ERROR 2002 (HY000): Can't connect to MySQL server on code example

Example 1: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

sudo chown -R _mysql:mysql /usr/local/var/mysql

sudo mysql.server start

Example 2: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.s

> ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
> 
> service mysql start or service mysql start

Example 3: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

sudo /etc/init.d/mysql start

Example 4: ERROR 2002 (HY000): Can

# This is usually caused by the fact that the
# MySQL Server isn't even running
# On Windows, check your services, if its not running
# start it, or install and start it.

# On *nix, for this example Debian based
# Firstly see if it's even running
ps aux | grep mysql

# If you dont see any process other than your grep call,
# It's not running

# Assuming you have mysql-server installed
# Start it
sudo /etc/init.d/mysql start

# Otherwise install it, configure and start it up as above
sudo apt-get install mysql-server

# Goodbye 2002

Example 5: error 2002 (hy000): can't connect to local mysql server through socket '/var/run/mysqld/mysqld.sock' (2)

mysql -h 127.0.0.1 -P 3306 -u root -p <database>