High-availability Kubernetes Support

[drew]

Create an officially supported Helm chart for deploying Kubernetes onto existing Kubernetes infrastructure. Ensure Kubernetes deployments are suitable for enterprise deployments. Establish a plan for making OpenShell components ready for enterprise.

Overview

• Helm Chart
  • Publish as OCI resource on ghcr.io
  • Provide Ingress to OpenShell Gateway via Kubernetes Gateway API
• Control Plane Authnz (keycloak to start)
• High Availability Gateway
  • Supports horizontal scaling, rollouts, and client connection rebalancing
• Configuring Sandboxes
  • Specify memory, cpu, and other pod specs.
  • Reduce need for privileged security capabilities (eg no more CAP_NET_ADMIN)
  • OpenShell supervisor is injected onto the container via image volumes.
• Observability (includes both gateway and sandbox health)
  • Logs exporting
  • Metrics (Prometheus, already landed)
  • Dashboards (Grafana/similar)
• Resiliency
  • Sandboxes are resilient to network disconnection between supervisor and openshell-server for Y period of time.
  • Clarify heartbeat of supervisor to openshell-server, possibly some jitter in case of thundering herd scenarios.
• Upgrading OpenShell
  • Gateway data/schemas are migrated as necessary on upgrades
  • Sandbox containers can be rolled with a new version of the supervisor
  • Sandbox containers themselves can be updated
• Unified gateway configuration file (see RFC 0002 - Gateway Configuration File)
• Kubernetes Operator
• We need a way to develop and test k8s features locally.
  • K3s + skaffold or tilt or some other dev script
• Test infrastructure

Milestones

M1 - mvp

• Helm Chart
• Developer loop
• OpenShell server accepts a kube config and is decoupled from any k3s
• Documentation w/ rbac details for running inside an existing kube cluster
• parameterize e2e tests to point to any cluster
• Unified gateway config
• Initial documentation and deployment guidance available

M2 - reliability

• Test coverage on OpenShift and major Kubernetes distributions
• Security context privileges are dropped.
  • Implement runtime class configs: kata and gvisor
• Gateway can horizontally scale
• Agent and operator friendly observability (gateway and sandbox)

M3 - operating OpenShell at scale

• OpenShell Kubernetes Operator
• Support upgrading/snapshotting sandboxes