Re: [HACKERS] [PATCHES] Avahi support for Postgresql
Am Samstag, den 29.03.2008, 12:25 + schrieb [EMAIL PROTECTED]: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Sat, Feb 23, 2008 at 01:13:38PM +0100, Mathias Hasselmann wrote: [...] Avahi/Bonjour/DNS-SD support[1] is very important, for integrating Postgresql with modern desktop environments like OSX, GNOME, KDE: It's very convenient to choose active DBMS servers in your local network from a list, instead of memorizing cryptic connection parameters. [...] People not wanting DNS-SD support for their server can easily control that feature via the --with-avahi configure scripts. Sorry for a dumb question, but I couldn't figure that out from your references [1]..[4]: does that mean that the PostgreSQL server would advertise itself on the local net? Or what is the purpose of liking-in libavahi into the postmaster? Yes, that's the purpose. Surely one wouldn't want this in a data center? Yes, this feature definitely targets small-office use, personal use, DB developers. Don't know enough about data centers to judge the impact there, but since Avahi - as used in the patch - announces to the local network only, the impact sould be small. Still you can tell Avahi to explicitly announce at a certain, non-local domain, but this feature is not implemented by the patch. Maybe database developers in large network environments could make use of such announcements. It would be trivial to add. Is there a possiblity to disable that at run time? The feature is disabled by default. As long as you do not specify a zeroconf_name in your configuration file, nothing happens. This is the same behavior as established by the Bonjour code. Ciao, Mathias -- Mathias Hasselmann [EMAIL PROTECTED] http://www.openismus.com/ - We can get it done. -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tue, Apr 01, 2008 at 09:35:56AM +0200, Mathias Hasselmann wrote: Am Samstag, den 29.03.2008, 12:25 + schrieb [EMAIL PROTECTED]: [...] Sorry for a dumb question, but I couldn't figure that out from your references [1]..[4]: does that mean that the PostgreSQL server would advertise itself on the local net? Or what is the purpose of liking-in libavahi into the postmaster? Yes, that's the purpose. Surely one wouldn't want this in a data center? Yes, this feature definitely targets small-office use, personal use, DB developers [...] Still you can tell Avahi to explicitly announce at a certain, non-local domain, but this feature is not implemented by the patch. Maybe database developers in large network environments could make use of such announcements. It would be trivial to add. Personally, I'be rather scared than delighted ;-) Is there a possiblity to disable that at run time? The feature is disabled by default. As long as you do not specify a zeroconf_name in your configuration file, nothing happens. This is the same behavior as established by the Bonjour code. Thanks, good to know. Isn't there a less-intrusive option to linking a lib into each and every possible server, like a config file in which to put what is to be announced? Regards - -- tomás -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFH8iRFBcgs9XrR2kYRAmJ0AJkB7MkxfYI0nVa4RqHVEV1HYjz41gCdEgWz YQ2T4Y/xfoLRF4D6hMLbpEk= =Goho -END PGP SIGNATURE- -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
Am Dienstag, den 01.04.2008, 12:02 + schrieb [EMAIL PROTECTED]: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tue, Apr 01, 2008 at 09:35:56AM +0200, Mathias Hasselmann wrote: Am Samstag, den 29.03.2008, 12:25 + schrieb [EMAIL PROTECTED]: [...] Sorry for a dumb question, but I couldn't figure that out from your references [1]..[4]: does that mean that the PostgreSQL server would advertise itself on the local net? Or what is the purpose of liking-in libavahi into the postmaster? Yes, that's the purpose. Surely one wouldn't want this in a data center? Yes, this feature definitely targets small-office use, personal use, DB developers [...] Still you can tell Avahi to explicitly announce at a certain, non-local domain, but this feature is not implemented by the patch. Maybe database developers in large network environments could make use of such announcements. It would be trivial to add. Personally, I'be rather scared than delighted ;-) So in data centers you don't even trust the machines in your broadcast domain? Is there a possiblity to disable that at run time? The feature is disabled by default. As long as you do not specify a zeroconf_name in your configuration file, nothing happens. This is the same behavior as established by the Bonjour code. Thanks, good to know. Isn't there a less-intrusive option to linking a lib into each and every possible server, like