mysql启动失败

查看mysqld.log

/opt/redmine-2.6.0-1/mysql/bin/mysqld.bin: Error writing file '/opt/redmine-2.6.0-1/mysql/data/mysqld.pid' (Errcode: 28)
Can't start server: can't create PID file: No space left on device

用df -h 查看
文件系统       容量  已用  可用 已用%% 挂载点
/dev/mapper/VolGroup-lv_root
                       36G   34G     0 100% /
tmpfs                 2.0G     0  2.0G   0% /dev/shm
/dev/sda1             485M   37M  423M   9% /boot

磁盘空间不足

查询大于100M文件，删除
find / -size +100000000c

重启mysql即可