周海汉 (http://abloz.com) 2012.11.25
ubuntu 12.04所带的mysql 5.5，在/etc/mysql/my.cnf的[mysqld]中添加default-character-set=utf8 以支持utf8会导致msql无法启动。 在my.cnf的[mysqld]中添加 log_error = /var/log/mysql/error.log 重启后可以看到如下错误： root@ubuntu:~# service mysql start
start: Job failed to start root@ubuntu:~# root@ubuntu:~# cat /var/log/mysql/error.log 121125 17:07:38 [Note] Plugin ‘FEDERATED’ is disabled. 121125 17:07:38 InnoDB: The InnoDB memory heap is disabled 121125 17:07:38 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121125 17:07:38 InnoDB: Compressed tables use zlib 1.2.3.4 121125 17:07:38 InnoDB: Initializing buffer pool, size = 128.0M 121125 17:07:38 InnoDB: Completed initialization of buffer pool 121125 17:07:38 InnoDB: highest supported file format is Barracuda. 121125 17:07:39 InnoDB: Waiting for the background threads to start 121125 17:07:40 InnoDB: 1.1.8 started; log sequence number 2054581 121125 17:07:40 [ERROR] /usr/sbin/mysqld: unknown variable ‘default-character-set=utf8’ 121125 17:07:40 [ERROR] Aborting
121125 17:07:40 InnoDB: Starting shutdown… 121125 17:07:40 InnoDB: Shutdown completed; log sequence number 2054581 121125 17:07:40 [Note] /usr/sbin/mysqld: Shutdown complete
原来mysql 5.5不再支持default-character-set=utf8，而是改为支持character-set-server=utf8 最后，将my.cnf中utf8支持改为如下内容，启动成功： [client] default-character-set=utf8 [mysqld] init_connect=’SET collation_connection = utf8_unicode_ci’ init_connect=’SET NAMES utf8’ character-set-server=utf8 collation-server=utf8_unicode_ci skip-character-set-client-handshake
参考： bug报告和诊断：https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/1081675 utf8配置参考：http://www.onaxer.com/tag/change-mysql-default-character-set-to-utf8-in-mysql-5-5/
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