Open EC2 Cloud9
$ sudo service mysqld start
$ /usr/libexec/mysql55/mysql_secure_installation
comment - if first time Set root password? [Y/n] $ Y
Remove anonymous users? [Y/n] $ Y
Disallow root login remotely? [Y/n] $ Y
Remove test database and access to it? [Y/n] $ Y
Reload privilege tables now? [Y/n] $ Y
$ mysql -uroot -p
ERROR - ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Multiple mysql processes were running concurrently. First kill the processes with:
sudo pkill mysql or sudo pkill mysqld
restart mysql sudo service mysql restart or sudo service mysqld start
login again mysql -u root -p