Troubleshooting & Debugging

Notes written mid-incident: what broke, how I traced it, and what actually fixed it.

• OpenStack OVN Networking - Tracing security group rules from Neutron down to OpenFlow, packet simulation with ovn-trace, and DHCP delivery: field notes from the RHOSP 16 era

• PostgreSQL on OpenShift - Recovering from a “tuple concurrently updated” crash loop after an unclean shutdown