Configuration Tips

This document refers to some data sources, conventions and rules while configuring a connection hub.

Naming Instances

It's obligatory to use cluster domain names while naming instances. To learn cluster domain name, you can run:

kubectl get cm coredns -n kube-system -o jsonpath="{.data.Corefile}" \
  | grep ".local " \
  | awk -F ' ' '{print $2}'

Sample output will be:

cluster-one.local

It means that YOU MUST name that instance as cluster-one.

Finding Cluster CIDR of Instance

It can be queried using:

kubectl get nodes <NODE-NAME> -o jsonpath='{.spec.podCIDR}'

Finding Service CIDR of Instance

It can be queried using:

SVCRANGE=$(echo '{"apiVersion":"v1","kind":"Service","metadata":{"name":"tst"},"spec":{"clusterIP":"1.1.1.1","ports":[{"port":443}]}}' | kubectl apply -f - 2>&1 | sed 's/.*valid IPs is //')
echo $SVCRANGE