Warning: mysqli::mysqli(): php_network_getaddresses: getaddrinfo failed: Name or service not known

Question

Warning: mysqli::mysqli(): php_network_getaddresses: getaddrinfo failed: Name or service not known

in - on line 22
Warning: mysqli::mysqli(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 22
Warning: mysqli::mysqli(): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 22
Warning: mysqli::mysqli(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 22
MySQL Connection Error: (2002) php_network_getaddresses: getaddrinfo failed: Name or service not known
Warning: mysqli::mysqli(): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 22
Warning: mysqli::mysqli(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 22
MySQL Connection Error: (2002) php_network_getaddresses: getaddrinfo failed: Name or service not known

$ kubectl exec -ti dnsutils -- cat /etc/resolv.conf
nameserver 172.20.0.10
search default.svc.cluster.local svc.cluster.local cluster.local us-west-1.compute.internal
options ndots:5

$ kubectl exec -i -t dnsutils -- nslookup kubernetes.default
Server: 172.20.0.10
Address: 172.20.0.10#53

Name: kubernetes.default.svc.cluster.local
Address: 172.20.0.1

$ kubectl get pods --namespace=kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
coredns-556765db45-2rtwm 1/1 Running 0 38m
coredns-556765db45-gh5bp 1/1 Running 0 38m

$ kubectl get svc --namespace=kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 172.20.0.10 <none> 53/UDP,53/TCP 38m
metrics-server ClusterIP 172.20.219.130 <none> 443/TCP 32m

Не могу решить проблему...
Развернул для теста WordPress. Не видит базу. Какая-то проблема с резолвом имени. Проверил DNS - вроде крутится и нет ошибок.

Кластер на AWS EKS

Куда смотреть ?