centos初始化脚本

reko_3

　　#!/bin/bash
　　# BY zhidao
　　#welcome
　　cat << EOF
　　+--------------------------------------------------------------+
　　|         === Welcome to Centos System init ===                |
　　+--------------------------------------------------------------+
　　+--------------------------by zhidao---------------------------+
　　EOF
　　#set ntp
　　yum -y install 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
　　cat >> /etc/security/limits.conf << EOF
　　*           soft   nofile       65535
　　*           hard   nofile       65535
　　EOF
　　#set sysctl
　　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!!"
　　#close ctrl+alt+del
　　#sed -i "s/ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/#ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/" /etc/inittab
　　#set purview
　　chmod 600 /etc/passwd
　　chmod 600 /etc/shadow
　　chmod 600 /etc/group
　　chmod 600 /etc/gshadow
　　#disable ipv6
　　cat << EOF
　　+--------------------------------------------------------------+
　　|         === Welcome to Disable IPV6 ===                      |
　　+--------------------------------------------------------------+
　　EOF
　　echo "alias net-pf-10 off" >> /etc/modprobe.conf
　　echo "alias ipv6 off" >> /etc/modprobe.conf
　　/sbin/chkconfig --level 35 ip6tables off
　　echo "ipv6 is disabled!"
　　#disable selinux
　　sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config
　　echo "selinux is disabled,you must reboot!"
　　#disable iptables
　　/etc/init.d/iptables stop
　　/sbin/chkconfig iptables off
　　#vim
　　sed -i "8 s/^/alias vi='vim'/" /root/.bashrc
　　echo 'syntax on' > /root/.vimrc
　　#init_ssh
　　ssh_cf="/etc/ssh/sshd_config"
　　#sed -i -e '74 s/^/#/' -i -e '76 s/^/#/' $ssh_cf
　　#sed -i "s/#Port 22/Port 65535/" $ssh_cf
　　sed -i "s/#UseDNS yes/UseDNS no/" $ssh_cf
　　#client
　　#sed -i -e '44 s/^/#/' -i -e '48 s/^/#/' $ssh_cf
　　service sshd restart
　　#echo "ssh is init is ok.............."
　　#history security
sed -i "s/HISTSIZE=1000/HISTSIZE=10/" /etc/profilechattr +a /root/.bash_historychattr +i /root/.bash_history　　echo "service is init is ok.............."