Centos7配置静态ip，搭建bind9 DNS服务

配置静态ip和网关

1. 使用 ip addr 查看主机ip
   
   可以看到目前是没有ip地址的

2. 修改 /etc/hostname 文件
   vi /etc/hostname
   

3. 修改 /etc/sysconfig/network文件

   NETWORKING=yes
   HOSTNAME=lnh-11.host.com
   GATEWAY=192.168.137.2
   
   具体网关地址GATEWAY，查看
   
   点击 "虚拟网络编辑器" 找到Vmnet8

   
   点击上图中 “NAT设置”按钮，就可以找到具体的网关是多少了
   

4. 修改该配置文件 /etc/sysconfig/network-scripts/ifcfg-ens33

   原有配置
   
   改为以下配置

   TYPE=Ethernet
   PROXY_METHOD=none
   BROWSER_ONLY=no
   BOOTPROTO=static # 修改上图中的dhcp为static
   DEFROUTE=yes
   IPADDR=192.168.137.66 # 新增配置 本机ip
   NETMASK=255.255.255.0
   DNS1=114.114.114.114  # DNS解析  
   IPV4_FAILURE_FATAL=no
   IPV6INIT=yes
   IPV6_AUTOCONF=yes
   IPV6_DEFROUTE=yes
   IPV6_FAILURE_FATAL=no
   IPV6_ADDR_GEN_MODE=stable-privacy
   NAME=ens33
   UUID=fba41fb8-b0c2-4809-9431-0d92a0fd21d6
   DEVICE=ens33
   ONBOOT=yes   # 将值改为yes
   

5. 重启
   reboot
   重启之后，查看 ip addr ，已经修改成功
   
   ping baidu.com ok！
   

搭建bind9 DNS服务

1. 初始化操作系统配置

   # 关闭防火墙
   systemctl disable firewalld.service # 永久关闭
   systemctl stop firewalld.service # 临时关闭
   
   # 关闭selinux
   sed -i 's/enforcing/disabled/' /etc/selinux/config #永久关闭
   setenforce 0 #临时关闭
   
   # 关闭swap
   sed -ri 's/.*swap.*/#&/' /etc/fstab # 永久关闭
   swapoff -a # 临时关闭
   
   # 时间同步
   yum install ntpdate -y
   ntpdate time.windows.com
   

2. 安装必要的软件

   yum install -y wget net-tools telnet tree nmap sysstat lrzsz dos2unix bind-utils vim less epel-release
   

3. 安装bind

   yum install -y bind
   

4. 编辑主配置文件 /etc/named.conf

   options {
           listen-on port 53 { 192.168.137.66; };  ## 修改为本机ip
           listen-on-v6 port 53 { ::1; };
           forwarders      { 192.168.137.2; }; ## 网关
           directory       "/var/named";
           dump-file       "/var/named/data/cache_dump.db";
           statistics-file "/var/named/data/named_stats.txt";
           memstatistics-file "/var/named/data/named_mem_stats.txt";
           recursing-file  "/var/named/data/named.recursing";
           secroots-file   "/var/named/data/named.secroots";
           allow-query     { any; }; ## 修改为any，允许任何访问
   
           /*
            - If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.
            - If you are building a RECURSIVE (caching) DNS server, you need to enable
              recursion.
            - If your recursive DNS server has a public IP address, you MUST enable access
              control to limit queries to your legitimate users. Failing to do so will
              cause your server to become part of large scale DNS amplification
              attacks. Implementing BCP38 within your network would greatly
              reduce such attack surface
           */
           recursion yes;
   
           dnssec-enable no; # 修改为no
           dnssec-validation no; # 修改为 no
   
           /* Path to ISC DLV key */
           bindkeys-file "/etc/named.root.key";
   
           managed-keys-directory "/var/named/dynamic";
   
           pid-file "/run/named/named.pid";
           session-keyfile "/run/named/session.key";
   };
   
   

5. 编辑区域配置文件 /etc/named.rfc1912.zones

   增加配置

   ## 为后缀 lnh-66.host.com
   zone "host.com" IN {
           type  master;
           file  "host.com.zone";
           allow-update { 192.168.137.66; }; # 主机ip
   };
   

6. 配置主机域文件 /var/named/host.com.zone

   $ORIGIN host.com.
   $TTL 600    ; 10 minutes
   @       IN SOA  dns.host.com. dnsadmin.host.com. (
                   2021062401 ; serial
                   10800      ; refresh (3 hours)
                   900        ; retry (15 minutes)
                   604800     ; expire (1 week)
                   86400      ; minimum (1 day)
                   )
               NS   dns.host.com.
   $TTL 60 ; 1 minute
   dns              A    192.168.137.66
   lnh-66           A    192.168.137.66
   
   

7. 检查配置是否有错误
   ~]# named-checkconf

8. 修改主机的dns服务器地址 /etc/sysconfig/network-scripts/ifcfg-ens33

   

9. 重启网络

   systemctl restart network
   

10. 查看 /etc/resolv.conf

    

11. 启动 bind9

    systemctl start named
    systemctl enable named
    

    ping 百度和内网 ok
    

12. 解析，查看dns指向

    dig -t A lnh-66.host.com @192.168.137.66 +short
    

    
    

13. 找到宿主机如下配置
    
    修改DNS服务器，为192.168.137.66（安装bind的服务器地址）

    在宿主机通过虚拟机主机名ping ，ok