
Michael Calmer engineered and maintained automated CI/CD pipelines and infrastructure-as-code solutions for the SUSE/susemanager-ci and uyuni-project/sumaform repositories, focusing on deployment reliability and test environment stability. He leveraged technologies such as Jenkins pipelines, Terraform, and SaltStack, integrating Groovy and shell scripting to orchestrate complex test suites and cloud-based provisioning. His work included aligning test pipelines with evolving product branches, automating environment updates, and resolving configuration drift across multiple operating systems. By refining container image management and repository synchronization, Michael reduced test flakiness and accelerated feedback cycles, demonstrating a deep understanding of DevOps practices and robust system administration in large-scale environments.

October 2025: Focused on stabilizing the Orion test environment and strengthening CI for SUSE/susemanager-ci. Key outcomes include stabilizing the Orion test environment by fixing container usage in the Terraform cucumber_testsuite to point to the base registry URL, and increasing CI coverage by updating the Jenkins pipeline to run master-staging tests against Orion with higher cadence and a refreshed test suite reference for continuous validation. These changes reduce test flakiness, accelerate feedback cycles, and establish a reliable baseline for Orion integration. Delivered via two commits: 218f125d2590827d6fa00a2a3bce1430c835c9eb (fix container_repository for test orion) and eadc9942dab8327f4efdc8515a5b727a32e15d37 (test master-staging with orion env). This work demonstrates proficiency with Terraform, container registries, cucumber_testsuite, Jenkins pipelines, and Git-based test validation, delivering meaningful business value through more reliable testing and faster integration cycles.
October 2025: Focused on stabilizing the Orion test environment and strengthening CI for SUSE/susemanager-ci. Key outcomes include stabilizing the Orion test environment by fixing container usage in the Terraform cucumber_testsuite to point to the base registry URL, and increasing CI coverage by updating the Jenkins pipeline to run master-staging tests against Orion with higher cadence and a refreshed test suite reference for continuous validation. These changes reduce test flakiness, accelerate feedback cycles, and establish a reliable baseline for Orion integration. Delivered via two commits: 218f125d2590827d6fa00a2a3bce1430c835c9eb (fix container_repository for test orion) and eadc9942dab8327f4efdc8515a5b727a32e15d37 (test master-staging with orion env). This work demonstrates proficiency with Terraform, container registries, cucumber_testsuite, Jenkins pipelines, and Git-based test validation, delivering meaningful business value through more reliable testing and faster integration cycles.
August 2025 monthly summary: Delivered core infrastructure improvements across CI/CD, Terraform-backed test infra, container image management, and Uyuni deployment on openSUSE Tumbleweed. Delivered reliable, fast feedback loops, proxy-free testing, broader platform coverage, and robust startup behavior. Demonstrated mastery of Terraform, cloud-init, container tooling, and CI/CD orchestration, delivering tangible business value: speed to release, reduced flaky tests, and more predictable deployments across multiple SUSE projects.
August 2025 monthly summary: Delivered core infrastructure improvements across CI/CD, Terraform-backed test infra, container image management, and Uyuni deployment on openSUSE Tumbleweed. Delivered reliable, fast feedback loops, proxy-free testing, broader platform coverage, and robust startup behavior. Demonstrated mastery of Terraform, cloud-init, container tooling, and CI/CD orchestration, delivering tangible business value: speed to release, reduced flaky tests, and more predictable deployments across multiple SUSE projects.
July 2025 monthly summary highlighting business value, key features delivered, major bugs fixed, and technical achievements across SUSE/susemanager-ci and uyuni-project/sumaform. Focused on delivering reliable CI/CD capabilities for SUSE Manager 5.1, stabilizing test environments, and refining infrastructure sizing to accelerate feedback loops for releases.
