151226 17:49:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist
151226 17:49:20 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
151226 17:49:20  InnoDB: Initializing buffer pool, size = 8.0M
151226 17
 
:49:20  InnoDB: Completed initialization of buffer pool
InnoDB: Log scan progressed past the checkpoint lsn 0 37356
151226 17:49:20  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from
 
 the doublewrite
InnoDB: buffer...
InnoDB: Doing recovery: scanned up to log sequence number 0 44233
151226 17:49:20  InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percents: 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
 
 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 
InnoDB: Apply batch completed
151226 17:49:21  InnoDB: Started; log sequence number 0 44233
151226 17:49:21 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
151226 17:49:21 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

因為/etc/my.cnf
裡面設定字符集的時候順手寫了個utf-8，然後初始化資料庫的時候就報錯了。utf-8之間的一橫是不能加的。加了之後就不對了，提示這個

151226 17:45:28 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
^G/usr/libexec/mysqld: Character set 'utf-8' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file
151226 17:45:28 [ERROR] Aborting

151226 17:45:28 [Note] /usr/libexec/mysqld: Shutdown complete

151226 17:45:28 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

然後就只有刪除資料庫了

rm -rf /var/lib/mysql

很不巧的是我cd到了/var/lib/mysql
然後重啟的時候

[root@xuegod83 mysql]# service mysqld restart
shell-init: error retrieving current directory: getcwd: cannot access parent directories: 沒有那個檔案或目錄
chdir: error retrieving current directory: getcwd: cannot access parent directories: 沒有那個檔案或目錄
停止 mysqld：                                              [確定]
正在啟動 mysqld：                                          [確定]

就提示了這個錯誤，以為是mysql配置檔案哪裡寫錯了。查了下才知道因為把/var/lib/mysql 刪除了，導致當前所在位置已經不存在了。刪除這個資料夾也是為了解決那個初始化的時候的錯誤。之前看這個資料夾是有東西，刪除了之後重新的時候的時候沒報錯，但這個資料夾也沒生成東西了，不知道會不會出問題。

緊著著連線資料庫的時候就報錯了

[root@xuegod83 ~]# mysql -uroot -pwangjun1009
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

我就手動建立了原來刪除的/var/lib/mysql 然後改許可權

[root@xuegod83 ~]# mkdir /var/lib/mysql
[root@xuegod83 ~]# chown mysql:mysql -R /var/lib/mysql/ 

然後重啟服務

[[email protected] ~]# service mysqld restart
停止 mysqld：                                              [確定]
初始化 MySQL 資料庫： WARNING: The host 'xuegod83' could not be looked up with resolveip.
This probably means that your libc libraries are not 100 % compatible
with this binary MySQL version. The MySQL daemon, mysqld, should work
normally with the exception that host name resolving will not work.
This means that you should use IP addresses instead of hostnames
when specifying MySQL privileges !
Installing MySQL system tables...
OK
Filling help tables...
OK

To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h xuegod83 password 'new-password'

Alternatively you can run:
/usr/bin/mysql_secure_installation

which will also give you the option of removing the test
databases and anonymous user created by default.  This is
strongly recommended for production servers.

See the manual for more instructions.

You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &

You can test the MySQL daemon with mysql-test-run.pl
cd /usr/mysql-test ; perl mysql-test-run.pl

Please report any problems with the /usr/bin/mysqlbug script!

                                                           [確定]
正在啟動 mysqld：                                          [確定]

不出所料，這才是初始化了資料庫

[[email protected] ~]# ll /var/lib/mysql/
總用量 20488
-rw-rw---- 1 mysql mysql 10485760 12月 26 18:06 ibdata1
-rw-rw---- 1 mysql mysql  5242880 12月 26 18:06 ib_logfile0
-rw-rw---- 1 mysql mysql  5242880 12月 26 18:06 ib_logfile1
drwx------ 2 mysql mysql     4096 12月 26 18:06 mysql
srwxrwxrwx 1 mysql mysql        0 12月 26 18:06 mysql.sock
drwx------ 2 mysql mysql     4096 12月 26 18:06 test