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IDS Forum

RE: Sqlhost entry on the client server

Posted By: Mike Walker
Date: Tuesday, 1 March 2016, at 8:40 p.m.

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

Both the server and client must reference the same port, regardless of the
name that's being using in the services file.

Don't think of the client connection coming FROM a port - the sqlhosts on
the client just lists the port that the client must connect to on the
SERVER.

Mike

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of medkba
Sent: Tuesday, March 01, 2016 6:24 PM
To: ids@iiug.org
Subject: RE: Sqlhost entry on the client server [36686]

Two instances into one host so that we need to have two entry sv and sv1.
I undserstand that listening port on server side for waiting for connection
at the same time application is also coming same port for the connection.
Am i right? If this is corrrect, i need to have both entry client and server
should be same.

Thank you very much Mike Walker
On 1 Mar 2016 11:51 pm, "Mike Walker" <mike@advancedatatools.com> wrote:

> 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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> > >
> > >
> > >
> > >
> >
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> > >
> > >
> >
> > --047d7bf0c28e84efb0052cfe3703
> >
> >
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> >
> >
> >
> >
>
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> --001a1141b24ef2b377052cfe76c3
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