Anton Marchukov

The world is not perfect and network failures do happen. Complaining about instability might not always be enough. Especially when your system depends on multiple networked services and each of them is on a critical path to the final result.

This talk will follow a real story of an attempt to implement network errors handling by retries functionality that is inside urllib3 and requests Python libraries. More importantly we will simulate poor network conditions on a local machine using Linux Network Emulator and then will reason on how effective the attempt was and what can be further improved.

This is a proper treatment the networked systems should get when they are designed, developed and tested. And it is great that all the tools necessary are already there in most popular Linux distributions.

Repoman is a tool developed in-house and used as a core tool in oVirt CI and release processes. It aids the process of integrating RPM packages from multiple sources into the single repo. Made to be self-contained, so it is easy to use from CI. Come and see what our use cases at oVirt are and how we use repoman to solve them. Being developed with an abstraction in mind it might be helpful to you too.