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Darren Shepherd 2020-04-24 14:21:08 -07:00 committed by Craig Jellick
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k3s - 5 less than k8s
k3s - Lightweight Kubernetes
===============================================
Lightweight Kubernetes. Easy to install, half the memory, all in a binary less than 40mb.
Lightweight Kubernetes. Easy to install, half the memory, all in a binary less than 100 MB.
Great for:
* Edge
* IoT
* CI
* Development
* ARM
* Embeddeding k8s
* Situations where a PhD in k8s clusterology is infeasible
What is this?
---
k3s is intended to be a fully compliant Kubernetes distribution with the following changes:
k3s is a fully compliant Kubernetes distribution with the following changes:
1. Removed most in-tree plugins (cloud providers and storage plugins) which can be replaced
with out of tree addons.
2. Add sqlite3 as the default storage mechanism. etcd3 is still available, but not the default.
3. Wrapped in simple launcher that handles a lot of the complexity of TLS and options.
4. Minimal to no OS dependencies (just a sane kernel and cgroup mounts needed). k3s packages required
1. Packaged as a single binary
1. Lightweight storage backend based on sqlite3 as the default storage mechanism. etcd3, MySQL, Postgres also still available.
1. Wrapped in simple launcher that handles a lot of the complexity of TLS and options.
1. Secure by default with reasonable defaults for lightweight environments.
1. Minimal to no OS dependencies (just a sane kernel and cgroup mounts needed). k3s packages required
dependencies
* 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.
Documentation
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