《Mysql入門使用mysqld_multi實現單系統中配置多個MySQL服務器實例》要點：
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本文講應用MySQL源碼安裝MySQL并用mysqld_multi配置多實例.MYSQL學習
1、下載MySQL源碼安裝版本MYSQL學習
到MySQL官網查找到相應版本下載,本文下載的是5.1版本MYSQL學習
代碼如下:
wget -c ftp://ftp.mirrorservice.org/sites/ftp.mysql.com/Downloads/MySQL-5.1/mysql-5.1.60.tar.gz?
2、解壓安裝MYSQL學習
代碼如下:
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/lib/libncursesw.so.5?
?
make && make install?
3、添加用戶和用戶組MYSQL學習
代碼如下:
groupadd mysql #添加mysql用戶組?
useradd -g mysql mysql #創立mysql用戶并把它放到mysql組下?
chown -R root:mysql /usr/local/mysql #修改mysql文件屬性?
4、初始化數據目錄MYSQL學習
代碼如下:
#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?
?
#初始化四個數據目錄?
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?
?
#改動屬性?
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??
5、配置多實例啟動腳本MYSQL學習
??? 從MySQL的源碼中把復制到/etc/init.d/目次下MYSQL學習
代碼如下:
cp /usr/local/src/mysql-5.1.60/support-files/mysqld_multi.server /etc/init.d/mysqld_multi.server?
?
#改動basedir和bindir為安裝路徑?
basedir=/usr/local/mysql?
bindir=/usr/local/mysql/bin?
6、配置多實例數據庫配置文件MYSQL學習
用mysqld_multi工具查看該配置文件的模板辦法,命令為：mysqld_multi --example
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.
MYSQL學習
代碼如下:
[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?
7、啟動多實例數據庫
MYSQL學習
代碼如下:
將/usr/local/mysql/bin加到$PATH環境變量里?
export PATH=/usr/local/mysql/bin:$PATH?
?
#查看數據庫狀態?
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf report?
#成果都為沒有運行?
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?
?
#啟動?
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf start?
#成果為?
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?
?
#啟動具體某一個實例可在start、stop后面加上具體數據1,2,3等?
8、查看運行成果MYSQL學習
代碼如下:
#查看相應端口是否已經被監聽?
netstat -tunlp?
?
#查看是否有活動過程?
ps -aux|grep mysql?
9、登錄相應數據庫MYSQL學習
代碼如下:
#進入端口為3306的數據庫?
mysql -uroot -p -h127.0.0.1 -P3306?
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#經由過程sock文件登錄?
mysql -uroot -p -S /usr/local/var/mysql1/mysql1.sock?
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?#查看socket文件?
mysql> SHOW VARIABLES LIKE 'socket';?
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#查看pid文件?
mysql> SHOW VARIABLES LIKE '%pid%';?
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