MariaDB下载安装（主从节点一样）

删除旧有数据库（注意自带MySQL也需要删除）

yum下载安装 yum -y install mariadb mariadb-server

建立数据存储路径

cd /opt && mkdir mysql

迁移数据存储路径到/opt下面

cp -r /var/lib/mysql/* /opt/mysql/

修改配置文件

vim /etc/my.cnf.d/mariadb-server.cnf

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标红位置为重点配置

授权mysql 用户

chown -R mysql:mysql /opt/mysql/

启动mariadb

systemctl start mariadb

加入开机自启

systemctl enable mariadb

登录mysql初始化
UPDATE mysql.user SET password = PASSWORD('maysqlpassword') WHERE USER = 'root';

FLUSH PRIVILEGES;

加入开机自启

systemctl enable mariadb

MariaDB主从节点搭建

主节点配置文件（配置完需要重启服务）

#
# These groups are read by MariaDB server.
# Use it for options that only the server (but not clients) should see
#
# See the examples of server my.cnf files in /usr/share/mysql/
#

# this is read by the standalone daemon and embedded servers
[server]

# this is only for the mysqld standalone daemon
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mysqld/mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd
[mysqld]
datadir=/opt/mysql
socket=/opt/mysql/mysql.sock
log-error=/var/log/mariadb/mariadb.log
# These groups are read by MariaDB server.
# Use it for options that only the server (but not clients) should see
#
# See the examples of server my.cnf files in /usr/share/mysql/
#

# this is read by the standalone daemon and embedded servers
[server]

# this is only for the mysqld standalone daemon
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mysqld/mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd
[mysqld]
datadir=/opt/mysql
socket=/opt/mysql/mysql.sock
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
# 服务唯一id 最好跟内网IP最后保持一致
server-id=186
# 开启二进制文件地址
log-bin=/opt/mysql/maste-log
# 同步二进制日志文件
sync_binlog = 1 
# 由replication机制的SQL线程读取relay-log而执行的SQL语句记录到bin-log
log-slave-updates=true

[client]
port=3306
socket=/opt/mysql/mysql.sock

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登录MySQL 配置同步用户及 查看主节点信息

CREATE USER 'slave'@'%' IDENTIFIED BY 'maysqlpassword';

***这个权限很重要REPLICATION ***

GRANT REPLICATION SLAVE ON . TO 'slave'@'%';

刷新权限

flush privileges;

重置主键点信息

reset master;

查看主节点信息（查看完成后最好锁表，数据变化会引起状态变化）

show master status \G;

{{image.png}}

红框信息需记住，从库配置需要用

从节点配置文件（配置完需要重启服务）

#
# These groups are read by MariaDB server.
# Use it for options that only the server (but not clients) should see
#
# See the examples of server my.cnf files in /usr/share/mysql/
#

# this is read by the standalone daemon and embedded servers
[server]

# this is only for the mysqld standalone daemon
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mysqld/mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd
[mysqld]
datadir=/opt/mysql
socket=/opt/mysql/mysql.sock
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid

server-id=187

# 开启二进制文件
log-bin=mysql-bin
log-slave-updates=true

[client]
port=3306
socket=/opt/mysql/mysql.sock


#
# * Galera-related settings
#
[galera]
# Mandatory settings
#wsrep_on=ON
#wsrep_provider=
#wsrep_cluster_address=
#binlog_format=row
#default_storage_engine=InnoDB
#innodb_autoinc_lock_mode=2
#
# Allow server to accept connections on all interfaces.
#
#bind-address=0.0.0.0
#
# Optional setting
#wsrep_slave_threads=1
#innodb_flush_log_at_trx_commit=0

# this is only for embedded server
[embedded]

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登录MySQL

停置从节点

stop slave;

重置从节点

reset slave all;

设置从节点信息

 CHANGE MASTER TO MASTER_HOST='***.40.64.***', 
MASTER_USER='slave',  ---主节点设置得用户名
MASTER_PASSWORD='maysqlpassword', ---主节点设置得用户名密码
MASTER_LOG_FILE='maste-log.000002', ---主节点master设置得master file
MASTER_LOG_POS=313; ---主节点master设置得MASTER_LOG_POS

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查看从节点信息

```  show slave status \G; ```
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开启从节点服务

start slave;

再次查看从节点信息，

#### 这俩参数为yes 及配置成功
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
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