centos6.5(64位)系统优化

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by-xiao酱沫

@Author: 875358601@qq.com @DateTime: 2016-12-17 19:54:20

关闭不需要的服务


service acpid off

service atd stop

service auditd stop

service avahi-daemon stop

service avahi-dnsconfd stop

service bluetooth stop

service conman stop

service cpuspeed stop

service cups stop

service dnsmasq stop

service dund stop

service firstboot stop

service hidd stop

service httpd stop

service ibmasm stop

service ip6tables stop

service irda stop

service kdump stop

service lm_sensors stop

service mcstrans stop

service messagebus stop

service microcode_ctl stop

service netconsole stop

service netfs stop

service netplugd stop

service nfs stop

service nfslock stop

service nscd stop

service ntpd stop

service oddjobd stop

service pand stop

service pcscd stop

service portmap stop

service psacct stop

service rdisc stop

service restorecond stop

service rpcgssd stop

service rpcidmapd stop

service rpcsvcgssd stop

service saslauthd stop

service sendmail stop

service setroubleshoot stop

service smb stop

service vncserver stop

service winbind stop

service wpa_supplicant stop

service xfs stop

service ypbind stop

service yum-updatesd stop

chkconfig acpid off

chkconfig atd off

chkconfig auditd off

chkconfig avahi-daemon off

chkconfig avahi-dnsconfd off

chkconfig bluetooth off

chkconfig conman off

chkconfig cpuspeed off

chkconfig cups off

chkconfig dnsmasq off

chkconfig dund off

chkconfig firstboot off

chkconfig hidd off

chkconfig httpd off

chkconfig ibmasm off

chkconfig ip6tables off

chkconfig irda off

chkconfig kdump off

chkconfig lm_sensors off

chkconfig mcstrans off

chkconfig messagebus off

chkconfig microcode_ctl off

chkconfig netconsole off

chkconfig netfs off

chkconfig netplugd off

chkconfig nfs off

chkconfig nfslock off

chkconfig nscd off

chkconfig ntpd off

chkconfig oddjobd off

chkconfig pand off

chkconfig pcscd off

chkconfig portmap off

chkconfig psacct off

chkconfig rdisc off

chkconfig restorecond off

chkconfig rpcgssd off

chkconfig rpcidmapd off

chkconfig rpcsvcgssd off

chkconfig saslauthd off

chkconfig sendmail off

chkconfig setroubleshoot off

chkconfig smb off

chkconfig vncserver off

chkconfig winbind off

chkconfig wpa_supplicant off

chkconfig xfs off

chkconfig ypbind off

chkconfig yum-updatesd off

新建killservice.sh文件,以上内容复制粘贴到文件里,运行sh killservice.sh

2.对TCP/IP网络参数进行调整


$ echo 'net.ipv4.tcp_syncookies = 1' >> /etc/sysctl.conf
$ sysctl -p

3.修改shell命令的history 记录个数


$ vim /etc/profile

HISTSIZE=100

4.定时校正服务器时间


$ yum install ntp

$ crontab -e

*/5 * * * * ntpdate ntp.api.bz

5.停止打印服务


$ /etc/rc.d/init.d/cups stop

$ chkconfig --list cups 确认是否关闭

6.停止ipv6


$ ifconfig -a

$ vim /etc/modprobe.conf

alias net -pf -10 off

alias ipv6 off

$ echo "IPV6INIT = no " >> /etc/sysconfig/network-scripts/ifconfig-eth0

$ shutdown -r now

7.调整linux 最大文件打开数


$ vim /etc/rc.local

ulimit -SHn 65535

8.关闭写磁盘I/0功能


$ vim /etc/fstab

/dev/sda5 /data/ ext3 noatime,nodiratime 0 0

9.优化内核TCP参数
$ vim /etc/sysctl.conf


net.ipv4.neigh.default.gc_stale_time = 120

net.ipv4.conf.all.rp_filter = 0

net.ipv4.conf.default.rp_filter = 0

net.ipv4.conf.default.arp_announce = 2

net.ipv4.conf.all.arp_announce = 2

net.ipv4.tcp_max_tw_buckets = 5000

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_max_syn_backlog = 20000

net.ipv4.tcp_synack_retries = 2

net.ipv4.conf.lo.arp_announce=2

net.ipv4.tcp_fin_timeout = 30

net.ipv4.tcp_keepalive_time = 1200

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.ip_local_port_range = 1024 65000

$ sysctl -p 查看

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