ExternalNameServiceTypeInvalidPortName
This message occurs for services of type ExternalName when the port doesn’t follow Istio service port naming convention, the port is unnamed or the port is named tcp.
Example
You will receive this message:
Warning [IST0150] (Service nginx.default) Port name for ExternalName service is invalid. Proxy may prevent tcp named ports and unmatched traffic for ports serving TCP protocol from being forwarded correctly.
when your cluster has the following service:
apiVersion: v1
kind: Service
metadata:
name: nginx
spec:
externalName: nginx.example.com
ports:
- name: tcp
port: 443
protocol: TCP
targetPort: 443
type: ExternalName
In this example, the port name tcp
follows the syntax: name: <protocol>
. However, for ExternalName services, there is no service IP defined, so the SNI field is needed for routing.
How to resolve
- If you have an ExternalName service type, and the protocol is TCP, rename the port to
<protocol>[-<suffix>]
or<protocol>
where protocol ishttps
ortls
. To learn more, review docs on explicit protocol selection.