mac下安装多个mysql实例

多实例安装  

  首先上mysql官网https://dev.mysql.com/downloads/mysql/下载最新版的mysql，由于要安装多个mysql实例，这里我选择压缩包版本的mysql手动安装。

    下载macOS 10.14 (x86, 64-bit), TAR这个版本后，运行tar -xvf命令进行解压,这里我解压到～/software/mysql-bin/mysql

    如果需要的话，可以将mysql目录设置软链接到/usr/local/mysql,类似于这样 ln -s ～/software/mysql-bin/mysql /usr/local/mysql，这一步需要root权限

    接下来，可以根据需要创建的mysql实例个数来创建mysql数据目录，这里我要创建两个实例，所以我新建了两个目录~/software/mysql-cluster/master和~/software/mysql-cluster/slave

   然后将mysql执行目录配置到环境变量中

   执行以下两条初始化命令，加上--initialize-insecure参数则生成的root用户没有密码，否则mysql初始化时随机生成一个密码并输入到日志文件中

    mysqld --datadir=～/software/mysql-cluster/mysql-master/data  --initialize --initialize-insecure

    mysqld --datadir=～/software/mysql-cluster/mysql-slave/data  --initialize --initialize-insecure   

    由于要启动多个实例，需要用到mysqld_multi命令，多个数据库实例公用一个配置文件，如下所示

[mysqld_multi]
#mysqld     = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user       = root
password   = root



[mysqld3307]
server-id=3307
port=3307
log-bin=mysql-bin

log-error=~/software/mysql-cluster/mysql-master/mysqld.log
tmpdir=~/software/mysql-cluster/mysql-master
slow_query_log=on
slow_query_log_file =~/software/mysql-cluster/mysql-master/mysql-slow.log
long_query_time=1

socket=~/software/mysql-cluster/mysql-master/mysql_3307.sock
pid-file=~/software/mysql-cluster/mysql-master/mysql.pid

basedir=~/software/mysql-cluster/mysql-master
datadir=~/software/mysql-cluster/mysql-master/data

[mysqld3308]
server-id=3308
port=3308
log-bin=mysql-bin

log-error=~/software/mysql-cluster/mysql-slave/mysqld.log
tmpdir=~/software/mysql-cluster/mysql-slave

slow_query_log=on
slow_query_log_file =~/software/mysql-cluster/mysql-slave/mysql-slow.log
long_query_time=1

socket=~/software/mysql-cluster/mysql-slave/mysql_3308.sock
pid-file=~/software/mysql-cluster/mysql-slave/mysql.pid


basedir=~/software/mysql-cluster/mysql-slave
datadir=~/software/mysql-cluster/mysql-slave/data

read_only=1


[mysqld]
character_set_server=utf8

 接下来，运行mysqld_multi --default-files=cluster.conf start即可启动所有mysql实例

配置主从复制

   连接上主mysql，创建用于复制的用户并赋予复制权限：

mysql> create user 'copy'@'%' identified by 'copy';
Query OK, 0 rows affected (0.07 sec)

mysql> grant replication slave on *.* to 'copy'@'%';
Query OK, 0 rows affected (0.02 sec)

   执行show master status命令

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |     1166 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+

    连接从mysql，设置master信息并启动slave：

mysql> change master to master_host='127.0.0.1', master_port=3307,master_user='copy',master_password='copy',master_log_file='mysql-bin.000002',master_log_pos=1166;
Query OK, 0 rows affected, 1 warning (0.10 sec)

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

   执行show slave status命令，查看slave状态，发现Slave_IO_State是Waiting for master to send event，Slave_IO_Running和Slave_SQL_Running状态是YES就说明设置成功

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 127.0.0.1
                  Master_User: copy
                  Master_Port: 3307
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 1166
               Relay_Log_File: 192-relay-bin.000002
                Relay_Log_Pos: 322
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes