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Fix outdated information about K3s

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Catherine Luse
2020-05-05 14:31:00 -07:00
parent 1f2341fef2
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content/k3s/latest/en/_index.md
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---
title: "K3s - 5 less than K8s"
title: "K3s - Lightweight Kubernetes"
shortTitle: K3s
name: "menu"
---
Lightweight Kubernetes. Easy to install, half the memory, all in a binary of less than 50mb.
Lightweight Kubernetes. Easy to install, half the memory, all in a binary of less than 100 MB.
Great for:
* Edge
* IoT
* CI
* Development
* ARM
* Embedding K8s
* Situations where a PhD in K8s clusterology is infeasible
# What is K3s?
K3s is a fully compliant Kubernetes distribution with the following enhancements:
* An embedded SQLite database has replaced etcd as the default datastore. External datastores such as PostgreSQL, MySQL, and etcd are also supported.
* Packaged as a single binary.
* Lightweight storage backend based on sqlite3 as the default storage mechanism. etcd3, MySQL, Postgres also still available.
* Wrapped in simple launcher that handles a lot of the complexity of TLS and options.
* Secure by default with reasonable defaults for lightweight environments.
* Simple but powerful "batteries-included" features have been added, such as: a local storage provider, a service load balancer, a Helm controller, and the Traefik ingress controller.
* Operation of all Kubernetes control plane components is encapsulated in a single binary and process. This allows K3s to automate and manage complex cluster operations like distributing certificates.
* In-tree cloud providers and storage plugins have been removed.
* External dependencies have been minimized (just a modern kernel and cgroup mounts needed). K3s packages required dependencies, including:
* containerd
* Flannel
* CoreDNS
* CNI
* Host utilities (iptables, socat, etc)
* Ingress controller (traefik)
* Embedded service loadbalancer
* Embedded network policy controller
# What's with the name?
We wanted an installation of Kubernetes that was half the size in terms of memory footprint. Kubernetes is a 10-letter word stylized as K8s. So something half as big as Kubernetes would be a 5-letter word stylized as K3s. There is no long form of K3s and no official pronunciation.