Use Regex to Get Specific Data in Deployment Configs

Itacen Sabacok | Oct 1, 2022 
1kubectl get configmap kafka-default-config -o yaml | grep -oP '(replication[fF]actor[:|=].\d{0,4})'
2> OUTPUT: replicationFactor=3

1kubectl get ingress nginx -n test -o yaml | grep apiVersion:
2> OUTPUT: apiVersion: networking.k8s.io/v1


You can automatize like below which helps you to find for all of your resources

 1!/bin/bash
 2# resource can be configmaps, deployments, pods, ingress etc.
 3resource=configmaps
 4ns=default
 5resourceNames=( $(kubectl get $resource -n $ns | awk 'NR!=1 {print $1}') )
 6ind=1
 7for i in "${resourceNames[@]}"
 8do
 9	echo "$ind --> fetching $i"
10	kubectl get $resource $i -n $ns -o yaml | grep -oP '(replication[fF]actor[:|=].\d{0,4})'
11	echo ""
12	((ind+=1))
13done