multiple postgresql servers in multiple jails?
hoschi at mouhaha.de
Wed Oct 24 06:55:58 PDT 2007
On Tue, Oct 23, 2007 at 10:06:08PM +0200, Oliver Fromme wrote:
> Oliver Peter wrote:
> > Does anybody have a running system with more than one jail hosting
> > more than one postgres server?
> Yes, you must configure them to use different port numbers,
> because the SysV IPC IDs are derived from the port number.
> If you try to run both servers with the default port, you'll
> get a conflict. Configure different port numbers, and it
> will work.
Thanks for that hint. After changing the port numbers for each
instance to a different one, it works - but only at first glance.
After making some test creates and inserts to all servers at the same
time I receive the 'out of memory' messages again...
Different UIDs, different ports, same error.
> By the way, the PostgreSQL developers do _not_ recommend to
> run multiple servers on the same machine, because of bad
> efficiency. It is much better (performance-wise) to run
> all databases within the same server engine. PostgreSQL
> has all the authentication and permission features you need
> to separate multiple databases within a single server, so
> there is really no need to use multiple jails.
Of course I understand that. But I would like to setup a test server
in a different jail beside my production jail/pgsql-server to be sure
not to crash my production server.
Performance does not matter (at this time in this specific case of
> I have these on a machine with a single PostgreSQL server,
> as per recommendations of the developers:
> options SHMMAXPGS=65536
> options SEMMAP=1024
> options SEMMNI=64
> options SEMMNS=1024
> options SEMUME=64
> options SEMMNU=128
Is this a good recommendation for a machine with only 1GB of RAM?
Oliver PETER, eMail: hoschi at mouhaha.de, ICQ# 113969174
"Worker bees can leave. Even drones can fly away.
The Queen is their slave."
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