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Konstantinos Tsakalozos

PROFILE

Konstantinos Tsakalozos

Worked on the canonical/microk8s and canonical/k8s-snap repositories, delivering features that improved security, maintainability, and test coverage. Enhanced MicroK8s documentation for clarity and reduced maintenance, and implemented environment-variable-driven test configuration to enable multi-distro CI testing. Updated dashboard validation logic and prepared MicroK8s for the 1.34 release by refining Kubernetes component configurations and hardening security with AppArmor and NoNewPrivileges. Modernized networking in k8s-snap by replacing kube-proxy with Cilium’s eBPF-based service routing, and ensured TLS certificate compliance for Python 3.13. Demonstrated expertise in Go, Python, Kubernetes, CI/CD, and security-focused system programming across all contributions.

Overall Statistics

Feature vs Bugs

86%Features

Repository Contributions

8Total
Bugs
1
Commits
8
Features
6
Lines of code
619
Activity Months4

Work History

June 2026

3 Commits • 2 Features

Jun 1, 2026

June 2026 performance snapshot focusing on delivering secure, scalable networking improvements and migrating away from legacy components. Two primary streams delivered: - canonical/microk8s: TLS Certificate Validation Compliance with Python 3.13. Added keyUsage extension and supporting cert extensions (basicConstraints, subjectKeyIdentifier, authorityKeyIdentifier) to CA certificates used by API server and front-proxy certificate generation to satisfy Python 3.13 verify requirements. This resolves TLS verification failures such as 'CA cert does not include key usage extension' and improves security posture during TLS handshakes. Commit 157f135874ba46a91abeddecac694eb085303f9e8; co-authored by Konstantinos Tsakalozos; fixes #4864. - canonical/k8s-snap: Kube-proxy replacement with Cilium eBPF service routing. Introduced eBPF-based service routing to replace kube-proxy, deprecated older kube-proxy configuration options, and aligned code/docs with the new routing mechanism while preserving backward compatibility. Commits: bd6593b422ee8a7666eb500b60057382803d811f; 97dedb9ec72e1bc57a29f7231e464209a4001acf; docs updates included in the second commit. Overall impact: Enhanced security and reliability (Python 3.13 TLS compliance), reduced architectural risk by removing kube-proxy as a separate service, and modernized the networking stack with eBPF-based routing. These changes reduce maintenance burden, improve performance, and position the platform for future scale. Technologies/skills demonstrated: Python TLS/x509 handling, TLS verification under Python 3.13, certificate generation and extension configuration, Cilium/eBPF-based service routing, Kubernetes networking, deprecation strategy, and comprehensive documentation updates.

August 2025

3 Commits • 2 Features

Aug 1, 2025

Concise monthly summary for August 2025 focused on delivering business-value features, stabilizing the platform for the 1.34 release cycle, and strengthening security posture in MicroK8s. The work emphasizes compatibility, release-readiness, and resilient configurations to support multi-version deployments and reduce operational risk.

March 2025

1 Commits • 1 Features

Mar 1, 2025

March 2025 monthly summary for canonical/microk8s focusing on test environment enhancements: - Delivered an environment-variable-driven capability to configure test Linux distributions for LXC and Multipass, enabling tests to run across different OS versions without code changes. - Ensured the specified distro is correctly passed to both lxc launch and multipass launch commands, improving test accuracy and parity across environments. - This update broadens CI coverage, allowing validation of MicroK8s compatibility with multiple distros in a single pass, reducing manual test maintenance. - No major bugs fixed within this scope; the month was focused on feature delivery and CI/test improvements that strengthen release confidence.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 (2025-02) - Canonical repository: canonical/microk8s. Focused on documentation hygiene and long-term maintenance rather than feature-area expansion. The month delivered a targeted documentation cleanup by removing the obsolete Kubernetes version shield badge from README to simplify docs and reduce ongoing maintenance. No major bugs were reported or fixed in this period; the emphasis was on improving clarity and future-proofing the README against shield maintenance drift. Impact-oriented outcomes include faster onboarding for new contributors and lower maintenance costs for README-related components. Skills demonstrated include precise Git-based change management, markdown editing, badge/shield maintenance, and adherence to documentation standards.

Activity

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Quality Metrics

Correctness90.0%
Maintainability85.0%
Architecture85.0%
Performance77.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

GoMarkdownPythonShellYAML

Technical Skills

CI/CDCertificate ManagementCiliumContainerizationDevOpsDocumentationEnvironment ConfigurationInfrastructure as CodeKubernetesPatch ManagementSecurityShell ScriptingSystem AdministrationSystem ProgrammingTesting

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

canonical/microk8s

Feb 2025 Jun 2026
4 Months active

Languages Used

MarkdownPythonGoShell

Technical Skills

DocumentationCI/CDEnvironment ConfigurationTestingContainerizationKubernetes

canonical/k8s-snap

Jun 2026 Jun 2026
1 Month active

Languages Used

MarkdownPythonYAML

Technical Skills

CiliumDevOpsInfrastructure as CodeKubernetesdocumentationeBPF