I want to increase the caching limit for traffic coming from within the cluster. for eg if from inside the nginx pod if I do dig to nginx-service then the TTL should be different and if I do dig to google.com then it must be different. Is there any possible way I can achieve this? Thanks in advance.
In the kubernetes plugin section of coreDNS Corefile you can set TTL to set a custom TTL for responses. The default is 5 seconds. The minimum TTL allowed is 0 seconds, and the maximum is capped at 3600 seconds. Setting TTL to 0 will prevent records from being cached.
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30 # Set this to anything between 0 to 3600
}
prometheus :9153
forward . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}