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#! /bin/bash
#
#
#初始化Centos系统
#
#
#
function echo_success()
{
	echo -e "\e[32m$1\e[0m"
}
function echo_failure()
{
	echo -e "\e[31m$1\e[0m"
}
function echo_warning()
{
	echo -e "\e[33m$1\e[0m"
}
export LANG=en_US.utf8
#
#检查系统服务关闭不必要的服务
#
echo_success "System Initialization..."
function check_service()
{
	LEVEL=35
	SERVER_ARR=('crond' 'messagebus' 'network' 'sshd' {'','r'}'syslog')
	SERVER_STATUS=0
	for I  in $(chkconfig --list|awk '{print $1}'|egrep -v '^.*:'|sort|uniq)
	do
		for X in ${SERVER_ARR[@]}
		do
			if [ "x$I" == "x$X" ];then
				for S in $(chkconfig --list $I|awk '{print $5;print $7;}')
				do
					if [ "${S##*:}" != "on" ];then
						LEVEL_TMP=${S%%:*}
						chkconfig --level $LEVEL_TMP $I on
					fi
				done
				SERVER_STATUS=1
			fi
		done
		if [ $SERVER_STATUS -eq 0 ];then
			service $I stop &>/dev/zero 
			chkconfig --level $LEVEL $I off
		else
			SERVER_STATUS=0
		fi
	done
}
#
#关闭其他杂项
#
function  check_other()
{
	SELINUX_CONF_FILE=/etc/selinux/config
	SELINUX_STATUS=$(grep "^SELINUX=" $SELINUX_CONF_FILE)
	INITABE_CONF_FILE=/etc/inittab
	TTY_CONF_FILE=/etc/init/start-ttys.conf
	INIT_CONF_FILE=/etc/sysconfig/init
    LIMIT_CONF_FILE=/etc/security/limits.conf
	INITCTL=/sbin/initctl
	SYSTEM_TYPE=0
	RUN_LEVEL=3
	TTY_NUMBER=2

	if [ -f $TTY_CONF_FILE ];then
		SYSTEM_TYPE=6
	else
		SYSTEM_TYPE=5
	fi
	if [ "x${SELINUX_STATUS##*=}" != "xdisabled" ];then
		sed  -i "s/$SELINUX_STATUS/SELINUX=disabled/" $SELINUX_CONF_FILE
		/usr/sbin/setenforce 0
	fi
	NOW_RUN_LEVEL=$(grep ^id:[0-6]:* /etc/inittab)
	if [ "x${NOW_RUN_LEVEL:3:1}" != "x3" ];then
			sed -i "s/$NOW_RUN_LEVEL/${NOW_RUN_LEVEL//[0-9]/$RUN_LEVEL}/" $INITABE_CONF_FILE
	fi
	if [ ${SYSTEM_TYPE} -eq 6  ];then
		NOW_TTY_NUM=$(grep "^.*ACTIVE_CONSOLES.*]$" $INIT_CONF_FILE)
		NOW_TTY_TMP_NUM=${NOW_TTY_NUM:$(expr ${#NOW_TTY_NUM} - 2):1} 
		if [ $NOW_TTY_TMP_NUM -gt 2 ];then
			NOW_TMP_TTY=${NOW_TTY_NUM:$(expr ${#NOW_TTY_NUM} - 4):3}
			sed -i "s/\[$NOW_TMP_TTY\]/\[1-2]/" $INIT_CONF_FILE
			for TTY_P in $(ps auxw|grep tty[$(expr $TTY_NUMBER + 1)-$NOW_TTY_TMP_NUM]|grep -v grep|awk '{print $NF}')
			do
				$INITCTL stop tty TTY=$TTY_P  &>/dev/zero 
			done
		fi
	elif [ ${SYSTEM_TYPE} -eq 5 ];then
		sed -i  's/^[3-9]/#&/' $INITABE_CONF_FILE
        init q
	else
		echo "init system is Centos 6.x or Centos5.x"
	fi

    if [ -f $LIMIT_CONF_FILE ];then
        sed  -i 's/^*.[sh]/#*/'  $LIMIT_CONF_FILE
        cat <<EOF >> $LIMIT_CONF_FILE
* soft nofile 60000 
* hard nofile 65535
EOF
    fi
}
check_service
check_other
echo_success "System initialization is complete"