"permission denied" for pg_dump output file

Question

i used below command to backup my database

sudo -u user_name pg_dump dbName -f /home ..../someWhere/db.sql

but it gives me this :

pg_dump: [archiver] could not open output file "/home ..../someWhere/db.sql": Permission denied

after googling this issue i find that i must backup my data under the /tmp path , but doesn't work

how can i resolve this issue ?

thanks in advance,

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i am using Ubuntu 12.04 lts

Answer 1

It looks like your pg_dump is working fine, but it is having problems opening the output file as the sudo user. Just guessing, but, if you do the redirection as the user (presumably the one running the pg_dump command) id, that should do it, that is:

sudo -u user_name pg_dump dbName > /home ..../someWhere/db.sql

Using this technique your pg_dump will run as the postgres user (assuming that is who user_name is) and the file being written in /home... will be written using the permission of the user running the command (this user might have different permissions than the postgres user).