刚开始编译安装MySQL的时候，都弄完了以后总是出错，很是郁闷，而且这个问题我在几个机器上都遇到过。今天查网络，终于弄明白是怎么回事了，原来是权限设置不对，虽然是所有者权限了，但是忘记设置所属组了。所以错在这里，望大家遇到童言的问题多检查检查，这么马虎，用了这么长时间才弄好，惭愧啊
以下是操作记录，从make install 完成以后开始记录，同时后边跟着一个网友的文章，忘记出处了。先拿过来写了。
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[root@localhost mysql]# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)
[root@localhost mysql]# service mysqld restart 这里说明mysqld并没有启动，
MySQL manager or server PID file could not be found! ? ? ? [FAILED]
Starting MySQL/etc/init.d/mysqld: line 159: kill: (18977) - No such process
?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? [FAILED]
[root@localhost mysql]# cd bin
[root@localhost bin]# ./mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111) ? ? ? ?这里就说了不能通过/tmp/mysql.sock连接数据库。
[root@localhost bin]# cd /tmp ? ?进去检查，看到有这个文件，所以看别的原因。
[root@localhost tmp]# ls
gconfd-root ?mapping-root ?mysql.sock ?mysql-test-ports ?mysql-test-ports.sem ?scim-panel-socket:0-root ?VMwareDnD ?vmware-root ?vmware.txt
[root@localhost tmp]# cd /usr/local/mysql/
[root@localhost mysql]# pwd
/usr/local/mysql
[root@localhost mysql]# chown -R root:mysql . ? ? ?忽然想起来了没有设置权限呢，开始设置权限
[root@localhost mysql]# ll
total 36
drwxr-xr-x 2 root mysql 4096 Nov 28 21:51 bin
drwxr-xr-x 3 root mysql 4096 Nov 28 21:50 include
drwxr-xr-x 2 root mysql 4096 Nov 28 21:50 info
drwxr-xr-x 3 root mysql 4096 Nov 28 21:50 lib
drwxr-xr-x 2 root mysql 4096 Nov 28 21:51 libexec
drwxr-xr-x 4 root mysql 4096 Nov 28 21:50 man
drwxr-xr-x 8 root mysql 4096 Nov 28 21:51 mysql-test
drwxr-xr-x 3 root mysql 4096 Nov 28 21:50 share
drwxr-xr-x 5 root mysql 4096 Nov 28 21:50 sql-bench
[root@localhost mysql]# chown -R mysql /var/lib/mysql
[root@localhost mysql]# cp share/mysql/my-huge.cnf /etc/my.cnf
[root@localhost mysql]# cp share/mysql/mysql.server /etc/rc.d/init.d/mysqld
[root@localhost mysql]# chmod 755 /etc/rc.d/init.d/mysqld
[root@localhost mysql]# chkconfig --add mysqld
[root@localhost mysql]# chkconfig --level 345 mysqld on
=======error========
[root@localhost mysql]# mysqladmin -u root password 'uplooking'
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)'
Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists! ?又是上边一样的错误
[root@localhost mysql]# bin/mysql start
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)
[root@localhost mysql]# /etc/rc.d/init.d/mysqld status