[root@datanode01 bin]# /usr/local/mysql/bin/mysqladmin -u root password 'root'
/usr/local/mysql/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists!
解决:
ln -s /usr/local/mysql/mysql.sock /tmp/mysql.sock 

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