手动指定容器要使用的DNS

[root@localhost ~]# docker run -it --name t1 --network bridge --hostname zxr --dns 114.114.114.114 --rm busybox
/ # cat /etc/resolv.conf 
nameserver 114.114.114.114
/ # nslookup 114.114.114.114
Server:         114.114.114.114
Address:        114.114.114.114:53

Non-authoritative answer:
114.114.114.114.in-addr.arpa    name = public1.114dns.com

/ # nslookup www.baidu.com
Server:         114.114.114.114
Address:        114.114.114.114:53

Non-authoritative answer:
www.baidu.com   canonical name = www.a.shifen.com
Name:   www.a.shifen.com
Address: 14.215.177.38
Name:   www.a.shifen.com
Address: 14.215.177.39

手动往/etc/hosts文件写入主机名到IP地址的映射

[root@localhost ~]# docker run -it --name t1 --network bridge --hostname zxr --add-host www.zxr.com:1.1.1.1 --rm busybox
/ # cat /etc/hosts
127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
1.1.1.1 www.zxr.com
172.17.0.2      zxr