#服务器规划： mysql1：192.168.2.153 mysql2：192.168.2.154 mysql-vip：192.168.2.157 #主主复制：

创建复制账号：主库：mysql> grant replication slave on . to repl@'192.168.2.%' identified by 'slave'; 备库：mysql> grant replication slave on . to repl@'192.168.2.%' identified by 'slave';
配置主库和备库:修改my.cnf

#mysql1 [mysqld] server-id = 26 port = 3306 user = mysql basedir = /mvtech/mysql datadir = /mvtech/mysql/data tmpdir = /mvtech/mysql/ socket = /mvtech/mysql/mysql.sock skip-external-locking skip-name-resolve lower_case_table_names=1 auto_increment_offset = 1 auto_increment_increment = 2 ########## binlog ########## log_bin = /mvtech/mysql/log/mysql-bin binlog_format = row binlog_cache_size = 2M expire-logs-days = 7 ########## error log ########## log_error = /mvtech/mysql/log/mysql-error.log ########## slow log ########## slow_query_log = 1 slow_query_log_file = /mvtech/mysql/log/mysql-slow.log long_query_time = 5 ########## per_thread_buffers ########## max_connections = 1024 max_connect_errors = 1000 key_buffer_size = 64M max_allowed_packet = 128M table_open_cache = 6144 table_definition_cache = 4096 sort_buffer_size = 512K read_buffer_size = 512K join_buffer_size = 512K tmp_table_size = 64M max_heap_table_size = 64M thread_cache_size = 64 thread_concurrency = 32 bulk_insert_buffer_size = 64M ########innodb######## innodb_data_file_path = ibdata1:76M;ibdata2:1G:autoextend innodb_buffer_pool_size = 30G innodb_log_file_size = 500M innodb_log_buffer_size = 64M innodb_flush_log_at_trx_commit = 2 innodb_file_per_table = 1 innodb_file_io_threads = 4 innodb_flush_method = O_DIRECT innodb_thread_concurrency = 0 innodb_additional_mem_pool_size = 16M [mysqlhotcopy] interactive-timeout [mysqld_safe] open_files_limit = 65535

mysql

1#mysql2：
2[mysqld]
3server-id = 27
4port = 3306
5user = mysql
6basedir = /mvtech/mysql
7datadir = /mvtech/mysql/data
8tmpdir = /mvtech/mysql/
9socket = /mvtech/mysql/mysql.sock
10skip-external-locking
11skip-name-resolve
12lower_case_table_names=1
13auto_increment_offset = 2
14auto_increment_increment = 2 
15########## binlog ##########
16log_bin = /mvtech/mysql/log/mysql-bin
17binlog_format = row
18binlog_cache_size = 2M
19expire-logs-days = 7
20########## error log ##########
21log_error = /mvtech/mysql/log/mysql-error.log
22########## slow log ##########
23slow_query_log = 1
24slow_query_log_file = /mvtech/mysql/log/mysql-slow.log
25long_query_time = 5
26########## per_thread_buffers ##########
27max_connections = 1024
28max_connect_errors = 1000
29key_buffer_size = 64M
30max_allowed_packet = 128M
31table_open_cache = 6144
32table_definition_cache = 4096
33sort_buffer_size = 512K
34read_buffer_size = 512K
35join_buffer_size = 512K
36tmp_table_size = 64M
37max_heap_table_size = 64M
38thread_cache_size = 64
39thread_concurrency = 32
40bulk_insert_buffer_size = 64M
41########innodb########
42innodb_data_file_path = ibdata1:76M;ibdata2:1G:autoextend
43innodb_buffer_pool_size = 30G
44innodb_log_file_size = 500M
45innodb_log_buffer_size = 64M
46innodb_flush_log_at_trx_commit = 2
47innodb_file_per_table = 1
48innodb_file_io_threads = 4
49innodb_flush_method = O_DIRECT
50innodb_thread_concurrency = 0
51innodb_additional_mem_pool_size = 16M
52[mysqlhotcopy]
53interactive-timeout
54[mysqld_safe]
55open_files_limit = 65535
56
57
58* 复制配置
59		登陆mysql1：查看show binary logs;
60		mysql2上操作：根据查询结果修改下面语句mysql2上操作：
61			CHANGE MASTER TO MASTER_HOST='192.168.2.153',
62			MASTER_USER='repl',
63			MASTER_PASSWORD='slave',
64			MASTER_LOG_FILE='mysql-bin.000006',
65			MASTER_LOG_POS=0;
66		查看状态：show slave status\G
67			Slave_IO_Running: No
68                Slave_SQL_Running: No
69
70		启动slave
71			start slave
72		查看mysql2状态：show slave status\G
73			Slave_IO_Running: Yes
74                Slave_SQL_Running: Yes
75		查看mysql2线程：
76		show processlist\G
77		登陆mysql2：
78		查看show binary logs;
79		mysql> show binary logs;
80		+------------------+-----------+
81		| Log_name         | File_size |
82		+------------------+-----------+
83		| mysql-bin.000001 |       143 |
84		| mysql-bin.000002 | 229383637 |
85		| mysql-bin.000003 |       120 |
86		+------------------+-----------+
87		3 rows in set (0.00 sec)		
88
89
90		mysql1操作：
91			CHANGE MASTER TO MASTER_HOST='192.168.2.154',
92			MASTER_USER='repl',
93			MASTER_PASSWORD='slave',
94			MASTER_LOG_FILE='mysql-bin.000003',
95			MASTER_LOG_POS=120;	
96		启动slave
97			start slave
98		查看mysql1状态：show slave status\G
99			Slave_IO_Running: Yes
100            Slave_SQL_Running: Yes
101		查看mysql1线程：
102		show processlist\G

