Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

設定MySQL on Fedora時候，當mysql.sock不存在時，嘗試登入mysql root(mysql -u root -p)時候會出現：

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'(2)

 即使touch該檔案(sudo touch /var/lib/mysql/mysql.sock)還是會出現：

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'(111)

其實問題出在沒有啟動mysql，故需要以下指令即可：

sudo /etc/init.d/mysqld start