All disks are not equal, especially cheap consumer disks without temperature sensors (a.k.a HP DL380 G7 fan speeds running like a 747 on take off)

I’ve recently been enjoying the freedom of a homelab, creating VMs on VMware ESXi and installing all-the-things. I’ve had my HP Proliant DL380 G7 for a couple of weeks now and already accumulated a number of VMs for investigating a collection of things: 3x CentOS7 VMs running a Kubernetes cluster with a master and 2 …

Error starting Openshift Origin on CentOS 7: systemd cgroup driver vs cgroupfs driver

Following the instructions to install the Openshift Origin binary from here,  on first attempt to start it up I got this error: failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: “systemd” is different from docker cgroup driver: “cgroupfs” Per instructions in this issue ticket, to verify which cgroup drivers docker is …

Building a multi-container Spring Boot and MongoDB webapp with Docker 1.12.x

I’ve spent a bunch of time playing with apps in single containers up until now and reached the point where I started to think about questions like: “ok, so how is this done if you have an application with multiple services, where you may need to scale individual services but not others?” and “how does an …