yum 、DHCP、DNS 服务脚本

================================================
yum仓库构建
================================================
#!bin/bash
# name:elin
# time:2019.08.24
# title:create yum

echo "挂载光盘..."
mount | grep -q "/dev/sr0" && umount /dev/sr0
mount /dev/sr0 /media/ &>/dev/null

echo "构建yum仓库..."
cd /etc/yum.r*
[ -d a ]  ||  mkdir a/
mv *.repo  a/
cat <<END > locale.repo
[cdrom]
name="cdrom"
baseurl=file:///media
enabled=1
gpgcheck=0
END

echo "清除yum缓存..."
yum clean all &>/dev/null  && yum makecache &>/dev/null
echo "yum仓库构建成功！！！"

=================================================
DHCP搭建
=================================================
#!bin/bash
# name: elin
# time: 2019.08.24
# title: create dhcp service
echo "安装dhcp安装包..."
yum -y install dhcp &>/dev/null
echo "修改配置文件..."
cat << EOF  > /etc/dhcp/dhcpd.conf
option domain-name "crushlinux.com";
option domain-name-servers 202.106.0.20;
default-lease-time 600;
max-lease-time 7200;
subnet 192.168.116.0 netmask 255.255.255.0 {
range 192.168.116.100  192.168.116.200;
  option routers 192.168.116.1;
}

EOF
echo "开启服务..."
systemctl start dhcpd
systemctl enable dhcpd
echo "dhcp服务已搭建完成..."

===================================================

DNS服务搭建
===================================================

#!bin/bash
# name：elin
# time: 2019.08.24
# title: create dns service

#关闭防火墙和安全机制
iptables -F
systemctl stop firewalld
setenforce 0

echo "检测安装包并安装bind bind-utils bind-libs"
rpm -qa | grep "bind"
yum -y install bind bind-utils bind-libs &>/dev/null
echo "安装成功"
#修改/etc/resolv.conf配置文件
cat << END> /etc/resolv.com
# Generated by NetworkManager
nameserver 202.106.0.20
nameserver 192.168.116.10
nameserver 192.168.116.20
END
echo "/etc/resolv.com配置成功"

# 修改/etc/hosts配置文件
cat << END > /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.116.10 ns1.study.com
192.168.116.20 ns2.study.com
END
echo "/etc/hosts配置成功"

#修改/etc/named.conf配置文件
cat << END > /etc/named.conf
options {
        directory "/var/nemed";
};
zone "study.com" IN {
        type master;
        file "elin.zheng";
        allow-transfer { 192.168.116.20; };
};
zone "116.168.192.in-addr.arpa" IN {
        type master;
        file "elin.fan";
        allow-transfer { 192.168.116.20; };
};
END
echo "/etc/named.conf配置成功"

#修改/var/named/elin.zheng配置文件
cat <<END > /var/named/elin.zheng
$TTL   86400  
@       IN      SOA     study.com.      admin.study.com. (
                20190824
                3H
                15M
                1W
                1D
)
                IN      NS      ns1.study.com.
                IN      NS      ns2.study.com.
                IN      MX 10   mail.study.com.
ns1             IN      A       192.168.116.10
ns2             IN      A       192.168.116.20
mail            IN      A       192.168.116.123
www             IN      A       192.168.116.124
END
echo "/var/named/elin.zheng配置成功"
#修改/var/named/elin.fan配置文件
cat <<END > /var/named/elin.fan
$TTL    86400  
@       IN      SOA     study.com.      admin.study.com. (
                20190824
                3H
                15M
                1W
                1D
)
                IN      NS      ns1.study.com.
                IN      NS      ns2.study.com.
                IN      MX 10   mail.study.com.
10              IN      PTR     ns1.study.com.
20              IN      PTR     ns2.study.com.
123             IN      PTR     mail.study.com.
124             IN      PTR     www.study.com.
END
echo "/var/named/elin.fan配置成功"
#给正反文件一些权限
chown :named /var/named/elin.*  &> /dev/null
#检测正向文件是否能被读取
cd /var/named/
named-checkzone study.com elin.zheng  &>/dev/null
#检测反向文件是否能被读取
named-checkzone 116.168.192.in-addr.arpa elin.fan &>/dev/null
#启动服务
systemctl start named
systemctl enable named
echo "DNS启动成功"