Worked on improving reliability for the bytedance/deer-flow repository by addressing upstream DNS resilience in containerized environments. Focused on preventing 502 errors that occurred after container restarts by enabling runtime DNS re-resolution for Nginx upstreams within docker-compose configurations. This solution leveraged the Nginx 'resolve' directive to dynamically update upstream IPs, reducing downtime caused by stale addresses and enhancing service uptime. The work involved DevOps practices, Docker orchestration, and Nginx configuration, with careful documentation and traceability linked to the relevant issue. The targeted bug fix aligned Nginx behavior with dynamic container workflows, supporting more robust and resilient deployments.