多主一从配置相关问题

主库配置请参考主从同步配置；

从库my.cnf相关配置：

[client]

#password = your_password

#port = 3306

#socket = /tmp/mysql.sock

[mysqld_multi]

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

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

[mysqld1]

port = 3306

socket = /tmp/mysql1.sock

datadir =/home/mysql/data1

log-error = /home/mysql/logs/mysql1_error.log

skip-external-locking

key_buffer_size = 16M

max_allowed_packet = 1M

table_open_cache = 64

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

thread_cache_size = 8

query_cache_size = 8M

tmp_table_size = 16M

#skip-networking

max_connections = 500

max_connect_errors = 100

open_files_limit = 65535

log-bin=mysql-bin

binlog_format=mixed

server-id = 20

expire_logs_days = 10

default_storage_engine = InnoDB

innodb_data_home_dir =/home/mysql/data1

innodb_data_file_path = ibdata1:10M:autoextend

innodb_log_group_home_dir =/home/mysql/data1

innodb_buffer_pool_size = 16M

innodb_additional_mem_pool_size = 2M

innodb_log_file_size = 5M

innodb_log_buffer_size = 8M

innodb_flush_log_at_trx_commit = 1

innodb_lock_wait_timeout = 50

[mysqld2]

port = 3307

socket =/tmp/mysql2.sock

datadir = /home/mysql/data2

log-error = /home/mysql/logs/mysql2_error.log

skip-external-locking

key_buffer_size = 16M

max_allowed_packet = 1M

table_open_cache = 64

sort_buffer_size = 512K

net_buffer_length = 8K

read_buffer_size = 256K

read_rnd_buffer_size = 512K

myisam_sort_buffer_size = 8M

thread_cache_size = 8

query_cache_size = 8M

tmp_table_size = 16M

#skip-networking

max_connections = 500

max_connect_errors = 100

open_files_limit = 65535

log-bin=mysql-bin

binlog_format=mixed

server-id = 40

expire_logs_days = 10

default_storage_engine = InnoDB

innodb_data_home_dir = /home/mysql/data2

innodb_data_file_path = ibdata1:10M:autoextend

innodb_log_group_home_dir = /home/mysql/data2

innodb_buffer_pool_size = 16M

innodb_additional_mem_pool_size = 2M

innodb_log_file_size = 5M

innodb_log_buffer_size = 8M

innodb_flush_log_at_trx_commit = 1

innodb_lock_wait_timeout = 50

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

no-auto-rehash

[myisamchk]

key_buffer_size = 20M

sort_buffer_size = 20M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

mysql1:

/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/home/mysql/data1/ --user=mysql

mysql2:

/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/home/mysql/data2/ --user=mysql

启动：

/usr/local/mysql/bin/mysqld_multi --config-file=/etc/my.cnf start 1-2

或

/usr/local/mysql/bin/mysqld_multi start 1-2

启动后：

lsof -i:3306

lsof -i:3307

两个端口都有mysql在监听的话就表示启动成功了

分别访问mysql实例1，实例2

# /usr/local/mysql/bin/mysql -uroot -p123456 -P3306 -S /tmp/mysql1.sock

# /usr/local/mysql/bin/mysql -uroot -p123456 -P3307 -S /tmp/mysql2.sock

分别访问两个实例，删除多余用户，修改用户密码，修改用户的访问权限