最近在學習mycat原始碼,有單台雲主機上要跑多個例項的需求，參考了以下的文章
4.修改my.cnf
vim /usr/local/mysql/etc/my.cnf
注釋以下內容
[client]
password = your_password
port = 3306
socket = /tmp/mysql.sock
新增以下
[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld_safe
mysqladmin=/usr/local/mysql/bin/mysqladmin
user=root
password=wxm123456
修改[mysqld1]
port = 3306
socket = /tmp/mysql3306.sock
pid-file = /usr/local/mysql/data3306/mysql.pid
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data3306
log_error = /usr/local/mysql/3306_error.log
[mysqld2]
port = 3307
socket = /tmp/mysql3307.sock
pid-file = /usr/local/mysql/data3307/mysql.pid
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data3307
log_error = /usr/local/mysql/3307_error.log
[mysqld3]
port = 3308
socket = /tmp/mysql3308.sock
pid-file = /usr/local/mysql/data3308/mysql.pid
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data3308
log_error = /usr/local/mysql/3308_error.log
5.不需要密碼直接登入後,配置mysql訪問許可權
mysql -s /tmp/mysql3306.sock -p 3306 -uroot -p
mysql -s /tmp/mysql3307.sock -p 3307 -uroot -p
mysql -s /tmp/mysql3308.sock -p 3308-uroot -p
mysql> set password=password('wxm123456');
mysql> grant all on *.* to'root'@'%' identified by 'wxm123456';
mysql> flush privileges;
6.啟動所有mysql例項
mysqld_multi --defaults-file=/usr/local/mysql/etc/my.cnf start 1,2,3
7.啟動單個mysql例項
mysqld_multi --defaults-file=/usr/local/mysql/etc/my.cnf start 1
mysqld_multi --defaults-file=/usr/local/mysql/etc/my.cnf start 2
mysqld_multi --defaults-file=/usr/local/mysql/etc/my.cnf start 3
8.檢視所有例項狀態
#mysqld_multi --defaults-file=/usr/local/mysql/etc/my.cnf report 1,2,3
reporting mysql servers
mysql server from group: mysqld1 is running
mysql server from group: mysqld2 is running
mysql server from group: mysqld3 is running
9.停止所有例項
ps -ef | grep mysql | awk '' | xargs kill -9
10.停止單個例項
ps -ef | grep data3306 | awk '' | xargs kill -9
ps -ef | grep data3307 | awk '' | xargs kill -9
ps -ef | grep data3308 | awk '' | xargs kill -9
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