Worked on improving DNS configuration reliability for containerized deployments in the pi-hole/docker-pi-hole repository by addressing a bug related to case sensitivity in the DNS listening mode setting. Implemented a fix to ensure the FTLCONF_dns_listeningMode variable is handled with correct casing, reducing the risk of misconfiguration in Docker bridge networks. Updated related documentation in Markdown to align setup instructions with the code, enhancing clarity for users. Employed Docker, configuration management, and documentation skills, while maintaining traceability through signed commits. The work improved deployment reliability and streamlined onboarding, contributing to reduced support overhead and more consistent Docker-based installation experiences.