System requirements

This page describes the system requirements for k0s.

Minimum memory and CPU requirements

The minimum requirements for k0s detailed below are approximations, and thus your results may vary.

Controller node recommendations

k0s has the standard Kubernetes limits for the maximum number of nodes, pods, etc. For more details, see the Kubernetes considerations for large clusters.

k0s controller node measured memory consumption can be found below on this page.

Storage

It's recommended to use an SSD for optimal storage performance (cluster latency and throughput are sensitive to storage).

The specific storage consumption for k0s is as follows:

Note: The operating system and application requirements must be considered in addition to the k0s part.

Host operating system

• Linux (see Linux specific requirements for details)
• Windows Server 2019

Architecture

• x86-64
• ARM64
• ARMv7

Networking

For information on the required ports and protocols, refer to networking.

External runtime dependencies

k0s strives to be as independent from the OS as possible. The current and past external runtime dependencies are documented here.

To run some automated compatiblility checks on your system, use k0s sysinfo.

Controller node measured memory consumption

The following table shows the measured memory consumption in the cluster of one controller node.

Measurement details:

• k0s v1.22.4+k0s.2 (default configuration with etcd)
• Ubuntu Server 20.04.3 LTS, OS part of the used memory was around 180 MB
• Hardware: AWS t3.xlarge (4 vCPUs, 16 GB RAM)
• Pod image: nginx:1.21.4