ops.cafe is a blog about operations, infrastructure, and the craft of keeping systems running.https://ops.cafeen-USThu, 23 Jul 2026 10:18:26 GMT60https://ops.cafe/ogImage.pnghttps://ops.cafehttps://ops.cafe/notes/sms-alerting-when-network-goes-downhttps://ops.cafe/notes/sms-alerting-when-network-goes-downBuild a bulletproof out-of-band alerting system using a USB modem. Perfect for homelabs and remote sites where network connectivity is unreliable and you need alerts that work even when everything else is down.Fri, 05 Dec 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTDenis-Florin Rendlerhttps://ops.cafe/notes/use-proxmox-sdn-ad-labhttps://ops.cafe/notes/use-proxmox-sdn-ad-labLearn how to leverage Proxmox SDN to create a robust Active Directory lab environment. This guide covers the essential steps for setting up your lab using Proxmox's software-defined networking capabilities.Wed, 20 Aug 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTproxmoxsdnactive-directoryDenis-Florin Rendlerhttps://ops.cafe/notes/nextgen-infra-event-driven-architecturehttps://ops.cafe/notes/nextgen-infra-event-driven-architectureTransform your infrastructure management with this practical approach to automation. Learn how to use Netbox and Event-Driven Ansible to create a self-service platform that maintains itself.Wed, 05 Feb 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTansiblenetboxinfrastructure-automationevent-driven-ansibledevopsconfiguration-managementDenis-Florin Rendlerhttps://ops.cafe/notes/automate-documentation-infrahttps://ops.cafe/notes/automate-documentation-infraSharing my process for automatically documenting new virtual environment created, be it a container or full virtual machines, along with all its components.Thu, 23 Jan 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTterraformnetboxcompliantdocumentationDenis-Florin Rendlerhttps://ops.cafe/notes/opentofu/opentofu-variables-tipshttps://ops.cafe/notes/opentofu/opentofu-variables-tipsThis note provides a guide to validation, dependencies, and data organization for better Terraform/OpenTofu development experiencesThu, 09 Jan 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTterraformopentofuinfrastructure-as-codedevopsDenis-Florin Rendlerhttps://ops.cafe/notes/manage-proxmox-lxc-terraformhttps://ops.cafe/notes/manage-proxmox-lxc-terraformManaging LXC containers in Proxmox is easier using Terraform. Using a modular design and workspaces we can keep IaC code manageable and user experience fun.Thu, 02 Jan 2025 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTterraforminfrastructure-as-codeproxmoxlxcDenis-Florin Rendlerhttps://ops.cafe/notes/opentofu/opentofu-infrastructure-config-managementhttps://ops.cafe/notes/opentofu/opentofu-infrastructure-config-managementOpenTofu's advanced features like workspaces, modules, and data transformations enable efficient infrastructure management through better organization and code reusability.Mon, 16 Dec 2024 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTterraformopentofuinfrastructure-as-codedevopsDenis-Florin Rendlerhttps://ops.cafe/notes/keeping-secrets-from-pipelineshttps://ops.cafe/notes/keeping-secrets-from-pipelinesExplore how a custom REST API leveraging the Keeper Secrets Manager SDK can transform your CI/CD secret management, providing a seamless and secure development pipeline.Thu, 21 Mar 2024 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTkeepersecretspasswordmanagercicdDenis-Florin Rendlerhttps://ops.cafe/notes/designing-security-workflows-using-gitlab-ci-templateshttps://ops.cafe/notes/designing-security-workflows-using-gitlab-ci-templatesDesign and implementation of security templates that are reusable, easy to use and manage is easy using Gitlab's CI/CD template systemWed, 21 Feb 2024 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTgitlabdevsecopscybersecuritycicdDenis-Florin Rendlerhttps://ops.cafe/notes/docker-chronicles/hardening-docker-using-opa-harborhttps://ops.cafe/notes/docker-chronicles/hardening-docker-using-opa-harborTechnical implementation steps for my article on Securing Docker with OPA and HarborMon, 05 Feb 2024 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTdockeropaopenpolicyagentcontainersecurityDenis-Florin Rendlerhttps://ops.cafe/notes/docker-chronicles/security-through-minimalism-simple-configurationhttps://ops.cafe/notes/docker-chronicles/security-through-minimalism-simple-configurationDocker securityMon, 29 Jan 2024 00:00:00 GMTen-USThu, 23 Jul 2026 10:18:26 GMTdockersecurityDenis-Florin Rendler