Обсуждение: Differing data directories

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Differing data directories

От
"Ron Watkins"
Дата:

I have a postgresql server setup/installed (finally).

Currently, it’s installed data directory is: /var/lib/pgsql/10/data

However, I need to put a database into a custom filesystem.

Is it possible to have multiple PGDATA directories, and if so, how?

 

Currently, the postgres database is under /var/lib/pgsql/10/data, but I need my main database to be in a different filesystem…

Ron

 

Re: Differing data directories

От
"David G. Johnston"
Дата:
On Thu, Feb 22, 2018 at 9:28 AM, Ron Watkins <rwatki@gmail.com> wrote:

I have a postgresql server setup/installed (finally).

Currently, it’s installed data directory is: /var/lib/pgsql/10/data

However, I need to put a database into a custom filesystem.

Is it possible to have multiple PGDATA directories, and if so, how?

 

Currently, the postgres database is under /var/lib/pgsql/10/data, but I need my main database to be in a different filesystem…



Short answer, just "initdb" a new cluster and point it to the desired location.​

https://www.postgresql.org/docs/10/static/app-initdb.html

Now, the answer becomes longer since you will now have two clusters.  You will either want to remove the existing one or ensure the two play nicely.  It is further complicated by the means by which you installed and what services have been setup.

All databases in a cluster share the same storage location by default though you can create tablespaces and put different databases on different tablespaces.  But that likely adds more complexity to the running setup than you need - at least by creating a new cluster and getting it to work properly you only need to deal with complexity during the initial setup.

David J.

Re: Differing data directories

От
Laurenz Albe
Дата:
Ron Watkins wrote:
> I have a postgresql server setup/installed (finally).
> Currently, it’s installed data directory is: /var/lib/pgsql/10/data
> However, I need to put a database into a custom filesystem.
> Is it possible to have multiple PGDATA directories, and if so, how?
>  
> Currently, the postgres database is under /var/lib/pgsql/10/data,
> but I need my main database to be in a different filesystem…

One simple solution would be:

# systemctl stop postgresql-10  # or whatever it takes to stop the server
# mv /var/lib/pgsql/10/data /your/mountpoint
# ln -s /your/mountpoint/data /var/lib/pgsql/10/data

Then you have to make sure that the operating system user has
permissions to enter the mount point.

Start your server and you are done.

Yours,
Laurenz Albe
-- 
Cybertec | https://www.cybertec-postgresql.com