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From Sumit Mohanty <smoha...@hortonworks.com>
Subject Re: Component placement strategy - Ambari
Date Fri, 18 Sep 2015 23:18:56 GMT
I may not have fully understood this question.


Ambari does not maintain a mapping between FQDN and IP address. It relies on the mapping to
be available via external means (say /etc/hosts).

Ambari will use the FQDN as host id/name while producing config values. Say HDFS or HBASE
needs ZK quorum. Ambari will set the quorum using the hostnames (e.g. FQDN by default) it
obtained from the agents running on the host.

________________________________
From: Vijaya Narayana Reddy Bhoomi Reddy <vijaya.bhoomireddy@whishworks.com>
Sent: Friday, September 18, 2015 3:27 PM
To: user@ambari.apache.org
Subject: Re: Component placement strategy - Ambari


Thats true that we would provide FQDNs in Ambari. However, if the underlying machines' IP
addresses change due to DHCP, how would FQDNs resolve to the new IPs? Or is it always recommended
to have static IPs mapped to FQDNs and mentioned in the /etc/hosts on each machine in the
cluster?

Regards
Vijay


On 18 Sep 2015, at 18:17, Sumit Mohanty <smohanty@hortonworks.com<mailto:smohanty@hortonworks.com>>
wrote:

Ambari uses FQDN and also uses FQDN for configuration values as well.



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