Centos6.6 Basic System Optimization
Network settings:
Setup
vi
/etc/sysconfig/netwrok-scripts/ifcfg-eth0
Delete HWADDR and UUID rows
dns:
/etc/resolv
.conf
Linux version, kernel View
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
Auto-start
[root@lufengcentos~]
#foroldboyin`chkconfig--list|grep3:on|awk'{print$1}'`;dochkconfig--level3$oldboyoff;done
[root@lufengcentos~]
#foroldboyincrondnetworkrsyslogsshdsysstat;dochkconfig--level3$oldboyon;done
[root@lufengcentos~]
#chkconfig--list|grep3:on
Firewall
[root@lufengcentos~]
#/etc/init.d/iptablesstop
iptables:SettingchainstopolicyACCEPT:filter[OK]
iptables:Flushingfirewallrules:[OK]
iptables:Unloadingmodules:[OK]
Chinese characters
[root@lufengcentos~]
#cat/etc/sysconfig/i18n
LANG=
"en_US.UTF-8"
SYSFONT=
"latarcyrheb-sun16"
[root@lufengcentos~]
#cp/etc/sysconfig/i18n/etc/sysconfig/i18n.ori
[root@lufengcentos~]
#echo'LANG="zh_CN.UTF-8"'>/etc/sysconfig/i18n
[root@lufengcentos~]
#source/etc/sysconfig/i18n
[root@lufengcentos~]
#echo$LANG
Time 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/ntpdate
time
.nist.gov
File descriptor settings
[root@lufengcentos~]
#ulimit-n
1024
[root@lufengcentos~]
#vim/etc/security/limits.conf
*-nofile65535
Kernel Optimization
[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