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#!/bin/bash #written by mofansheng@2015-11-03 #system optimization script #The fllow apply to CentOS 6.x . /etc/init.d/functions function check_ok(){ if [ $? -eq 0 ] then echo "" continue else echo "pls check error" exit fi } cat<<EOF ----------------------------------------------------------------------- | system optimization | ----------------------------------------------------------------------- EOF #1. 更新系统 yum update -y yum install net-tools wget telnet perl perl-devel kernel-devel bash-completion ntpdate vim #yum install gcc cmake bzip2-devel curl-devel db4-devel libjpeg-devel libpng-devel freetype-devel libXpm-devel gmp-devel libc-client-devel openldap-devel unixODBC-devel postgresql-devel sqlite-devel aspell-devel net-snmp-devel libxslt-devel libxml2-devel pcre-devel pspell-devel libmemcached libmemcached-devel zlib-devel vim wget lrzsz tree yum groupinstall "Development tools" -y #2. 给/etc/rc.local添加执行权限 chmod +x /etc/rc.d/rc.local #3. 关闭不必要服务close unimportant system services echo "===Close unimportant system services,it will take serval mintinues===" for i in `systemctl list-unit-files |grep 'enabled'| awk '{print $1}' |grep -Ev "crond|sshd|sysstat|rsyslog|network|dbus|systemd|multi|default|NetworkManager|auditd"`; do systemctl disable $i;systemctl stop $i;systemctl status $i done check_ok action "Close unimportant system services" /bin/true #4. close selinux echo "===close SELINUX===" if [ `getenforce` != "Disabled" ] then sed -i '/^SELINUX/s/enforcing/disabled/g' /etc/selinux/config setenforce 0 echo "selinux is disabled" else action "SELINUX is closed" /bin/true fi check_ok action "Close SELINUX" /bin/true #5. 关闭防火墙安装iptables systemctl stop firewalld.service systemctl disable firewalld.service yum install iptables-services -y #6. 修改主机名 hostnamectl set-hostname vm1 #7. 设置字符集 yum -y install kde-l10n-Chinese localectl set-locale LANG=zh_CN.utf8 echo "LANG=zh_CN.UTF-8" > /etc/environment echo "LC_ALL=zh_CN.UTF-8" >> /etc/environment echo "LANG=zh_CN.utf8" > /etc/locale.conf source /etc/locale.conf #8. 加大打开文件数的限制（open files）和内核优化 echo "* soft nofile 65535" >> /etc/security/limits.conf echo "* hard nofile 65535" >> /etc/security/limits.conf echo "* soft nproc 65535" >> /etc/security/limits.conf echo "* hard nproc 65535" >> /etc/security/limits.conf cat >> /etc/sysctl.conf << "EOF" #CTCDN系统优化参数 fs.file-max = 655536 #关闭ipv6 net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 #决定检查过期多久邻居条目 net.ipv4.neigh.default.gc_stale_time=120 #使用arp_announce / arp_ignore解决ARP映射问题 net.ipv4.conf.default.arp_announce = 2 net.ipv4.conf.all.arp_announce=2 net.ipv4.conf.lo.arp_announce=2 # 避免放大攻击 net.ipv4.icmp_echo_ignore_broadcasts = 1 # 开启恶意icmp错误消息保护 net.ipv4.icmp_ignore_bogus_error_responses = 1 #关闭路由转发 net.ipv4.ip_forward = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.default.send_redirects = 0 #开启反向路径过滤 net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 #处理无源路由的包 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.default.accept_source_route = 0 #关闭sysrq功能 kernel.sysrq = 0 #core文件名中添加pid作为扩展名 kernel.core_uses_pid = 1 # 开启SYN洪水攻击保护 net.ipv4.tcp_syncookies = 1 #修改消息队列长度 kernel.msgmnb = 65536 kernel.msgmax = 65536 #设置最大内存共享段大小bytes kernel.shmmax = 68719476736 kernel.shmall = 4294967296 #timewait的数量，默认180000 net.ipv4.tcp_max_tw_buckets = 6000 net.ipv4.tcp_sack = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_rmem = 4096 87380 4194304 net.ipv4.tcp_wmem = 4096 16384 4194304 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 #每个网络接口接收数据包的速率比内核处理这些包的速率快时，允许送到队列的数据包的最大数目 net.core.netdev_max_backlog = 262144 #限制仅仅是为了防止简单的DoS 攻击 net.ipv4.tcp_max_orphans = 3276800 #未收到客户端确认信息的连接请求的最大值 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 #内核放弃建立连接之前发送SYNACK 包的数量 net.ipv4.tcp_synack_retries = 1 #内核放弃建立连接之前发送SYN 包的数量 net.ipv4.tcp_syn_retries = 1 #启用timewait 快速回收 net.ipv4.tcp_tw_recycle = 1 #开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 #当keepalive 起用的时候，TCP 发送keepalive 消息的频度。缺省是2 小时 net.ipv4.tcp_keepalive_time = 1800 net.ipv4.tcp_keepalive_probes = 3 net.ipv4.tcp_keepalive_intvl = 15 #允许系统打开的端口范围 net.ipv4.ip_local_port_range = 1024 65000 #修改防火墙表大小，默认65536 net.netfilter.nf_conntrack_max=655350 net.netfilter.nf_conntrack_tcp_timeout_established=1200 # 确保无人能修改路由表 net.ipv4.conf.all.accept_redirects = 0 net.ipv4.conf.default.accept_redirects = 0 net.ipv4.conf.all.secure_redirects = 0 net.ipv4.conf.default.secure_redirects = 0 EOF #生效 sysctl -p #用户进程限制 sed -i 's#4096#65535#g' /etc/security/limits.d/20-nproc.conf #加大普通用户限制 也可以改为unlimited #set SSH sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config sed -i 's/#Port 22/Port 65500/g' /etc/ssh/sshd_config service sshd restart #set system files permission chmod 600 /etc/passwd chmod 600 /etc/group chmod 600 /etc/shadow chmod 600 /etc/gshadow #set ntp yum install ntpdate -y ntpdate ntp.fudan.edu.cn echo "* 3 * * * /usr/sbin/ntpdate ntp.fudan.edu.cn >/dev/null 2>&1" >>/etc/crontab service crond restart check_ok action "ntpdate is installed and add in crontab" /bin/true #set vim echo "===install vim,it will take serval mintinues===" yum install vim-enhanced -y &>/dev/null alias vi=vim echo "alias vi=vim" >>/root/.bashrc check_ok action "vim is installed" /bin/true #set yum repos echo "===update yum repos,it will take serval mintinues===" mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo yum clean all &>/dev/null yum makecache &>/dev/null check_ok action "yum repos update is ok" /bin/true |
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