MYSQL高可用：（replication）

MYSQL高可用：
master MY.CNF
[mysqld]
tmpdir = /tmp
language =.../share/enlish
pid-file =.../run/master.pid
datadir =.../data
server-id = 1
port = 12000
log-bin = .../log/master-bin
socket = /tmp/master.sock
basedir = ...

slave MY.CNF
[mysqld]
tmpdir = /tmp
language =.../share/enlish
pid-file =.../run/master.pid
datadir =.../data
server-id = 2
port = 12001
socket = /tmp/mysqld.sock
basedir = ...
relay-log-index = ...
relay-log = ...

修改slave server_id:

show variables like 'server%';
set global server_id = 22;

确保master log——BIN是开启的
show variables like 'log%';
如果没有开启需要在MY.CNF文件中加入
log-bin=/opt/mysql5149/logbin.log
确保有日志目录有写的权限。

查看日志
show binary logs;
show variables like '%format%';
flush logs;
reset master; 初始化日志
? purge;查看某命令的使用方法
删除日志的方法：
purge binary or master logs to '1.00005';

创建用户并赋予权限；
create user [email protected] identified by 'what';
grant replication slave on *.* to [email protected];
show grants for [email protected];

备份主库：
flush tables with read lock;
show variables like 'datadir';
进入到数据库目录备份想要备份的库

mysqldump -uroot -p -B test | gzip > test.gz

拷贝到备库：
scp test.gz [email protected]:/sansom

恢复数据库为可写：
unlock tables;
show master status;

删除备库原有的数据库test
drop database test;
恢复数据库：
zcat ./test.gz | mysql -uroot -p

首先在主库执行查看POS 以及二进制日志的编号：
show master status;

在备库执行以下命令：
change master to master_host = '192.168.0.21',master_user='repl',master_password='what',master_log_file='logbin.000002',master_log_pos=308;

启动slave；
start slave；

检查slave工作状态；
show slave status\G
查看以下2部分是否为YES；
slave_IO_Running
Slave_SQL_Running