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MySQL5.7.24 Gtid+MGR
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由于服务器的资源有限，本次测试采用的是1台机器测试：
一台硬件物理机器：16G内存，一块120G的ssd盘 系统是CentOS6.9 x86_64最小化安装
系统内核：
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-696.el6.x86_64 #1 SMP Tue Mar 21 19:29:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux关闭selinux,关闭iptables
服务部署规划说明：
物理机器上以不同的mysql配置文件my.cnf来初始化mysql ，并且以三个不同的端口和添加MGR的配置参数来开启3个MySQL实例
mysql的版本为mysql5.7.24 二进制安装
第一，物理机器上开启三个mysql5.7.24 实例：
初始化mysql
下载软件：
wget https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz
tar xf mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz -C /usr/local
mv /usr/local/mysql-5.7.24-linux-glibc2.12 /usr/local/mysql
useradd mysql -s /sbin/nologin -M
chown -R mysql.mysql /usr/local/mysql
yum install numactl -y创建MySQL初始化数据存放路径：
mkdir -p /home/mysql3306/{data,binlog,logs}
mkdir -p /home/mysql3307/{data,binlog,logs}
mkdir -p /home/mysql3308/{data,binlog,logs}
chown -R mysql.mysql /home/{mysql3306,mysql3307,mysql3308}准备初始化mysql的my.cnf的配置文件：
[root@localhost ~]# ll /opt/my330*
-rw-r--r-- 1 root root 9227 12月 26 18:11 /opt/my3306.cnf
-rw-r--r-- 1 root root 9294 12月 27 18:09 /opt/my3307.cnf
-rw-r--r-- 1 root root 9294 12月 27 18:10 /opt/my3308.cnf
[root@localhost ~]# mysql5.7.17开始引入mysql的MGR特性简单介绍MySQL5.7开启Gtid+MGR特性的参数说明：
此次演示环境以mysql3306实例作为第一个MGR的启动实例，
MySQL5.7开启Gtid+MGR特性my3306cnf配置文件必须开启参数如下：
server_id =1
socket =/tmp/mysql3306.sock
##:for binlog
binlog_format =row
log_bin =/home/mysql3306/binlog/mysql-bin
binlog_checksum=NONE
log_slave_updates=ON
##:for gtid
#gtid_executed_compression_period =1000
gtid_mode =on
enforce_gtid_consistency =on
####for group_replication
master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE
log_slave_updates=ON
transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="3db33b36-0e51-409f-a61d-c99756e90155" ##格式要和server-uuid一致，但是不能和机器上mysql实例的uuid重复
loose-group_replication_start_on_boot=off ##禁止在重启mysql服务时开启组复制
loose-group_replication_local_address= "192.168.1.233:33061" #####端口随便指定一个，但是不要和机上其他服务的端口冲突就行，告诉插件本机使用网络地址192.168.1.233和端口33061与组中的其他成员进行内部通信。
loose-group_replication_group_seeds= "192.168.1.233:33061,192.168.1.233:33071,192.168.1.233:33081"
loose-group_replication_ip_whitelist="192.168.1.233/24" ##此处必须设置ip白名单，否则在开启MGR时，会报错。
loose-group_replication_bootstrap_group= off ##
##loose-group_replication_single_primary_mode=off ##在配置MGR的mutl-master模式时开启
##loose-group_replication_enforce_update_everywhere_checks=on ##在配置MGR的mutl-master模式时开启
my3307.cnf配置文件和my3306.cnf中不同的是把loose-group_replication_local_address修改为 "192.168.1.233:33071"
my3308.cnf配置文件和my3306.cnf中不同的是把loose-group_replication_local_address修改为 "192.168.1.233:33081"启动mysql实例：
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3306.cnf --initialize
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3307.cnf --initialize
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3308.cnf --initialize为了在配置MGR的过程中防止出错，在启动mysql之前把auto.cnf 修改为3个不相同的uuid
[root@localhost ~]# cat /home/mysql3306/data/auto.cnf
[auto]
server-uuid=1ec3ac79-08ed-11e9-8da8-bcaec502b368
[root@localhost ~]# cat /home/mysql3307/data/auto.cnf
[auto]
server-uuid=288e7bbe-08f3-11e9-a605-bcaec502b311
[root@localhost ~]# cat /home/mysql3308/data/auto.cnf
[auto]
server-uuid=883c9421-08f5-11e9-8d47-bcaec502b333启动mysql服务：
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3306.cnf &
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3307.cnf &
/usr/local/mysql/bin/mysqld --defaults-file=/opt/my3308.cnf &第二.开启MGR配置过程(默认是single-master模式)：
mysql3306作为第一个节点开启MGR:
SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'Zykjwujianwei';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='Zykjwujianwei' FOR CHANNEL 'group_replication_recovery';
install PLUGIN group_replication SONAME 'group_replication.so';
set global group_replication_bootstrap_group=ON;
start group_replication;
select * from performance_schema.replication_group_members;注意：只有在第一个开启MGR的mysql3306节点上才执行这个参数set global group_replication_bootstrap_group=ON;
root@localhost [(none)]>select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| group_replication_applier | 1ec3ac79-08ed-11e9-8da8-bcaec502b368 | localhost.localdomain | 3306 | ONLINE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
3 rows in set (0.00 sec)
