Virtualization tutorial - IT technology blog
Posted inVirtualization

QEMU Monitor Console and QMP Protocol: Control, Debug, and Inject Errors into KVM VMs from the Hypervisor Layer

QEMU Monitor Console and QMP Protocol allow you to control KVM virtual machines directly from the hypervisor layer without SSH-ing into the guest OS. This guide covers connecting to the monitor, using QMP with Python for automation, and practical debugging techniques such as memory dumps, disk error injection, and network packet capture.
Security tutorial - IT technology blog
Posted inSecurity

Cert-Manager on Kubernetes: Automate TLS Provisioning and Renewal with Let’s Encrypt — Never Worry About Expired Certificates Again

cert-manager runs inside your Kubernetes cluster and fully automates the entire certificate lifecycle — from initial provisioning to renewal — without any manual intervention. It supports both HTTP-01 and DNS-01 challenges, making it suitable for public Ingresses and internal services that aren't exposed to the internet. This guide walks through installation, ClusterIssuer configuration, wildcard cert setup with Cloudflare DNS, and practical tips from real production experience.