51工具盒子在日常工作维护时收到客户反馈服务器无法访问网站的问题，经过初期测试发现nslookup命令能够解析DNS地址，但其他命令无法识别resolve配置。
[root@281 ~]# curl www.qq.com
curl: (6) Couldn't resolve host 'www.qq.com'
[root@281 ~]# wget www.qq.com
--2022-11-09 13:39:57-- http://www.qq.com/
Resolving www.qq.com... failed: Name or service not known.
wget: unable to resolve host address `www.qq.com'
[root@281 ~]# nslookup www.qq.com 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
`Non-authoritative answer:
www.qq.com canonical name = ins-r23tsuuf.ias.tencent-cloud.net.
Name: ins-r23tsuuf.ias.tencent-cloud.net
Address: 42.81.176.157
Name: ins-r23tsuuf.ias.tencent-cloud.net
Address: 42.81.179.153`
解决办法
如果在网卡配置中未配置DNS信息，则需手动配置DNS信息。
通过排查，是由于NetworkManager服务未启动导致的问题，启动服务后恢复正常。
[root@281 ~]# service NetworkManager status
NetworkManager is stopped
[root@281 ~]# service NetworkManager start
Setting network parameters... [ OK ]
Starting NetworkManager daemon: [ OK ]
