#!/bin/bash ##### 新系统初始化 ##### #关闭selinux function close_selinux() { #临时关闭 setenforce 0 #永久关闭 sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config } #同步时间 function sync_time() { echo '正在执行时间同步......' yum -y install ntpdate #设置时区 timedatectl set-local-rtc 1 timedatectl set-timezone Asia/Shanghai #同步时间 ntpdate -u pool.ntp.org ntpd=(`which ntpdate`) #定时任务 echo "*/20 * * * * ${ntpd} pool.ntp.org > /dev/null 2>&1" >> /var/spool/cron/root systemctl reload crond echo "同步成功,当前时间:" `date` } #修改SSH端口 function change_port() { echo '正在修改SSH端口......' config_file="/etc/ssh/sshd_config" if grep -q "^Port" $config_file;then sed -i "/^Port/c Port 1993" $config_file else echo "Port 1993" >> $config_file fi systemctl restart sshd firewall-cmd --zone=public --add-port=1993/tcp --permanent firewall-cmd --reload echo 'SSH端口修改完毕......' } #安装BBR function insrall_bbr() { echo '正在安装BBR......' yum -y install wget wget https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm --import RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm #升级最新内核 yum --enablerepo=elrepo-kernel install kernel-lt -y #设置最新内核 grub2-set-default 0 #写入配置文件 echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf #清理工作 rm -rf RPM-GPG-KEY-elrepo.org bbr.sh echo 'BBR安装完毕,10s后重启...' #重启服务器 reboot } close_selinux sync_time change_port insrall_bbr sleep 20 echo 'test'