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KubeZero - Zero Down Time Kubernetes platform
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KubeZero is a Kubernetes distribution providing an integrated container platform so you can focus on your applications.
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# Design philosophy
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- Cloud provider agnostic, bare-metal/self-hosted
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- No vendor lock in, most components are optional and could be exchanged
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- Organic Open Source / open and permissive licenses over closed-source solutions
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- No premium services / subscriptions required
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- Staying and contributing back to upstream projects as much as possible
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- Corgi approved :dog:
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# Architecture
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# Version / Support Matrix
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KubeZero releases track the same *minor* version of Kubernetes.
Any 1.20.X-Y release of Kubezero supports any Kubernetes cluster 1.20.X.
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KubeZero is distributed as a collection of versioned Helm charts, allowing custom upgrade schedules and module versions as needed.
| KubeZero Version | Kubernetes Version | EOL |
|------------------|---------------------|-------------|
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| v1.21.0-alpha | v1.21 | 28 Feb 2022 |
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| v1.20.8 | v1.20 | 30 Nov 2021 |
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| v1.19 | v1.19 | Jul 2021 |
| v1.18 | v1.18 | Apr 2021 |
| v1.17 | v1.17 | Jan 2021 |
| v1.16 | v1.16 | Nov 2020 |
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[Upstream release policy ](https://kubernetes.io/releases/ )
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# Components
## Container runtime
- cri-o rather than Docker for improved security and performance
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## Control plane
- 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
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## GitOps
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- cli / cmd line install
- optional full ArgoCD support and integration
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## 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
- system IAM roles are maintained via CloudBender automation
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## Network
- Calico using VxLAN incl. increased MTU
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- allows flexible / more containers per worker node compated to eg. AWS VPC CNI
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- isolates container traffic from VPC by using VxLAN overlay
- no restrictions on IP space / sizing from the underlying VPC architecture
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## Storage
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- flexible EBS support incl. zone awareness
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- EFS support via automated EFS provisioning for worker groups via CloudBender automation
- local storage provider (OpenEBS LVM) for latency sensitive high performance workloads
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## Ingress
- AWS Network Loadbalancer and Istio Ingress controllers
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- optional rate limiting support
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- No additional costs per exposed service
- Automated SSL Certificate handling via cert-manager incl. renewal etc.
- support for TCP services
- Client source IP available to workloads via HTTP header
- optional full service mesh
## Metrics
- Prometheus support for all components
- automated service discovery allowing instant access to common workload metrics
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- pre-configured Grafana dashboards and alerts
- Alertmanager events via SNSAlertHub to Slack, Google, Matrix, etc.
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## Logging
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- all container logs are enhanced with Kubernetes and AWS metadata to provide context for each message
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- 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
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- [fluentd-concerter ](https://git.zero-downtime.net/ZeroDownTime/container-park/src/branch/master/fluentd-concenter ) 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
