Обсуждение: Re: [PORTS] Logging (was Re: [GENERAL] PostgreSQL 7.0-2 RPMset released.)

Palle Girgensohn writes:

> > > The real problem with redirecting the postmaster output is the issue
> > > of log rolling,

> I really enjoy using apache's rotatelogs program. stderr is
> redirected through a pipe to a very small and robust C program,
> rotatelogs, that takes as arguments number of seconds between
> log rotates and the log filename. Logs are rotated every
> argv[2] seconds. The rotatelogs program takes care of closing
> and reopening, and nothing has to done from the application,
> just start postmaster with '2>&1 | rotatelogs ...' at the end,
> and log to stderr.

Now there's a good idea. Why don't we abduct that program and teach pg_ctl
about it. (After all, we abducted that one as well. :)


--
Peter Eisentraut                  Sernanders väg 10:115
peter_e@gmx.net                   75262 Uppsala
http://yi.org/peter-e/            Sweden

On Mon, 22 May 2000, Peter Eisentraut wrote:

> Now there's a good idea. Why don't we abduct that program and teach pg_ctl
> about it. (After all, we abducted that one as well. :)

Imitation is the sincerest form of flattery.  Not to mention this is the
bazar.


Rod
--
Roderick A. Anderson
raanders@altoplanos.net               Altoplanos Information Systems, Inc.
Voice: 208.765.6149                            212 S. 11th Street, Suite 5
FAX: 208.664.5299                                  Coeur d'Alene, ID 83814

Hi,

Glad to hear you like the idea.

May I also suggest my favourite patch for rotatelogs
(enclosed). It creates a "hard link" to the latest log using
the base logfilename. i.e:

-rw-r--r-- 1 root wheel  8901 May 19 04:45
localhost-access.log.0958694400
-rw-r--r-- 2 root wheel 18430 May 21 17:05
localhost-access.log.0958867200
-rw-r--r-- 2 root wheel 18430 May 21 17:05 localhost-access.log

This is very nice when developing and debugging, since you
don't need to check for the latest log's filename, but can just
issue "tail -f localhost-access.log". FreeBSD'er can enjoy tail
-F, which will follow the log even after a rotation...

The function should probably be optional?

Cheers,
Palle

"Roderick A. Anderson" wrote:
>
> On Mon, 22 May 2000, Peter Eisentraut wrote:
>
> > Now there's a good idea. Why don't we abduct that program and teach pg_ctl
> > about it. (After all, we abducted that one as well. :)
>
> Imitation is the sincerest form of flattery.  Not to mention this is the
> bazar.
>
> Rod
> --
> Roderick A. Anderson
> raanders@altoplanos.net               Altoplanos Information Systems, Inc.
> Voice: 208.765.6149                            212 S. 11th Street, Suite 5
> FAX: 208.664.5299                                  Coeur d'Alene, ID 83814

--
Palle--- src/support/rotatelogs.c~    Mon Aug  3 11:15:33 1998
+++ src/support/rotatelogs.c    Sun Mar 26 22:42:40 2000
@@ -14,6 +14,7 @@
 #include <time.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <unistd.h>

 int main (int argc, char **argv)
 {
@@ -73,6 +74,8 @@
         perror(buf2);
         exit(2);
         }
+        unlink(szLogRoot);
+        link(buf2, szLogRoot);
     }
     if (write(nLogFD, buf, nRead) != nRead) {
         perror(buf2);