flyingcircusio/fc-nixos
Nov 2024 – Jan 2026
9 Months active
Languages Used
MarkdownNixPythonShell
Technical Skills
Backend DevelopmentBug FixingDevOpsInfrastructure ManagementSystem AdministrationNixOS
Tobias Stenzel
PROFILE
Tobias Stenzel
Worked on the flyingcircusio/fc-nixos repository, delivering features and fixes across authentication, infrastructure, and monitoring. Developed IPv6 dual-stack networking for k3s clusters, automated via state version gating, and enhanced enterprise authentication by integrating OpenID Connect with Keycloak while maintaining LDAP compatibility. Improved system reliability by stabilizing LDAP authentication and refining RabbitMQ configuration management. Strengthened observability through Python-based TLS certificate monitoring for Nginx and Sensu-driven ACME certificate checks. Used Nix, Python, and Shell to implement infrastructure as code, configuration management, and system administration tasks, consistently focusing on maintainability, backward compatibility, and reducing operational risk across deployments.
Overall Statistics
Feature vs Bugs
55%Features
Repository Contributions
14Total
Bugs
5
Commits
14
Features
6
Lines of code
3,631
Activity Months9
Your Network
26 peopleSame Organization
@flyingcircus.io11
Shared Repositories
15
Work History
January 2026
2 Commits • 1 Features
Jan 1, 2026January 2026 (fc-nixos) monthly summary: - Key features delivered: IPv6 Dual-Stack Networking for k3s Clusters. IPv6 is enabled by default when stateVersion >= 26.05 and configurable for older versions; cluster DNS and service configurations updated to accommodate IPv6 addresses. - Major bugs fixed: None reported this month; no customer-impacting regressions. - Overall impact and accomplishments: Strengthened platform IPv6 readiness, reduced deployment complexity by codifying version-based enablement, and improved interoperability with IPv6-enabled environments; alignment with roadmap for future IPv6 adoption; demonstrated end-to-end feature delivery from code changes to cluster configuration updates. - Technologies/skills demonstrated: k3s, IPv6 dual-stack networking, state version gating, DNS/service configuration, commit hygiene and collaboration (co-authored commits).
2 Commits • 1 Features
Jan 1, 2026January 2026 (fc-nixos) monthly summary: - Key features delivered: IPv6 Dual-Stack Networking for k3s Clusters. IPv6 is enabled by default when stateVersion >= 26.05 and configurable for older versions; cluster DNS and service configurations updated to accommodate IPv6 addresses. - Major bugs fixed: None reported this month; no customer-impacting regressions. - Overall impact and accomplishments: Strengthened platform IPv6 readiness, reduced deployment complexity by codifying version-based enablement, and improved interoperability with IPv6-enabled environments; alignment with roadmap for future IPv6 adoption; demonstrated end-to-end feature delivery from code changes to cluster configuration updates. - Technologies/skills demonstrated: k3s, IPv6 dual-stack networking, state version gating, DNS/service configuration, commit hygiene and collaboration (co-authored commits).
January 2026
October 2025
3 Commits • 1 Features
Oct 1, 2025October 2025 — fc-nixos security hardening and TLS observability: Delivered two critical items for flyingcircusio/fc-nixos. (1) OIDC Admin Role Mapping Fix to ensure users authenticated via OpenID Connect receive Admin privileges; the fix escapes the 'Admin' role name to avoid unintended attribute lookups (PL-134142). (2) TLS certificate validation/monitoring for Nginx across all vhosts implemented in Python; supports both ACME and non-ACME vhosts; adds a globally installed check-tls-cert utility and extends validation to non-ACME hosts (PL-134018). These changes improve access control reliability, automate TLS posture checks, and reduce manual maintenance.
October 2025
3 Commits • 1 Features
Oct 1, 2025October 2025 — fc-nixos security hardening and TLS observability: Delivered two critical items for flyingcircusio/fc-nixos. (1) OIDC Admin Role Mapping Fix to ensure users authenticated via OpenID Connect receive Admin privileges; the fix escapes the 'Admin' role name to avoid unintended attribute lookups (PL-134142). (2) TLS certificate validation/monitoring for Nginx across all vhosts implemented in Python; supports both ACME and non-ACME vhosts; adds a globally installed check-tls-cert utility and extends validation to non-ACME hosts (PL-134018). These changes improve access control reliability, automate TLS posture checks, and reduce manual maintenance.
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for fc-nixos focusing on LDAP authentication reliability fix. The team pinned a specific JDK 8 headless package to ensure correct Java version during LDAP authentication in Graylog, addressing login failures. The fix is tracked in commit 6054cf543ca7f0e6dac53fdce6893856e8a2cb70.
1 Commits
Sep 1, 2025September 2025 monthly summary for fc-nixos focusing on LDAP authentication reliability fix. The team pinned a specific JDK 8 headless package to ensure correct Java version during LDAP authentication in Graylog, addressing login failures. The fix is tracked in commit 6054cf543ca7f0e6dac53fdce6893856e8a2cb70.
September 2025
June 2025
1 Commits
Jun 1, 20252025-06 FC-NixOS monthly summary: Stabilized LDAP authentication for fc-nixos by reverting to a headless JDK 8 build to restore LDAP login functionality. A changelog entry was added documenting the fix and its impact. This work enhances reliability for LDAP-backed deployments, preserves compatibility with existing configurations, and reduces the risk of login regressions in production.