July 2025 monthly summary highlighting business value, key features delivered, major bugs fixed, and technical achievements across SUSE/susemanager-ci and uyuni-project/sumaform. Focused on delivering reliable CI/CD capabilities for SUSE Manager 5.1, stabilizing test environments, and refining infrastructure sizing to accelerate feedback loops for releases.
June 2025 — Uyuni project sumaform: Stabilized automated deployment pipelines and resolved package conflicts to improve deployment reliability and test execution stability.
June 2025 — Uyuni project sumaform: Stabilized automated deployment pipelines and resolved package conflicts to improve deployment reliability and test execution stability.
May 2025 performance summary for uyuni-project/sumaform focused on automated provisioning improvements and stabilization of the server_containerized workflow. Delivered features that strengthen automation, increase reliability, and improve configuration synchronization across environments.
May 2025 performance summary for uyuni-project/sumaform focused on automated provisioning improvements and stabilization of the server_containerized workflow. Delivered features that strengthen automation, increase reliability, and improve configuration synchronization across environments.
April 2025 monthly summary focusing on key accomplishments across two repositories: SUSE/susemanager-ci and uyuni-project/sumaform. Key features delivered include enhancements to the SUSE Manager CI testing environment via Terraform configuration updates and MLMTools repository URL updates for head development tools across multiple OS families. Major bugs fixed/alignments include removal of obsolete kvm_host configurations and OS-release-aware MLMTools URL handling to ensure correct references across different OS versions. Overall impact: more reliable CI provisioning, broader head-tool coverage across diverse OS families, and reduced manual maintenance. Technologies/skills demonstrated: Terraform configuration, repository URL management, cross-OS automation, and head development tooling orchestration.
April 2025 monthly summary focusing on key accomplishments across two repositories: SUSE/susemanager-ci and uyuni-project/sumaform. Key features delivered include enhancements to the SUSE Manager CI testing environment via Terraform configuration updates and MLMTools repository URL updates for head development tools across multiple OS families. Major bugs fixed/alignments include removal of obsolete kvm_host configurations and OS-release-aware MLMTools URL handling to ensure correct references across different OS versions. Overall impact: more reliable CI provisioning, broader head-tool coverage across diverse OS families, and reduced manual maintenance. Technologies/skills demonstrated: Terraform configuration, repository URL management, cross-OS automation, and head development tooling orchestration.
March 2025 monthly summary: Focused on stabilizing deployment pipelines and enabling Leap 15.6 readiness alongside product branding adjustments. Key features delivered include acceptance test alignment to a sumaform_ref fix-Multi-Linux-Manager-repository-urls branch; CI/testing updates to support Leap 15.6 and the opensuse156o image; and Terraform changes to increase the main disk size for the 4.3 reference server. Major bugs fixed involve repository URL reconfiguration after the product rename and the Leap 15.5 end-of-life update to Leap 15.6, plus a rollback of sumaform reference to master to restore stable integration in pipelines and NUE. Overall impact: improved CI reliability and deployment correctness during branding migration and platform upgrades, and groundwork for larger workloads in SUSE Manager 4.3. Technologies/skills demonstrated: Git branch management and PR workflows, CI/CD automation, Terraform infrastructure updates, Leap/openSUSE testing, and test automation.
March 2025 monthly summary: Focused on stabilizing deployment pipelines and enabling Leap 15.6 readiness alongside product branding adjustments. Key features delivered include acceptance test alignment to a sumaform_ref fix-Multi-Linux-Manager-repository-urls branch; CI/testing updates to support Leap 15.6 and the opensuse156o image; and Terraform changes to increase the main disk size for the 4.3 reference server. Major bugs fixed involve repository URL reconfiguration after the product rename and the Leap 15.5 end-of-life update to Leap 15.6, plus a rollback of sumaform reference to master to restore stable integration in pipelines and NUE. Overall impact: improved CI reliability and deployment correctness during branding migration and platform upgrades, and groundwork for larger workloads in SUSE Manager 4.3. Technologies/skills demonstrated: Git branch management and PR workflows, CI/CD automation, Terraform infrastructure updates, Leap/openSUSE testing, and test automation.
