mirror of https://github.com/k3s-io/k3s
66 lines
4.4 KiB
Markdown
66 lines
4.4 KiB
Markdown
# Kubernetes Roadmap
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Updated August 28, 2014
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This document is intended to capture the set of features, docs, and patterns that we feel are required to call Kubernetes “feature complete” for a 1.0 release candidate. This list does not emphasize the bug fixes and stabilization that will be required to take it all the way to production ready. This is a living document, and is certainly open for discussion.
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## APIs
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1. ~~Versioned APIs: Manage APIs for master components and kubelets with explicit versions, version-specific conversion routines, and component-to-component version checking.~~ **Done**
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2. Component-centric APIs: Clarify which types belong in each component’s API and which ones are truly common.
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1. Clarify the role of etcd in the cluster.
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3. Idempotency: Whenever possible APIs must be idempotent.
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4. Container restart policy: Policy for each pod or container stating whether and when it should be restarted upon termination.
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5. Life cycle events/hooks and notifications: Notify containers about what is happening to them.
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6. Re-think the network parts of the API: Find resolution on the the multiple issues around networking.
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1. ~~Utility of HostPorts in ip-per-pod~~ **Done**
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2. Services/Links/Portals/Ambassadors
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7. Durable volumes: Provide a model for data that survives some kinds of outages.
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8. Auth[nz] and ACLs: Have a plan for how the API and system will express:
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1. Identity & authentication
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2. Authorization & access control
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3. Cluster subdivision, accounting, & isolation
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## Factoring and pluggability
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1. ~~Pluggable scheduling: Cleanly separate the scheduler from the apiserver.~~ **Done**
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2. Pluggable naming and discovery: Call-outs or hooks to enable external naming systems.
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3. Pluggable volumes: Allow new kinds of data sources as volumes.
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4. Replication controller: Make replication controller a standalone entity in the master stack.
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5. Pod templates: Proposal to make pod templates a first-class API object, rather than an artifact of replica controller
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## Cluster features
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1. ~~Minion death: Cleanly handle the loss of a minion.~~ **Done**
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2. Configure DNS: Provide DNS service for k8s running pods, containers and services. Auto-populate it with the things we know.
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3. Resource requirements and scheduling: Use knowledge of resources available and resources required to do better scheduling.
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4. ~~True IP-per-pod: Get rid of last remnants of shared port spaces for pods.~~ **Done**
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5. IP-per-service: Proposal to make services cleaner.
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6. Basic deployment tools: This includes tools for higher-level deployments configs.
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7. Standard mechanisms for deploying k8s on k8s with a clear strategy for reusing the infrastructure for self-host.
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## Node features
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1. Container termination reasons: Capture and report exit codes and other termination reasons.
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2. Garbage collect old container images: Clean up old docker images that consume local disk. Maybe a TTL on images.
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3. Container logs: Expose stdout/stderr from containers without users having to SSH into minions. Needs a rotation policy to avoid disks getting filled.
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4. Container performance information: Capture and report performance data for each container.
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5. Host log management: Make sure we don't kill nodes with full disks.
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## Global features
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2. Input validation: Stop bad input as early as possible.
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3. Error propagation: Report problems reliably and consistently.
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4. Consistent patterns of usage of IDs and names throughout the system.
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5. Binary release: Repeatable process to produce binaries for release.
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## Patterns, policies, and specifications
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1. Deprecation policy: Declare the project’s intentions with regards to expiring and removing features and interfaces.
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2. Compatibility policy: Declare the project’s intentions with regards to saved state and live upgrades of components.
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3. Naming/discovery: Demonstrate techniques for common patterns:
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1. Master-elected services
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2. DB replicas
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3. Sharded services
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4. Worker pools
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4. Health-checking: Specification for how it works and best practices.
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5. Logging: Demonstrate setting up log collection.
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6. ~~Monitoring: Demonstrate setting up cluster monitoring.~~ **Done**
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7. Rolling updates: Demo and best practices for live application upgrades.
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1. Have a plan for how higher level deployment / update concepts should / should not fit into Kubernetes
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8. Minion requirements: Document the requirements and integrations between kubelet and minion machine environments.
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