mysql双机热备的配置步骤

设置双机热备：

首先要在两台机器上建立同步用户：

grant replication slave on *.* to 'repdcs'@'192.168.21.39' identified by '123456';   

grant all privileges on *.* to 'repdcs'@'192.168.21.39  identified by '123456';

FLUSH PRIVILEGES;

grant replication slave on *.* to 'repdcs'@'192.168.21.106' identified by '123456';   

grant all privileges on *.* to 'repdcs'@'192.168.21.106 identified by '123456';

FLUSH PRIVILEGES;

库1

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

port=3306

# Default to using old password format for compatibility with mysql 3.x

# clients (those using the mysqlclient10 compatibility package).

old_passwords=1

lower_case_table_names=1

default-character-set=utf8

default-storage-engine=innodb

max_connect_errors = 100000

innodb_buffer_pool_size= 8G

max_connections = 500

default-character-set=utf8

 

server-id=2

#log-bin=mysqlbin

innodb_flush_log_at_trx_commit=1

sync_binlog=1

init_connect='SET NAMES utf8'

log-bin=mysqlbin

master-host=192.168.21.39

master-user=repdcs

master-pass=123456

master-connect-retry=60

replicate-do-db=dcs

master-port=3306

slave-net-timeout=60

库2

[mysqld]

#datadir=/var/lib/mysql

datadir=/home/data/mysql

#socket=/var/lib/mysql/mysql.sock

socket=/home/data/mysql/mysql.sock

user=mysql

port=3306

# Default to using old password format for compatibility with mysql 3.x

# clients (those using the mysqlclient10 compatibility package).

old_passwords=1

default-character-set=utf8

init_connect = 'SET NAMES utf8'

# Disabling symbolic-links is recommended to prevent assorted security risks;

# to do so, uncomment this line:

# symbolic-links=0

server-id=1

log-bin=mysqlbin

innodb_flush_log_at_trx_commit=1

sync_binlog=1

init_connect='SET NAMES utf8'

log-bin=mysqlbin

master-host=192.168.21.106

master-user=repdcs

master-pass=123456

master-connect-retry=60

replicate-do-db=dcs

master-port=3306

slave-net-timeout=60

#replicate-do-db=dcs

back_log = 512

key_buffer_size = 8M

max_allowed_packet = 4M

sort_buffer_size = 6M

read_buffer_size = 4M

join_buffer_size = 4M

myisam_sort_buffer_size = 64M

thread_cache_size = 64

query_cache_size = 0M

tmp_table_size = 96M

max_connections = 500

table_cache= 1024

innodb_additional_mem_pool_size= 16M

innodb_log_buffer_size= 64M

read_rnd_buffer_size= 16M

innodb_buffer_pool_size= 1G

innodb_log_file_size = 256M

max_heap_table_size = 96M

innodb_data_file_path = ibdata1:200M:autoextend

default-storage-engine=innodb

max_connect_errors = 100000

long_query_time = 1

 

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

 

[client]

default-character-set=utf8



标红的话主要两台机器的不同部分。



重新启动假设出问题

show slave status \G

Last_Error: Error 'Can't create database 'dcs'; database exists' on query. Default database: 'dcs'. Query: 'cr

查询从库发现须要建立的数据库已经存在,所以能够跳过这个建库的命令.

使用set global sql_slave_skip_counter=1;

start slave sql_thread;

flush privileges



server-id=n //设置数据库id默认主server是1能够随便设置可是假设有多台从server则不能反复。

master-host=192.168.21.39 //主server的IP地址或者域名

master-port=3306 //主数据库的端口号

master-user=repdcs //同步数据库的用户

master-password=123456 //同步数据库的密码

master-connect-retry=60 //假设从server发现主server断掉，又一次连接的时间差

report-host=db-slave.mycompany.com //报告错误的server

然后重新启动两个机器的数据库，基本就没问题了，大致步骤给主从差点儿相同，能够參考我的博客 mysql主从的參数配置与步骤