Month 2025-01 performance summary: Focused on strengthening test reliability and CI consistency across core repos (uyuni-project/sumaform and SUSE/susemanager-ci). Delivered a conditional test-suite updates feature to refresh the environment only when tests run, then performed a controlled rollback to revert the enforcement after stability assessment. Improved pipeline correctness by aligning sumaform acceptance tests to designated branches and synchronizing test-orion with master, reducing environment drift. Implemented a short-term workaround by introducing temporary development repositories to access required iptables packages, ensuring testing could continue while a long-term fix is prepared. Results: reduced test flakiness, clearer branch targeting, and maintained momentum in CI-driven validation with robust traceability.
Month 2025-01 performance summary: Focused on strengthening test reliability and CI consistency across core repos (uyuni-project/sumaform and SUSE/susemanager-ci). Delivered a conditional test-suite updates feature to refresh the environment only when tests run, then performed a controlled rollback to revert the enforcement after stability assessment. Improved pipeline correctness by aligning sumaform acceptance tests to designated branches and synchronizing test-orion with master, reducing environment drift. Implemented a short-term workaround by introducing temporary development repositories to access required iptables packages, ensuring testing could continue while a long-term fix is prepared. Results: reduced test flakiness, clearer branch targeting, and maintained momentum in CI-driven validation with robust traceability.
December 2024 monthly summary: Delivered comprehensive SL-Micro 6.1 deployment support in sumaform, enhanced container utilities deployment with version-aware repositories, rotated GPG keys for cloud provider configurations, upgraded test infrastructure to SL-Micro-61 SP7, and refined CI pipelines and image references to improve reliability of SL-Micro-61 testing. These efforts improve deployment consistency, security, testing accuracy, and overall time-to-value for customers running SLE Micro workloads.
December 2024 monthly summary: Delivered comprehensive SL-Micro 6.1 deployment support in sumaform, enhanced container utilities deployment with version-aware repositories, rotated GPG keys for cloud provider configurations, upgraded test infrastructure to SL-Micro-61 SP7, and refined CI pipelines and image references to improve reliability of SL-Micro-61 testing. These efforts improve deployment consistency, security, testing accuracy, and overall time-to-value for customers running SLE Micro workloads.
Monthly summary for 2024-10 focused on SUSE/susemanager-ci. Key achievement: CI Acceptance Tests Branch Alignment for Sumaform. In October, the sumaform_ref parameter was reverted back to 'master' in the manager-TEST-Orion-acceptance-tests Jenkins pipeline to ensure acceptance tests run against the main Sumaform branch. This change, captured in commit 783119fadf99c6c6be7727daad9740f42aa07c0f, fixed a misalignment between the test suite and the repository branch, improving test reliability and reducing false negatives. Overall, the CI pipeline now consistently targets the correct sumaform branch, stabilizing the acceptance test suite and accelerating release verification. Technologies used include Jenkins pipelines, Git branch management, and general CI/CD practices with an emphasis on test automation and reliability.
Monthly summary for 2024-10 focused on SUSE/susemanager-ci. Key achievement: CI Acceptance Tests Branch Alignment for Sumaform. In October, the sumaform_ref parameter was reverted back to 'master' in the manager-TEST-Orion-acceptance-tests Jenkins pipeline to ensure acceptance tests run against the main Sumaform branch. This change, captured in commit 783119fadf99c6c6be7727daad9740f42aa07c0f, fixed a misalignment between the test suite and the repository branch, improving test reliability and reducing false negatives. Overall, the CI pipeline now consistently targets the correct sumaform branch, stabilizing the acceptance test suite and accelerating release verification. Technologies used include Jenkins pipelines, Git branch management, and general CI/CD practices with an emphasis on test automation and reliability.
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