Originally posted by: apple08

dear aix guru,
do u configure yr clustered server running hacmp to use dns? is it best practise| hope to hear from you. thank u
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Originally posted by: apple08

dear sir,
wld like to get ur view on this useful article.
http://www.tek-tips.com/viewthread.cfm?qid=1464427&page=4

2. if its not advisable to configure dns on clustered servers, is dns is totally ignored or we need to register the physical ip of the clustered server only without the hacmp service ip and configure the clustered server as dns client.
sorry for my english. hope you can understand. hope to hear from u. thank u
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Originally posted by: CRM

HACMP clusters should not be reliant on DNS for any INTERNAL CLUSTER IP addresses, IP addresses outside of the cluster can be looked up using DNS.

The reason for this is that during a cluster failover you do not want to be waiting 30 seconds for DNS server timeouts.

When the cluster fails over, it will over-ride the /etc/netsvc.conf settings to set the cluster to use the local /etc/hosts file only.

Addresses outside of HACMP (e.g. applications etc) can be in DNS.

Boot, Service and Persistent (and maybe Standby but probably not any more) addresses should all be in /etc/hosts.

regards

Chris
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Originally posted by: apple08

dear sir,
thank you.
hope u will reply my questions.
meaning, we still need to configure the dns on clustered server. the physical ip where system admin access. if inside this server, can we configure etc/netsvc - hosts = local, bind and /etc/resolv.conf as normal. how to ensure our dns configuration will not impact the cluster configuration ?if we just configure normal dns on cluster server without register to dns admin all hacmp ip, do we need still test cluster fail over etc. hope to hear from you. thank you
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Originally posted by: CRM

You should configure DNS as normal, just note that during a failover PowerHA will disable the DNS and just use the local hosts file.

You should always test cluster failovers, initially do some full testing including pulling cables etc, and then some periodic failover testing to make sure that all is well in my opinion. A cluster is only as good at failing over as its last test.

As for the system admin IP address, if this is outside of HACMP control then just put this into DNS and configure your reolution order as bind, local as you would normally do.

regards

Chris
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Originally posted by: cd3lgado

Hi

given that DNS can be configured with a Primary and many Secondaries servers there's no sense on having a HACMP Cluster for DNS servers. Why you just configure a DNS Primary and several Secondaries on different servers even on different locations.

Hope this helps
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Originally posted by: apple08

dear sir,
i think what we would like to do is the implementation of dns on hacmp servers.
we have dns server, and we want to resgister our cluster server on our company dns server (windows server).
i've doubt over this thing:
1. for the standalone server is we know we need to register the server to dns server. how about clustered server (with hacmp).
2. if we configure the clustered server (with hacmp) as dns client, do we need to test the cluster again upon dns client configuration
3. i found this article that its not advisable to configure dns client on hacmp server as it reads frm /etc/hosts. appreciate yr advice. do u configure hacmp server as dns client server? http://www.tek-tips.com/viewthread.cfm?qid=1464427&page=4

hope to hear from you. thank you
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Originally posted by: tony.evans

HACMP doesn't rely on DNS.

Whether or not you additionally enable DNS on your servers depends on what you need to achieve and how you need to fit in with your environment.

Make sure /etc/hosts has all the HACMP labels and IP addresses, they are correct, and they match on all the nodes.

Once that's done, you can configure DNS if you need it, and don't if you don't need it.
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Originally posted by: apple08

dear aix guru,
currently the hacmp has been setup accordingly. but there is a req to resolve the server using hostname instead of ip address, with the expectation it could help during migration or relocation.
if we configure the dns on the clustered server, will it conflict with our hacmp configuration. what is the benefit of dns configuration if hacmp is not using it.

sir, do u register your hmc to dns? we r using hmc version 7-https, version 5 and 6.

hope to hear from you.
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Originally posted by: apple08

dear aix guru,
additional question:
if we configure dns on the cluster server, do we need to test cluster fail over. may god bless you. thank you
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Originally posted by: tony.evans

You appear to be asking the same question over and over.

It is for you to decide if you want to / need to add entries to DNS, and for what reason. You should follow the standard IT policy for where ever you are.

HACMP does not use DNS.
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Originally posted by: apple08

if we configure dns on the clustered server for other server connectivity, do we need to restest the cluster fail over? if we don't test, are we at risk? hope to hear from you
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