同一主机开启多个MySQL端口需要注意的设置

[mysqld_multi]

mysqld = /usr/local/mysql/bin/mysqld_safe

mysqladmin = /usr/local/mysql/bin/mysqladmin

user = _mysql

[mysqld1]

user = _mysql

basedir = /usr/local/mysql

datadir = /usr/local/mysql/data

innodb_data_home_dir = /usr/local/mysql/data

log-error = /usr/local/mysql/data/error_log.log

tmpdir = /tmp

pid-file = mysqld1.pid

socket = /tmp/mysql.sock

port = 3306

server_id = 1

log-bin = mysql-bin

binlog-format = mixed

innodb_buffer_pool_size = 8M

innodb_data_file_path=ibdata1:50M;ibdata2:50M:autoextend

上以设置中，带路径的选项都是需要注意的内容。特别需要注意的内容是：innodb_data_home_dir 和 port, socket，server_id 千万不能重复。

如果 innodb_buffer_pool_size 的大小设置得太大，会造成MySQL无法启动。