June 2025
1 Commits
Jun 1, 20252025-06 FC-NixOS monthly summary: Stabilized LDAP authentication for fc-nixos by reverting to a headless JDK 8 build to restore LDAP login functionality. A changelog entry was added documenting the fix and its impact. This work enhances reliability for LDAP-backed deployments, preserves compatibility with existing configurations, and reduces the risk of login regressions in production.
May 2025
1 Commits • 1 Features
May 1, 2025Month: 2025-05 | Repository: flyingcircusio/fc-nixos Key features delivered: - Implemented OpenID Connect (OIDC) authentication for statshost via Keycloak, enabling SSO. OIDC is disabled by default to preserve LDAP-based auth; LDAP remains the primary method. - LDAP configuration improvements: server address and memberOf attribute are now configurable, increasing deployment flexibility across environments. Major bugs fixed: - None reported this month. Overall impact and accomplishments: - Strengthened enterprise-grade authentication capabilities with optional OIDC while preserving stability and backward compatibility. The changes reduce onboarding friction for enterprise users and improve auditing and security posture. These updates position fc-nixos for broader adoption in organizations requiring SSO. Technologies/skills demonstrated: - OpenID Connect, Keycloak, LDAP; configuration management; safe feature flagging; backward compatibility; code review and incremental rollout.
1 Commits • 1 Features
May 1, 2025Month: 2025-05 | Repository: flyingcircusio/fc-nixos Key features delivered: - Implemented OpenID Connect (OIDC) authentication for statshost via Keycloak, enabling SSO. OIDC is disabled by default to preserve LDAP-based auth; LDAP remains the primary method. - LDAP configuration improvements: server address and memberOf attribute are now configurable, increasing deployment flexibility across environments. Major bugs fixed: - None reported this month. Overall impact and accomplishments: - Strengthened enterprise-grade authentication capabilities with optional OIDC while preserving stability and backward compatibility. The changes reduce onboarding friction for enterprise users and improve auditing and security posture. These updates position fc-nixos for broader adoption in organizations requiring SSO. Technologies/skills demonstrated: - OpenID Connect, Keycloak, LDAP; configuration management; safe feature flagging; backward compatibility; code review and incremental rollout.
May 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 fc-nixos delivered enhanced ACME certificate monitoring via Sensu checks, covering HTTPS certificates used by Nginx and OpenSSL-based filesystem validation, and refined Nginx virtual-host TLS checks by correctly identifying server_name and restricting checks to SSL-enabled vhosts. This included two targeted commits to implement the changes and ensure compatibility with both HTTPS and non-HTTPS use cases.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 fc-nixos delivered enhanced ACME certificate monitoring via Sensu checks, covering HTTPS certificates used by Nginx and OpenSSL-based filesystem validation, and refined Nginx virtual-host TLS checks by correctly identifying server_name and restricting checks to SSL-enabled vhosts. This included two targeted commits to implement the changes and ensure compatibility with both HTTPS and non-HTTPS use cases.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for flyingcircusio/fc-nixos focused on simplifying configuration by removing deprecated container support across core roles (Elasticsearch, Graylog, and Loghost). This deprecation cleanup reduces configuration surface, minimizes maintenance risk, and aligns with current deployment patterns. Work delivered in a single targeted change set with minimal risk and clear traceability to the commit. No new features or critical bugs introduced; next steps include monitoring adoption and updating relevant docs to reflect the deprecation.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for flyingcircusio/fc-nixos focused on simplifying configuration by removing deprecated container support across core roles (Elasticsearch, Graylog, and Loghost). This deprecation cleanup reduces configuration surface, minimizes maintenance risk, and aligns with current deployment patterns. Work delivered in a single targeted change set with minimal risk and clear traceability to the commit. No new features or critical bugs introduced; next steps include monitoring adoption and updating relevant docs to reflect the deprecation.
February 2025
January 2025
1 Commits
Jan 1, 2025January 2025: fc-nixos reliability and safety improvements focusing on RabbitMQ integration. No new features released this month; primary work centered on hardening unit file generation to reduce deployment errors and misconfigurations across environments.
January 2025
1 Commits
Jan 1, 2025January 2025: fc-nixos reliability and safety improvements focusing on RabbitMQ integration. No new features released this month; primary work centered on hardening unit file generation to reduce deployment errors and misconfigurations across environments.
November 2024
2 Commits • 1 Features
Nov 1, 2024Month 2024-11: Delivered stability and observability improvements for fc-nixos. Key accomplishments include correcting reboot type handling during cold-to-warm merge, and restoring centralized logging/search capabilities through reintroduction of loghost, graylog, and elasticsearch6 roles, leveraging upstream Elasticsearch modules and preserved package sets.
2 Commits • 1 Features
Nov 1, 2024Month 2024-11: Delivered stability and observability improvements for fc-nixos. Key accomplishments include correcting reboot type handling during cold-to-warm merge, and restoring centralized logging/search capabilities through reintroduction of loghost, graylog, and elasticsearch6 roles, leveraging upstream Elasticsearch modules and preserved package sets.
November 2024
Activity
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Quality Metrics
Correctness94.2%
Maintainability85.0%
Architecture90.8%
Performance77.2%
AI Usage21.4%
Skills & Technologies
Programming Languages
MarkdownNixPythonShell
Technical Skills
AuthenticationBackend DevelopmentBug FixingConfiguration ManagementDevOpsInfrastructure ManagementInfrastructure as CodeKubernetesMonitoringNetwork ConfigurationNginx ConfigurationNix ConfigurationNixOSNixOS ConfigurationNixOS configuration
Repositories Contributed To
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