Kubernetes: Pods Can't Resolve Hostnames

Question

I am encountering an issue with Kubernetes where my pods cannot resolve hostnames (such as google.com or kubernetes.default).

I currently have

Answer 1

Check coredns pods log, if you see errors like:

# kubectl logs --namespace=kube-system coredns-XXX
  ...
  [ERROR] plugin/errors ... HINFO: read udp ... read: no route to host

Then make sure firewalld masquerade is enabled on the host:

# firewall-cmd --list-all
  ... 
  masquerade: yes

Enable if it's "no":
# firewall-cmd --add-masquerade --permanent
# firewall-cmd --reload

*You may need to restart/reboot after this