KubeZero - Zero Down Time Kubernetes platform

KubeZero is a Kubernetes distribution providing an integrated container platform so you can focus on your applications.

Design philosophy

Cloud provider agnostic, bare-metal/self-hosted
Focus on security and simplicity before feature bloat
No vendor lock in, most components are optional and could be exchanged
Organic Open Source / open and permissive licenses over closed-source solutions
No premium services / subscriptions required
Staying and contributing back to upstream projects as much as possible
Corgi approved 🐶

Architecture

Version / Support Matrix

KubeZero releases track the same minor version of Kubernetes.
Any 1.21.X-Y release of Kubezero supports any Kubernetes cluster 1.21.X.

KubeZero is distributed as a collection of versioned Helm charts, allowing custom upgrade schedules and module versions as needed.

%%{init: {'theme':'dark'}}%%
gantt
    title KubeZero Support Timeline
    dateFormat  YYYY-MM-DD
    section 1.22
    beta     :122b, 2022-05-01, 2022-06-01
    release  :after 122b, 2022-10-28
    section 1.23
    beta     :123b, 2022-08-01, 2022-10-01
    release  :after 123b, 2023-02-28
    section 1.24
    beta     :124b, 2022-12-01, 2022-12-31
    release  :after 124b, 2023-05-01

Upstream release policy

Components

OS

all nodes are based on Alpine V3.15
2 GB encrypted root filesystem
no 3rd party dependencies at boot ( other than container registries )
minimal attack surface
extremely small memory footprint / overhead

Container runtime

cri-o rather than Docker for improved security and performance

Control plane

all Kubernetes components compiled against Alpine OS using buildmode=pie
support for single node control plane for small clusters / test environments to reduce costs
access to control plane from within the VPC only by default ( VPN access required for Admin tasks )
controller nodes are used for various platform admin controllers / operators to reduce costs and noise on worker nodes

GitOps

cli / cmd line install
optional full ArgoCD support and integration
fuse device plugin support to build containers as part of a CI pipeline leveraging rootless podman build agents

AWS integrations

IAM roles for service accounts allowing each pod to assume individual IAM roles
access to meta-data services is blocked all workload containers on all nodes
all IAM roles are maintained via CloudBender automation
aws-node-termination handler integrated
support for spot instances per worker group incl. early draining etc.
support for Inf1 instances part of AWS Neuron.

Network

Multus support for multiple network interfaces per pod, eg. additional AWS CNI
Calico using VxLAN incl. increased MTU
allows flexible / more containers per worker node compared to eg. AWS VPC CNI
isolates container traffic from VPC by using VxLAN overlay
no restrictions on IP space / sizing from the underlying VPC architecture

Storage

flexible EBS support incl. zone awareness
EFS support via automated EFS provisioning for worker groups via CloudBender automation
local storage provider (OpenEBS LVM) for latency sensitive high performance workloads
CSI Snapshot controller and Gemini snapshot groups and retention

Ingress

AWS Network Loadbalancer and Istio Ingress controllers
no additional costs per exposed service
real client source IP available to workloads via HTTP header and access logs
ACME SSL Certificate handling via cert-manager incl. renewal etc.
support for TCP services
optional rate limiting support
optional full service mesh

Metrics

Prometheus support for all components
automated service discovery allowing instant access to common workload metrics
pre-configured Grafana dashboards and alerts
Alertmanager events via SNSAlertHub to Slack, Google, Matrix, etc.

Logging

all container logs are enhanced with Kubernetes and AWS metadata to provide context for each message
flexible ElasticSearch setup, leveraging the ECK operator, for easy maintenance & minimal admin knowledge required, incl. automated backups to S3
Kibana allowing easy search and dashboards for all logs, incl. pre configured index templates and index management
fluentd-concerter service providing queuing during highload as well as additional parsing options
lightweight fluent-bit agents on each node requiring minimal resources forwarding logs secure via TLS to fluentd-concenter

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