Kubernetes cluster compute requirements

Minimum Requirements

A minimal cluster, with no redundancy requires the following:

Any flavour of Kubernetes pre-installed (Vanilla Kubernetes, RedHat OpenShift, Rancher etc) installed on Ubuntu or Redhat on Physical hardware or a VM
48 Cores
64GB RAM
200GB disk space
Either 1TB local storage or 1TB NFS storage via a CSI (or if pre-configured PV’s, see below).

Recommended Setup

A production cluster should have 3 master nodes and 2-3 worker nodes.

Any flavour of Kubernetes is supported (Vanilla Kubernetes, RedHat OpenShift, Rancher etc) installed on Ubuntu or Redhat on Physical hardware or a VM.

You can use a pre-existing cluster, MetalSoft doesn’t need a dedicated cluster as long as the requirements are met.

Kubernetes Node requirements

Master nodes

4 Cores
8GB RAM
200GB disk space

Worker nodes

16 Cores
32GB RAM
200GB disk space
1TB NFS storage via a CSI (or if pre-configured PV’s, see below)

Storage Requirements

Storage is the most important bottleneck for scaling MetalSoft. Both disk space and sufficient performance is required for a successful deployment.

Storage space requirements

Support for persistent volumes with a minimum of 1TB of disk space is required either via a CSI or with the following pre-configured PVs:

image builder ISO storage 800GB RWM (read-write-many) both image builder and ms-tunnel server use this volume
controller-pvc 5Gb RWX
mysql-pvc 100Gb RWX
redis-pvc 10Gb RWX
repo-pvc 10Gb RWX
other microservices 10Gb RWX

Storage performance requirements

The storage must also allow for ReadWriteMany access mode and have CSI driver/provisioner available for it (ex. NFS with NFS Subdir External Provisioner). This will allow the image builder volume to be mounted by multiple image-builder pods.

Reference performance numbers:

4k Random Read : 1000 IOPs, 4MB/s
4k Random Write: 500 IOPs, 2MB/s