How To Change RDS Postgresql Configurations

- With RDS you don't edit config files directly. Instead edit the parameters through the RDS console, or via the API.

- As of now, RDS does allow changing configurations. So you can

• See the list of configurations that your RDS is using.
• You can change these parameters. You can change those that are listed in the RDS reference page.

- This post give an example of change wal_level from replica to logical

What’s In This Document

• General RDS configruation
• Change RDS configruation
• Check wal_level

🚀 General RDS configruation

• The RDS use Parameter group default.postgres10. A parameter group acts as a container for engine configuration values that are applied to one or more DB instances.

• It's not able to change parameters in the default parameter groups
  

🚀 Change RDS configruation

1. Create new parameter group

2. Set wal_level from replica to logical

3. Modify db instance to apply new parameter group

• The config require reboot

🚀 Check wal_level

ubuntu@root:~$ psql -h mydb -p 5432 -U dbadmin_user -d mydatabase 
Password for user dbadmin_user: 
psql (11.5 (Ubuntu 11.5-3.pgdg18.04+1), server 10.4)
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type "help" for help.

mydatabase=> show wal_level;
 wal_level 
-----------
 logical
(1 row)

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