Date: Thu, 22 Mar 2007 08:28:33 +1100 From: Antony Mawer <fbsd-questions@mawer.org> To: Greg Barniskis <nalists@scls.lib.wi.us> Cc: Jonathan Horne <freebsd@dfwlp.com>, Bill Moran <wmoran@potentialtech.com>, freebsd-questions@freebsd.org Subject: Re: started playing with jails Message-ID: <4601A381.1030301@mawer.org> In-Reply-To: <4601626B.1070702@scls.lib.wi.us> References: <42991.167.246.36.14.1174490156.squirrel@webmail.dfwlp.org> <4601501C.3060605@gmail.com> <10072.167.246.36.14.1174492472.squirrel@webmail.dfwlp.org> <20070321121031.d95cadf6.wmoran@potentialtech.com> <46015BFD.4060806@scls.lib.wi.us> <20070321122852.8eaa2663.wmoran@potentialtech.com> <4601626B.1070702@scls.lib.wi.us>
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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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