IDS Forum

RE: Sqlhost entry on the client server

Posted By: Mike Walker
Date: Tuesday, 1 March 2016, at 10:51 a.m.

In Response To: RE: Sqlhost entry on the client server (medkba)

Don't worry about the NAME of the service used in the sqlhosts on the client
- what matters is the port in /etc/services that it maps to, and that must
be consistent with the port number on the server.

When you consolidate the servers, you will probably remove one of the
listeners on the server (although you don't have to - but let's assume
that's your plan).

Let's say that you remove the db2.* entries from the sqlhosts on the server
side. Now you will expect all traffic to come in to the db1 listener on
port 750. In that case, change the /etc/services on both clients so that
"sv" points to port 750. You may also want to change the server name used
for Client B to be db1.1 to avoid any confusion. If both servers have been
consolidated into one, then I would expect the sqlhosts on both Client A and
Client B to be the same, although technically they don't have to be.

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of medkba
Sent: Tuesday, March 01, 2016 8:32 AM
To: ids@iiug.org
Subject: RE: Sqlhost entry on the client server [36673]

It is because two different client server and different database server as
well. No issue on the name i.e.SV. but now consolidating to one DB server so
the service name should be unique. I.e.SV and SV1. but client servers side
use the name SV but different port. In this case, is it require to change
client name as SV and SV1.

Thank you very much
On 1 Mar 2016 11:24 pm, "Mike Walker" <mike@advancedatatools.com> wrote:

> The sv and sv1 are only used to look up the port number in
> /etc/services - it's the port number that is important. Once the
> client connection has the port that is what is used to establish the
connection.
>
> The service name in sqlhosts entry in /etc/services on the client does
> NOT need to match that used by the server - just the port number.
>
> So this set up is fine, but is confusing because Client B is has the
> service name of "sv" using port 7002, where on the server, "sv" refers
> to port 750.
> It is not necessary to change the name in the client, but might simply
> be less confusing.
>
> Mike Walker
> Advanced DataTools
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> medkba
> Sent: Tuesday, March 01, 2016 8:14 AM
> To: ids@iiug.org
> Subject: Re: Sqlhost entry on the client server [36671]
>
> Thank you very much Mike Walker
>
> But the current setup is *client server A* and *client server B* is
> using the name SV but the /etc/Services defined different port.
>
> In the server side SV and SV1. Is it required to change client to
> adapt same as server side?
>
> By the way, the onipcshm connections (shared memory) in the client
> sqlhosts file are of no value - unless those clients reside on ServerA.
> >> Will remove this entry
>
> On Tue, Mar 1, 2016 at 11:07 PM, Mike Walker
> <mike@advancedatatools.com>
> wrote:
>
> > The SERVER sqlhosts file is used to set up listeners on the ports
> > that
> are
>
> > listed for the onsoctcp entries in the file. So when your server
> (serverA)
>
> > is running, it will be listening on ports 750 and 7002 for incoming
> > connections.
> >
> > The CLIENT sqlhosts file is used so the applications know where to
> connect
>
> > to - server address and port. Note how the client sqlhosts refers to
> > the remote server (serverA) and not the local server.
> >
> > By the way, the onipcshm connections (shared memory) in the client
> sqlhosts
> > file are of no value - unless those clients reside on ServerA.
> >
> > Mike Walker
> > Advanced DataTools
> >
> > -----Original Message-----
> > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
> > Of medkba
> > Sent: Tuesday, March 01, 2016 7:54 AM
> > To: ids@iiug.org
> > Subject: Sqlhost entry on the client server [36668]
> >
> > Hi All,
> >
> > I have two client server and one database server.
> >
> > In the database server sqlhost file defined as
> >
> > db1 onipcshm serverA sv
> > db1.1 onsoctcp ServerA sv
> > db2 onipcshm serverA sv1
> > db2.1 onsoctcp ServerA sv1
> >
> > etc/services
> > sv -750
> > sv1 -7002
> >
> > Client A
> > db1 onipcshm serverA sv
> > db1.1 onsoctcp ServerA sv
> >
> > /etc/services
> > sv 750/tcp
> >
> > Client B
> > db2 onipcshm serverA sv
> > db2.1 onsoctcp ServerA sv
> >
> > /etc/services
> > sv 7002/tcp
> >
> > If the connection happened from client server A and how they use
> > services port i..e using client port no or server port no?
> >
> > if the client sqlhost file is used then What is the role of server
> sqlhost
>
> > file?
> >
> > Thank you very much
> >
> > --001a113f0e7cc55492052cfdee51
> >
> >
> >
>
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> >
> >
> >
> >
>
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> --047d7bf0c28e84efb0052cfe3703
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Messages In This Thread

• Sqlhost entry on the client server
  medkba -- Tuesday, 1 March 2016, at 9:53 a.m.
  • RE: Sqlhost entry on the client server
    Mike Walker -- Tuesday, 1 March 2016, at 10:07 a.m.
    • Re: Sqlhost entry on the client server
      medkba -- Tuesday, 1 March 2016, at 10:14 a.m.
      • RE: Sqlhost entry on the client server
        Mike Walker -- Tuesday, 1 March 2016, at 10:23 a.m.
        • RE: Sqlhost entry on the client server
          medkba -- Tuesday, 1 March 2016, at 10:32 a.m.
          • RE: Sqlhost entry on the client server
            Mike Walker -- Tuesday, 1 March 2016, at 10:51 a.m.
            • RE: Sqlhost entry on the client server
              medkba -- Tuesday, 1 March 2016, at 8:24 p.m.
              • RE: Sqlhost entry on the client server
                Mike Walker -- Tuesday, 1 March 2016, at 8:40 p.m.
              • Re: Sqlhost entry on the client server
                Art Kagel -- Wednesday, 2 March 2016, at 6:30 a.m.
  • Re: Sqlhost entry on the client server
    JACQUES RENAUT -- Tuesday, 1 March 2016, at 10:10 a.m.
    • Re: Sqlhost entry on the client server
      Art Kagel -- Tuesday, 1 March 2016, at 12:24 p.m.
      • Re: Sqlhost entry on the client server
        medkba -- Tuesday, 1 March 2016, at 8:18 p.m.

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