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这次给大家介绍下MySQL官方最新版本5.7.17中GA的新功能 Group Replication 。
最后，组复制是一种无共享复制方案，其中每个服务器都有自己的整个数据副本。
上图描述了MySQL组复制协议，并通过将其与MySQL复制（或甚至MySQL半同步复制）进行比较，您可以看到一些差异。注意，为了清楚起见，这个图片中缺少一些基本的共识和Paxos相关消息。
介绍就到这，本文中我将一步一步的安装部署group_replication的三个节点，并让你看到它的功能和特性，如果看完全文，你十分的感兴趣的话，可以去mysql的Group Replication主页去查看更详细的信息。
basedir = /usr/local/mysql
(PS: 这点还是要吐槽一下的，mysql官方basedir如果不在这个目录的话，mysql.server也不好使，这个实验也不成功，我们还是勉强先放在这)
| 端口号 | 数据及日志目录 | Group_Replication通讯端口 |
| 3306 | /data/mysql/mysql_3306/{data,logs,tmp} | 33061 |
| 3307 | /data/mysql/mysql_3307/{data,logs,tmp} | 33062 |
| 3308 | /data/mysql/mysql_3308/{data,logs,tmp} | 33063 |
①、下载and解压缩，并把mysql放到指定地方（标准目录： /usr/local/mysql）
cd /opt/ wget https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz mv mysql-5.7.26-linux-glibc2.12-x86_64 /usr/local/mysql
②、 创建数据库需要的数据、日志和临时目录并赋权：
mkdir -p /data/mysql/{mysql_3306,mysql_3307,mysql_3308}/{data,logs,tmp} chown -R mysql.mysql /data/mysql/
安装机器： 192.168.0.162 （单机多实例安装）
配置文件说明：
| 端口号 | 配置文件 |
| 3306 | /data/mysql/mysql_3306/my3306.cnf |
| 3307 | /data/mysql/mysql_3306/my3307.cnf |
| 3308 | /data/mysql/mysql_3306/my3308.cnf |
[client] port = 3306 socket = /tmp/mysql3306.sock [mysql] prompt = mysql [\d]> default_character_set = utf8 no-auto-rehash [mysqld] #misc user = mysql basedir = /usr/local/mysql datadir = /data/mysql/mysql_3306/data port = 3306 socket = /tmp/mysql3306.sock event_scheduler = 0 tmpdir=/data/mysql/mysql_3306/tmp #timeout interactive_timeout = 43200 wait_timeout = 43200 #character set character-set-server = utf8 open_files_limit = 65535 max_connections = 100 max_connect_errors = 100000 # explicit_defaults_for_timestamp #logs log-output=file slow_query_log = 1 slow_query_log_file = slow.log log-error = error.log log_error_verbosity=3 pid-file = mysql.pid long_query_time = 1 #log-slow-admin-statements = 1 #log-queries-not-using-indexes = 1 log-slow-slave-statements = 1 #binlog binlog_format = row server-id = 1343306 log-bin = /data/mysql/mysql_3306/logs/mysql-bin binlog_cache_size = 1M max_binlog_size = 200M max_binlog_cache_size = 2G sync_binlog = 0 expire_logs_days = 10 #group replication server_id=1013306 gtid_mode=ON enforce_gtid_consistency=ON master_info_repository=TABLE relay_log_info_repository=TABLE binlog_checksum=NONE log_slave_updates=ON binlog_format=ROW transaction_write_set_extraction=XXHASH64 loose-group_replication_group_name="13855fca-d2ab-11e6-8f37-005056b8286c" loose-group_replication_start_on_boot=off loose-group_replication_local_address= "192.168.0.162:33061" loose-group_replication_group_seeds= "192.168.0.162:33061,192.168.0.162:33071,192.168.0.162:33081" loose-group_replication_bootstrap_group= off loose-group_replication_single_primary_mode=off loose-group_replication_enforce_update_everywhere_checks=on #relay log skip_slave_start = 1 max_relay_log_size = 500M relay_log_purge = 1 relay_log_recovery = 1 #slave-skip-errors=1032,1053,1062 #buffers & cache table_open_cache = 2048 table_definition_cache = 2048 table_open_cache = 2048 max_heap_table_size = 96M sort_buffer_size = 2M join_buffer_size = 2M thread_cache_size = 256 query_cache_size = 0 query_cache_type = 0 query_cache_limit = 256K query_cache_min_res_unit = 512 thread_stack = 192K tmp_table_size = 96M key_buffer_size = 8M read_buffer_size = 2M read_rnd_buffer_size = 16M bulk_insert_buffer_size = 32M #myisam myisam_sort_buffer_size = 128M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 #innodb innodb_buffer_pool_size = 500M innodb_buffer_pool_instances = 1 innodb_data_file_path = ibdata1:100M:autoextend innodb_flush_log_at_trx_commit = 2 innodb_log_buffer_size = 64M innodb_log_file_size = 256M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 90 innodb_file_per_table = 1 innodb_rollback_on_timeout innodb_status_file = 1 innodb_io_capacity = 2000 transaction_isolation = READ-COMMITTED innodb_flush_method = O_DIRECT
