mirror of
https://github.com/dunwu/linux-tutorial.git
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153 lines
3.9 KiB
Bash
153 lines
3.9 KiB
Bash
#!/usr/bin/env bash
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###################################################################################
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# Linux Centos7 设置环境配置脚本（根据需要选择）
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# 注：不了解脚本中配置意图的情况下，不要贸然执行此脚本
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# Author: Zhang Peng
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###################################################################################
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# 获取当前机器 IP
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ip=""
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function getDeviceIp() {
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ip=`ifconfig eth0 | grep "inet addr" | awk '{ print $2}' | awk -F: '{print $2}'`
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if [ "$ip" == "" ]
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then
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ip=`ifconfig ens32 | grep "inet"|grep "broadcast" | awk '{ print $2}' | awk -F: '{print $1}'`
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fi
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if [ "$ip" == "" ]
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then
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ip=`echo $1`
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fi
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if [ "${ip}" == "" ]
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then
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echo "无法获取IP地址"
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exit 0
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fi
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}
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function setDNS() {
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getDeviceIp
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host=`hostname`
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cat >> /etc/hosts << EOF
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${ip} ${host}
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EOF
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}
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function setNameServer() {
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echo "添加域名服务器"
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echo "nameserver 218.2.135.1" >> /etc/resolv.conf
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}
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function setNtp() {
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# 时钟同步工具
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yum -y install ntp
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# 同步上海交通大学网络中心NTP服务器
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echo "* 4 * * * /usr/sbin/ntpdate ntp.sjtu.edu.cn > /dev/null 2>&1" >> /var/spool/cron/root
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# 以一个服务器时间为标准定时更新时间（有时需要以公司中的服务器作为标准）
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#echo "*/30 * * * * /usr/local/bin/ntpdate 192.168.16.182" >> /var/spool/cron/root
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}
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function setLimit() {
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cat >> /etc/security/limits.conf << EOF
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* - nofile 65535
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* - nproc 65535
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EOF
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}
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function setLang() {
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cat > /etc/sysconfig/i18n << EOF
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LANG="zh_CN.UTF-8"
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EOF
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}
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function closeShutdownShortkey() {
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echo "关闭 Ctrl+Alt+Del 快捷键防止重新启动"
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sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
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}
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function closeSelinux() {
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echo "关闭 selinux"
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# see http://blog.51cto.com/13570193/2093299
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sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
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}
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function closeFirewall() {
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echo "关闭防火墙"
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# see https://www.cnblogs.com/moxiaoan/p/5683743.html
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systemctl stop firewalld
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systemctl disable firewalld
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}
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function setBootMode() {
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# 1. 停机(记得不要把 initdefault 配置为 0，因为这样会使 Linux 不能启动)
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# 2. 单用户模式，就像 Win9X 下的安全模式
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# 3. 多用户，但是没有 NFS
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# 4. 完全多用户模式，准则的运行级
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# 5. 通常不用，在一些特殊情况下可以用它来做一些事情
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# 6. X11，即进到 X-Window 系统
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# 7. 重新启动 (记得不要把 initdefault 配置为 6，因为这样会使 Linux 不断地重新启动)
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echo "设置 Linux 启动模式"
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sed -i 's/id:5:initdefault:/id:3:initdefault:/' /etc/inittab
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}
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function configIpv4(){
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echo "配置 ipv4"
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cat >> /etc/sysctl.conf << EOF
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net.ipv4.tcp_tw_reuse = 1
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net.ipv4.tcp_tw_recycle = 1
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net.ipv4.tcp_fin_timeout = 2
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net.ipv4.tcp_syncookies = 1
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net.ipv4.tcp_keepalive_time = 1200
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net.ipv4.tcp_max_syn_backlog = 16384
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net.core.netdev_max_backlog = 16384
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net.core.somaxconn = 32768
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net.core.wmem_default = 8388608
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net.core.rmem_default = 8388608
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net.core.rmem_max = 16777216
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net.core.wmem_max = 16777216
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net.ipv4.tcp_timestamps = 0
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net.ipv4.route.gc_timeout = 100
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net.ipv4.tcp_synack_retries = 1
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net.ipv4.tcp_syn_retries = 1
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net.ipv4.tcp_mem = 94500000 915000000 927000000
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net.ipv4.tcp_max_orphans = 3276800
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net.ipv4.ip_local_port_range = 2000 65535
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net.ipv4.tcp_max_tw_buckets = 5000
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vm.swappiness=10
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EOF
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}
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function closeIpv6() {
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echo "关闭 ipv6"
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cat > /etc/modprobe.d/ipv6.conf << EOF
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alias net-pf-10 off
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options ipv6 disable=1
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EOF
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echo "NETWORKING_IPV6=off" >> /etc/sysconfig/network
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}
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######################################## MAIN ########################################
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echo -e "\n>>>>>>>>> 配置系统环境"
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# 关闭 selinux
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closeSelinux
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# 关闭防火墙
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closeFirewall
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# 设置 DNS 服务器和本机 Host
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setNameServer
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setDNS
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# 设置时间同步
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setNtp
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echo -e "\n>>>>>>>>> 配置系统环境结束"
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