红帽全球峰会This documentation is for a release that is no longer maintained
See documentation for the latest supported version 3 or the latest supported version 4.第 13 章 OVN-Kubernetes default CNI network provider
The OpenShift Container Platform cluster uses a virtualized network for pod and service networks. The OVN-Kubernetes Container Network Interface (CNI) plug-in is a network provider for the default cluster network.
13.1.1. OVN-Kubernetes features
The OVN-Kubernetes default Container Network Interface (CNI) network provider implements the following features:
- Uses OVN (Open Virtual Network) to manage network traffic flows. OVN is a community developed, vendor agnostic network virtualization solution.
- Implements Kubernetes network policy support, including ingress and egress rules.
- Uses the Geneve (Generic Network Virtualization Encapsulation) protocol rather than VXLAN to create an overlay network between nodes.
OpenShift Container Platform offers two supported choices, OpenShift SDN and OVN-Kubernetes, for the default Container Network Interface (CNI) network provider. The following table summarizes the current feature support for both network providers:
| Feature | OVN-Kubernetes [1] | OpenShift SDN |
|---|---|---|
| Egress IPs | Not supported | Supported |
| Egress firewall [2] | Not supported | Supported |
| Egress router | Not supported | Supported |
| Kubernetes network policy | Supported | Partially supported [3] |
| Multicast | Supported | Supported |
- Available only as a Technology Preview feature in OpenShift Container Platform 4.5.
- Egress firewall is also known as egress network policy in OpenShift SDN. This is not the same as network policy egress.
-
Does not support egress rules and some
ipBlockrules.
13.1.3. Exposed metrics for OVN-Kubernetes
The OVN-Kubernetes default Container Network Interface (CNI) network provider exposes certain metrics for use by the Prometheus-based OpenShift Container Platform cluster monitoring stack.
| Name | Description |
|---|---|
|
| The latency between when a pod is created and when the pod is annotated by OVN-Kubernetes. The higher the latency, the more time that elapses before a pod is available for network connectivity. |
Additional resources
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