Why don't you copy/move the entire data directory (minus pg_xlog if you are separating them)

-----Original Message-----
From: Sergiusz Jarczyk [mailto:sergiusz.jarczyk@qresc.com]
Sent: Wed 9/28/2005 3:34 PM
To: pgsql-admin@postgresql.org
Cc:
Subject: Re: [ADMIN] Postgresql 8.0.3, symbolic link to /var/lib/pgsql/data/base



Hi Jeffrey

Jeffrey Tenny wrote:

> I'm trying to move my databases to another drive.
>
> With postmaster off, I create:
>
> /home/pgsql
>
> mv /var/lib/pgsql/data/base /home/pgsql/
>
>
> I make sure that /home/pgsql is owned by postgres, and only 'rwx' for
> the owner. All the permissions look fine.
>
> from /var/lib/pgsql/data, I do
>
> ln -s /home/pgsql/base
>
> Of course the link permissions look like:
>
> lrwxrwxrwx 1 postgres postgres 16 Sep 28 14:21 base -> /home/pgsql/base
>
>
> The postmaster starts, but attempts to access the database complain
> that permission is denied:
>
> $ psql -l
> psql: FATAL: could not access directory "/var/lib/pgsql/data/base/1":
> Permission denied
>
>
> Any clues about why this won't work?
> I've searched the archives, but most references were to invalid
> permissions on the directories and I'm pretty sure I've got those right.
>
> All my pgsql dirs look pretty much like:
> drwx------ 3 postgres postgres 4096 Sep 28 14:21 pgsql
>
> Both in the original /var/lib/pgsql area, and the /home/pgsql area.
>

Try to issue chown -R postgres.postgres /home/pgsql

Sergiusz


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Anjan Dave wrote:
> Why don't you copy/move the entire data directory (minus pg_xlog if you are separating them)

I tried that too, and then postmaster wouldn't even start. I don't
remember if it was a permission error or if it was complaining it
couldn't find the configuration files.

I suspect whatever symlink problems are manifesting in just moving
'base' also apply to moving 'data'.

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Jeffrey Tenny wrote:

> Anjan Dave wrote:
>
>> Why don't you copy/move the entire data directory (minus pg_xlog if
>> you are separating them)
>
>
> I tried that too, and then postmaster wouldn't even start. I don't
> remember if it was a permission error or if it was complaining it
> couldn't find the configuration files.
>
> I suspect whatever symlink problems are manifesting in just moving
> 'base' also apply to moving 'data'.


Check the file ownerships. Maybe a chown -R postgres /home/postgres
might be in order...

Also, if you are using SE-Linux, this can make things interesting...

Best Wishes,
Chris Travers
Metatron Technology Consulting

>
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> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
>


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