## 本人在测试机上测试过，效果不错

fs.file-max = 6553600
net.ipv4.ip_local_port_range = 1024	65000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_max_tw_buckets = 65536
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
kernel.core_uses_pid = 1
kernel.sem = 250 32000 100 128
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.somaxconn = 262144
net.core.netdev_max_backlog = 262144

前面net.ipv4.tcp_max_tw_buckets是调为6000的，在做web压力测试时候，系统日志狂报：

kernel: TCP: time wait bucket table overflow

所以就直接改为65536了。

如果发现报：

error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key

error: "net.bridge.bridge-nf-call-iptables" is an unknown key

error: "net.bridge.bridge-nf-call-arptables" is an unknown key

只要加载bridge模块就可以了：

[root@node2 ]# modprobe bridge

[root@node2 ]# sysctl -p