I have a CentOS 6 server thats already running 9.0, ... 9.3 for development.

I added 9.4 to it by ...
yum install http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-centos94-9.4-1.noarch.rpm
    yum install postgresql94{,-devel,-server,-contrib}

I created /etc/sysconfig/pgsql/postgresql-9.4 with...
    PGENGINE=/usr/pgsql-${PGMAJORVERSION}/bin
    PGPORT=5436
    PGDATA=/var/lib/pgsql/${PGMAJORVERSION}/data
    PGLOG=/var/lib/pgsql/${PGMAJORVERSION}/pgstartup.log

(same as all the others except a unique port)
and initdb via..
    service postgresql-9.4 initdb

all good so far.  but when I ...

    service postgresql-9.4 start

it fails, leaving the following in pgstartup.log...

< 2015-09-29 09:38:15.270 PDT >LOG: could not bind IPv6 socket: Address already in use < 2015-09-29 09:38:15.270 PDT >HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry. < 2015-09-29 09:38:15.270 PDT >LOG: could not bind IPv4 socket: Address already in use < 2015-09-29 09:38:15.270 PDT >HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry. < 2015-09-29 09:38:15.270 PDT >WARNING: could not create listen socket for "localhost" < 2015-09-29 09:38:15.270 PDT >FATAL: could not create any TCP/IP sockets

does the 9.4 yum install no longer support using the sysconfig settings fragments ? I see what looks like the correct shell code for it in /etc/rc.d/init.d/postgresql-9.4 ...

    # Override defaults from /etc/sysconfig/pgsql if file is present
    [ -f /etc/sysconfig/pgsql/${NAME} ] && . /etc/sysconfig/pgsql/${NAME}


....arrrrgh, comment in /etc/rc.d/init.d/postgresql-9.4 would suggest so...


    # Version 9.4.0 Devrim Gunduz <dev...@gunduz.org>
    # Remove PGPORT variable

so... how do you run multiple versions??

--
john r pierce, recycling bits in santa cruz



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