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                ~~~ #!/bin/bash #1,關閉selinux sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config grep SELINUX=disabled /etc/selinux/config setenforce 0 getenforce #2,關閉iptables /etc/init.d/iptables stop /etc/init.d/iptables stop chkconfig iptables off #3,精簡開機自啟動服務 chkconfig | egrep -v "crond|sshd|network|rsyslog|sysstat"|awk '{print "chkconfig",$1,"off"}'|bash export LANG=en chkconfig --list | grep 3:on #4,提權oldboy可以sudo useradd oldboy echo "123456"|passwd --stdin oldboy \cp /etc/sudoers /etc/sudoers.bak echo "oldboy ALL=(ALL) NOPASSWD:ALL" >>/etc/sudoers tail -1 /etc/sudoers visudo -c #5,中文字符集 cp /etc/sysconfig/i18n /etc/sysconfig/i18n.ori #echo 'LANG="zh_CN.UTF-8"' >/etc/sysconfig/i18n echo 'LANG="en_US.UTF-8"' >/etc/sysconfig/i18n source /etc/sysconfig/i18n echo $LANG #6,時間同步 echo '#time sync by oldboy at 2017-11-26' >> /var/spool/cron/root echo '*/5 * * * * /usr/sbin/ntpupdate ntp1.aliyun.com '>/dev/null 2>&1 >>/var/spool/cron/root crontab -l #7,命令行安全 #echo 'export TMOUT=300' >>/etc/profile #echo 'export HISTSIZE=5' >>/etc/profile #echo 'export HISTFILESIZE=5' >>/etc/profile #tail -3 /etc/profile #. /etc/profile #8,加大文件描述 echo '* - nofile 65535' >>/etc/security/limits.conf tail -1 /etc/security/limits.conf #9,內核優化 cat >>/etc/sysctl.conf<<EOF net.ipv4.tcp_fin_timeout = 2 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_keepalive_time = 600 net.ipv4.ip_local_port_range = 4000 65000 net.ipv4.tcp_max_syn_backlog = 16384 net.ipv4.tcp_max_tw_buckets = 36000 net.ipv4.route.gc_timeout = 100 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_synack_retries = 1 net.core.somaxconn = 16384 net.core.netdev_max_backlog = 16384 net.ipv4.tcp_max_orphans = 16384 #以下參數是對iptables防火墻的優化,防火墻不開會提示,可以忽略不理。 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 EOF #10,使用阿里云yum源 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.bak mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.bak wget -O /etc/yum.repos.d/epel.repo http://mirrors.alyun.com/repo/epel-6-repo #11,命令行智能補全,自動提示 yum install bash-completion -y #12,修改提示符路徑提示為全路徑 sed -i -r 's#(.*PS1=\"\[\\u\@\\h \\)W(\]\\\\\$ \")#\1\w\2#g' /etc/bashrc ~~~ ~~~ #小結:如何優化linux: # #1、關閉SElinux #2、關閉防火墻,設定運行級別為3. #3、精簡開機自啟動服務 #4、SSH安全控制(提前建立普通用戶) #5、sudo 管理用戶授權 #6、調整文件描述符 #7、更改合適的字符集 #8、鎖定關鍵系統文件 #9、禁止顯示內核版本及系統版本信息 #10、設置會話的超時時間及歷史記錄數 #11、禁止PING #12、優化LINUX內核參數 #13、特定漏洞yum/rpm升級 #14、清除多余的系統虛擬賬號 #15、服務器時間同步 #16、打補丁下載軟件調整為國內的下載地址(調整yum源) #17、定時清理郵件服務臨時目錄垃圾文件 #18、為grub菜單加密碼 ~~~
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