#!/bin/bash
# Program:
#       system_init_shell
# History:
#       2012/04/1 25061008@qq.com
# Release:
#       1.1

cat << EOF
+--------------------------------------------------------------+
|          === Welcome to Centos 5.x System init ===           |
+--------------------------------------------------------------+
+---------------------------by opsren--------------------------+
EOF

#CHANGE yum
cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo.bak
wget http://mirrors.163.com/.help/CentOS-Base-163.repo
mv CentOS-Base-163.repo  CentOS-Base.repo
yum clean metadata  #清除以前的缓存
yum makecache  #重新建立缓存

#update gcc
yum -y install gcc gcc-c++ bison patch unzip mlocate flex lrzsz sysstat

#set ntp
/usr/sbin/ntpdate ntp.api.bz
echo "*/5 * * * * /usr/sbin/ntpdate ntp.api.bz > /dev/null 2>&1" >> /var/spool/cron/root
service crond restart

#set clock
hwclock --set --date="`date +%D\ %T`"
hwclock --hctosys

cat >> /etc/security/limits.conf << EOF
*           soft   nofile       102400
*           hard   nofile       102400
EOF

#close useless service

for i in `ls /etc/rc3.d/S*`
do
   CURSRV=`echo $i|cut -c 15-`
   echo $CURSRV
case $CURSRV in
   cpuspeed | crond | irqbalance | network | sshd | syslog | local )
   echo "Base services, Skip!"
   ;;
   *)
   echo "change $CURSRV to off"
   chkconfig --level 2345 $CURSRV off
   service $CURSRV stop
   ;;
esac
done
echo "service is init is ok.............."

#set LANG
:> /etc/sysconfig/i18n
cat >> /etc/sysconfig/i18n << EOF
LANG="en_US.UTF-8"
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

#close tty
sed -i "/tty[3-6]/ s/^/#/" /etc/inittab

#set purview
chmod 600 /etc/{passwd,shadow,group,gshadow}

#chattr /etc/{passwd,shadow}
#chattr +i /etc/{passwd,shadow,group,gshadow}

#lock system user
 passwd -l xfs
 passwd -l news
 passwd -l nscd
 passwd -l dbus
 passwd -l vcsa
 passwd -l games
 passwd -l haldaemon
 passwd -l gopher
 passwd -l ftp
 passwd -l mailnull
 passwd -l pcap
 passwd -l mail
 passwd -l shutdown
 passwd -l halt
 passwd -l uucp
 passwd -l operator
 passwd -l sync
 passwd -l adm
 passwd -l lp

#disable ipv6
echo "alias net-pf-10 off" >> /etc/modprobe.conf
echo "alias ipv6 off" >> /etc/modprobe.conf
/sbin/chkconfig ip6tables off
echo "ipv6 is disabled!"

#disable selinux
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config

#vim setting
sed -i "8 s/^/alias vi='vim'/" /root/.bashrc
echo 'syntax on' > /root/.vimrc

#init_ssh
ssh_cfg="/etc/ssh/sshd_config"
sed -i -e '74 s/^/#/' -i -e '76 s/^/#/' $ssh_cfg
#sed -i "s/#Port 22/Port 65535/" $ssh_cfg
sed -i -e 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/' -e 's/#UseDNS yes/UseDNS no/' $ssh_cfg
sed -i 's/#axAuthTries 6/axAuthTries 6/' $ssh_cfg

#client
sed -i -e '44 s/^/#/' -e '48 s/^/#/' $ssh_cfg
service sshd restart
echo "ssh is init is ok.............."

sed -i "s/HISTSIZE=1000/HISTSIZE=500/" /etc/profile
source /etc/profile

#history security
chattr +a /root/.bash_history
chattr +i /root/.bash_history

#tunoff disk I/0
mount -o noatime -o nodiratime -o remount /data
#mount -o noatime -o nodiratime -o remount /data1

cat << EOF
 +--------------------------------------------------------------+
 |                    ===System init over===                    |
 +--------------------------------------------------------------+
 +---------------------------by 邱治军--------------------------+
EOF
echo "###############################################################"