Laravel Error - No supported encrypter found. The cipher and / or key length are invalid.

While running  composer install or php artisan optimize, If you get this error, here is the solution.

Solution :

Change values in config/app.php

'cipher' => 'AES-256-CBC',
to
'cipher' => MCRYPT_RIJNDAEL_128,

Now run again composer install or php artisan optimize , you will not get the same error again.

AWS RDS - Create mysql user with superuser Privileges

Login as super user on command prompt.

Run following query to create user.

CREATE USER 'username'@'%' IDENTIFIED BY 'password';

Just change username and password in above query and execute as root user. A new user will be created.

Now give super user privileges to new user.

GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER ON *.* TO 'username'@'%' WITH GRANT OPTION;

Just change username in above query. Your new created user will be a super user now.

AWS RDS - Give Superuser Privileges to Regular mysql User

Login as super user on command prompt.

Run following query to give superuser privileges to normal user.

GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER ON *.* TO 'username'@'%' WITH GRANT OPTION;

Just change username in above query and execute as root user. Your regular user will be a super user now.