ramfs

pg_on_ramfs.txt

https://stackpointer.io/unix/linux-create-ram-disk-filesystem/438/

root@db:~# rm -rf /mnt/ramdisk
root@db:~# mknod -m 660 /dev/ram0 b 1 0
root@db:~# chown postgres:disk /dev/ram0
root@db:~# mkdir -p /mnt/ramdisk
root@db:~# chown -R postgres /mnt/ramdisk
root@db:~# mount -t ramfs -o size=128M,maxsize=128M /dev/ram0 /mnt/ramdisk
root@db:~# ls -ld /mnt/ramdisk
drwxr-xr-x 2 root root 0 Jun 22 18:52 /mnt/ramdisk
root@db:~# chown -R postgres /mnt/ramdisk
root@db:~# ls -ld /mnt/ramdisk
drwxr-xr-x 2 postgres root 0 Jun 22 18:52 /mnt/ramdisk
root@db:~# su - postgres
postgres@db:~$ cd /mnt/ramdisk
postgres@db:/mnt/ramdisk$ initdb -D db
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

creating directory db ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default time zone ... Asia/Kolkata
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok

initdb: warning: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success. You can now start the database server using:

    pg_ctl -D db -l logfile start

postgres@db:/mnt/ramdisk$  pg_ctl -D db -l logfile start
waiting for server to start.... done
server started
postgres@db:/mnt/ramdisk$ psql -c 'select 1'
 ?column?
----------
        1
(1 row)