Re: More "IpcMemoryCreate: shmget failed" errors

Okay, my first question is is *what* OS are you running on?  I get this
sort of error under Solaris if I use a defautl install of both the OS and
PostgreSQL, and have to use the -B option to reduce the number of segments
that PostgreSQL wants to configure ...

v6.5.3, I believe it was, changed the IPC usage so that it allocates all
it needs when you start, vs growing as required, so that it pre-allocates
... so if you were using a pre-"this code" version and moving up, this
might be triggering your problem ...

On Fri, 16 Jun 2000, Sean Kelly wrote:

> Hello again,
>
>     A couple of weeks ago I reported a problem installing both 7.0 and
> 7.0.2 where attempting to start "postmaster" produced an "IpcMemoryCreate:
> shmget failed"-type error.
>
>     Tom Lane suggested I use the "ipcclean" application to remove
> the "old shmem segments".
>
>     Running "ipcclean" with 7.0.2 gave "ipcclean: nothing removed" as
> the result "but postmaster" still gave the same "IpcMemoryCreate: shmget
> failed" error.
>
>     So ... I deleted this 7.0.2 installation and decided to go back to
> 6.5.3.  This installed, but when trying to start "postmaster" I got:
>
> ----- - - -----
> IpcMemoryCreate: shmget failed (Permission denied) key=5432010, size=120, permission=700
> IpcMemoryAttach: shmat failed (Permission denied) id=130
> FATAL 1:  AttachSLockMemory: could not attach segment
> ----- - - -----
>
>     So, I ran ipcclean that comes with 6.5.3 which finished with no
> messages, but "postmaster" still gives the "IpcMemoryCreate: shmget
> failed".
>
>     Hence, I cannot run PostgreSQL on this system any more :(
>
>     Any suggestions?  Is there a way that v7 could check for these old
> segments from v6 and remove them?  Is this even the problem here?  Any
> other ways to clear these suspected old segments at all?
>
>     Thanks for your time,
>
> --
> Sean Kelly <S.Kelly@ncl.ac.uk>
> "The best way to predict the future is to invent it" - Alan Kay
>

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org