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Thread: PGSQL Bug

PGSQL Bug

From
Michael Kunzmann
Date:
Hello,

I've noticed the following issue when autostarting PostgreSQL under
Ubuntu 12.04 64bit by bootup. I'm using PostgreSQL 9.1.

A manual service start works (service postgresql start).

2013-07-18 06:44:12 CEST FATAL:  could not create shared memory segment:
Das Argument ist ung?ltig
2013-07-18 06:44:12 CEST DETAIL:  Failed system call was
shmget(key=5432001, size=41263104, 03600).
2013-07-18 06:44:12 CEST HINT:  This error usually means that
PostgreSQL's request for a shared memory segment exceeded your kernel's
SHMMAX parameter.  You can either reduce the request size or reconfigure
the kernel with larger SHMMAX.  To reduce the request size (currently
41263104 bytes), reduce PostgreSQL's shared memory usage, perhaps by
reducing shared_buffers or max_connections.
    If the request size is already small, it's possible that it is less
than your kernel's SHMMIN parameter, in which case raising the request
size or reconfiguring SHMMIN is called for.
    The PostgreSQL documentation contains more information about shared
memory configuration.
2013-07-18 07:17:28 CEST FATAL:  could not create shared memory segment:
Das Argument ist ung?ltig
2013-07-18 07:17:28 CEST DETAIL:  Failed system call was
shmget(key=5432001, size=41263104, 03600).
2013-07-18 07:17:28 CEST HINT:  This error usually means that
PostgreSQL's request for a shared memory segment exceeded your kernel's
SHMMAX parameter.  You can either reduce the request size or reconfigure
the kernel with larger SHMMAX.  To reduce the request size (currently
41263104 bytes), reduce PostgreSQL's shared memory usage, perhaps by
reducing shared_buffers or max_connections.
    If the request size is already small, it's possible that it is less
than your kernel's SHMMIN parameter, in which case raising the request
size or reconfiguring SHMMIN is called for.
    The PostgreSQL documentation contains more information about shared
memory configuration.

Thank you.

Re: PGSQL Bug

From
David Johnston
Date:
Michael Kunzmann wrote
> Hello,
>
> I've noticed the following issue when autostarting PostgreSQL under
> Ubuntu 12.04 64bit by bootup. I'm using PostgreSQL 9.1.
>
> A manual service start works (service postgresql start).

Not sure what you actually think is the bug...especially since PostgreSQL
starts when run manually.

Apparently the boot routine for "bootup" is trying to launch PostgreSQL
before the SHM... parameters are exported with sufficient values to support
your configuration.

Or, the boot routine is trying to start a different instance of PostgreSQL
than the one you start manually.

I am not that strong a linux user but it does seem you need to provide
considerably more detail as to your install/configuration if you expect help
resolving your issue.  Specifically, HOW did you install PostgreSQL and what
configuration steps have you performed.

David J.






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Re: PGSQL Bug

From
bricklen
Date:
On Wed, Jul 17, 2013 at 10:46 PM, Michael Kunzmann <mail@michaelkunzmann.com
> wrote:

>
> I've noticed the following issue when autostarting PostgreSQL under
> Ubuntu 12.04 64bit by bootup. I'm using PostgreSQL 9.1.
>
> 2013-07-18 06:44:12 CEST FATAL:  could not create shared memory segment:
>

How much RAM do you have, and what does the output of the following command:
sysctl -ar 'kernel.shm'

Re: PGSQL Bug

From
bricklen
Date:
On Thu, Jul 18, 2013 at 10:52 AM, Michael Kunzmann <mail@michaelkunzmann.com
> wrote:

>  Am 18.07.2013 17:33, schrieb bricklen:
>
>
> On Wed, Jul 17, 2013 at 10:46 PM, Michael Kunzmann <
> mail@michaelkunzmann.com> wrote:
>
>>
>> I've noticed the following issue when autostarting PostgreSQL under
>> Ubuntu 12.04 64bit by bootup. I'm using PostgreSQL 9.1.
>>
>> 2013-07-18 06:44:12 CEST FATAL:  could not create shared memory segment:
>>
>
> How much RAM do you have, and what does the output of the following
> command:
> sysctl -ar 'kernel.shm'
>
> Hello, I have 8GB of RAM.
>
> The values are:
> kernel.shm_rmid_forced = 0
> kernel.shmall = 2097152
> kernel.shmmax = 268435456
> kernel.shmmni = 4096
>
>
Set your kernel.shmall and kernel.shmmax higher in /etc/sysctl.conf. Eg.
kernel.shmall = 6442450944
kernel.shmmax = 6442450944

-- Reload after changing it
sudo sysctl -p

More details can be found here:
http://www.postgresql.org/docs/current/static/kernel-resources.html