Powershell : Checking DNS alias

Hi,
We have 2 servers, one production and one back-up. With a DNS alias everyone connects to the production server. When the backup server becomes operational we just need to change the DNS alias.
Now, I need a script for checking this DNS alias value.
When the DNS alias match with server A, then is this the production server and it must start some services again after a reboot. For server B is not allowed to start some services after reboot because he is the backup server. The necessary services
on both servers will be set on manually. When server B becomes the operational server, we change the DNS alias to server B and reboot both servers. Afterwards the services on server B will start and on server A don't.
Thanks!

Hi,
Here's a simple way you can test this:
$alias = 'CNAME'
$IP = (Test-Connection -ComputerName $alias -Count 1).IPV4Address.IPAddressToString
If ($IP -eq '10.10.10.10') { Write-Host "$alias is using PRODUCTION IP" -ForegroundColor Red }
Else { Write-Host "$alias is not using the production IP" }
Don't retire TechNet! -
(Don't give up yet - 12,575+ strong and growing)

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rootsman wrote:
Hi folks!
I have one question, is it possible to create alias name on DNS server for database (instance) name? I have test db on one machine and after migration i want to use alias name which is called test for second database server machine without changing host name locally or in application.
Is thios possible and what to put in tnsnames?
I have already tried but i fails.
I have done :
Created alias name TEST on DNS name and in its description put host name of server, and ping of it went ok
I wanted to test is this working in case of dblink createion and recevie error Error : ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
I have put in tnsnames this:
TEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = TEST)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = test)
If this situation is specific please could you provide me correct entry for my case in tnsnames file?
Thanks!Just to expand and clarify a bit of what LkrBrn posted ..
In your above TNSNAMES.ORA entry, note the following:
HOST=TEST "TEST" must resolve (via dns or local hosts file) to the ip address of a machine hosting an oracle listener
PORT=1521 means the target machine ('TEST', in your case) must be listening on port 1521
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Powershell : Checking DNS alias

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