MySQL之GroupReplication初体验

时间 2019-12-20

标签 mysql groupreplication 体验栏目 MySQL 繁體版

原文原文链接

https://dev.mysql.com/doc/refman/5.7/en/group-replication.htmlhtml

基本的架构一主两从mysql

master：192.168.100.41sql

slave：192.168.100.42数据库

slave：192.168.100.43bootstrap

下载软件官方网站架构

mysql-community-client-5.7.17-1.el6.x86_64.rpmapp

mysql-community-common-5.7.17-1.el6.x86_64.rpmsocket

mysql-community-devel-5.7.17-1.el6.x86_64.rpmide

mysql-community-embedded-5.7.17-1.el6.x86_64.rpmmemcached

mysql-community-embedded-devel-5.7.17-1.el6.x86_64.rpm

mysql-community-libs-5.7.17-1.el6.x86_64.rpm

mysql-community-libs-compat-5.7.17-1.el6.x86_64.rpm

mysql-community-server-5.7.17-1.el6.x86_64.rpm

安装好后初始化数据库

/usr/sbin/mysqld --initilaize

mysql -uroot -p''

密码在mysqld.log中

登录后须要更改root密码，不然是任何事情也干不了！

mysql> alter user 'root'@'localhost' identified by 'root';

#每一个主机分别建立复制帐号：

mysql> CREATE USER rpluser@'%';

Query OK, 0 rows affected (0.02 sec)

mysql> GRANT REPLICATION SLAVE ON *.* TO rpluser@'%' IDENTIFIED BY 'rplpass';

#三台mysql分别添加GR复制插件

MySQL的插件位置在/usr/lib64/mysql/plugin下（RPM安装），不一样的安装方式位置不一样

[root@master plugin]# ll

total 50708

-rwxr-xr-x 1 root root 86038 Nov 28 22:30 adt_null.so

-rwxr-xr-x 1 root root 40650 Nov 28 22:30 auth_socket.so

-rwxr-xr-x 1 root root 670808 Nov 28 22:31 connection_control.so

drwxr-xr-x 2 root root 4096 Jan 22 17:07 debug

-rwxr-xr-x 1 root root 15645986 Nov 28 22:32 group_replication.so

-rwxr-xr-x 1 root root 343512 Nov 28 22:30 ha_example.so

-rwxr-xr-x 1 root root 685137 Nov 28 22:30 innodb_engine.so

-rwxr-xr-x 1 root root 761474 Nov 28 22:30 keyring_file.so

-rwxr-xr-x 1 root root 293528 Nov 28 22:31 keyring_udf.so

-rwxr-xr-x 1 root root 637537 Nov 28 22:30 libmemcached.so

-rwxr-xr-x 1 root root 7945238 Nov 28 22:31 libpluginmecab.so

-rwxr-xr-x 1 root root 16892 Nov 28 22:31 locking_service.so

-rwxr-xr-x 1 root root 49314 Nov 28 22:31 mypluglib.so

-rwxr-xr-x 1 root root 38158 Nov 28 22:30 mysql_no_login.so

-rwxr-xr-x 1 root root 22598217 Nov 28 22:32 mysqlx.so

-rwxr-xr-x 1 root root 46913 Nov 28 22:31 rewrite_example.so

-rwxr-xr-x 1 root root 619923 Nov 28 22:31 rewriter.so

-rwxr-xr-x 1 root root 693981 Nov 28 22:31 semisync_master.so

-rwxr-xr-x 1 root root 152509 Nov 28 22:31 semisync_slave.so

-rwxr-xr-x 1 root root 205419 Nov 28 22:30 validate_password.so

-rwxr-xr-x 1 root root 346295 Nov 28 22:31 version_token.so

mysql>INSTALL PLUGIN group_replication SONAME 'group_replication.so';

mysql> show plugins;

+----------------------------+----------+--------------------+----------------------+---------+

+----------------------------+----------+--------------------+----------------------+---------+

。。。。。。省略部分输出。。。。。。

+----------------------------+----------+--------------------+----------------------+---------+

#binlog 格式为ROW

mysql> show variables like 'binlog_format';

+---------------+-------+

| Variable_name | Value |

+---------------+-------+

| binlog_format | ROW |

+---------------+-------+

#配置文件内容

[mysqld]

server-id = 1 #每一个主机分别改成不一样值

user=mysql

explicit_defaults_for_timestamp

socket=mysql1.sock

port = 3306

# binlog

log-bin=mysql-bin

binlog-format = ROW

log-slave-updates = ON

master-info-repository = TABLE

relay-log-info-repository = TABLE

binlog-checksum = NONE

slave-parallel-workers = 0

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

#GroupRepliation

gtid-mode = on

enforce_gtid_consistency = on

transaction_write_set_extraction=XXHASH64

loose-group_replication_group_name="ef6efed8-e084-11e6-b61e-005056ba4b95"

loose-group_replication_start_on_boot=off

loose-group_replication_local_address= "192.168.100.41:3308" #每一个主机分别改成不一样值，为本机IP

loose-group_replication_group_seeds= "192.168.100.41:3308,192.168.100.42:3308,192.168.100.43:3308"

loose-group_replication_bootstrap_group= off

loose-group_replication_single_primary_mode=FALSE #multi master mode

loose-group_replication_enforce_update_everywhere_checks= TRUE

#添加第一个节点

mysql> CHANGE MASTER TO MASTER_USER='rpluser', MASTER_PASSWORD='rplpass' FOR CHANNEL 'group_replication_recovery';

mysql> set global group_replication_bootstrap_group=on;

mysql> start group_replication;

mysql> set global group_replication_bootstrap_group=off;

#group_replication_bootstrap_group参数设置的缘由请见官方解释：

group_replication_bootstrap_group

Description: Specify if this member will bootstrap the group. This option must only be set in one server and only once starting the group for the first time or restarting the entire group. After the group has been bootstrapped, the user is advised to set this option to OFF. It should be set to OFF both dynamically and in the configuration files. Starting two servers or restarting one server with this option set while the group is running may lead to an artificial split brain situation, where two independent groups with the same name are bootstrapped.

Type: Boolean

Accepted Input: ON, OFF

Default: OFF

Dynamic: Yes

Scope: Global

mysql> select * from replication_group_members ;

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

#添加第二个节点

mysql> CHANGE MASTER TO MASTER_USER='rpluser', MASTER_PASSWORD='rplpass' FOR CHANNEL 'group_replication_recovery';

mysql> start group_replication;

mysql> select * from replication_group_members ;

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

+---------------------------+--------------------------------------+--------------------+-------------+--------------+

#添加第三个节点

mysql> CHANGE MASTER TO MASTER_USER='rpluser', MASTER_PASSWORD='rplpass' FOR CHANNEL 'group_replication_recovery';

mysql> start group_replication;

mysql> select * from replication_group_members ;

+---------------------------+--------------------------------------+---------------------+-------------+--------------+

+---------------------------+--------------------------------------+---------------------+-------------+--------------+

+---------------------------+--------------------------------------+---------------------+-------------+--------------+

多主模式：

随意中止一台，不影响剩下的主机之间的复制

从新加入集群只要 start group_replication 便可

任意节点可写

单主模式：

主节点挂掉后，配置文件中第二个配置的IP的主机为主

只有主节点可写，其他节点只读且超级用户也只读 mysql> create table abc select * from mysql.user;

ERROR 1290 (HY000): The MySQL server is running with the --super-read-only option so it cannot execute this statement

只剩单独一个节点自动变为读写