【IT168 服务器学院】 安装过程没有出现出错的信息，安装完了，
　　　运行了mysql_install_db
　　　再运行 safe_mysqld,了，出现如下出错信息，
Starting mysqld daemon with databases from /usr/mysql/var
020620 14:51:32 mysqld ended

　　　查看mysql目录下var目录下的email.err文件，如下　
020612 11:38:56 mysqld started
020612 11:38:56 /usr/mysql/libexec/mysqld: Can''t create/write to file ''/usr/mysql/var/email.pid'' (Errcode: 13) //主机名为email
020612 11:38:56 /usr/mysql/libexec/mysqld: Can''t find file: ''./mysql/host.frm'' (errno: 13)
020612 11:38:56 /usr/mysql/libexec/mysqld: Error on delete of ''/usr/mysql/var/email.pid'' (Errcode: 13)
020612 11:38:56 mysqld ended

　　为什么会出现如下情况呢，请高手指正，

　　要添加mysql用户及组，具体用法如下

shell> ./configure --prefix=/usr/local/mysql
shell> make
shell> make install
shell> scripts/mysql_install_db
shell> chown -R root /usr/local/mysql
shell> chown -R mysql /usr/local/mysql/var
shell> chgrp -R mysql /usr/local/mysql
shell> cp support-files/my-medium.cnf /etc/my.cnf
shell> /usr/local/mysql/bin/safe_mysqld --user=mysql &