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K3s, which is only the size of 40MB, provides a good choice for enterprises that want to save money for development and testing. This article will teach you how to deploy lightweight Kubernetes clusters using K3s in 5 minutes in a very concise way.

This article is from: Rancher Labs

Kubernetes has changed how containerized workloads are deployed and managed on a large scale. The main challenge facing developers now lies in the complexity of the setup process and the huge demand for resources. If you are suffering from insufficient memory and want to deploy lightweight Kubernetes clusters to reduce memory footprint, be sure to consider K3s, a lightweight Kubernetes distribution released by Rancher Labs. It packages all the files needed to install Kubernetes into a 40MB-sized binary file, which only needs 512MB's RAM to run. It is very suitable for environments with limited resources, such as edge computing scenarios, IoT and so on.

In the actual scenario, in order to gain the motivation of development and testing and save money, users want to be able to deploy Kubernetes with the least resource utilization and lower hardware specifications. K3s meets this requirement by running clusters on any device above 512MB RAM, such as IoT devices or ARM-driven devices.

Since K3s requires only a few resources to run, this means that some Kubernetes features have been removed:

Old, non-default, alpha function

Most in-tree plug-ins (cloud providers and storage plug-ins), which are replaced with add-ons

Use sqlite instead of etcd as the default storage mechanism

Deploy lightweight K8s cluster using K3s in 5 minutes

In this article, I'll use three server running on Debian 10, each with 1GB's RAM and 1vcpu. One of the server is the master and the other two are the worker nodes.

$openstack server list+--+--+- +-+ | ID | Name | Status | Networks | Image | Flavor | +-- -+ | 4df6a6dc-26e8-4ae0-8b6e-2f97daec0ef3 | k3s-master | ACTIVE | private=10.10.1.159 | Debian-10 | m1.tiny | | 5ca13239-b745-4f62 -ab11-0a27949c9b35 | k3s-node02 | ACTIVE | private=10.10.1.142 | Debian-10 | m1.tiny | | a54997f2-4d94-4718-86ab-73609b328761 | k3s-node01 | ACTIVE | private=10.10.1.126 | Debian-10 | m1.tiny | +-+ -+

I will add A record to the server in the / etc / hosts file for each server.

Sudo tee-a / etc/hosts

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