1、添加mysql用户

以root登录，新建mysql用户组

 groupadd mysql
 useradd -d /data/mariadb -g mysql -m mysql

2、 mariadb的安装置

2.1 安装所需组件

 yum install -y cmake
 yum install -y gcc
 yum install -y gcc-c++
 yum install -y ncurses-devel
 yum install -y libaio
 yum install -y bison 

2.2创建mariadb编译根目录

mkdir -p /usr/local/mariadb

2.3解压缩源码包

tar zxvf mariadb-5.5.51.tar.gz 
cd mariadb-5.5.51

2.4编译安装

cd /usr/local/mariadb/mariadb-5.5.51/
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mariadb -DMYSQL_DATADIR=/data/mariadb -DSYSCONFDIR=/usr/local/mariadb -DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_ARCHIVE_STORAGE_ENGINE=1 -DWITH_BLACKHOLE_STORAGE_ENGINE=1 -DWITH_PERFSCHEMA_STORAGE_ENGINE=1 -DMYSQL_UNIX_ADDR=/usr/local/mariadb/mysql.sock
make     
make install   

2.5修改环境变量文件，修改vi ~/.bash_profile，添加如下内容；

PATH=$PATH:$HOME/bin:/usr/local/mariadb/bin
export PATH
添加完成后，source ~/.bash_profile

3.mariadb双实例的建立

3.1建立两个实例所需目录并授权

 makdir -p /usr/local/mariadb1_3307
 makdir -p /usr/local/mariadb2_3308
 makdir -p /data/mariadb1_3307
 makdir -p /data/mariadb2_3308

3.2 拷贝配置文件到/etc目录下

 cp /usr/localmariadb/support-files/my-medium.cnf/my.cnf /etc/my.cnf 

3.3 配置mariadb1实例1

3.3.1修改配置文件为

[mysqld_multi]
mysqld=/usr/local/mariadb/bin/mysqld_safe
mysqladmin=/usr/local/mariadb/bin/mysqladmin
log=/data/mariadb/mysqld_multi.log
[mysqld1]
port = 3307
socket = /usr/local/mariadb1_3307/mysql.sock
basedir = /usr/local/mariadb
datadir = /data/mariadb1_3307
pid-file = /data/mariadb1_3307/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1230
slave-skip-errors=all
binlog=/data/mariadb1_3307/binlog
relay-log=/data/mariadb1_3307/relay_log/mysql-relay-bin
log_slave_updates = 1
read_only = 0
binlog_format = row
expire_logs_days = 10
default_storage_engine = InnoDB
innodb_buffer_pool_size = 128M
innodb_flush_log_at_trx_commit = 0

3.3.2 初始化数据库
进入bin目录，

cd /usr/local/mariadb/scripts
 ./mysql_install_db --user=mysql --basedir=/usr/local/mariadb --datadir=/data/mariadb1_3307

3.4配置mariadb2实例2

方法同实例1
4、启动多实例数据库

4.1启动数据库实例

 mysqld_multi start 1-2

4.2关闭防火墙

systemctl stop firewalld.service    
systemctl disable firewalld.service   
查看：netstat -tnlp

4.3 修改环境变量文件，修改vi ~/.bash_profile，添加如下内容；

PATH=$PATH:/usr/local/mariadb/bin
export PATH
添加完成后，source ~/.bash_profile

4.4访问数据库

 mysql -uroot -p -S /usr/local/mariadb1_3307/mysql.sock   --实例1
 mysql -uroot -p -S /usr/local/mariadb2_3308/mysql.sock   --实例2

4.5 查看多实例

mysqld_multi report

4.6 关闭数据库

刚开始无法使用mysql_multi关闭数据库
原因：需对账号授权

mysqld_multi stop 1,2

4.6 完成