kubernetes and external DNS in ubuntu

It seems like FQDN is working fine with DNS but issue with the host system.

Can you try after changing the below entry in /etc/nsswitch.conf.

hosts:          files mdns4_minimal [NOTFOUND=return] dns

hosts:          files mdns4_minimal dns [NOTFOUND=return]

if above also not work then try putting only DNS.

hosts:          dns [NOTFOUND=return]

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