#group replication server_id=1013306 gtid_mode=ON enforce_gtid_consistency=ON master_info_repository=TABLE relay_log_info_repository=TABLE binlog_checksum=NONE log_slave_updates=ON binlog_format=ROW transaction_write_set_extraction=XXHASH64 loose-group_replication_group_name="13855fca-d2ab-11e6-8f37-005056b8286c" loose-group_replication_start_on_boot=off loose-group_replication_local_address= "192.168.0.162:33061" loose-group_replication_group_seeds= "192.168.0.162:33061,192.168.0.162:33071,192.168.0.162:33081" loose-group_replication_bootstrap_group= off loose-group_replication_single_primary_mode=off loose-group_replication_enforce_update_everywhere_checks=on
在这里有一些技术细节要说明一下：
上面的三个配置文件省略了所有不必要的配置项、但是看起来还是有点多、这些都是mgr环境要求的。
server_id 每个实例都要不要样
loose-group_replication_group_name：为mgr高可用组起一个名字，必须是有效的UUID。在二进制日志中为组复制事件设置GTID时，将在内部使用此UUID。使用SELECT UUID()生成一个UUID。
loose-group_replication_local_address：mgr各实例之前都是要进行通信的、这个配置项设置的就是本实例所监听的ip：端口
loose-group_replication_group_seeds：各mgr实例所监听的ip:端口信息
其他配置参数，请参考官方文档：
https://dev.mysql.com/doc/refman/5.7/en/group-replication-configuring-instances.html
初始化3306实例：
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my3306.cnf --initialize-insecure
启动3306实例：
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my3306.cnf &
进入mysql进行change操作：
/usr/local/mysql/bin/mysql -u root -S /tmp/mysql3306.sock mysql> SET SQL_LOG_BIN=0; mysql> CREATE USER rpl_user@‘%‘; mysql> GRANT REPLICATION SLAVE ON *.* TO rpl_user@‘%‘ IDENTIFIED BY ‘rpl_pass‘; mysql> SET SQL_LOG_BIN=1; mysql> CHANGE MASTER TO MASTER_USER=‘rpl_user‘, MASTER_PASSWORD=‘rpl_pass‘ FOR CHANNEL ‘group_replication_recovery‘;
mysql> INSTALL PLUGIN group_replication SONAME ‘group_replication.so‘; mysql> SHOW PLUGINS; +----------------------------+----------+--------------------+----------------------+---------+ | Name | Status | Type | Library | License | +----------------------------+----------+--------------------+----------------------+---------+ | binlog | ACTIVE | STORAGE ENGINE | NULL | GPL | | mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL | |... ... ... | | group_replication | ACTIVE | GROUP REPLICATION | group_replication.so | GPL | +----------------------------+----------+--------------------+----------------------+---------+
mysql> SET GLOBAL group_replication_bootstrap_group=ON; #只在第一个节点使用
mysql> START GROUP_REPLICATION;
确认节点加入情况：
mysql> SELECT * FROM performance_schema.replication_group_members; +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | group_replication_applier | 68ce93ca-d292-11e6-bdf9-005056b8286c | localhost.localdomain | 3306 | ONLINE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ 1 rows in set (0.00 sec)
mysql> create database boom; mysql> use boom; mysql> create table boomballa(id int not null,name varchar(32),primary key(id)); mysql> insert into boomballa(id,name) values(1,‘boomballa.top‘); mysql> insert into boomballa(id,name) values(2,‘myblog‘);
查看端口是否启动
root@ubuntu:/data/mysql/mysql_3306# netstat -anpt | grep 33061 tcp 0 0 0.0.0.0:33061 0.0.0.0:* LISTEN 1897/mysqld
# 复制配置文件 cd /data/mysql/mysql_3307/ cp ../mysql_3306/my3306.cnf my3307.cnf # 编辑配置文件 vim my3307.cnf #将替换3306为3307
loose-group_replication_local_address= "192.168.0.162:33071" loose-group_replication_group_seeds= "192.168.0.162:33061,192.168.0.162:33071,192.168.0.162:33081"
注意：loose-group_replication_local_address配置参数，必须要在loose-group_replication_group_seeds里面！
