Setting up Trusted Language Extensions in your Aurora PostgreSQL DB cluster

The following steps assume that your Aurora PostgreSQL DB cluster is associated with a custom DB cluster parameter group. You can use the AWS Management Console or the AWS CLI for these steps.

When you set up Trusted Language Extensions in your Aurora PostgreSQL DB cluster , you install it in a specific database for use by the database users who have permissions on that database.

Console

To set up Trusted Language Extensions

Perform the following steps using an account that's a member of the rds_superuser group (role).

1. Sign in to the AWS Management Console and open the Amazon RDS console at https://console.aws.amazon.com/rds/.

2. In the navigation pane, choose your Aurora PostgreSQL DB cluster's Writer instance .

3. Open the Configuration tab for your Aurora PostgreSQL DB cluster writer instance. Among the Instance details, find the Parameter group link.

4. Choose the link to open the custom parameters associated with your Aurora PostgreSQL DB cluster.

5. In the Parameters search field, type shared_pre to find the shared_preload_libraries parameter.

6. Choose Edit parameters to access the property values.

7. Add pg_tle to the list in the Values field. Use a comma to separate items in the list of values.

   

8. Reboot the writer instance of your Aurora PostgreSQL DB cluster so that your change to the shared_preload_libraries parameter takes effect.

9. When the instance is available, verify that pg_tle has been initialized. Use psql to connect to the writer instance of your Aurora PostgreSQL DB cluster, and then run the following command.

   SHOW shared_preload_libraries;
   shared_preload_libraries 
   --------------------------
   rdsutils,pg_tle
   (1 row) 

10. With the pg_tle extension initialized, you can now create the extension.

    CREATE EXTENSION pg_tle;

    You can verify that the extension is installed by using the following psql metacommand.

    labdb=> \dx
                             List of installed extensions
      Name   | Version |   Schema   |                Description
    ---------+---------+------------+--------------------------------------------
     pg_tle  | 1.0.1   | pgtle      | Trusted-Language Extensions for PostgreSQL
     plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language

11. Grant the pgtle_admin role to the primary user name that you created for your Aurora PostgreSQL DB cluster when you set it up. If you accepted the default, it's postgres.

    labdb=> GRANT pgtle_admin TO postgres;
    GRANT ROLE

    You can verify that the grant has occurred by using the psql metacommand as shown in the following example. Only the pgtle_admin and postgres roles are shown in the output. For more information, see Understanding PostgreSQL roles and permissions.

    labdb=> \du
                              List of roles
        Role name    |           Attributes            |               Member of
    -----------------+---------------------------------+-----------------------------------
    pgtle_admin     | Cannot login                     | {}
    postgres        | Create role, Create DB          +| {rds_superuser,pgtle_admin}
                    | Password valid until infinity    |...

12. Close the psql session using the \q metacommand.

    \q

To get started creating TLE extensions, see Example: Creating a trusted language extension using SQL.

AWS CLI

You can avoid specifying the --region argument when you use CLI commands by configuring your AWS CLI with your default AWS Region. For more information, see Configuration basics in the AWS Command Line Interface User Guide.

To set up Trusted Language Extensions

1. Use the modify-db-parameter-group AWS CLI command to add pg_tle to the shared_preload_libraries parameter.

   aws rds modify-db-parameter-group \
      --db-parameter-group-name custom-param-group-name \
      --parameters "ParameterName=shared_preload_libraries,ParameterValue=pg_tle,ApplyMethod=pending-reboot" \
      --region aws-region

2. Use the reboot-db-instance AWS CLI command to reboot the writer instance of your Aurora PostgreSQL DB cluster and initialize the pg_tle library.

   aws rds reboot-db-instance \
       --db-instance-identifier writer-instance \
       --region aws-region

3. When the instance is available, you can verify that pg_tle has been initialized. Use psql to connect to the writer instance of your Aurora PostgreSQL DB cluster, and then run the following command.

   SHOW shared_preload_libraries;
   shared_preload_libraries 
   --------------------------
   rdsutils,pg_tle
   (1 row) 

   With pg_tle initialized, you can now create the extension.

   CREATE EXTENSION pg_tle;

4. Grant the pgtle_admin role to the primary user name that you created for your Aurora PostgreSQL DB cluster when you set it up. If you accepted the default, it's postgres.

   GRANT pgtle_admin TO postgres;
   GRANT ROLE

5. Close the psql session as follows.

   labdb=> \q

To get started creating TLE extensions, see Example: Creating a trusted language extension using SQL.