On Tue, 3 May 2005, [iso-8859-1] Dag-Erling Smørgrav wrote:
PostgreSQL has always had this problem, both on 4.x and 5.x. A hack was put in place last November to work around it, but it still exists, and while it may now be possible (with 8.0) for multiple postmasters to run on the same machine
'k, I've been doing multiple since 7.2 on the same machine, all on the same port, all different IPs, all on 4.x servers ... have never had an issue with crashes (its pretty much my most stable 4.x server) ...
In fact:
# ps aux | grep postmaster | egrep -v "postmaster:" | sort +1 -n scrappy 36569 0.0 0.0 14552 600 ?? IsJ 19Apr05 0:21.48 /usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data -S (postgres) scrappy 36675 0.0 0.0 258184 1052 ?? SsJ 19Apr05 14:10.24 /usr/local/bin/postmaster -D /usr/local/pgsql/data -S (postgres) scrappy 36865 0.0 0.0 16556 836 ?? IsJ 19Apr05 0:14.17 /usr/local/bin/postmaster -D /usr/local/pgsql/data -S (postgres) pgsql 37518 0.0 0.0 16400 396 ?? IsJ 19Apr05 0:04.02 /usr/local/bin/postmaster (postgres) pgsql 37815 0.0 0.0 8144 436 p9- IJ 19Apr05 0:14.62 /usr/local/bin/postmaster (postgres) pgsql 37962 0.0 0.0 8680 560 ?? IsJ 19Apr05 0:08.72 /usr/local/bin/postmaster (postgres) pgsql 38168 0.0 0.0 16400 452 ?? IsJ 19Apr05 0:37.69 /usr/local/bin/postmaster (postgres) pgsql 38316 0.0 0.0 7144 464 ?? IsJ 19Apr05 0:04.08 /usr/local/bin/postmaster (postgres) pgsql 38458 0.0 0.0 7208 380 ?? IsJ 19Apr05 0:04.01 /usr/local/bin/postmaster (postgres) pgsql 38596 0.0 0.0 6952 452 ?? IsJ 19Apr05 0:03.90 /usr/local/bin/postmaster (postgres) scrappy 38717 0.0 0.0 6952 436 ?? IsJ 19Apr05 0:03.98 /usr/local/bin/postmaster (postgres) pgsql 38868 0.0 0.0 8224 552 ?? SsJ 19Apr05 0:03.39 /usr/local/bin/postmaster -D /usr/local/pgsql/data (postgres) pgsql 38993 0.0 0.0 7912 584 ?? IsJ 19Apr05 0:06.41 /usr/local/bin/postmaster (postgres) pgsql 39126 0.0 0.0 7480 400 ?? IsJ 19Apr05 0:01.80 /usr/local/bin/postmaster -D /usr/local/pgsql/data (postgres) pgsql 87544 0.0 0.1 7948 3528 ?? IsJ Sun08PM 0:00.78 /usr/local/bin/postmaster -D /usr/local/pgsql/data (postgres)
# ipcs -a | fgrep -f /tmp/pids | sort +10 -n m 327683 5432003 --rw------- scrappy 1001 scrappy 1001 7 10256384 36569 38717 8:40:46 11:51:28 8:37:57 m 131076 5432004 --rw------- scrappy 1001 scrappy 1001 100 257957888 36675 38717 8:40:46 11:54:16 8:38:04 m 10092549 5432005 --rw------- scrappy 1001 scrappy 1001 12 10362880 36865 38717 8:40:46 11:29:20 8:38:25 m 131080 5432007 --rw------- pgsql pgsql pgsql pgsql 1 10436608 37518 39126 8:41:20 11:53:08 8:39:18 m 131081 5432008 --rw------- pgsql pgsql pgsql pgsql 6 2449408 37815 39126 8:41:20 11:52:32 8:39:43 m 393226 5432009 --rw------- pgsql pgsql pgsql pgsql 9 2596864 37962 39126 8:41:20 11:50:25 8:39:55 m 131083 5432010 --rw------- pgsql pgsql pgsql pgsql 1 10436608 38168 39126 8:41:20 11:52:15 8:40:06 m 1048588 5432011 --rw------- pgsql pgsql pgsql pgsql 1 1024000 38316 39126 8:41:20 11:51:53 8:40:19 m 131085 5432012 --rw------- pgsql pgsql pgsql pgsql 1 1024000 38458 39126 8:41:20 11:50:28 8:40:29 m 131086 5432013 --rw------- pgsql pgsql pgsql pgsql 1 761856 38596 39126 8:41:20 11:53:02 8:40:38 m 131087 5432014 --rw------- scrappy 1001 scrappy 1001 1 761856 38717 38717 8:40:46 11:50:42 8:40:46 m 131088 5432015 --rw------- pgsql pgsql pgsql pgsql 2 811008 38868 39126 8:41:20 1:59:39 8:40:58 m 1507345 5432016 --rw------- pgsql pgsql pgsql pgsql 1 761856 38993 39126 8:41:20 11:50:37 8:41:07 m 1310738 5432017 --rw------- pgsql pgsql pgsql pgsql 2 811008 39126 39126 8:41:20 0:59:01 8:41:20 m 196615 5432001 --rw------- pgsql pgsql pgsql pgsql 11 1548288 87544 8754420:32:30 11:50:56 20:32:30
So, unless I'm missing something here, each postmaster is acquiring its own ID, and the above servers consist of the following versions (all of which are built from ports):
1 postgresql-7.2.4_2 1 postgresql-7.4.1 1 postgresql-7.4.1_1 1 postgresql-7.4.2 2 postgresql-7.4.5 4 postgresql-7.4.6 1 postgresql-devel-8.0.0,1 1 postgresql-server-7.4.7 1 postgresql-server-7.4.7_3 1 postgresql-server-8.0.0 1 postgresql-server-8.0.1_3
So, unless I'm missing something, 4.x did allow for running multiple PostgreSQL servers, on the same machine, in multiple jails, each with their own distinct shared memory segment ... or am I mis-reading the above?
it is also still possible for malicious code in one jail to crash postmasters in other jails.
That one I can agree with, which is why all our database servers are on a seperate machine that 'clients' don't have access to ...
---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email: [EMAIL PROTECTED] Yahoo!: yscrappy ICQ: 7615664
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