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I have installed PostgreSQL 8.4 and 9.1 on same Ubuntu machine and I want to try to run only 9.1 and 8.4 to stay off. When I run /etc/init.d/postgresql start it starts both. How to start only one version, in this case 9.1 ?

Ubuntu is upgraded to 12.04, bott are installed via apt-get install but I added to sources list for 9.1 and then update and apt-get install.

There is no /etc/init.d/postgresql-9.1 start

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What version of Ubuntu and how did you install 9.1 ? Why not simply remove 8.4 ? – bodhi.zazen Jan 29 '14 at 16:56
    
@bodhi.zazen I have edited – Damir Jan 29 '14 at 16:58
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What sources and what makes you think 8.4 is installed let alone running ? error message ? – bodhi.zazen Jan 29 '14 at 17:04
    
@bodhi.zazen When run /etc/init.d/postgresql start it writes starting 8.4 and after starting stating 9.1 and after when I run netstat -ltnp for port 5432 I got 8.4 – Damir Jan 29 '14 at 17:10
    
I suggest you remove postgresql 8.4 . – bodhi.zazen Jan 29 '14 at 17:34

Edit /etc/postgresql/8.4/main/start.conf and change auto to manual.

Or, if you no longer wish to keep the 8.4 database, pg_dropcluster it, or just uninstall 8.4.

For more information see https://help.ubuntu.com/community/PostgreSQL

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You can run /etc/init.d/postgresql start 9.1 to explicitly start just 9.1.

I figured this out by looking at the startup script. In /etc/init.d/postgresql you'll see something like

# versions can be specified explicitly
if [ -n "$2" ]; then
    versions="$2 $3 $4 $5 $6 $7 $8 $9"
else
    get_versions
fi

$2 in bash means the second argument to the script, thus.

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