Mysql 5.7双主复制

软件：

主机A IP：192.168.1.201主机B IP：192.168.1.202操作系统：centos6.5-x86
Mysql版本：mysql-5.7.12-linux-glibc2.5-x86_64.tar.gz
安装依赖包：yum install libaio-devel glibc perl –y

关闭SElinux及IPtables：
/etc/init.d/iptables stop && setenforce 0 && sed –I ‘s/SELINUX=enforcing/SELINUX=disabled/’ /etc/selinux/config

一、Mysql安装配置

[b]■1.Mysql安装[/b]
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groupadd mysql
useradd -g mysql -s /sbin/nologin  -M mysql
tar xf mysql-5.7.12-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.7.12-linux-glibc2.5-x86_64 /usr/local/mysql
mkdir /usr/local/mysql/datachown -R root:mysql /usr/local/mysql/
chown -R  mysql:mysql /usr/local/mysql/data/
> /etc/my.cnf
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

[b]■2.配置Mysql[/b]
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vim /etc/init.d/mysqld
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data

================================
vim /etc/my.cnf

[mysqld]
########basic settings########
server-id = 1    #另一台ID不同
port = 3306
user = mysql
bind_address = 192.168.1.201    #另一台IP不用
autocommit = 0
character_set_server=utf8mb4
skip_name_resolve = 1
max_connections = 800
max_connect_errors = 1000
datadir = /usr/local/mysql/data
transaction_isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
join_buffer_size = 134217728
tmp_table_size = 67108864
tmpdir = /tmp
max_allowed_packet = 16777216
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
interactive_timeout = 1800
wait_timeout = 1800
read_buffer_size = 16777216
read_rnd_buffer_size = 33554432
sort_buffer_size = 33554432
########log settings########
log_error = error.log
slow_query_log = 1
slow_query_log_file = slow.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 90
long_query_time = 2
min_examined_row_limit = 100
########replication settings########
master_info_repository = TABLE
relay_log_info_repository = TABLE
log_bin = bin.log
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = row
relay_log = relay.log
relay_log_recovery = 1
binlog_gtid_simple_recovery = 1
slave_skip_errors = all
# slave
slave-parallel-type = LOGICAL_CLOCK
slave-parallel-workers = 0
#slave-parallel-workers = 16
########innodb settings########
innodb_buffer_pool_size = 750M //内存的75%比较合适
innodb_buffer_pool_instances = 16
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 2000
innodb_lock_wait_timeout = 10000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_method = O_DIRECT
innodb_flush_neighbors = 1
innodb_log_file_size = 4G
innodb_log_buffer_size = 16777216
innodb_purge_threads = 4
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 67108864
innodb_flush_log_at_trx_commit = 2
innodb_read_io_threads = 16
innodb_write_io_threads = 16
########semi sync replication settings########
plugin_dir=/usr/local/mysql/lib/plugin
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_slave_enabled = 1
loose_rpl_semi_sync_master_timeout = 5000
[mysqld-5.7]
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 4
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128
binlog_gtid_simple_recovery=1
log_timestamps=system
transaction_write_set_extraction=MURMUR32
show_compatibility_56=on

[b]■3.初始化目录[/b]
[b]5.7已经不用mysql_install_db初始化了，已经改成下面这个命令了
[/b]
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/usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --initialize
/etc/init.d/mysqld start

[b]■4.设置密码[/b]
5.7比较讨厌，初始密码不为空了，也可以说安全性更高了。
初始化密码在初始化日志里
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grep "temporary password" /usr/local/mysql/data/error.log
2016-07-04T09:50:17.455227+08:00 1 [Note] A temporary password is generated for root@localhost: wLEM;g+?&1eF
/usr/local/mysql/bin/mysql -uroot -p
#输入日志里的密码
mysql> alter user 'root'@'localhost' identified by '123456';
mysql> flush privileges;

#修改密码
[b]■5.设置数据同步[/b]

[b]#两台Mysql同时添加同步用户[/b]

mysql> create user 'repl'@'192.168.1.%' identified by '123456';
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.1.%';
mysql> flush privileges;

锁一下表，追平两台机器数据，然后解锁。

先看看GTID是否打开

mysql> show global variables like '%gtid%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| enforce_gtid_consistency | ON    |
| gtid_executed            |       |
| gtid_mode                | ON    |
| gtid_owned               |       |
| gtid_purged              |       |
+--------------------------+-------+
5 rows in set (0.10 sec)

#说明gtid功能已启动。GTID同步数据不用再记录对方的log文件和位置了，用master_auto_position=1就行，不过你用老的方法查看master的logfile和logpos，同步也是可以的。

#在两台Mysql上都运行，IP得互指
mysql> change master to master_host='192.168.1.201', master_user='repl',master_password='123456',master_auto_position=1;

mysql> start slave;
show slave status\G ;
#表示同步的文件和位置
Master_Log_File:
Read_Master_Log_Pos: 4
#显示下面表示工作正常
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
#表示当前同步的数据库
Replicate_Do_DB: nzabbix,szabbix

错误一：
mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
解决方法：

mysql> reset slave;
错误二：
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).
解决方法：
修改my.cnf配置文件中，slave_skip_errors = all