否则会出现3092错误
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3307/my3307.cnf --initialize-insecure /usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3307/my3307.cnf &
mysql> SET SQL_LOG_BIN=0; mysql> CREATE USER rpl_user@‘%‘; mysql> GRANT REPLICATION SLAVE ON *.* TO rpl_user@‘%‘ IDENTIFIED BY ‘rpl_pass‘; mysql> SET SQL_LOG_BIN=1; mysql> CHANGE MASTER TO MASTER_USER=‘rpl_user‘, MASTER_PASSWORD=‘rpl_pass‘ FOR CHANNEL ‘group_replication_recovery‘; mysql> INSTALL PLUGIN group_replication SONAME ‘group_replication.so‘; mysql> START GROUP_REPLICATION; mysql> SELECT * FROM performance_schema.replication_group_members; +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | group_replication_applier | 5aaa8529-d296-11e6-a7be-005056b8286c | localhost.localdomain | 3307 | ONLINE | | group_replication_applier | 68ce93ca-d292-11e6-bdf9-005056b8286c | localhost.localdomain | 3306 | ONLINE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ 2 rows in set (0.00 sec)
root@ubuntu:/data/mysql/mysql_3306# netstat -anpt | grep 33061 tcp 0 0 0.0.0.0:33071 0.0.0.0:* LISTEN 1950/mysqld
这里省略了，参考第二个节点。注意：替换端口为3308
安装好了以后的状态应该是(三节点上查询结果都是如此)：
mysql> SELECT * FROM performance_schema.replication_group_members; +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ | group_replication_applier | 5aaa8529-d296-11e6-a7be-005056b8286c | localhost.localdomain | 3307 | ONLINE | | group_replication_applier | 68ce93ca-d292-11e6-bdf9-005056b8286c | localhost.localdomain | 3306 | ONLINE | | group_replication_applier | af93afd1-d297-11e6-b8e9-005056b8286c | localhost.localdomain | 3308 | ONLINE | +---------------------------+--------------------------------------+-----------------------+-------------+--------------+ 3 rows in set (0.00 sec) mysql> use boom Database changed mysql> select * from boomballa; +----+---------------+ | id | name | +----+---------------+ | 1 | boomballa.top | | 2 | myblog | +----+---------------+ 2 rows in set (0.00 sec)
确认一下：
[root@localhost ~]# echo "select * from boom.boomballa;"|/usr/local/mysql/bin/mysql -S /tmp/mysql3306.sock id name 1 boomballa.top 2 myblog [root@localhost ~]# echo "select * from boom.boomballa;"|/usr/local/mysql/bin/mysql -S /tmp/mysql3307.sock id name 1 boomballa.top 2 myblog [root@localhost ~]# echo "select * from boom.boomballa;"|/usr/local/mysql/bin/mysql -S /tmp/mysql3308.sock id name 1 boomballa.top 2 myblog
root@ubuntu:/data/mysql/mysql_3306# ps -aux | grep mysql mysql 1897 0.1 6.3 1718160 255244 pts/0 Sl 16:06 0:08 /usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my3306.cnf mysql 1950 0.1 6.2 1705688 252724 pts/0 Sl 16:07 0:08 /usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3307/my3307.cnf mysql 2147 0.2 6.2 1709152 251420 pts/1 Sl 16:25 0:09 /usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3308/my3308.cnf root 2228 0.0 0.0 14224 928 pts/1 S+ 17:35 0:00 grep --color=auto mysql
设置第一个mysql实例密码，设置密码为root
/usr/local/mysql/bin/mysqladmin -u root -S /tmp/mysql3306.sock -p password root
授权root用户远程连接
/usr/local/mysql/bin/mysql -u root -S /tmp/mysql3306.sock -proot mysql> grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘root‘ with grant option; mysql> flush privileges;
测试其他端口，比如：3307和3308，也应该是可以查看表数据！
在3306修改表数据，在3307查看数据，会立即同步的
关闭其中一个节点
关闭3308的进程
kill 2147
再次查看3306和3307表数据，是ok的。
在3306修改表数据，3307也是会同步的
启动3308实例
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3308/my3308.cnf &
查看3308数据，发现数据没有更新过来
进入到3308，开启GROUP_REPLICATION
/usr/local/mysql/bin/mysql -u root -S /tmp/mysql3308.sock -proot mysql> START GROUP_REPLICATION;
标签：auth tput arc osi action mic ring repair 高级
原文地址：https://www.cnblogs.com/xiao987334176/p/10994959.html
