Centos使用host、nslookup能正常解析域名，但ping www.baidu.com报：ping: www.baidu.com: Name or service not known

Question

问题遇到的现象和发生背景

OS版本：CentOS Linux release 7.6.1810 (Core) 

问题相关代码，请勿粘贴截图

使用curl和wget验证也解析失败

 [root@localhost ~]# curl https://www.cnblogs.com/passer101/p/9899202.html
curl: (6) Could not resolve host: www.cnblogs.com; Name or service not known

[root@localhost ~]# wget https://www.cnblogs.com/passer101/p/9899202.html
--2021-12-22 18:20:25--  https://www.cnblogs.com/passer101/p/9899202.html
Resolving www.cnblogs.com (www.cnblogs.com)... failed: Name or service not known.
wget: unable to resolve host address ‘www.cnblogs.com’

运行结果及报错内容

ping: www.baidu.comm: Name or service not known

我的解答思路和尝试过的方法

尝试关闭NetworkManage,问题依旧
尝试安装bind，问题依旧

网卡配置：

[root@localhost ~]# more /etc/sysconfig/network-scripts/ifcfg-ens32 
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens32
UUID=65fb1b6d-055e-4826-a1e4-1c2feb6c60ad
DEVICE=ens32
ONBOOT=yes
IPADDR=xxxxxxxxxxxxxx
PREFIX=24
GATEWAY=xxxxxxxxxxx
ARPCHECK=no
DNS1=211.139.80.6
DNS2=218.203.160.194

resolv配置：

[root@localhost ~]# more /etc/resolv.conf
# Generated by NetworkManager
nameserver 211.139.80.6
nameserver 218.203.160.194

host解析：

[root@localhost log]# host www.baidu.com
www.baidu.com is an alias for www.a.shifen.com.
www.a.shifen.com has address 39.156.66.18
www.a.shifen.com has address 39.156.66.14

nslookup解析：

[root@localhost log]# nslookup www.baidu.com
Server:         218.203.160.194
Address:        218.203.160.194#53




Non-authoritative answer:
www.baidu.com   canonical name = www.a.shifen.com.
Name:   www.a.shifen.com
Address: 39.156.66.18
Name:   www.a.shifen.com
Address: 39.156.66.14

我想要达到的结果

能够正常解析域名

Answer 1

问题解决了， 把 /etc/nsswitch.conf文件中的“hosts: files”修改为“hosts: files dns myhostname”后，ping测试正常

[root@localhost ~]# ping www.baidu.com
PING www.a.shifen.com (39.156.66.14) 56(84) bytes of data.
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=1 ttl=52 time=27.8 ms
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=2 ttl=52 time=27.9 ms
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=3 ttl=52 time=27.7 ms
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=4 ttl=52 time=27.7 ms