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Old 09-08-2010, 10:10 AM   #1 (permalink)
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Default Bas and DNS round robin

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hi

I have 2x bes 5.0.2 servers (all roles and also local sql 2008 server mirrored) in HA failover mode and all is working fine. I am running this as a VM on xenserver 5.6

I created a round robin DSN for the BAS console but as with some others I have got some issues accessing the BAS console using the RR DNS name.

i am currently still testing and when i take down one of the bes servers i cannot get access to the BAS via the RR DNS name.

it is driving me crazy and am wondering whether i am not better of just not bothering with BAS RR DNS and just logging to the BAS on the primary bes server and if that server is down to connect to bas on the backup bes server.

only a matter of changing 1 letter in the url.

or is it very important i use the BAS RR DNS method. if bes server 1 is down and i connect to bas console on bes server 2 any changes i make (which is not very often btw) will be written to the bes database (which could still be on the bes server 1 or 2 depending on which one is the active dbase and when bes 1 comes back up again i can use that console again? or am i missing something?

thanks
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Old 09-09-2010, 08:16 AM   #2 (permalink)
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I did not have success with the DNS round robin. I'm sure it has more to do with me being a dummy, but I'm living with running the BAS off of the server that is up.
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Old 09-09-2010, 11:24 AM   #3 (permalink)
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I have 2 instances, BES1a BES1b and BES2a BES2b. I also have a BES utility server that hosts BAS and Web Desktop Mgr.

Originally, I also tried the DNS round robin on the four BES HA servers with poor results. I've removed the round robin DNS entries and disabled BAS on the four HA servers. I now just run BAS on the utility server and it works great.

In the event my utility server goes down, I can just manually enable BAS on any of the four HA BES machines.
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Old 09-09-2010, 06:03 PM   #4 (permalink)
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Actually BAS is the web replacement for the former BlackBerry Manager.


In the good BES 4.1 days, my BES configuration is like this:-

Computer 1
-----------
Remote BlackBerry Manager

Computer 2
-----------
BES Core

Computer 3
------------
SQL 2000 SP4


Moving on the BES 5.0, my configuration is like this:-

Computer 1
-----------
BAS

Computer 2a
-----------
BES Core - Primary BES

Computer 2b
-----------
BES Core - Standby BES

Computer 3
------------
SQL 2005 SP3

I like to chart this picture, it's so much easier to explain!
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Old 09-10-2010, 07:23 AM   #5 (permalink)
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I had some issues with RR DNS but they were solved by using TCPPing instead of UDP.
Verify your BAS poolname under confg manager is exactly what you are using in your RR DNS entries.


BES 5.0 SP1 - KB19654-How to configure BlackBerry Administration Service High Availability nodes to communicate via TCPPING instead of UDP in BlackBerry Enterprise Server 5.0 SP1
BES 5.0 SP2 - KB17089-How to configure BlackBerry Administration Service High Availability nodes to communicate via TCPPING instead of UDP in BlackBerry Enterprise Server 5.0 SP2

Last edited by Claytonj25 : 09-10-2010 at 07:25 AM.
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Old 09-12-2010, 06:49 PM   #6 (permalink)
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Sometimes you need to turn off the client DNS caching. Because when one is down, it is still in the DNS cache for a while.

How to Disable Client-Side DNS Caching in Windows XP and Windows Server 2003

Regards,
Bob
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Old 09-12-2010, 06:59 PM   #7 (permalink)
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One thing you need to look at is the TTL for the DNS record.
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Old 09-14-2010, 08:13 AM   #8 (permalink)
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thanks changed the TTL to 1 minute and will test again, many thanks for all your responses
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Old 10-04-2010, 05:37 AM   #9 (permalink)
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btw the TTL change did the trick for me, now it works perfectly
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Old 10-07-2010, 08:48 AM   #10 (permalink)
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On the PC where I'm attempting to access the BAS, I did a ipconfig /flushdns and then ipconfig /registerdns

Worked great. BAS opens quickly and cleanly.
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