Solution: Second postmaster / second DB cluster

Stephan Szabo wrote:
> On Thu, 16 Oct 2003, Oli Sennhauser wrote:
>
>
>>I would like to start a second postmaster on my server.
>>First problem was the lock file /tmp/.s.PGSQL.5432.lock
>>and its socket. But you can workaround that by the -k
>>parameter. So I was able to start at least 3 clusters...
>
>
> If you want to use separate directories for the socket, you
> need to use -h <directory> (and -p <port> if it's not the default)
> when connecting with psql. However, you probably just want to
> use different port numbers to start the postmasters and then use
> psql -p <port> to connect.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>

>>Thank you for answering.
>>>
>>> Do you mean -k <directory> (or -h <hostname>)? -k <directory> is
exactly
>>> what I did. And it did not work in my case. In my opinion we should not
>>> need -i and -h in this example, because I only want to do local
connects.
>
>psql -h /u00/app/pgsql/data/CLUSTER1
>means use a local socket located in that directory (with the
>"port" number of 5432 - which is used in determing the filename).
>
>>From the 7.3 psql manpage:
>-h hostname
>--host hostname
>Specifies the host name of the machine on which the postmaster is
>running. If host begins with a slash, it is used as the directory for >the
>Unix-domain socket.

Ok, now I understand it! Thank you verry much Stephan

Here is my final solution:

$ CLUSTER1
$ pg_ctl start -D $PG_DATA -l $PG_DATA/$PG_CID.log -o "-k $PG_DATA
-p $PG_PORT"
postmaster successfully started

$ CLUSTER2
$ pg_ctl start -D $PG_DATA -l $PG_DATA/$PG_CID.log -o "-k $PG_DATA
-p $PG_PORT"
postmaster successfully started

$ CLUSTER3
$ pg_ctl start -D $PG_DATA -l $PG_DATA/$PG_CID.log -o "-k $PG_DATA
-p $PG_PORT"
postmaster successfully started

$ ps -fu postgres
UID PID PPID C STIME TTY TIME CMD
postgres 402 1 0 10:29 pts/1 00:00:00
/u00/app/pgsql/products/7.4.0/bin/postmaster -k
/u00/app/pgsql/data/CLUSTER1 -p 5
postgres 404 402 0 10:29 pts/1 00:00:00 postgres: stats buffer process
postgres 406 404 0 10:29 pts/1 00:00:00 postgres: stats collector
process
postgres 436 1 0 10:29 pts/1 00:00:00
/u00/app/pgsql/products/7.4.0/bin/postmaster -k
/u00/app/pgsql/data/CLUSTER2 -p 5
postgres 438 436 0 10:29 pts/1 00:00:00 postgres: stats buffer process
postgres 439 438 0 10:29 pts/1 00:00:00 postgres: stats collector
process
postgres 469 1 0 10:29 pts/1 00:00:00
/u00/app/pgsql/products/7.3.3/bin/postmaster -k
/u00/app/pgsql/data/CLUSTER3 -p 5
postgres 471 469 0 10:29 pts/1 00:00:00 postgres: stats buffer process
postgres 473 471 0 10:29 pts/1 00:00:00 postgres: stats collector
process

$ netstat -ap | grep PGSQL
unix 2 [ ACC ] STREAM LISTENING 287991 402/postmaster
/u00/app/pgsql/data/CLUSTER1/.s.PGSQL.5432
unix 2 [ ACC ] STREAM LISTENING 288022 436/postmaster
/u00/app/pgsql/data/CLUSTER2/.s.PGSQL.5434
unix 2 [ ACC ] STREAM LISTENING 288051 469/postmaster
/u00/app/pgsql/data/CLUSTER3/.s.PGSQL.5436

$ CLUSTER1
$ psql -l -h $PG_DATA
List of databases
Name | Owner | Encoding
-----------+----------+-----------
T740A | postgres | SQL_ASCII
T740B | postgres | SQL_ASCII
template0 | postgres | SQL_ASCII
template1 | postgres | SQL_ASCII

$ CLUSTER2
$ psql -l -h $PG_DATA
List of databases
Name | Owner | Encoding
-----------+----------+-----------
template0 | postgres | SQL_ASCII
template1 | postgres | SQL_ASCII

$ CLUSTER3
$ psql -l -h $PG_DATA
List of databases
Name | Owner | Encoding
-----------+----------+-----------
template0 | postgres | SQL_ASCII
template1 | postgres | SQL_ASCII