mysql galera HA

Posted 2020-09-17

MariaDB+gelera  HA

环境信息

centos 7.2.1511                         

版本信息

MariaDB 10.1.19-client

MariaDB 10.1.19-common

MariaDB 10.1.19-server

 

安装mariadb

yum install MariaDB-serverMariaDB-client

 

 

测试mysql是否正常

Service mysql start

Service mysql stop

 

创建mysql数据存放目录并授权

mkdir -p  /data

chown -R mysql.mysql /data

 

删除存在的数据库文件

rm -rf /var/lib/mysql/*

 

修改/etc/my.cnf

[mysqld]

binlog_format=ROW

bind-address = 172.16.16.1

collation-server = utf8_general_ci

character-set-server = utf8

default_storage_engine=innodb

datadir = /data

max_connections = 4096

pid-file = /data/mysql/mysql.pid

query_cache_size=0

socket = /tmp/mysql.sock

 

#*Innodb setting

#

innodb_file_per_table

innodb_autoinc_lock_mode=2

innodb_flush_log_at_trx_commit=0

innodb_buffer_pool_size=256M

 

初始化数据库

mysql_install_db

 

重新启动数据库

service mysql start

 

 

创建链接文件

ln -s /tmp/mysql.sock /var/lib/mysql/

 

安全安装

mysql_secure_installation

 

NOTE: RUNNING ALL PARTS OF THISSCRIPT IS RECOMMENDED FOR ALL MariaDB

      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

 

In order to log into MariaDB tosecure it, we‘ll need the current

password for the root user.  If you‘ve just installed MariaDB, and

you haven‘t set the root passwordyet, the password will be blank,

so you should just press enterhere.

 

Enter current password for root(enter for none):

OK, successfully used password,moving on...

 

Setting the root password ensuresthat nobody can log into the MariaDB

root user without the properauthorisation.

 

Set root password? [Y/n] Y

New password:

Re-enter new password:

Password updated successfully!

Reloading privilege tables..

 ... Success!

 

 

By default, a MariaDB installationhas an anonymous user, allowing anyone

to log into MariaDB without havingto have a user account created for

them.  This is intended only for testing, and tomake the installation

go a bit smoother.  You should remove them before moving into a

production environment.

 

Remove anonymous users? [Y/n] Y

 ... Success!

 

Normally, root should only beallowed to connect from ‘localhost‘. This

ensures that someone cannot guess atthe root password from the network.

 

Disallow root login remotely?[Y/n] n

 ... skipping.

 

By default, MariaDB comes with adatabase named ‘test‘ that anyone can

access.  This is also intended only for testing, andshould be removed

before moving into a productionenvironment.

 

Remove test database and access toit? [Y/n] y

 - Dropping test database...

 ... Success!

 - Removing privileges on test database...

 ... Success!

 

Reloading the privilege tableswill ensure that all changes made so far

will take effect immediately.

 

Reload privilege tables now? [Y/n]y

 ... Success!

 

Cleaning up...

 

All done!  If you‘ve completed all of the above steps,your MariaDB

installation should now be secure.

 

Thanks for using MariaDB!

 

创建同步用户

grant all privileges on *.* to ‘wsrep_user‘@‘controller2‘ identified by‘wsreppasswd‘;

flush privileges;

 

 

更新gelera下wsrep信息

编辑/etc/my.cnf.d/server.cnf

[galera]

wsrep_on=ON

wsrep_provider=/usr/lib64/galera/libgalera_smm.so

wsrep_cluster_address=gcomm://

wsrep_cluster_name=‘dbcluster‘

wsrep_node_address=‘172.16.16.1‘

wsrep_sst_method=rsync

#wsrep_sst_method=xtrabackup

wsrep_sst_auth=wsrep_user:wsreppasswd

wsrep_node_name=‘HA-1‘

wsrep_node_address=172.16.16.1

wsrep_provider_options="pc.recovery=TRUE;gcache.size=300M"

 

此时没有同步对象，所以wsrep_cluster_address=gcomm://留空

启动节点

sudo -u mysql mysqld --wsrep-cluster-address=‘gcomm://‘

 

首先配置节点2

使用1的配置文件直接复制后，修改信息

[mysqld]

bind-address = 172.16.16.2

[gelera]

wsrep_cluster_address=gcomm://172.16.16.1

wsrep_node_address=‘172.16.16.2‘

wsrep_node_name=‘HA-2‘

wsrep_node_address=172.16.16.2

 

此时数据同步方向为2同步1

启动节点2上的服务

同步完成后

关闭节点1服务

service mysql stop

修改同步对象wsrep_cluster_address=gcomm://172.16.16.2

重启服务后，双向同步完成，验证服务

MariaDB

[(none)]>show global status like ‘wsrep_cluster%‘;

从此处可以看出当有其他节点加入到集群中时，wsrep_cluster_size可以反映出当前集群节点数量，wsrep_cluster_status可以判定当前节点属于primary还是slave

GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ WITH GRANT OPTION;

 

 

GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘‘ WITH GRANT OPTION;

mysqladmin flush-hosts -h172.16.16.1 -P3306 -uroot -pdftcpass

 

 

mysql -uroot -h172.16.16.10 -P3307 -pdftcpass

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