九.mysql数据库多实例安装mysqld_multi [start,stop,report]

经常应为系统硬件短缺，导致需要在同一台硬件服务器上面安装多个mysql实例。之前的文章四·安装mysql-5.7.16-linux-glibc2.5-x86_64.tar.gz（基于Centos7源码安装）

1.在mysql用户目录下新建mysql3306，mysql3307，mysql3308三个文件夹，并分别在这三个文件夹下建立data,log,tmp文件夹，总体目录结构如下

/home/mysql

├── mysql3306

├──data

├──log

├──tmp

├── mysql3307

├──data

├──log

├──tmp

├── mysql3308

├──data

├──log

├──tmp

2.配置my.cnf文件

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

[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld_safe
mysqladmin=/usr/local/mysql/bin/mysqladmin
log=/home/mysql/mysqld_multi.log

[mysqld]
user=mysql
basedir=/usr/local/mysql
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqld3306]
mysqld=mysqld
mysqladmin=mysqladmin
datadir=/home/mysql/mysql3306/data
port=3306
server_id=3306
socket=/tmp/mysql3306.sock
log-output=file
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /home/mysql/mysql3306/log/slow.log
log-error = /home/mysql/mysql3306/log/error.log
binlog_format = mixed
log-bin = /home/mysql/mysql3306/log/mysql3306_bin

[mysqld3307]
mysqld=mysqld
mysqladmin=mysqladmin
datadir=/home/mysql/mysql3307/data
port=3307
server_id=3307
socket=/tmp/mysql3307.sock
log-output=file
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /home/mysql/mysql3307/log/slow.log
log-error = /home/mysql/mysql3307/log/error.log
binlog_format = mixed
log-bin = /home/mysql/mysql3307/log/mysql3307_bin

[mysqld3308]
mysqld=mysqld
mysqladmin=mysqladmin
datadir=/home/mysql/mysql3308/data
port=3308
server_id=3308
socket=/tmp/mysql3308.sock
log-output=file
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /home/mysql/mysql3308/log/slow.log
log-error = /home/mysql/mysql3308/log/error.log
binlog_format = mixed
log-bin = /home/mysql/mysql3308/log/mysql3308_bin

3.运行mysqld_multi

# 启动
/usr/local/mysql/bin/mysqld_multi start

# 停止
/usr/local/mysql/bin/mysqld_multi stop

# 查询状态
/usr/local/mysql/bin/mysqld_multi report