How do I use md5 authentication in Postgresql? - postgresql

Question

I am creating a role in postgresql. The documentation gives me the following example with clear-text password:
CREATE ROLE foo WITH LOGIN PASSWORD 'secret'
My task is to use MD5 instead of a clear-text password because it is not secure enough. However, the documentation merely mentioned the possibility to use md5 instead of a password, without giving any example code. I wonder how could I re-write the code above to implement MD5? Thank you in advance!

Answer 1

To change the authentication method:
Open a terminal window
Change into the postgres bin directory
Example: cd /usr/local/pgsql/bin
Note: Depending on your install environment the path to the bin directory may vary.
Type su – postgres and press Enter. This will change the logged in to the postgres user.
From the bin directory type ./psql
Type ALTER USER postgres password 'your shell account postgres password'; and press Enter. ALTER ROLE should be displayed.
Type \q and press Enter
Type vi /path to data directory/pg_hba.conf and press Enter
Modify the line at the bottom of the config file to resemble one of these examples.
Note: You will probably only have to change the word trust to md5. The line or lines should already exist.
host all postgres your.ip your.subnet md5
host all all your.ip your.subnet md5
Note: If you are using vi as the editor press i to insert text
Save the changes
Note: If you are using vi as the editor press i to insert then press :wq! to save the changes.
From the postgres bin directory type./pg_ctl restart -D /usr/local/pgsql/data and press Enter