今天查看系统日志发现大量的nf_conntrack: table full,
dropping packet. 错误
cat /var/log/messages | more
Jun 7
09:52:05 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:05 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:05 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:05 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:05
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:05 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:05 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:05 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:10 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:10
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:10 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:10 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:10 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:10 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:10
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:10 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:10 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:10 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:15 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:15
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:15 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:15 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:15 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:15 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:15
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:15 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:15 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:15 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:23 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:23
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:23 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:23 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:23 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:23 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:23
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:23 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:23 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:23 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:30 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:30
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:30 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:30 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:30 localhost kernel: nf_conntrack:
table full, dropping packet.
Jun 7 09:52:30 localhost kernel:
nf_conntrack: table full, dropping packet.
Jun 7 09:52:30
localhost kernel: nf_conntrack: table full, dropping packet.
Jun 7
09:52:30 localhost kernel: nf_conntrack: table full, dropping
packet.
Jun 7 09:52:30 localhost kernel: nf_conntrack: table full,
dropping packet.
Jun 7 09:52:30 localhost kernel: nf_conntrack:
table full, dropping packet.
解决办法：
vim
/etc/sysctl.conf
加入：
net.nf_conntrack_max =
655350
net.netfilter.nf_conntrack_tcp_timeout_established = 1200
CENTOS
6.1或以上版本使用：
net.netfilter.nf_conntrack_max =
655350
net.netfilter.nf_conntrack_tcp_timeout_established = 1200
保存后执行
sysctl -p 使之生效，然后观察该错误是不是没有了。
Dell 刀片服务器CentOS6.5mini开机20~30分钟宕机,布布扣,bubuko.com
Dell 刀片服务器CentOS6.5mini开机20~30分钟宕机
原文：http://www.cnblogs.com/hamy/p/3683343.html
