Centos6.6 Basic System Optimization

Centos6.6 Basic System Optimization
Network settings:Setupvi/etc/sysconfig/netwrok-scripts/ifcfg-eth0Delete HWADDR and UUID rowsdns：/etc/resolv.confLinux version, kernel Viewcat/etc/redhat-releaseuname-runame-mSELINUX[root@lufengcentos~]#sed-i's/SELINUX=enforcing/SELINUX=disabled/'/etc/selinux/config[root@lufengcentos~]#setenforce0[root@lufengcentos~]#getenforceAuto-start[root@lufengcentos~]#foroldboyin`chkconfig--list|grep3:on|awk'{print$1}'`;dochkconfig--level3$oldboyoff;done[root@lufengcentos~]#foroldboyincrondnetworkrsyslogsshdsysstat;dochkconfig--level3$oldboyon;done[root@lufengcentos~]#chkconfig--list|grep3:onFirewall[root@lufengcentos~]#/etc/init.d/iptablesstopiptables:SettingchainstopolicyACCEPT:filter[OK]iptables:Flushingfirewallrules:[OK]iptables:Unloadingmodules:[OK]Chinese characters[root@lufengcentos~]#cat/etc/sysconfig/i18nLANG="en_US.UTF-8"SYSFONT="latarcyrheb-sun16"[root@lufengcentos~]#cp/etc/sysconfig/i18n/etc/sysconfig/i18n.ori[root@lufengcentos~]#echo'LANG="zh_CN.UTF-8"'>/etc/sysconfig/i18n[root@lufengcentos~]#source/etc/sysconfig/i18n[root@lufengcentos~]#echo$LANGTime Synchronization[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.govFile descriptor settings[root@lufengcentos~]#ulimit-n1024[root@lufengcentos~]#vim/etc/security/limits.conf*-nofile65535Kernel Optimization[root@lufengcentos~]#vi/etc/sysctl.confnet.ipv4.tcp_syn_retries=1net.ipv4.tcp_synack_retries=1net.ipv4.tcp_keepalive_time=600net.ipv4.tcp_keepalive_probes=3net.ipv4.tcp_keepalive_intvl=15net.ipv4.tcp_retries2=5net.ipv4.tcp_fin_timeout=2net.ipv4.tcp_max_tw_buckets=36000net.ipv4.tcp_tw_recycle=1net.ipv4.tcp_tw_reuse=1net.ipv4.tcp_max_orphans=32768net.ipv4.tcp_syncookies=1net.ipv4.tcp_max_syn_backlog=16384net.ipv4.tcp_wmem=819213107216777216net.ipv4.tcp_rmem=3276813107216777216net.ipv4.tcp_mem=78643210485761572864net.ipv4.ip_local_port_range=102465000net.ipv4.ip_conntrack_max=65536net.ipv4.netfilter.ip_conntrack_max=65536net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=180net.core.somaxconn=16384net.core.netdev_max_backlog=16384[root@lufengcentos~]#sysctl-p