Linux Local parsing file/etc/hosts description "original"

Windows domain name Local resolution file hosts is able to have a domain name on multiple IPs, if there is a problem with IP, can go to resolve to other IP

Linux local parsing file/etc/hosts, whether it can also do so. Here's a test.

Let's take a look at #解析器查询顺序配置文件

cat /etc/host.confmulti on

If you want to set the parsing order, the following

#表示先查询本地hosts文件, if there is no result, try to find the BIND DNS server

Order hosts, bind multi on

Use on or off as an option. This determines whether a host in the/etc/hosts can have several IP addresses, which is usually referred to as "multihomed." This flag is not useful for DNS or NIS requests.

Compiling the Hosts file

Cat /etc/hosts127.0. 0.1    localhost localhost.localdomain localhost4 localhost4.localdomain4::1         localhost Localhost.localdomain localhost6 localhost6.localdomain610.72. 16.60 api.weixin.qq.com 10.72. 16.62 api.weixin.qq.com 101.226. 212.27 api.weixin.qq.com

Test effect

[[Email protected] ~]# Telnet api.weixin.qq.com theTrying10.72.16.60... telnet:connect to address10.72.16.60: Connection refusedtrying10.72.16.62... telnet:connect to address10.72.16.62: Connection timed outtrying101.226.212.27... Connected to Api.weixin.qq.com.Escape character is'^]'. Connection closed by foreign host.

You can see that 10.72.16.60, 62 are inaccessible, and finally resolved to 101.226. on the 212.27.

But there will be a time-out. Connection timed out

Conclusion: As long as the local parsing profile opens multion, it can be a domain name for multiple IP

Configure configuration files for a Linux system DNS server

/etc/resolv.conf #配置Linux系统DNS服务器的配置文件

#表示DNS服务器域名是shanghai. The address of the Abc.com,dns server is 172.10.10.20

Search Shanghai. ABC.com

NameServer 172.10.10.20

Haha, at this time we ping sha-node-h on the local machine, successfully return the corresponding IP address 172.20.30.1, in addition, Ping www.baidu.com on the application server successfully returns the resolved IP address.

Reference

http://blog.csdn.net/hello_yang213/article/details/49364527

Https://zhidao.baidu.com/question/124826853.html

https://blog.xupeng.me/2013/05/15/multiple-ips-with-hosts/

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Linux Local parsing file/etc/hosts description "original"