利用dns来ping通所有主机名的方法，免去一条条配置hosts

原理

1.设置一批主机的主机名为***.host.com

2.内外搭建一个dns服务，主域设置为host.com,把主机名对应的IP列表都配置好

3.dns服务器配置forwarder转发功能需要在named.conf，可以把不知道的域名转到公网，或dns2设置为公网的dns

4.各服务器把dns指向的自搭的dns服务器

5.各服务器在/etc/resolv.conf中首行增加search host.com

步骤

安装软件包：

yum  -y  install  bind  bind-chroot

修改配置文件

vim /etc/named.conf

13         listen-on port 53 { 192.168.154.11; };    # 监听本机IP
14         listen-on-v6 port 53 { ::1; };       # 删除，不监听IPV6
20         allow-query     { any; };            # 允许所有主机查看
21         forwarders      { 192.168.154.2; };      # 办公网上一级的DNS,（生产写运营商dns）
33         recursion yes;               # dns采用递归的查询
35         dnssec-enable no;                # 关闭，节省资源（生产可能不需要关闭）
36         dnssec-validation no;            # 关闭，节省资源，不做互联网认证

配置文件全部如下

options {listen-on port 53 { 192.168.6.129; };listen-on-v6 port 53 { ::1; };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; };forwarders { 114.114.114.114; };recursion yes;dnssec-enable yes;//dnssec-validation yes;/* 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";
};logging {channel default_debug {file "data/named.run";severity dynamic;};
};
zone "host.com" {type master;file "host.com.zone";
};
zone "." IN {type hint;file "named.ca";
};include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

vim /var/named/host.com.zone
后续新增或减少主机在dns服务器修改该配置文件即可，其他主机不用操作

$TTL 1D
@       IN SOA  @ rname.invalid. (0       ; serial1D      ; refresh1H      ; retry1W      ; expire3H )    ; minimum
@       NS  dns.host.com.
dns    A   192.168.6.129
vm129    A   192.168.6.129
vm128    A   192.168.6.128

设置配置文件权限并检查配置文件是否正确

chmod  644  /etc/named.conf
chmod  644  /var/named/host.com.zone
named-checkconf

启动服务

systemctl restart named

修改/etc/resolv.conf

search host.com
nameserver 192.168.6.129
nameserver 114.114.114.114

效果

[root@vm129 ~]# ping vm128
PING vm128.host.com (192.168.6.128) 56(84) bytes of data.
64 bytes from 192.168.6.128 (192.168.6.128): icmp_seq=1 ttl=64 time=0.204 ms
64 bytes from 192.168.6.128 (192.168.6.128): icmp_seq=2 ttl=64 time=0.223 ms