linux 安装MySQL多实例

q456123

　　环境:centos6.5
　　MySQL: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 [OPTIONS]
　　--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-resolve  Use 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：
　　[client]
　　character-set-server = utf8
　　port    = 3308
　　socket  = /tmp/mysql_3308.sock
　　[mysqld]
　　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
　　[root@Test2 data]# /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
　　[1] 7221
　　[root@Test2 data]# 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 [Note] InnoDB: Using mutexes to ref count buffer pool pages
　　171031 16:49:56 [Note] InnoDB: The InnoDB memory heap is disabled
　　171031 16:49:56 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
　　171031 16:49:56 [Note] InnoDB: Memory barrier is not used
　　171031 16:49:56 [Note] InnoDB: Compressed tables use zlib 1.2.3
　　171031 16:49:56 [Note] InnoDB: Using Linux native AIO
　　171031 16:49:56 [Note] InnoDB: Using CPU crc32 instructions

　　171031 16:49:56 [Note] InnoDB: Initializing buffer pool,>　　171031 16:49:56 [Note] InnoDB: Completed initialization of buffer pool
　　171031 16:49:56 [ERROR] InnoDB: ./ibdata1 can't be opened in read-write mode
　　171031 16:49:56 [ERROR] InnoDB: The system tablespace must be writable!
　　171031 16:49:56 [ERROR] Plugin 'InnoDB' init function returned error.
　　171031 16:49:56 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
　　171031 16:49:56 [ERROR] mysqld: File '/data/mysql_3308/data/aria_log_control' not found (Errcode: 13 "Permission denied")
　　171031 16:49:56 [ERROR] 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 [ERROR] Plugin 'Aria' init function returned error.
　　171031 16:49:56 [ERROR] Plugin 'Aria' registration as a STORAGE ENGINE failed.
　　171031 16:49:56 [Note] Plugin 'FEEDBACK' is disabled.
　　171031 16:49:56 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
　　171031 16:49:56 [ERROR] Unknown/unsupported storage engine: InnoDB
　　171031 16:49:56 [ERROR] Aborting
　　171031 16:49:56 [Note] /usr/sbin/mysqld: Shutdown complete'
　　[1]+  Exit 1                  /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf
　　解决方法:
　　[root@Test2 /]# chown -R mysql.mysql /data/
　　[root@Test2 /]# /usr/bin/mysqld_safe --defaults-file=/data/mysql_3308/my.cnf &
　　[1] 7371
　　[root@Test2 /]# 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:
　　[root@localhost mysql_3308]# 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 &
　　本文借鉴: