tailfvar/log/xxx.log报错，Nospaceleftondevice

tail -f /var/log/xxx.log报错，No space left on device
tail -f /var/log/xxx.log报错，No space left on device
但磁盘还有很多空间剩余，inode也没耗尽
具体报错是：tail -f messages
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: Listen normally on 1 lo 127.0.0.1 UDP 123
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: Listen normally on 2 eth0 10.173.21.147 UDP 123
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: Listen normally on 3 eth1 123.57.48.200 UDP 123
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: peers refreshed
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: Listening on routing socket on fd #20 for interface updates
Dec  3 21:54:12 iZ25meqyotrZ ntpd[917]: restrict: error in address '::' on line 17. Ignoring...
Dec  3 21:54:17 iZ25meqyotrZ kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
Dec  3 21:54:17 iZ25meqyotrZ kernel: nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
Dec  3 21:55:08 iZ25meqyotrZ kernel: EXT4-fs (xvdb1): mounted filesystem with ordered data mode. Opts:
tail: cannot watch `messages': No space left on device


解决方案：
/etc/sysctl.conf文件里加fs.inotify.max_user_watches=100000
/sbin/sysctl -p