root@localhost [(none)]>查看当前的leader：
select *from performance_schema.replication_group_members where member_id =(select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member');
select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member'；节点mysql3307操作：
SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'Zykjwujianwei';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='Zykjwujianwei' FOR CHANNEL 'group_replication_recovery';
install PLUGIN group_replication SONAME 'group_replication.so';
start group_replication;
select * from performance_schema.replication_group_members;
root@localhost [(none)]>select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| group_replication_applier | 1ec3ac79-08ed-11e9-8da8-bcaec502b368 | localhost.localdomain | 3306 | ONLINE |
| group_replication_applier | 288e7bbe-08f3-11e9-a605-bcaec502b311 | localhost.localdomain | 3307 | ONLINE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+节点mysql3308操作：
SET SQL_LOG_BIN=0;
CREATE USER rpl_user@'%';
GRANT REPLICATION SLAVE ON *.* TO rpl_user@'%' IDENTIFIED BY 'Zykjwujianwei';
FLUSH PRIVILEGES;
SET SQL_LOG_BIN=1;
CHANGE MASTER TO MASTER_USER='rpl_user', MASTER_PASSWORD='Zykjwujianwei' FOR CHANNEL 'group_replication_recovery';
install PLUGIN group_replication SONAME 'group_replication.so';
start group_replication;
select * from performance_schema.replication_group_members;
root@localhost [(none)]>select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| group_replication_applier | 1ec3ac79-08ed-11e9-8da8-bcaec502b368 | localhost.localdomain | 3306 | ONLINE |
| group_replication_applier | 288e7bbe-08f3-11e9-a605-bcaec502b311 | localhost.localdomain | 3307 | ONLINE |
| group_replication_applier | 883c9421-08f5-11e9-8d47-bcaec502b333 | localhost.localdomain | 3308 | ONLINE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
3 rows in set (0.00 sec)第三.测试效果：
root@localhost [(none)]>select @@port;create database test01;show databases;
+--------+
| @@port |
+--------+
| 3306 |
+--------+
1 row in set (0.00 sec)
Query OK, 1 row affected (0.00 sec)
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test01 |
+--------------------+
5 rows in set (0.00 sec)
root@localhost [(none)]>select @@port;create database test02;show databases;
+--------+
| @@port |
+--------+
| 3307 |
+--------+
1 row in set (0.00 sec)
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test01 |
+--------------------+
5 rows in set (0.00 sec)
root@localhost [(none)]>
root@localhost [(none)]>select @@port;create database test02;show databases;
+--------+
| @@port |
+--------+
| 3308 |
+--------+
1 row in set (0.00 sec)
ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test01 |
+--------------------+
5 rows in set (0.00 sec)
root@localhost [(none)]>测试说明：
发现mysql3306上创建的test01同步到了其他的2个mysql。然而在MGR组中mysql3307 和mysql3308是只读，不能写入的。
关掉mysql3306服务会发生什么？？ 直接会从mysql3307和mysql3308实例中选择一个作为mysql主库，另外一个作为新主库的slave库
关掉mysql3306服务一段时间后，有重新开启mysql3306，并且start group_replication;重新加入到MGR组会发生什么？？
此时mysql3306不会切换为master库，而是成为了宕机后新主库的slave库。
MGR默认的模式也就是咱们演示的single-master模式（单主写入模式）。那如何开启mysql的mult-master多主写入的模式呢？？下面简单介绍下：
首先要先关闭只读的从库mysql3307和mysql3308实例最后关闭mysql3306
其次在各自的my.cnf配置文件中开启如下参数：
loose-group_replication_single_primary_mode=off ##在配置MGR的mutl-master模式时开启
loose-group_replication_enforce_update_everywhere_checks=on ##在配置MGR的mutl-master模式时开启 最后启动mysql实例，按照配置MGR-single-master的顺序步骤来进行配置MGR的multi-master模式
特别提示：
multi-master模式下，3个节点mysql实例都是可读写的。但是在第一个启动的mysql实例上需要执行set global group_replication_bootstrap_group=ON;（注意：后面的节点不需要执行这个sql）
mysql5.7 开启MGR multi-master模式后，查看实例的状态发现不存在所谓的leader
(root@localhost:mysql.sock)[(none)]>select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
| group_replication_applier | 862addac-10c5-11e9-9af5-bcaec502b317 | localhost.localdomain | 3307 | ONLINE |
| group_replication_applier | a36b8f24-10c3-11e9-bf76-bcaec502b318 | localhost.localdomain | 3308 | ONLINE |
| group_replication_applier | da3809c4-10bc-11e9-bb9e-bcaec502b368 | localhost.localdomain | 3306 | ONLINE |
+---------------------------+--------------------------------------+-----------------------+-------------+--------------+
3 rows in set (0.00 sec)
(root@localhost:mysql.sock)[(none)]>select *from performance_schema.replication_group_members where member_id =(select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member');
