Docker tutorial - IT technology blog
Posted inDocker

Advanced Docker Swarm: Rolling Updates, Placement Constraints, and Zero-Downtime Deployments

A detailed guide to configuring Docker Swarm for production: zero-downtime Rolling Updates with order: start-first, Placement Constraints for proper workload distribution, and Docker Config/Secret for secure configuration management. Written for those who already know Swarm basics and want to level up to a real production environment without deployment downtime.
VMware tutorial - IT technology blog
Posted inVMware

Hot Add CPU and RAM on VMware vSphere: Upgrade Virtual Machine Resources Without Rebooting

Hot Add CPU and RAM on VMware vSphere lets you upgrade running virtual machine resources without shutting them down — but it must be enabled before the VM boots. This guide covers configuration via GUI, PowerCLI, and the .vmx file, plus a tip for enabling it in your VM template so you never face the "need more RAM but can't shut it down" situation.