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clarify from feedback

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Tim Allclair 2018-06-28 16:54:04 -07:00
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keps/sig-node/0014-runtime-class.md
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@ -40,8 +40,7 @@ status: provisional
`RuntimeClass` is a new cluster-scoped resource that surfaces container runtime properties to the `RuntimeClass` is a new cluster-scoped resource that surfaces container runtime properties to the
control plane. RuntimeClasses are assigned to pods through a `runtimeClass` field on the control plane. RuntimeClasses are assigned to pods through a `runtimeClass` field on the
`PodSpec`. This provides a new mechanism for supporting multiple runtimes in the cluster and on the `PodSpec`. This provides a new mechanism for supporting multiple runtimes in a cluster and/or node.
nodes.
## Motivation ## Motivation
@ -107,7 +106,7 @@ iteration:
- As a cluster operator, I want to provide multiple runtime options to support a wide variety of - As a cluster operator, I want to provide multiple runtime options to support a wide variety of
workloads. Examples include native linux containers, "sandboxed" containers, and windows workloads. Examples include native linux containers, "sandboxed" containers, and windows
containers. containers.
- As a cluster operator, I want to provide stable rolling upgrades of nodes or runtimes. For - As a cluster operator, I want to provide stable rolling upgrades or runtimes. For
example, rolling out an update with backwards incompatible changes or previously unsupported example, rolling out an update with backwards incompatible changes or previously unsupported
features. features.
- As an application developer, I want to select the runtime that best fits my workload. - As an application developer, I want to select the runtime that best fits my workload.
@ -355,7 +354,7 @@ Beta:
limited to linux. As we build out Windows container support, we'll need to add windows-specific limited to linux. As we build out Windows container support, we'll need to add windows-specific
features as well. features as well.
- Host namespaces (Network,PID,IPC) may not be supported by virtualization-based runtimes - Host namespaces (Network,PID,IPC) may not be supported by virtualization-based runtimes
(e.g. Kata-containers & visor). (e.g. Kata-containers & gVisor).
- Per-pod and Per-container resource overhead varies by runtime. - Per-pod and Per-container resource overhead varies by runtime.
- Device support (e.g. GPUs) varies wildly by runtime & nodes. - Device support (e.g. GPUs) varies wildly by runtime & nodes.
- Supported volume types varies by node - it remains TBD whether this information belongs in - Supported volume types varies by node - it remains TBD whether this information belongs in