Empty set (0.00 sec)
(root@localhost:mysql.sock)[(none)]>select variable_value from performance_schema.global_status WHERE VARIABLE_NAME= 'group_replication_primary_member';
+----------------+
| variable_value |
+----------------+
| |
+----------------+
1 row in set (0.00 sec)mysql3307完整的配置文件如下：
[root@localhost ~]# cat /opt/my3307.cnf
[client]
port = 3307
[mysql]
auto-rehash
prompt="\u@\h [\d]>"
#pager="less -i -n -S"
#tee=/opt/mysql/query.log
[mysqld]
####: for global
user =mysql
basedir =/usr/local/mysql/
datadir =/home/mysql3307/data
server_id =2
port =3307
character_set_server =utf8
explicit_defaults_for_timestamp =off
log_timestamps =system
socket =/tmp/mysql3307.sock
read_only =0
skip_name_resolve =1
auto_increment_increment =1
auto_increment_offset =1
lower_case_table_names =1
secure_file_priv =
open_files_limit =65536
max_connections =1000
thread_cache_size =64
table_open_cache =81920
table_definition_cache =4096
table_open_cache_instances =64
max_prepared_stmt_count =1048576
####: for binlog
binlog_format =row
log_bin =/home/mysql3307/binlog/mysql-bin
binlog_rows_query_log_events =on
#log_slave_updates =on
expire_logs_days =7
binlog_cache_size =65536
#binlog_checksum =none
sync_binlog =1
slave-preserve-commit-order =ON
####: for error-log
log_error =/home/mysql3307/logs/error.log
general_log =off
general_log_file =/home/mysql3307/logs/general.log
####: for slow query log
slow_query_log =on
slow_query_log_file =/home/mysql3307/logs/slow.log
#log_queries_not_using_indexes =on
long_query_time =1.000000
####: for gtid
#gtid_executed_compression_period =1000
gtid_mode =on
enforce_gtid_consistency =on
####: for replication
skip_slave_start =1
#master_info_repository =table
#relay_log_info_repository =table
slave_parallel_type =logical_clock
slave_parallel_workers =4
#rpl_semi_sync_master_enabled =1
#rpl_semi_sync_slave_enabled =1
#rpl_semi_sync_master_timeout =1000
#plugin_load_add =semisync_master.so
#plugin_load_add =semisync_slave.so
binlog_group_commit_sync_delay =100
binlog_group_commit_sync_no_delay_count = 10
####for group_replication
master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE
log_slave_updates=ON
transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="3db33b36-0e51-409f-a61d-c99756e90155"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.1.233:33071"
loose-group_replication_group_seeds= "192.168.1.233:33061,192.168.1.233:33071,192.168.1.233:33081"
loose-group_replication_ip_whitelist="192.168.1.233/24"
##loose-group_replication_single_primary_mode=off ##在配置MGR的mutl-master模式时开启
##loose-group_replication_enforce_update_everywhere_checks=on ##在配置MGR的mutl-master模式时开启
####: for innodb
default_storage_engine =innodb
default_tmp_storage_engine =innodb
innodb_data_file_path =ibdata1:1024M:autoextend
innodb_temp_data_file_path =ibtmp1:12M:autoextend
innodb_buffer_pool_filename =ib_buffer_pool
innodb_log_group_home_dir =/home/mysql3307/data
innodb_log_files_in_group =3
innodb_log_file_size =1024M
innodb_file_per_table =on
innodb_online_alter_log_max_size =128M
innodb_open_files =65535
innodb_page_size =16k
innodb_thread_concurrency =0
innodb_read_io_threads =4
innodb_write_io_threads =4
innodb_purge_threads =4
innodb_page_cleaners =4
# 4(刷新lru脏页)
innodb_print_all_deadlocks =on
innodb_deadlock_detect =on
innodb_lock_wait_timeout =20
innodb_spin_wait_delay =128
innodb_autoinc_lock_mode =2
innodb_io_capacity =200
innodb_io_capacity_max =2000
#--------Persistent Optimizer Statistics
innodb_stats_auto_recalc =on
innodb_stats_persistent =on
innodb_stats_persistent_sample_pages =20
innodb_adaptive_hash_index =on
innodb_change_buffering =all
innodb_change_buffer_max_size =25
innodb_flush_neighbors =1
#innodb_flush_method =
innodb_doublewrite =on
innodb_log_buffer_size =128M
innodb_flush_log_at_timeout =1
innodb_flush_log_at_trx_commit =1
innodb_buffer_pool_size =4096M
innodb_buffer_pool_instances =4
autocommit =1
#--------innodb scan resistant
innodb_old_blocks_pct =37
innodb_old_blocks_time =1000
#--------innodb read ahead
innodb_read_ahead_threshold =56
innodb_random_read_ahead =OFF
#--------innodb buffer pool state
innodb_buffer_pool_dump_pct =25
innodb_buffer_pool_dump_at_shutdown =ON
innodb_buffer_pool_load_at_startup =ON 到此处mysql5.7.24的Grid+MGR模式演示完毕
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