Mysql进阶-day3

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多实例介绍：

　　mysql多实例就是一台服务器开启多个不同的服务端口（3306,3307），运行多个MySQL服务进程，这些服务进程通过不同的socket监听不同的服务端口来提供各自的服务端口。

　　这些mysql多实例共用一套mysql安装程序，使用不同的my.cnf配置文件、启动程序、数据文件。在提供服务时，多实例MySQL在逻辑上看来十个字独立的，多个实例之间是根据配置文件的设定值，来取得服务器的相关硬件资源

MySQL多实例常见配置方案

1.多配置文件方案
#通过多个配置文件及多个启动程序来实现多实例的方案

2.单一配置文件部署方案
#把所有的实例放在一个配置文件里，一个mysqld就是一个实例

安装配置多实例

1.建立MySQL多实例的条件
     首先要用前面说过的四中安装方法之一（编译安装，cmake安装，yum安装，免编译安装）安装好数据库，
2.安装（看前面的）

3.开始配置
[root@MySQL /]# service mysqld stop
[root@MySQL /]# mkdir /data/{3306,3307}/data -p #创建多实例目录
[root@MySQL /]# cat /data/3306/my.cnf
####
[client]
port = 3306
socket = /tmp/mysql_3306.sock

[mysql]
no-auto-rehash

[mysqld]
user            = mysql
port		= 3306
socket		= /tmp/mysql_3306.sock
basedir = /usr/local/mysql-5.5.54/
datadir = /data/3306/data/
open_files_limit = 1024
back_log = 600
max_connections = 800
max_connect_errors = 3000
table_cache = 614
external-locking = FALSE
max_allowed_packet = 8M
sort_buffer_size = 1M
join_buffer_size = 1M
thread_cache_size = 100
thread_concurrency = 2
query_cache_size = 2M
query_cache_limit = 1M
query_cache_min_res_unit = 2K
#default_table_type = InnoDB
thread_stack = 192K
#transaction_isolation = READ-COMMITTED
tmp_table_size = 2M
max_heap_table_size = 1
#log_long_format
log-error = /data/3306/error_3306.log
log-slow-queries = /data/3306/slow.log
pid-file = /data/3306/mysql.pid
log-bin = /data/3306/mysql-bin
relay-log = /data/3306/relay-bin
relay-log-info-file = /data/3306/relay-log.info
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M
expire_logs_days = 7
key_buffer_size = 16M
read_buffer_size = 1M
read_rnd_buffer_size = 1M
bulk_insert_buffer_size = 1M
#myisam_sort_buffer_size = 1M
#myisam_max_sort_file_size = 10G
#myisam_max_extra_sort_file_size = 10G
#myisam_repair_threads = 1
#myisam_recover

lower_case_table_names = 1
skip-name-resolve
slave-skip-errors = 1032,1062
replicate-ignore-db=mysql

server-id = 1
innodb_additional_mem_pool_size = 4M
innodb_buffer_pool_size = 32M
innodb_data_file_path = ibdata1:128M:autoextend
innodb_file_io_threads = 4
innodb_thread_concurrency = 8
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file-size = 4M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = 0

[mysqldump]
quick
max_allowed_packet = 2M

[mysqld_safe]
log-error=/data/3306/mysql_3306.err
pid-file=/data/3306/mysqld_3306.pid
####
#另一个就不看了，把所有的3306换成3307即可
[root@MySQL /]# touch /data/3306/mysql_3306.err  #创建相关错误日志文件
[root@MySQL /]# touch /data/3307/mysql_3307.err  #创建相关错误日志文件
[root@MySQL /]# chown -R mysql.mysql /data
[root@MySQL /]# mysql_install_db --basedir=/usr/local/mysql --datadir=/data/3306/data --user=mysql
[root@MySQL /]# mysql_install_db --basedir=/usr/local/mysql --datadir=/data/3307/data --user=mysql
#初始化
[root@MySQL /]# mysqld_safe --defaults-file=/data/3306/my.cnf 2>&1 &
[root@MySQL /]# mysqld_safe --defaults-file=/data/3307/my.cnf 2>&1 &
#启动

#这里启动可以自己写个脚本，脚本放在下面

[root@MySQL /]# mysqladmin -uroot password -S /tmp/mysql_3306.sock
[root@MySQL /]# mysqladmin -uroot password -S /tmp/mysql_3307.sock
#为两个实例创建管理员和密码
[root@MySQL /]# mysql -uroot -p -S /tmp/mysql_3306.sock #连接数据库

#多实例到这里就安装完了

脚本

#!/bin/bash
PORT=3306
USERNAME="root"
PASSWORD="3306"
start_mysql()
{
printf "Starting MySQL...\n"
/bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/data/${PORT}/my.cnf 2>&1 > /dev/null &
}
stop_mysql()
{
printf "Stoping MySQL...\n"
/usr/local/mysql/bin/mysqladmin -u${USERNAME} -p${PASSWORD} -S /tmp/mysql_${PORT}.sock shutdown
}
restart_mysql()
{
printf "Restarting MySQL...\n"
stop_mysql
start_mysql
}
kill_mysql()
{
kill -9 $(ps -ef | grep 'bin/mysqld_safe' | grep ${PORT} | awk '{printf $2}')
kill -9 $(ps -ef | grep 'libexec/mysqld' | grep ${PORT} | awk '{printf $2}')
}
case $1 in
start)
start_mysql;;
stop)
stop_mysql;;
kill)
kill_mysql;;
restart)
restart_mysql;;
*)
echo "Usage: /data/dbdata_${mysql_port}/mysqld {start|stop|restart|kill}";;
esac

新增实例

这个不写，跟前面是一样的，增加一个数据目录，配置文件，脚本，授权，初始化，启动

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