#!/bin/bash
#Script function: system init
#Write by:dreammengxi
#Mail:[email protected]
echo -e "\033[32m+--------------------------------------------------------------+\033[0m"
echo -e "\033[32m| Welcome to Centos System init |\033[0m"
echo -e "\033[32m+--------------------------------------------------------------+\033[0m"
#network configure
sed -i '/^ONBOOT/s/no/yes/' /etc/sysconfig/network-scripts/ifcfg-eth0
service network restart >/dev/null 2>&1
#update yum source
mv -f /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -s http://mirrors.163.com/.help/CentOS6-Base-163.repo -o /etc/yum.repos.d/CentOS-Base.repo
yum clean all
yum makecache
#install common software
yum -y install openssh-clients man wget yum-utils vim-enhanced lrzsz telnet traceroute glibc-headers gcc
yum -y install make autoconf libtool automake gcc-c++ openssl openssl-devel unzip zip
#set system time
yum -y install ntp crontabs
echo "* 3 * * * root /usr/sbin/ntpdate asia.pool.ntp.org > /dev/null 2>&1" >> /etc/crontab
service crond restart
#change permissions
chmod 600 /etc/passwd
chmod 600 /etc/shadow
chmod 600 /etc/group
chmod 600 /etc/gshadow
#ulimit
cat >> /etc/security/limits.conf << EOF
* soft nofile 65535
* hard nofile 65535
EOF
#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
#close ctrl+alt+del
sed -i "s/ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/#ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/" /etc/inittab
sed -i 's/^id:5:initdefault:/id:3:initdefault:/' /etc/inittab
#close ipv6
echo "alias net-pf-10 off" >> /etc/modprobe.conf
echo "alias ipv6 off" >> /etc/modprobe.conf
/sbin/chkconfig --level 35 ip6tables off
echo -e "\033[031m ipv6 is disabled.\033[0m"
#shutdown SELinux
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config
echo -e "\033[31m selinux is disabled,if you need,you must reboot.\033[0m"
sed -i "8 s/^/alias vi='vim'/" /root/.bashrc
echo 'syntax on' > /root/.vimrc
sed -i -e 's/^LANG=.*/LANG="en_US.UTF-8"/' /etc/sysconfig/i18n
echo 'stty erase ^H' >> /etc/profile
ssh_cf="/etc/ssh/sshd_config"
sed -i -e '74 s/^/#/' -i -e '76 s/^/#/' $ssh_cf
sed -i "s/#UseDNS yes/UseDNS no/" $ssh_cf
sed -i -e '44 s/^/#/' -i -e '48 s/^/#/' $ssh_cf
service sshd restart
for i in `chkconfig --list |grep 3:on |awk '{print $1}'`
do
CURSRV=`echo $i`
echo $CURSRV
case $CURSRV in
crond | irqbalance|atd | microcode_ctl | lvm2-monitor | network | random | sshd | syslog | local | rsyslog | haldaemon)
echo 'Base services, Skip!' >> /dev/null 2>&1
;;
*)
if [ $CURSRV == kdump ];then
echo -e "\033[31mchange $CURSRV to off.\033[0m"
chkconfig --level 2345 $CURSRV off
else
echo -e "\033[31mchange $CURSRV to off.\033[0m"
chkconfig --level 2345 $CURSRV off
service $CURSRV stop
fi
;;
esac
done