ubuntu8.04~8.10安装默认的mysql,不能运行mysql_install_db,不能使用mysqld_multi的罪魁是AppArmor,什么是AppArmor(传送门),不能访问的出错结果是因为apparmor控制了对multi实例的数据目录的访问权限
出错代码:
>> sudo mysql_install_db --datadir
=
/var/lib/mysql1 --no-defaults --user=mysql
Installing MySQL system tables...
100304
22:
34:
18
[Warning] Can't create test file /var/lib/mysql1/PB.lower-test
100304
22:
34:
18
[Warning] Can't create test file /var/lib/mysql1/PB.lower-test
ERROR:
1005 Can't create table 'db'
(errno:
13
)
100304
22:
34:
18
[ERROR] Aborting
解决办法:
编辑/etc/apparmor.d/usr.sbin.mysqld这个文件,可以看到默认apt-get安装的mysql对应的数据目录和日志以及socket,pid文件的权限都是存在的,如法炮制,修改配置文件如下:
/etc
/mysql
/*.pem r,
/etc
/mysql
/conf.d
/ r,
/etc
/mysql
/conf.d
/* r,
/etc
/mysql
/my.cnf r,
/usr
/sbin
/mysqld mr,
/usr
/share
/mysql
/** r,
/var
/log
/mysql.log rw,
/var
/log
/mysql.err rw,
/var
/lib
/mysql
/ r,
/var
/lib
/mysql
/** rwk,
/var
/log
/mysql
/ r,
/var
/log
/mysql
/* rw,
/var
/run
/mysqld
/mysqld.pid
w,
/var
/run
/mysqld
/mysqld.sock
w,
/var
/log
/mysql1.log rw,
/var
/log
/mysql1.err rw,
/var
/lib
/mysql1
/ r,
/var
/lib
/mysql1
/** rwk,
/var
/log
/mysql1
/ r,
/var
/log
/mysql1
/* rw,
/var
/run
/mysqld
/mysqld1.pid
w,
/var
/run
/mysqld
/mysqld1.sock
w,
/var
/log
/mysql2.log rw,
/var
/log
/mysql2.err rw,
/var
/lib
/mysql2
/ r,
/var
/lib
/mysql2
/** rwk,
/var
/log
/mysql2
/ r,
/var
/log
/mysql2
/* rw,
/var
/run
/mysqld
/mysqld2.pid
w,
/var
/run
/mysqld
/mysqld2.sock
w,
修改完这个文件后sudo /etc/init.d/apparmor restart,重启apparmor
继续运行 sudo mysql_install_db –datadir=/var/lib/mysql1 –no-defaults –user=mysql
这样就能安装mysql的系统数据文件到/var/lib/mysql1下面了
配置多个实例很简单:编辑/etc/mysql/my.cnf
[mysqld_multi]
mysqld
=
/usr/bin/mysqld_safe
mysqladmin
=
/usr/bin/mysqladmin
user
=
root
password
=
123
[mysqld1]
pid-file
=
/var/run/mysqld/mysqld1.pid
socket
=
/var/run/mysqld/mysqld1.sock
port
=
3306
datadir
=
/var/lib/mysql1
user
=
mysql
log
=
/var/log/mysql1.log
[mysqld2]
pid-file
=
/var/run/mysqld/mysqld2.pid
socket
=
/var/run/mysqld/mysqld2.sock
port
=
3307
datadir
=
/var/lib/mysql2
user
=
mysql
log
=
/var/log/mysql2.log
运行sudo mysqld_multi start 1,2 –no-log,就能见到终端输出正确的启动信息了
~/home/pb$ netstat -lt | grep 33
tcp 0 0 *:3307 *:* LISTEN
tcp 0 0 *:3308 *:* LISTEN