参考
CentOS7等Linux系统VM虚拟机运行ping时出现Name or service not known错误_linux_sw橘生淮南-华为开发者空间
https://huaweicloud.csdn.net/6707bbd9e2ce0119e0a20a5d.html?dp_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6NTEwMjY2LCJleHAiOjE3MzEwNTc4MzYsImlhdCI6MTczMDQ1MzAzNiwidXNlcm5hbWUiOiJibGluazE4MjAwNyJ9.R0y6mhofdD4_xNmnDsana7qG3bsYnwGwXpiylvRQn_k&spm=1001.2101.3001.6650.2&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7Ebaidujs_baidulandingword%7Eactivity-2-132259841-blog-129427155.235%5Ev43%5Epc_blog_bottom_relevance_base9&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7Ebaidujs_baidulandingword%7Eactivity-2-132259841-blog-129427155.235%5Ev43%5Epc_blog_bottom_relevance_base9&utm_relevant_index=4
)