#keepalived配置：

1* mysql1：keepalived.conf
2! Configuration File for keepalived
3
4global_defs {
5    router_id LVS_DEVEL
6}
7
8vrrp_instance VI_1 {
9    state BACKUP 
10    interface em1
11    virtual_router_id 61
12    priority 100
13    advert_int 1
14    nopreempt
15    authentication {
16        auth_type PASS
17        auth_pass 1111
18    }
19    virtual_ipaddress {
20        192.168.2.157
21    }
22}
23
24virtual_server 192.168.2.157 3306 {
25    delay_loop 2
26    lb_algo wrr
27    lb_kind DR 
28    nat_mask 255.255.255.0
29    persistence_timeout 50
30    protocol TCP
31
32    real_server 192.168.2.153 3306 {
33        weight 3
34        notify_down /mvtech/mysql/keepalive-mysql.sh
35	TCP_CHECK {
36            connect_timeout 3
37            nb_get_retry 3
38            delay_before_retry 3
39            connect_port 3306
40        }
41    }
42}
43
44
45
46* mysql2：keepalived.conf
47! Configuration File for keepalived
48
49global_defs {
50    router_id LVS_DEVEL
51}
52
53vrrp_instance VI_1 {
54    state BACKUP 
55    interface em1
56    virtual_router_id 61
57    priority 90
58    advert_int 1
59    nopreempt
60    authentication {
61        auth_type PASS
62        auth_pass 1111
63    }
64    virtual_ipaddress {
65        192.168.2.157
66    }
67}
68
69virtual_server 192.168.2.157 3306 {
70    delay_loop 2
71    lb_algo wrr
72    lb_kind DR 
73    nat_mask 255.255.255.0
74    persistence_timeout 50
75    protocol TCP
76
77    real_server 192.168.2.154 3306 {
78        weight 3
79        notify_down /mvtech/mysql/keepalive-mysql.sh
80	TCP_CHECK {
81            connect_timeout 3
82            nb_get_retry 3
83            delay_before_retry 3
84            connect_port 3306
85        }
86    }
87}
88
89
90
91#keepalive-mysql.sh
92#!/usr/bin/env bash
93service keepalived stop

服务启动

启动 1.启动mysql1上的mysql；登陆查看mysql-slave状态:show slave status\G；启动slave:start slave; 2.启动mysql2上的mysql；登陆查看mysql-slave状态:show slave status\G;启动slave:start slave; 3.启动mysql1上的keepalived；查看vip状态：ip addr 4.启动mysql2上的keepalived。
关闭 1.查看vip漂在那台机器上，例如：在mysql1上； 2.关闭mysql2的keepalived； 3.关闭mysql1的keepalived； 4.关闭mysql1上的mysql； 5.关闭mysql2上的mysql。

keepalived模拟切换

关闭mysql1上的mysql，vip漂至mysql2主机上；
启动mysql1上的mysql同时启动keepalived，vip不漂回mysql1主机上，这是由于keepalive.conf 配置文件中将两台机器都设为backup，并增加nopreempt，此模式为不抢占模式。避免高并发网站频繁切换造成数据库数据不一致问题。

#mysql主主复制测试 mysql1和mysql2上均新建数据库，检查同步现象 #取消主主复制

1mysql> show slave status\G
2mysql> stop slave IO_THREAD;
3mysql> stop slave;
4mysql> reset master;
5mysql> show slave status\G
6mysql> reset slave all;

mysql主主复制+keepalived故障切换

服务启动

keepalived模拟切换

此时丛库已恢复至单机状态。

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