ping can resolve hostname, while dig is unable to resolve the same hostname?

>ping can resolve hostname, while dig is unable to resolve the same hostname? I'm experiencing a strange issue, where ping is able to resolve some DNS hostname, while dig cannot. I've tried to dig +search to use the search entries in /etc/resolv.conf, or dig @ to set the nameserver explicitly, but that didn't help. How can I understand why ping resolves the hostnames, while dig is unable? kube@ctf-k8s-deploy-647d66b697-lxqkl:~$ cat /etc/resolv.conf nameserver 100.64.0.10 search default.svc.cluster.local svc.cluster.local cluster.local eu-central-1.compute.internal options ndots:5 kube@ctf-k8s-deploy-647d66b697-lxqkl:~$ dig +search ctf-k8s-deploy-647d66b697-lxqkl ; > DiG 9.11.5-P4-5.1-Debian > +search ctf-k8s-deploy-647d66b697-lxqkl ;; global options: +cmd ;; Got answer: ;; ->>HEADER> DiG 9.11.5-P4-5.1-Debian > @100.64.0.10 +search ctf-k8s-deploy-647d66b697-lxqkl ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 47568 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;ctf-k8s-deploy-647d66b697-lxqkl. IN A ;; Query time: 0 msec ;; SERVER: 100.64.0.10#53(100.64.0.10) ;; WHEN: Mon Mar 23 14:46:53 UTC 2020 ;; MSG SIZE rcvd: 60 kube@ctf-k8s-deploy-647d66b697-lxqkl:~$ ping ctf-k8s-deploy-647d66b697-lxqkl PING ctf-k8s-deploy-647d66b697-lxqkl (100.96.1.8) 56(84) bytes of data. 64 bytes from ctf-k8s-deploy-647d66b697-lxqkl (100.96.1.8): icmp_seq=1 ttl=64 time=0.019 ms 64 bytes from ctf-k8s-deploy-647d66b697-lxqkl (100.96.1.8): icmp_seq=2 ttl=64 time=0.019 ms 64 bytes from ctf-k8s-deploy-647d66b697-lxqkl (100.96.1.8): icmp_seq=3 ttl=64 time=0.021 ms ^C --- ctf-k8s-deploy-647d66b697-lxqkl ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 40ms rtt min/avg/max/mdev = 0.019/0.019/0.021/0.005 ms **Update**: /etc/hosts: kube@ctf1-deploy1-89b48b46-zkqld:~$ cat /etc/hosts # Kubernetes-managed hosts file. 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet fe00::0 ip6-mcastprefix fe00::1 ip6-allnodes fe00::2 ip6-allrouters 100.96.3.22 ctf1-deploy1-89b48b46-zkqld /etc/resolv.conf: kube@ctf1-deploy1-89b48b46-zkqld:~$ cat /etc/resolv.conf nameserver 100.64.0.10 search ctf1-ns.svc.cluster.local svc.cluster.local cluster.local eu-central-1.compute.internal options ndots:5