MySQL之GroupReplication初體驗

時間 2019-12-20

標籤 mysql groupreplication 體驗欄目 MySQL 简体版

原文原文鏈接

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

基本的架構一主兩從mysql

master：192.168.100.41sql

slave：192.168.100.42數據庫

slave：192.168.100.43bootstrap

下載軟件官方網站架構

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

安裝好後初始化數據庫

/usr/sbin/mysqld --initilaize

mysql -uroot -p''

密碼在mysqld.log中

登錄後須要更改root密碼，不然是任何事情也幹不了！

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

#每一個主機分別建立複製帳號：

mysql> CREATE USER rpluser@'%';

Query OK, 0 rows affected (0.02 sec)

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

#三臺mysql分別添加GR複製插件

MySQL的插件位置在/usr/lib64/mysql/plugin下（RPM安裝），不一樣的安裝方式位置不一樣

[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;

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

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

。。。。。。省略部分輸出。。。。。。

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

#binlog 格式爲ROW

mysql> show variables like 'binlog_format';

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

| Variable_name | Value |

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

| binlog_format | ROW |

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

#配置文件內容

[mysqld]

server-id = 1 #每一個主機分別改成不一樣值

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" #每一個主機分別改成不一樣值，爲本機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

#添加第一個節點

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參數設置的緣由請見官方解釋：

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 ;

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

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

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

#添加第二個節點

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 ;

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

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

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

#添加第三個節點

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：

隨意中止一臺，不影響剩下的主機之間的複製

從新加入集羣只要 start group_replication 便可

任意節點可寫

單主模式：

主節點掛掉後，配置文件中第二個配置的IP的主機爲主

只有主節點可寫，其他節點只讀且超級用戶也只讀 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

只剩單獨一個節點自動變爲讀寫

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