topic Re: DNS ServiceGuard in Operating System - Linux

DNS ServiceGuard

Vladimir Coca — Wed, 15 Jun 2005 06:45:49 GMT

Is it mandatory to configure and have a DNS installing ServiceGuard?

Re: DNS ServiceGuard

Steven E. Protter — Wed, 15 Jun 2005 07:02:03 GMT

No.

It is not mandatory. SG will work quite nicely with only /etc/hosts networking.

It is quite useful however.

SEP

Re: DNS ServiceGuard

Vladimir Coca — Wed, 15 Jun 2005 07:23:17 GMT

Thanks,

And so, if it's not necessary, why I can't resolve any IP (it's atwo node cluster)?

May I force the nodes to /etc/hosts file?

Telnet, SSH, ping works with the file, but don't host or any ServiceGuard command...

I have /etc/cmclnodelist configured as

node1 root
node2 root
+

Some questions..

Must cmcluster service be running?

No firewall runnig, all the ports OK...

What I doing wrong?
I'll go crazy...

Thanks

Re: DNS ServiceGuard

Stuart Browne — Wed, 15 Jun 2005 07:27:01 GMT

This is very much sounding like standard resolver information.

You have a few simple choices..

1) Use a DNS server which is correctly populated.

2) Populate the '/etc/hosts' files on all associated nodes with the correct information.

So basically, populate the '/etc/hosts' files with the IP and hostnames of all your nodes, distributed to all nodes, and you should be alright.

All Network daemons should use the hosts file assuming the '/etc/nsswitch.conf' has the line:

hosts: files dns

This tells your resolver to look at the '/etc/hosts' file before looking at the DNS server.

Re: DNS ServiceGuard

Steven E. Protter — Wed, 15 Jun 2005 07:34:54 GMT

That would make it a networking problem.

check /etc/hosts

make sure for host resolution, files comes before dns.

Then make sure the /etc/hosts database has good data in it.

Also, SG is very finicky that every configured network interface be pingable.

SEP