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Date:      Sun, 15 Jan 2012 18:03:26 +0000
From:      Matthew Seaman <m.seaman@infracaninophile.co.uk>
To:        freebsd-questions@freebsd.org
Subject:   Re: database apps that ignore sockets? [was: Solution: mysqld fails to run, can't create/find mysql.sock]
Message-ID:  <4F1314EE.6010404@infracaninophile.co.uk>
In-Reply-To: <4F952937-843B-4E38-B168-4E1720555D89@gmail.com>
References:  <0F82362E-2694-4EBC-B019-DE2F2C160D45@gmail.com> <7325D262-C6EB-42DB-870D-D3E2FAC9D0C1@mac.com> <1954AA20-BE6F-4F04-A770-49ECFA405B5D@gmail.com> <3D14230E-7E8A-4E35-8161-F5F9CB74C83C@mac.com> <3720E228-67EE-4F44-B828-AFA0125D2A54@gmail.com> <0E0B740B-4E2C-41C8-A8A4-BC92DC0D7089@mac.com> <4F952937-843B-4E38-B168-4E1720555D89@gmail.com>

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On 15/01/2012 17:50, Paul Beard wrote:
> The app configurations are not this granular: hostname and port are
> configured but there is nothing that makes clear that IF you specify
> localhost, you WILL BE using a domain socket which MUST BE
> /tmp/mysql.sock and IF you move it or your distribution prefers some
> other location you MAY NOT use localhost as you are now using a TCP
> socket which shouldn't require a hostname but because of the way the
> app is written, it does.

You can specify an alternate socket location in your connection
parameters.  For the command line client, it is:

   mysql -S /var/run/mysql/sock

This doesn't help if you say 'mysql -h localhost' and get diverted to
use the default socket though -- in that case you can have a .my.cnf
file containing (inter-alia)

[client]
   socket =3D /var/run/mysql/sock

For the various language APIs, you generally need to specify a DSN
string -- usually this looks something like

   mysql:database=3D$database;host=3D$hostname;port=3D$port

but for a socket connection you could say instead:

   mysql:database=3D$database;mysql_socket=3D/var/run/mysql/sock

=2E.. assuming that whoever wrote the application you're using made it
sufficiently flexible as to be able to accept something like that.

	Cheers,

	Matthew

--=20
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
JID: matthew@infracaninophile.co.uk               Kent, CT11 9PW


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