a config file in which to put what is to be announced? You could directly talk to the D-Bus interface of Avahi. libavahi-client just is a convenience wrapper. Well, but this route will be much more cumbersome. One other route is calling avahi-publish-service on startup and killing it on shutdown, but: avahi-publish-service really only exists for demonstration purposes and doesn't handle service name collisions for instance. I don't believe that a high-profile application like Postgresql should rely on low-quality hacks, like invoking educational demo programs. Ciao, Mathias -- Mathias Hasselmann [EMAIL PROTECTED] http://www.openismus.com/ - We can get it done. -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tue, Apr 01, 2008 at 05:07:31PM +0200, Mathias Hasselmann wrote: [...] Personally, I'be rather scared than delighted ;-) So in data centers you don't even trust the machines in your broadcast domain? Kind of. Put it another way: never have services running you don't use. [...] Isn't there a less-intrusive option to linking a lib into each and every possible server, like a config file in which to put what is to be announced? You could directly talk to the D-Bus interface of Avahi. libavahi-client just is a convenience wrapper. Well, but this route will be much more cumbersome. So this goes through the D-Bus. Makes kind of sense. Thanks for the enlightenment. One other route is calling avahi-publish-service on startup and killing it on shutdown, but: avahi-publish-service really only exists for demonstration purposes and doesn't handle service name collisions for instance. I don't believe that a high-profile application like Postgresql should rely on low-quality hacks, like invoking educational demo programs. Unelegant as it might seem -- this solution still affords a lot more when it comes to separation of concerns. I'm still a bit wary at the prospect that each and every daemon evolves into a huge fuzzball linked to all conceivable service-lets with a multitude of funny side-effects (remember tcpwrappers?). Of course, you can always disable this at compile time, but let's face it: with the predominance of binary distribs, the path of least resistance will be to put up with whatever strange side-effects. I would really prefer a more loosely coupled system. Regards - -- tomás -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFH8lYJBcgs9XrR2kYRAmDJAJ4jWKYkhUfKEAIaZVnIbAAEqJF2AwCfS/6D 4rH9OoY7wjia7h1cuk5CjZI= =AF1W -END PGP SIGNATURE- -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
On Tue, 2008-04-01 at 15:34 +, [EMAIL PROTECTED] wrote: I would really prefer a more loosely coupled system. The functionality will be much the same. The implementation would be more difficult and obscure and there would be more points of failure and more things to configure, but it wouldn't remove much risk, I think. Anyway, this feature is already in Postgres when it's built for MacOS X. So this decision seems to have been made already, at least for that platform. -- [EMAIL PROTECTED] www.murrayc.com www.openismus.com -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Sat, Feb 23, 2008 at 01:13:38PM +0100, Mathias Hasselmann wrote: [...] Avahi/Bonjour/DNS-SD support[1] is very important, for integrating Postgresql with modern desktop environments like OSX, GNOME, KDE: It's very convenient to choose active DBMS servers in your local network from a list, instead of memorizing cryptic connection parameters. [...] People not wanting DNS-SD support for their server can easily control that feature via the --with-avahi configure scripts. Sorry for a dumb question, but I couldn't figure that out from your references [1]..[4]: does that mean that the PostgreSQL server would advertise itself on the local net? Or what is the purpose of liking-in libavahi into the postmaster? Surely one wouldn't want this in a data center? Is there a possiblity to disable that at run time? Thanks for any insights - -- tomás -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFH7jUxBcgs9XrR2kYRAsfOAJ0Ulfydo3G1kzQo3HTOdjtswA1A2gCfYYyL VHprJ63unId85/Iht4ha2RE= =get0 -END PGP SIGNATURE- -- Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-patches
Re: [HACKERS] [PATCHES] Avahi support for Postgresql
Mathias Hasselmann wrote: The patches were in my initial mail, but now I've also uploaded them to my personal site for convenience: http://taschenorakel.de/files/pgsql-avahi-support/ Hmm, a quick look at the third patch reveals that it is using the threaded Avahi client. That's a showstopper. Please consider using some other approach -- writing our own handlers for AvahiPoll would seem apropos. -- Alvaro Herrerahttp://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
