重启服务器出现：
[root@iZ94hr99do9Z ~]# service nginx restart
Stoping nginx... done
Starting nginx... done
nginx: [crit] pwrite() "/usr/local/nginx/logs/nginx.pid" failed (28: No space left on device)
问题分析：
这是在告诉你服务器磁盘满了，需要清理或者开放空间磁盘大小！
解决方案：
[root@iZ94hr99do9Z ~]# free -h
[root@iZ94hr99do9Z ~]# sync
[root@iZ94hr99do9Z ~]# echo 1 > /proc/sys/vm/drop_caches
[root@iZ94hr99do9Z ~]# echo 2 > /proc/sys/vm/drop_caches
[root@iZ94hr99do9Z ~]# echo 3 > /proc/sys/vm/drop_caches
[root@iZ94hr99do9Z ~]# service nginx restart
完美解决！！！
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