Mysql多實例之mysqld multi

相關軟件

注：mysql採用二進制安裝爲最佳！rpm安裝坑爹啊!
yum install -y wget gcc-c++ make ncurses ncurses-devel perl
wget -c ftp://ftp.mirrorservice.org/sites/ftp.mysql.com/Downloads/MySQL-5.1/mysql-5.1.60.tar.gz

安裝

tar -zxv -f mysql-5.1.60.tar.gz
./configure --prefix=/usr/local/mysql --with-charset=utf8 --with-extra-charset=all --enable-thread-safe-client --enable-assembler 
--with-readline --with-big-tables --with-named-curses-libs=/usr/lib64/libncursesw.so(注：根據具體情況編輯路徑即可)
make && make install（make install到第四步會有幾分鐘停頓！請淡定！）

添加用戶和用戶組

groupadd mysql #添加mysql用戶組
useradd -g mysql mysql #創建mysql用戶並把它放到mysql組下   
chown -R root:mysql /usr/local/mysql #修改mysql文件屬性  
#把用到的工具添加到/usr/bin目錄   
ln -s /usr/local/mysql/bin/mysqld_multi /usr/bin/mysqld_multi   
ln -s /usr/local/mysql/bin/mysql_install_db /usr/bin/mysql_install_db

初始化數據目錄

mysql_install_db --datadir=/usr/local/var/mysql1 --user=mysql   
mysql_install_db --datadir=/usr/local/var/mysql2 --user=mysql   
mysql_install_db --datadir=/usr/local/var/mysql3 --user=mysql   
mysql_install_db --datadir=/usr/local/var/mysql4 --user=mysql

配置多實例啓動腳本

#修改屬性   
chown -R mysql /usr/local/var/mysql1    
chown -R mysql /usr/local/var/mysql2   
chown -R mysql /usr/local/var/mysql3    
chown -R mysql /usr/local/var/mysql4   
從MySQL的源碼中把mysql-5.1.60/support-files/mysqld_multi.server複製到/etc/init.d/目錄下
vi /etc/init.d/mysqld_multi.server
#修改basedir和bindir爲安裝路徑   
basedir=/usr/local/mysql   
bindir=/usr/local/mysql/bin

配置多實例數據庫配置文件

在/etc/目錄下創建創建文件/etc/mysqld_multi.cnf，把mysqld_multi --example產生的文件粘進去，修改相應屬性，如：mysqld,mysqladmin,socket,port,pid-file,datadir,user等。
執行mysqld_multi --example
將內容複製到/etc/mysqld_multi.cnf
修改之後
[mysqld_multi]   
mysqld     = /usr/local/mysql/bin/mysqld_safe   
mysqladmin = /usr/local/mysql/bin/mysqladmin   
#user       = mysql   
#password   = my_password   
 
[mysqld1]   
socket     = /usr/local/var/mysql1/mysql1.sock   
port       = 3306  
pid-file   = /usr/local/var/mysql1/mysql1.pid   
datadir    = /usr/local/var/mysql1   
#language   = /usr/local/mysql/share/mysql/english   
user       = mysql   
 
[mysqld2]   
socket     = /usr/local/var/mysql2/mysql2.sock   
port       = 3307  
pid-file   = /usr/local/var/mysql2/mysql2.pid   
datadir    = /usr/local/var/mysql2   
#language   = /usr/local/mysql/share/mysql/english   
user       = mysql   
 
[mysqld3]   
socket     = /usr/local/var/mysql3/mysql3.sock   
port       = 3308  
pid-file   = /usr/local/var/mysql3/mysql3.pid   
datadir    = /usr/local/var/mysql3   
#language   = /usr/local/mysql/share/mysql/english   
user       = mysql   
 
[mysqld4]   
socket     = /usr/local/var/mysql4/mysql4.sock   
port       = 3309  
pid-file   = /usr/local/var/mysql4/mysql4.pid   
datadir    = /usr/local/var/mysql4   
#language   = /usr/local/mysql/share/mysql/english   
user       = mysql

啓動多實例數據庫

將/usr/local/mysql/bin加到$PATH環境變量裏   
export PATH=/usr/local/mysql/bin:$PATH 
#查看數據庫狀態   
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf report   
#結果都爲沒有運行   
Reporting MySQL servers   
MySQL server from group: mysqld1 is not running   
MySQL server from group: mysqld2 is not running   
MySQL server from group: mysqld3 is not running   
MySQL server from group: mysqld4 is not running   
 
#啓動   
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf start   
#結果爲   
Reporting MySQL servers   
MySQL server from group: mysqld1 is not running   
MySQL server from group: mysqld2 is not running   
MySQL server from group: mysqld3 is not running   
MySQL server from group: mysqld4 is not running   
 
#啓動具體某一個實例可在start、stop後面加上具體數據1,2,3等

查看運行結果

#查看相應端口是否已經被監聽   
netstat -tunlp   
#查看是否有活動進程   
ps -aux|grep mysql

登錄相應數據庫

#進入端口爲3306的數據庫   
mysql -uroot -p -h127.0.0.1 -P3306   
#通過sock文件登錄   
mysql -uroot -p -S /usr/local/var/mysql1/mysql1.sock   
#查看socket文件   
mysql> SHOW VARIABLES LIKE 'socket';   
#查看pid文件   
mysql> SHOW VARIABLES LIKE '%pid%';