第 2 章 Understanding networking settings
Learn how to apply networking customization and default settings to MicroShift deployments. Each node is contained to a single machine and single MicroShift, so each deployment requires individual configuration, pods, and settings.
Cluster Administrators have several options for exposing applications that run inside a cluster to external traffic and securing network connections:
- A service such as NodePort
-
API resources, such as
IngressandRoute
By default, Kubernetes allocates each pod an internal IP address for applications running within the pod. Pods and their containers can have traffic between them, but clients outside the cluster do not have direct network access to pods except when exposed with a service such as NodePort.
To troubleshoot connection problems with the NodePort service, read about the known issue in the Release Notes.
2.1. Creating an OVN-Kubernetes configuration file
MicroShift uses built-in default OVN-Kubernetes values if an OVN-Kubernetes configuration file is not created. You can write an OVN-Kubernetes configuration file to /etc/microshift/ovn.yaml. An example file is provided for your configuration.
Procedure
To create your
ovn.yamlfile, run the following command:$ sudo cp /etc/microshift/ovn.yaml.default /etc/microshift/ovn.yamlTo list the contents of the configuration file you created, run the following command:
$ cat /etc/microshift/ovn.yaml.defaultExample YAML file with default maximum transmission unit (MTU) value
mtu: 1400To customize your configuration, you can change the MTU value. The table that follows provides details:
Expand 表 2.1. Supported optional OVN-Kubernetes configurations for MicroShift Field Type Default Description Example mtu
uint32
auto
MTU value used for the pods
1300
重要If you change the
mtuconfiguration value in theovn.yamlfile, you must restart the host that Red Hat build of MicroShift is running on to apply the updated setting.Example custom
ovn.yamlconfiguration filemtu: 1300
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