LINUX 系统初始化脚本

#!/bin/bash

######the system first start configuretion #####for install 

####copy right by donglei##############

#1、配置sysctl

mv /etc/sysctl.conf  /etc/sysctl.bak

echo "############################the new config for sysctl ###########

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

kern.maxfiles = 65536

kern.maxfilesperproc = 32768

net.core.rmem_default = 262144

net.core.wmem_default = 262144

net.core.rmem_max = 262144

net.core.wmem_max = 262144

net.inet.udp.checksum = 1

net.inet.tcp.syncookies = 1

net.ipv4.tcp_synack_retries = 2

net.ipv4.tcp_syn_retries = 2

net.ipv4.tcp_keepalive_time = 30

net.ipv4.tcp_keepalive_probes = 2

net.ipv4.tcp_keepalive_intvl = 2

net.ipv4.tcp_fin_timeout = 30

net.ipv4.tcp_tw_reuse = 1 

kernel.sem = 250 32000 100 128

fs.file-max = 65536

net.ipv4.ip_local_port_range = 1024 65000" >> /etc/sysctl.conf

chmod 644 /etc/sysctl.conf

#2、配置ipv6

echo "##########ipv6-disabled########### 

alias net-pf-10 off

alias ipv6 off" >> /etc/modprobe.d/dist.conf

echo "##############ipv6-disabled#########

NETWORKING_IPV6=no" >> /etc/sysconfig/network

/sbin/chkconfig ip6tables off

#3、配置系统时钟

echo "##############system_clock###########

01 * * * * root ntpdate 172.17.1.150; hwclock --systohc" >>/etc/crontab

#4、配置bash环境,每次命令行显示当前位置和时间，当前仅仅针对root设置

echo "export  PS1='\033[1;33m\H \033[1;34m[\w] \033[1;35m\D{%D %T}\n\[\033[1;36m\]\u@pts/\l \[\033[00m\]\$ '" >> /root/.bashrc 

#5、配置系统服务启动项

for i in `ls /etc/rc3.d/S*`

do

servi=`echo $i|cut -c 15-`

case $servi in

cpuspeed | crond | irqbalance | microcode_ctl | sendmail)

;;

*)

echo "change $servi to off" >>./log.log

chkconfig $servi off

service $servi stop

;;

esac

done

#6、配置系统默认语言环境

mv /etc/sysconfig/i18n  /etc/sysconfig/i18n.bak

echo "#########set new language by admin#######

LANG="zh_CN.UTF-8"

SUPPORTED="zh_CN.UTF-8:zh_CN:zh:en_US.UTF-8:en_US:en"

SYSFONT="latarcyrheb-sun16" " >/etc/sysconfig/i18n

chmod 644 /etc/sysconfig/i18n

#7、配置selinux

sed -i -e 's/^SELINUX=.*/LANG="SELINUX=disabled/' -e 's/^SELINUXTYPE=.*/SELINUXTYPE=disabled/' /etc/sysconfig/selinux

#8、关闭iptables

service iptables stop 

chkconfig iptables off

#9、配置root用户不能直接登录系统

mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bak

grep -Ev '^$|^#' /etc/ssh/sshd_config.bak >/etc/ssh/sshd_config

chmod 600 /etc/ssh/sshd_config

sed /PermitRootLogin/d /etc/ssh/sshd_config 

sed /ClientAliveCountMax/d /etc/ssh/sshd_config 

echo "######ssh security config#######

PermitRootLogin no

ClientAliveCountMax 10 " >>/etc/ssh/sshd_config

service sshd restart