涉及内容：
1.DNS
2.网络yum源
3.epelԴ
4.同步时间
5.安装vim
6.设置最大打开文件描述符数
7.禁用selinux
8.关闭防火墙
9.优化ssh连接速度
10.内核参数优化
11.设置vim退格键删除最后一个字符类型
12.更新内核
脚本如下：
#!/bin/bash #author yundd by #this script is only for CentOS 7.x #check the OS platform=`uname -i` if [ $platform != "x86_64" ];then echo "this script is only for 64bit Operating System !" exit 1 fi echo "the platform is ok" cat << EOF your system is CentOS 7 x86_64 EOF #添加公网DNS地址 cat >> /etc/resolv.conf << EOF nameserver 114.114.114.114 EOF #Yum源更换为国内阿里源 yum install wget telnet -y mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo #添加阿里的epel源 #add the epel wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo # rpm -ivh http://dl.Fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-8.noarch.rpm #yum重新建立缓存 yum clean all yum makecache #同步时间 ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime yum -y install ntp /usr/sbin/ntpdate cn.pool.ntp.org echo "* 4 * * * /usr/sbin/ntpdate cn.pool.ntp.org > /dev/null 2>&1" >> /var/spool/cron/root systemctl restart crond.service #安装vim yum -y install vim ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #安装lrzsz实现win与linux之间的文件互相下载上传 yum -y install lrzsz #设置最大打开文件描述符数 echo "ulimit -SHn 102400" >> /etc/rc.local cat >> /etc/security/limits.conf << EOF * soft nofile 655350 * hard nofile 655350 EOF #禁用selinux sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config setenforce 0 #关闭防火墙 systemctl disable firewalld.service systemctl stop firewalld.service #set ssh sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config systemctl restart sshd.service #内核参数优化 cat >> /etc/sysctl.conf << EOF vm.overcommit_memory = 1 net.ipv4.ip_local_port_range = 1024 65536 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 1200 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_syncookies=1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_fin_timeout=120 net.ipv4.tcp_keepalive_time = 2400 net.ipv4.tcp_max_syn_backlog = 8192 net.ipv4.tcp_max_tw_buckets = 5000 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_abort_on_overflow = 0 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.netdev_max_backlog = 262144 net.core.somaxconn = 262144 net.ipv4.tcp_max_orphans = 3276800 net.ipv4.tcp_max_syn_backlog = 262144 net.core.wmem_default = 8388608 net.core.rmem_default = 8388608 net.ipv4.netfilter.ip_conntrack_max = 2097152 net.nf_conntrack_max = 655360 net.netfilter.nf_conntrack_tcp_timeout_established = 1200 EOF /sbin/sysctl -p #vim定义退格键可删除最后一个字符类型 echo 'alias vi=vim' >> /etc/profile echo 'stty erase ^H' >> /etc/profile cat >> /root/.vimrc << EOF set tabstop=4 set shiftwidth=4 set expandtab syntax on "set number EOF # update soft # yum -y update
来源：博客园
作者：duxiao
链接：https://www.cnblogs.com/yundd/p/11518030.html