centos7.x内核参数优化脚本

cat <<eof> /etc/sysctl.d/sysctl.conf
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_keepalive_time =600
net.ipv4.ip_local_port_range = 4000    65000
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
net.ipv4.tcp_max_orphans = 16384
net.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_tcp_timeout_established = 180
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120
#以下2条是docker优化选项
#net.bridge.bridge-nf-call-iptables = 1
#net.bridge.bridge-nf-call-ip6tables = 1
eof
modprobe ip_conntrack && modprobe bridge
chmod +x /etc/rc.d/rc.local
echo "modprobe ip_conntrack" >> /etc/rc.local
echo "modprobe bridge" >> /etc/rc.local
/sbin/sysctl -p /etc/sysctl.d/sysctl.conf