From: Raj Atwal (atwalrs@YAHOO.COM)
Date: Wed Jul 30 2003 - 10:34:16 EDT
Fair enough point about forgetting to make changes to both environments. We have just made it an admin responsibility and procedure that the hosts file must have all AIX servers defined in it.
We have found in our testing that if DNS is down it takes a while before it fails over and resolves to the secondary server, and because all our mission critical apps are on the SP or on AIX servers we need to use local resolution first. That way we have no real dependency for our applications if DNS is down.
I guess you have to make a choice for netsvc.conf that is applicable to the environment that you are working in. As I said for us and our applications we find it more efficient to use local before bind.
cheers
Raj Atwal
"Green, Simon" <Simon.Green@EU.ALTRIA.COM> wrote:
Regarding netsvc.conf, I'm in two minds.
If one is going to use DNS, then surely it makes sense to _use_ it and use "bind,local". Otherwise, if you omit to make a change in /etc/hosts as well as DNS you could go badly awry.
If I really can cut /etc/hosts down to the bone that's not very likely to be a problem, but we'll still have six distinct SP2s at the moment and over 100 nodes, in a fairly fluid environment. (We're doing a lot of consolidation at the moment, so we keep moving things around and setting up temporary staging systems etc.)
Simon Green
Altria ITSC Europe Ltd
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will not be appreciated.
-----Original Message-----
From: Raj Atwal [mailto:atwalrs@YAHOO.COM]
Sent: 30 July 2003 14:47
To: aix-l@Princeton.EDU
Subject: Re: Implementing DNS on SP2
Thats pretty much the way I have done it with my SP customers. I keep a minimal /etc/hosts file which contains just AIX servers, and use DNS for stuff like NT and file/print servers. Besides removing your adminstrative overhead of maintaining the hosts file, another advantage I see is that you probably have a secondary DNS server out there in your network and therefore have some redundancy - which is never a bad thing :)
Oh, and I'm sure you know this Simon but just in case, dont forget to set up you /etc/netsvc.conf file to use local before bind, or use NSORDER variable.
Rgds
Raj Atwal
"Green, Simon" <Simon.Green@EU.ALTRIA.COM> wrote:
What I would like to do is just have all of the AIX IP addresses in
/etc/hosts - which would include some HACMP stuff - but ditch all the NT
print servers, AS/400s etc.
Simon Green
Altria ITSC Europe Ltd
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will not be appreciated.
> -----Original Message-----
> From: Ferenc Gyurcsan [mailto:fgyurcsa@AVAILANT.COM]
> Sent: 30 July 2003 14:06
> To: aix-l@Princeton.EDU
> Subject: Re: Implementing DNS on SP2
>
>
> If you use HACMP, you will have to maintain the HACMP addresses in
> /etc/hosts.
> I would still maintain a minimal /etc/hosts, so that if the
> DNS is down, you
> still don't have to remember a bunch of critical IP addresses.
> --Ferenc
>
> -----Original Message-----
> From: Green, Simon [mailto:Simon.Green@EU.ALTRIA.COM]
> Sent: Wednesday, July 30, 2003 9:00 AM
> To: aix-l@Princeton.EDU
> Subject: Implementing DNS on SP2
>
>
> At the moment, most of our AIX boxes (nearly all of which are
> SP2 nodes, but
> a few are standalone), just use /etc/hosts for name
> resolution. We are
> considering moving to DNS. (There are a couple of AIX boxes
> which use DNS,
> plus all the PC network, so we're not talking about setting up new DNS
> servers.)
>
> I've read through the manuals to refresh my memory, including the IBM
> document on DNS for SP2, and it all looks pretty straight forward.
>
> Are there likely to be any unexpected pitfalls?
>
> Do those of you using DNS have a very small, fairly static
> /etc/hosts file
> or do you continue ! to maintain it as before?
>
> We haven't yet made up our minds whether to do this. What
> reasons can you
> think of for and against, besides removing the administrative
> overhead of
> maintaining /etc/hosts?
>
> Thanks,
> Simon Green
> Altria ITSC Europe Ltd
>
> AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
> AIX FAQ at http://www.faqs.org/faqs/aix-faq/
>
> N.B. Unsolicited email from vendors will not be appreciated.
>
---------------------------------
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
---------------------------------
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 22:17:04 EDT