Linux內核參數調優主要是通過修改/proc偽文件系統和/etc/sysctl.conf配置文件的參數來實現的。

/proc目錄結構如下：

/proc/driver? ? ????與驅動器相關的信息

/proc/fs????????????文件系統參數

/proc/net????? ?????網絡信息

/proc/pid????? ?????每個進程的信息

/proc/sys???????? ? 內核參數

/proc/scsi???? ?????與scsi相關的信息

/proc/sys/kernel?? ?通用內核參數

/proc/sys/vm???? ? ?內存管理參數

/proc/sys/dev???? ? 與設備相關的信息

/proc/sys/net????? ?網絡信息

vim /etc/sysctl.conf

net.ipv4.tcp_syncookies = 1????????????#開啟SYN Cookies。可以防范少量的SYN攻擊。

net.ipv4.ip_local_port_range = 10000 65535 #設置向外連接的端口范圍

net.ipv4.route.gc_timeout = 100????????#路由緩存刷新頻率

net.core.netdev_max_backlog = 16384? ? #允許排隊更多的報文

net.core.somaxconn = 16384???????????? #指定更大的accept隊列backlog

net.ipv4.tcp_max_syn_backlog = 16384? ?#增加SYN隊列長度

net.ipv4.tcp_synack_retries = 1????????#重新發送響應的次數

net.ipv4.tcp_retries2 = 5???????????? ?#向遠程主機重新發送數據的次數

net.ipv4.tcp_keepalive_time = 1200???? #內核向遠程主機發送Keepalive消息的頻度

net.ipv4.tcp_keepalive_intvl = 30????? #內核向遠程主機發送探測消息的間隔

系統優化腳本：

#!/bin/bash

yum -y groupinstall "Development tools"

cd /usr/local/src

wget https://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

rpm -ivh epel-release-6-8.noarch.rpm

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

sed -i 's/start on control-alt-delete/#start on control-alt-delete/' /etc/init/control-alt-delete.conf

sed -i 's@exec /sbin/shutdown -r now "Control-Alt-Delete pressed"@#exec /sbin/shutdown -r now "Control-Alt-Delete pressed"@' /etc/init/control-alt-delete.conf

service iptables stop

chkconfig iptables off

ulimit -SHn 65534

echo "ulimit -SHn 65534" >> /etc/rc.local

cat >> /etc/sysctl.conf << EOF

net.ipv4.tcp_syncookies = 1

net.ipv4.ip_local_port_range = 10000 65535

net.ipv4.route.gc_timeout = 100

net.core.netdev_max_backlog = 16384

net.core.somaxconn = 16384

net.ipv4.tcp_max_syn_backlog = 16384

net.ipv4.tcp_synack_retries = 1

net.ipv4.tcp_retries2 = 5

net.ipv4.tcp_keepalive_time = 1200

net.ipv4.tcp_keepalive_intvl = 30

EOF

/sbin/sysctl -p

for i in `chkconfig | grep 3:on | awk '{print $1}'`

do

chkconfig --level 3 $i off

done

for service in crond rsyslog sshd network

do

chkconfig --level 3 $service on

done

reboot

總結

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