docker环境：cURL error 6: Could not resolve host

docker访问外网提示："cURL error 6: Could not resolve host:gateway.xx.com"

1、获取域名ip地址，如123.12.12.12
ping gateway.xx.com

进入容器，编辑
vi /etc/resolv.conf

新增nameserver
nameserver 123.12.12.12