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
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 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 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)