系统初始化脚本 用于新安装系统的首次调试

以下脚本 ，适用于刚刚安装的新Linux系统的第一次优化和调试 包括关闭ipv6、关闭防火墙、关闭selinux、优化内核等等   使用后需要重启  自动重启

 

#!/bin/bash #Created by weihaoxuan cat << EOF +------------------------------------------------+ |    = = welcome to cenros system init ==        | +------------------------------------------------+ EOF #set ntp yum install -y ntp echo "* 3 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1 " >> /etc/crontab service crond restart #set ulimit echo "ulimit -SHn 102400" >> /etc/rc.local true > /etc/sysctl.conf cat >> /etc/sysctl.conf << EOF net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 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 net.core.netdev_max_backlog = 262144 net.core.somaxconn = 262144 net.ipv4.tcp_max_orphans = 3276800 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 net.ipv4.tcp_keepalive_time = 1200 net.ipv4.ip_local_port_range = 1024 65535 EOF /sbin/sysctl -p echo "sysctl set ok!!" #set purview chmod 600 /etc/passwd chmod 600 /etc/shadow chmod 600 /etc/group chmod 600 /etc/gshadow #disable ipv6 echo "alias net -pf -10 off" >> /etc/modprobe.conf echo "alias ipv6 off" >> /etc/modprobe.conf /sbin/chkconfig --level 35 ip6tables off echo "ipv6 disables!!" #disable selinux sed -i '/SELINUX/s/ecforcing/disabled/' /etc/selinux/config echo "setenforce 0" >> /etc/rc.local reboot