linux 安装MySQL多实例
环境:centos6.5MySQL:mysql-5.5.57-winx64.zip 二进制安装包可以直接进mysql官网下载即可
https://cdn.mysql.com//Downloads/MySQL-5.5/mysql-5.5.58-winx64.zip
mysql_install_db说明
当MySQL的系统库（mysql系统库）发生故障或需要新加一个mysql实例时，需要初始化mysql数据库。
需要使用的命令：/usr/local/mysql/bin/mysql_install_db
#/usr/local/mysql/bin/mysql_install_db --help 可以查看帮助信息如下
Usage: /usr/local/mysql/bin/mysql_install_db
--basedir=path The path to the MySQL installation directory.
--cross-bootstrap For internal use.Used when building the MySQL system
tables on a different host than the target.
--datadir=path The path to the MySQL data directory.
--force Causes mysql_install_db to run even if DNS does not
work.In that case, grant table entries that normally
use hostnames will use IP addresses.
--ldata=path The path to the MySQL data directory.
--rpm For internal use.This option is used by RPM files
during the MySQL installation process.
--skip-name-resolveUse IP addresses rather than hostnames when creating
grant table entries.This option can be useful if
your DNS does not work.
--srcdir=path For internal use.The directory under which
mysql_install_db looks for support files such as the
error message file and the file for popoulating the
help tables.
--user=user_name The login username to use for running mysqld.Files
and directories created by mysqld will be owned by this
user.You must be root to use this option.By default
mysqld runs using your current login name and files and
directories that it creates will be owned by you.
All other options are passed to the mysqld program
除了支持以上的参数，还支持mysqld的参数。
二、举例：
本文以新加一个mysql实例为例。例如服务器上已经安装了3306端口的mysql服务，需要再启一个3308端口的mysql服务。
假设mysql安装在/usr/local/mysql路径下，找一个磁盘空间剩余比较大的盘，如/data，把3308端口的mysql的数据保存在/data1下
#mkdir /data/mysql_3308
#mkdir /data/mysql_3308/data
#chown -R mysql:mysql /data/mysql_3308
复制一个mysql配置文件my.cnf到/data1/mysql_3308目录下
#vi /data1/mysql_3308/my.cnf
修改配置文件，将端口和相关目录的都改为新的设置，如下：
character-set-server = utf8
port = 3308
socket= /tmp/mysql_3308.sock
user = mysql
port = 3308
socket= /tmp/mysql_3308.sock
basedir = /usr
datadir = /data/mysql_3308/data
log-error = /data/mysql_3308/mysql_error.log
pid-file = /data/mysql_3308/mysql.pid
......其他略
确保配置文件无误。
运行下面命令进行数据库的初始化：
#/usr/bin/mysql_install_db --defaults-file=/data/mysql_3308/my.cnf --datadir=/data/mysql_3308/data
完成后新的3308数据库就初始化好了，如果有报错，则按照报错的提示查看报错日志，一般情况下都是my.cnf配置文件的问题，修正后即可。
三、启动新mysql
启动3308端口的mysql服务
#/usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
检查是否启动
# /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
7221
# 171031 16:49:56 mysqld_safe Logging to '/data/mysql_3308/mysql_error.log'.
171031 16:49:56 mysqld_safe Starting mysqld daemon with databases from /data/mysql_3308/data
171031 16:49:56 mysqld_safe WSREP: Running position recovery with --log_error='/data/mysql_3308/data/wsrep_recovery.z7ccsq' --pid-file='/data/mysql_3308/data/Test2-recover.pid'
171031 16:49:56 mysqld_safe WSREP: Failed to recover position: '171031 16:49:56 InnoDB: Using mutexes to ref count buffer pool pages
171031 16:49:56 InnoDB: The InnoDB memory heap is disabled
171031 16:49:56 InnoDB: Mutexes and rw_locks use GCC atomic builtins
171031 16:49:56 InnoDB: Memory barrier is not used
171031 16:49:56 InnoDB: Compressed tables use zlib 1.2.3
171031 16:49:56 InnoDB: Using Linux native AIO
171031 16:49:56 InnoDB: Using CPU crc32 instructions
171031 16:49:56 InnoDB: Initializing buffer pool,> 171031 16:49:56 InnoDB: Completed initialization of buffer pool
171031 16:49:56 InnoDB: ./ibdata1 can't be opened in read-write mode
171031 16:49:56 InnoDB: The system tablespace must be writable!
171031 16:49:56 Plugin 'InnoDB' init function returned error.
171031 16:49:56 Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
171031 16:49:56 mysqld: File '/data/mysql_3308/data/aria_log_control' not found (Errcode: 13 "Permission denied")
171031 16:49:56 mysqld: Got error 'Can't open file' when trying to use aria control file '/data/mysql_3308/data/aria_log_control'
171031 16:49:56 Plugin 'Aria' init function returned error.
171031 16:49:56 Plugin 'Aria' registration as a STORAGE ENGINE failed.
171031 16:49:56 Plugin 'FEEDBACK' is disabled.
171031 16:49:56 Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
171031 16:49:56 Unknown/unsupported storage engine: InnoDB
171031 16:49:56 Aborting
171031 16:49:56 /usr/sbin/mysqld: Shutdown complete'
+Exit 1 /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf
解决方法:
# chown -R mysql.mysql /data/
# /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
7371
# 171031 16:52:06 mysqld_safe Logging to '/data/mysql_3308/mysql_error.log'.
171031 16:52:06 mysqld_safe Starting mysqld daemon with databases from /data/mysql_3308/data
171031 16:52:06 mysqld_safe WSREP: Running position recovery with --log_error='/data/mysql_3308/data/wsrep_recovery.EwYBM2' --pid-file='/data/mysql_3308/data/Test2-recover.pid'
171031 16:52:10 mysqld_safe WSREP: Recovered position 00000000-0000-0000-0000-000000000000:-1
#ps aux|grep mysql
如果有3308字样说明已经启动成功
可将启动命令加入/etc/rc.local随服务器启动
新加的mysql没有设置root密码，可以通过下面命令设置root密码：
#/usr/bin/mysqladmin -S /tmp/mysql_3308.sock -u root password 'root'
关闭多实例数据库:
# mysqladmin-uroot -p -S /tmp/mysql_3308.sock shutdown
Enter password:
启动多实例数据库:
/usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
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