如何验证域名解析状态?

首先可以ping下域名，查看域名是否解析到IP地址；如下

➜  ~ ping aws.baby
PING aws.baby (185.199.111.153): 56 data bytes
64 bytes from 185.199.111.153: icmp_seq=0 ttl=51 time=80.452 ms
64 bytes from 185.199.111.153: icmp_seq=1 ttl=51 time=92.030 ms

也可以使用nslookup验证

➜  ~ nslookup aws.baby
Server:        202.106.0.20
Address:    202.106.0.20#53

Non-authoritative answer:
Name:    aws.baby
Address: 185.199.109.153
Name:    aws.baby
Address: 185.199.108.153
Name:    aws.baby
Address: 185.199.111.153
Name:    aws.baby
Address: 185.199.110.153

如果没有安装可以使用下面命令来安装

Windows Mac 貌似自带，可以使用nslookup验证下

yum install bind-utils  #CentOS
apt-get install dnsutls #Ubuntu

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