说明:本优化适合apache,nginx,squid多种等web应用,特殊的业务也可能需要略作调整。 wOLV?Vk
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[root@c64 ~]# vi /etc/sysctl.conf tI5*0
#by sun in 20131001 e_g&L)
net.ipv4.tcp_fin_timeout = 2 U#<{RqY
net.ipv4.tcp_tw_reuse = 1 `?f<hIJoz
net.ipv4.tcp_tw_recycle = 1 U* uMMb}$
net.ipv4.tcp_syncookies = 1 J|@D @\?7
net.ipv4.tcp_keepalive_time =600 ):A.A,skf
net.ipv4.ip_local_port_range = 4000 65000 N vTp1kI]
net.ipv4.tcp_max_syn_backlog = 16384 3+q-yP#X
net.ipv4.tcp_max_tw_buckets = 36000 P>$+XrTE
net.ipv4.route.gc_timeout = 100 "KSdC8MS
net.ipv4.tcp_syn_retries = 1 THB[(3q
net.ipv4.tcp_synack_retries = 1 3#GIZL}!x
net.core.somaxconn = 16384 . ~a~(|
net.core.netdev_max_backlog = 16384 9e}%2,
net.ipv4.tcp_max_orphans = 16384 [57`V&c5
#一下参数是对iptables防火墙的优化,防火墙不开会有提示,可以忽略不理。 \< a^5'
net.ipv4.ip_conntrack_max = 25000000 Ekh)l0
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net.ipv4.netfilter.ip_conntrack_max = 25000000 .q!i
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net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 180 /b/ 6*&
net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 120 ^+gD;a|t
net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 60 y{~tMpo<
net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 120 Rm6i[y&
[root@localhost ~]# sysctl –p #使配置文件生效 DJqJ6 z:'
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提示:由于CentOS6.X系统中的模块名不是ip_conntrack,而是nf_conntrack,所以在/etc/sysctl.conf优化时,需要把net.ipv4.netfilter.ip_conntrack_max 这种老的参数,改成net.netfilter.nf_conntrack_max这样才可以。 l-x-
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即对防火墙的优化,在5.8上是 OKk"S_`
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net.ipv4.ip_conntrack_max = 25000000 q!~DCv df
net.ipv4.netfilter.ip_conntrack_max = 25000000 TefPxvd
net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 180 rhly.f7N=A
net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 120 T21?~jS
net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 60 zJ:%iL@
net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 120 <'7s3
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在6.4上是 oTcf[<
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net.nf_conntrack_max = 25000000 Kltqe5
net.netfilter.nf_conntrack_max = 25000000 k2PK4Ua_}q
net.netfilter.nf_conntrack_tcp_timeout_established = 180 9wO2`e )
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120 ?,%PemN
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60 PAxR?2m{
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120 ZvO1=*
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6.4版本上 OPogH=vf
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error: "net.bridge.bridge-nf-call-ip6tables"isan unknown key 6K=}n] n
error: "net.bridge.bridge-nf-call-iptables"isan unknown key UFUEY/q
error: "net.bridge.bridge-nf-call-arptables"isan unknown key 9U=6l]Np
这个错误是由于自动处理可载入的模块bridge没有自动载入,解决办法是自动处理开载入的模块ip_conntrack q9a6s{,
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modprobe bridge echo "modprobe bridge">> /etc/rc.local