Centos6.6系统基础优化,centos6.6基础优化

Centos6.6系统基础优化,centos6.6基础优化

网络设置：

setup设置网络

vi/etc/sysconfig/netwrok-scripts/ifcfg-eth0

删除HWADDR和UUID行

dns：/etc/resolv.conf

linux版本，内核查看

cat/etc/redhat-release

uname-r

uname-m

SELINUX

[root@lufengcentos~]#sed-i's/SELINUX=enforcing/SELINUX=disabled/'/etc/selinux/config

[root@lufengcentos~]#setenforce0

[root@lufengcentos~]#getenforce

开机自启动

[root@lufengcentos~]#foroldboyin`chkconfig--list|grep3:on|awk'{print$1}'`;dochkconfig--level3$oldboyoff;done

[root@lufengcentos~]#foroldboyincrondnetworkrsyslogsshdsysstat;dochkconfig--level3$oldboyon;done

[root@lufengcentos~]#chkconfig--list|grep3:on

防火墙

[root@lufengcentos~]#/etc/init.d/iptablesstop

iptables:SettingchainstopolicyACCEPT:filter[OK]

iptables:Flushingfirewallrules:[OK]

iptables:Unloadingmodules:[OK]

中文字符

[root@lufengcentos~]#cat/etc/sysconfig/i18n

LANG="en_US.UTF-8"

SYSFONT="latarcyrheb-sun16"

[root@lufengcentos~]#cp/etc/sysconfig/i18n/etc/sysconfig/i18n.ori

[root@lufengcentos~]#echo'LANG="zh_CN.UTF-8"'>/etc/sysconfig/i18n

[root@lufengcentos~]#source/etc/sysconfig/i18n

[root@lufengcentos~]#echo$LANG

时间同步

[root@lufengcentos~]#echo'#timesyncbylufeng@2017-3-14'>>/var/spool/cron/root

[root@lufengcentos~]#echo'*/5****/usr/sbin/ntpdatetime.nist.gov'>/dev/null2>&1>>/var/spool/cron/root

[root@lufengcentos~]#crontab-l

#timesyncbylufeng@2017-3-14

*/5****/usr/sbin/ntpdatetime.nist.gov

文件描述符设置

[root@lufengcentos~]#ulimit-n

1024

[root@lufengcentos~]#vim/etc/security/limits.conf

*-nofile65535

内核优化

[root@lufengcentos~]#vi/etc/sysctl.conf

net.ipv4.tcp_syn_retries=1

net.ipv4.tcp_synack_retries=1

net.ipv4.tcp_keepalive_time=600

net.ipv4.tcp_keepalive_probes=3

net.ipv4.tcp_keepalive_intvl=15

net.ipv4.tcp_retries2=5

net.ipv4.tcp_fin_timeout=2

net.ipv4.tcp_max_tw_buckets=36000

net.ipv4.tcp_tw_recycle=1

net.ipv4.tcp_tw_reuse=1

net.ipv4.tcp_max_orphans=32768

net.ipv4.tcp_syncookies=1

net.ipv4.tcp_max_syn_backlog=16384

net.ipv4.tcp_wmem=819213107216777216

net.ipv4.tcp_rmem=3276813107216777216

net.ipv4.tcp_mem=78643210485761572864

net.ipv4.ip_local_port_range=102465000

net.ipv4.ip_conntrack_max=65536

net.ipv4.netfilter.ip_conntrack_max=65536

net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=180

net.core.somaxconn=16384

net.core.netdev_max_backlog=16384

[root@lufengcentos~]#sysctl-p