Ubuntu 12.04,安装了MySQL，完了之后，更改了字符编译，就报错。感觉很郁闷。
环境：
root@ubuntu:~# uname -a
Linux ubuntu 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
使用的 apt-get install mysql-server安装的，然后改变了一下默认的字符集，在/etc/mysql/my.cnf里面的[mysqld]和[client]里加了
default-character-set=utf8，重启就不行了。
root@ubuntu:~# service mysql start
start: Job failed to start
看了系统日志，报了以下内容
Jun 11 22:56:42 ubuntu kernel: [ 4051.584941] init: mysql main process (4021) terminated with status 7
Jun 11 22:56:42 ubuntu kernel: [ 4051.584981] init: mysql main process ended, respawning
Jun 11 22:56:43 ubuntu kernel: [ 4052.134766] init: mysql post-start process (4022) terminated with status 1
Jun 11 22:56:43 ubuntu kernel: [ 4052.154739] type=1400 audit(1339469803.511:40): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=4068 comm="apparmor_parser"
Jun 11 22:56:44 ubuntu kernel: [ 4053.619246] init: mysql main process (4072) terminated with status 7
Jun 11 22:56:44 ubuntu kernel: [ 4053.619296] init: mysql main process ended, respawning
Jun 11 22:56:45 ubuntu kernel: [ 4054.248707] init: mysql post-start process (4073) terminated with status 1
Jun 11 22:56:45 ubuntu kernel: [ 4054.269778] type=1400 audit(1339469805.627:41): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=4119 comm="apparmor_parser"
Jun 11 22:56:47 ubuntu kernel: [ 4055.733347] init: mysql main process (4123) terminated with status 7
Jun 11 22:56:47 ubuntu kernel: [ 4055.733389] init: mysql respawning too fast, stopped
root@ubuntu:~#
纠结了很长时间，今天无意中测试，意外解决了问题，呵呵，不得不说，RP爆发。
配置文件如下
root@ubuntu:/etc/mysql# cat /etc/mysql/my.cnf | grep -v '^#' [client] default-character-set=utf8 #这里其实不用指定的，如果要指定，要用这个指令。 port = 3306 socket = /var/run/mysqld/mysqld.sock [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] character_set_server=utf8 #要使用这个命令，default-character-set=utf8会报错 user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking bind-address = 127.0.0.1 key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 myisam-recover = BACKUP query_cache_limit = 1M query_cache_size = 16M expire_logs_days = 10 max_binlog_size = 100M [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] [isamchk] key_buffer = 16M !includedir /etc/mysql/conf.d/ root@ubuntu:/etc/mysql#
可以看出，在[client]和[myslqd]段中，设置字符编码使用的指令不一样。
然后重启mysql就可以了
root@ubuntu:/etc/mysql# service mysql restart mysql stop/waiting mysql start/running, process 6981 root@ubuntu:/etc/mysql# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 147 Server version: 5.5.22-0ubuntu1 (Ubuntu) Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show variables like '%char%'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ 8 rows in set (0.00 sec)
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