#替换成英文 sed -i 's#LANG="zh_CN.*"#LANG="en_US.UTF-8"#' /etc/sysconfig/i18n #替换成中文 sed -i 's#LANG="en_US.*"#LANG="zh_CN.UTF-8"#' /etc/sysconfig/i18n #替换成UTF-8中文 sed -i 's#LANG="zh_CN.*"#LANG="zh_CN.UTF-8"#' /etc/sysconfig/i18n
13、清理登陆的时候显示的系统及内核版本
#查看登陆信息 cat /etc/redhat-release cat /etc/issue #清理登陆信息 echo >/etc/redhat-release echo >/etc/issue
14、内核参数优化
vi /etc/sysctl.conf
#可用于apache，nginx，squid多种等web应用 net.ipv4.tcp_max_syn_backlog = 65536 net.core.netdev_max_backlog = 32768 net.core.somaxconn = 32768 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syn_retries = 2 net.ipv4.tcp_tw_recycle = 1 #net.ipv4.tcp_tw_len = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_max_orphans = 3276800 #net.ipv4.tcp_fin_timeout = 30 #net.ipv4.tcp_keepalive_time = 120 net.ipv4.ip_local_port_range = 1024 65535 #以下参数是对centos6.x的iptables防火墙的优化，防火墙不开会有提示，可以忽略不理。 #如果是centos5.X需要吧netfilter.nf_conntrack替换成ipv4.netfilter.ip #centos5.X为net.ipv4.ip_conntrack_max = 25000000 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
立即生效 /sbin/sysctl -p centos6.5可能会报错
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
出现这个的原因是，没有自动载入bridge桥接模块
modprobe bridge echo "modprobe bridge">> /etc/rc.local
查看桥接 lsmod|grep bridge
centos5.X可能会报错 这个错误可能是你的防火墙没有开启或者自动处理可载入的模块ip_conntrack没有自动载入，解决办法有二，一是开启防火墙，二是自动处理开载入的模块ip_conntrack
error: "net.ipv4.ip_conntrack_max"is an unknown key error: "net.ipv4.netfilter.ip_conntrack_max"is an unknown key error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_established"is an unknown key error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait"is an unknown key error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait"is an unknown key error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait"is an unknown key
centos5.X解决方法：
modprobe ip_conntrack echo "modprobe ip_conntrack">> /etc/rc.local
