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DNS Resolution , BAD health issue

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I am facing a DNS resolution problem with 2 of my hosts in my cluster.

/etc/hosts file is configured like : ip FQDN hostname for all hosts

python -c "import socket; print socket.getfqdn(); print socket.gethostbyname(socket.getfqdn())"

gives me back the correct values ,

also i can ping each host with hostname normally

But still i cannot avoid this issue about DNS resolution .

Also the hosts IDs are different .

Any ideas pls ?

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