一台伺服器執行多個mysql例項
多例項不同之處
資料目錄
埠 socket檔案
pid檔案
1：安裝mysql
2: 備份my.conf（新版本可以不操作這一步）
#mv /etc/my.conf /etc/my.conf.bak
#vi my.conf
[mysqld]
#daemonize = on #注釋掉這個，因為這個是守護程序
user = mysql
port = 3306
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
socket = /tmp/mysql.sock
pid-file = /var/run/mysqld/mysqld.pid
character-set-server = utf8
collation-server = utf8_general_ci
max_connections = 1024
log-error = /var/log/mysqld.log
3：初始化目錄
#bin/mysqld --initialize --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data1 --user=mysql
#bin/mysqld --initialize --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data2 --user=mysql
#bin/mysqld --initialize --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data3 --user=mysql
4: 編寫配置檔案
#vi /usr/local/mysql/my.cnf
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = multi_admin
password = my_password
[mysqld1]
socket = /tmp/mysql1.sock
port = 3306
pid-file = /usr/local/mysql/data1/mysql1.pid
datadir = /usr/local/mysql/data1
user = mysql
character-set-server = utf8
collation-server = utf8_general_ci
max_connections = 1024
log-error = /var/log/mysql1.log
[mysqld2]
socket = /tmp/mysql2.sock
port = 3307
pid-file = /usr/local/mysql/data2/mysql2.pid
datadir = /usr/local/mysql/data2
user = mysql
character-set-server = utf8
collation-server = utf8_general_ci
max_connections = 1024
log-error = /var/log/mysql2.log
[mysqld3]
socket = /tmp/mysql3.sock
port = 3308
pid-file = /usr/local/mysql/data3/mysql3.pid
datadir = /usr/local/mysql/data3
user = mysql
character-set-server = utf8
collation-server = utf8_general_ci
max_connections = 1024
log-error = /var/log/mysql3.log
加入環境變數
#export path=$path:/usr/local/mysql/bin
啟動服務1
#bin/mysqld_multi --mysqladmin=/usr/local/mysql/bin start 1
檢視狀態
#bin/mysqld_multi report
以上實驗不成功
可以複製多個my.conf檔案，改動埠 datadir socket pid-file log-error
#cp /usr/local/mysql/etc/my.conf /usr/local/mysql/etc/my1.conf
[mysqld]
daemonize = on
socket = /tmp/mysql1.sock
port = 3306
pid-file = /usr/local/mysql/data1/mysql1.pid
datadir = /usr/local/mysql/data1
user = mysql
character-set-server = utf8
collation-server = utf8_general_ci
max_connections = 1024
log-error = /var/log/mysql1.log
使用mysqld來啟動
#/usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/etc/my1.conf
#/usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/etc/my2.conf
#/usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/etc/my3.conf
連線資料庫
#mysql -uroot -p -s /tmp/mysql1.sock
#mysql -uroot -p -s /tmp/mysql2.sock
#mysql -uroot -p -s /tmp/mysql3.sock
修改密碼
#alter user 'root'@'localhost' identified by '!@laojke123';
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