminates worker processes Worker.

Communication with frontend

Action processing

Build lifecycle