On 22/03/2007 3:50 AM, Greg Barniskis wrote:
Bill Moran wrote:
My experiments with Postgres in jail predate the existence of that
setting.
When I was working with it, you had to frob a sysctl via /etc/sysctl.conf
But even then, I couldn't seem to get it to work -- the Postgres in the
jail would corrupt the shared memory of the postgres outside the jail.
It was ugly. Imagine big, wet tears rolling down my cheeks.
I haven't had the need to try it in a while, so it might work OK now, I
just don't know.
Ah, now that you mention it I do recall discussions of multiple
instances peeing in each others pools so to speak. I also thought there
was discussion of how to fix it, but have no idea where that went if
anywhere...
A single instance inside a jail does work quite happily if the knob
above is set.
From memory, I think the discussion went something like "Postgres uses
the TCP port number it binds to as its SYSV IPC ID... so if you want to
run multiple instances in jails/etc without conflict, run them on
different port numbers (and consequentially they will get separate SYSV
IPC IDs)".
--Antony
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