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DNS 无法解析主机

tag-icon • tag-icon networking dns glibc
DNS 无法解析主机

我最近升级了我的 Ubuntu，突然丢失了 DNS。看起来，这与https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674532。但我无法运行更新来修复该问题，因为它无法使用 DNS 进行更新。有没有关于如何让 DNS 重新工作以便我可以运行更新并修复该问题的文档？我尝试过更改 DNS 服务器，但一切都不起作用。

猫/etc/resolv.conf

nameserver 8.8.8.8  
nameserver 8.8.4.4

cat /etc/NetworkManager/NetworkManager.conf

[main]  
plugins=ifupdown,keyfile,ofono  
dns=dnsmasq

[ifupdown]  
managed=false

dpkg-l 命令域名系统|删除

ii avahi-dns confd      0.6.32~rc+dfsg-1ubuntu2 amd64   Avahi DNS configuration tool  
ii dnsmasq-base         2.75-1ubuntu0.16.04.1   amd64   Small caching DNS proxy and DHCP/TFTP Server  
ii dnsutils             1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   Clients Provided with BIND  
ii libavahi-compact-libdnssd1:amd64    0.6.32~rc+dfsg-1ubuntu2   amd64   Avahi Apple Bonjour compatibility library  
ii libdns-export162     1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   Exported DNS Shared Library  
ii libdns162:amd64      1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   DNS Shared Library used by BIND  
ii libnss-mdns:amd64    0.10-7     amd64     NSS Module for Multicast DNS name resolution

主机 -v www.apple.com

Trying "www.apple.com"  
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1102  
;; flags: qr rd ra; QUERY: 1; ANSWER: 4; AUTHORITY: 0, ADDITIONAL: 0  

;;QUESTION SECTION:  
;www.apple.com.     IN      A  

;;ANSWER SECTION:  
www.apple.com.  1126    IN  CNAME   www.apple.com.edgekey.net.  
www.apple.com.edgekey.net.  21568   IN  CNAME   www.apple.com.edgekey.net.globalredir.akadns.net  
www.apple.com.edgekey.net.globalredir.akadns.net.   3599    IN  CNAME   e6858.dsce9.akamaiedge.net
e6858.dsce9.akamaiedge.net. 19  IN  A   172.226.108.101

Received 182 bytes from 8.8.8.8#53 in 152 ms  
Trying "e6858.dsce9.akamaiedge.net"  
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:428  
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY:0, ADDITIONAL: 0  

;;QUESTION SECTION  
;e6858.dsce9.akamaiedge.net.    IN  AAAA  

;;ANSWER SECTION:  
e6858.dsce9.akamaiedge.net. 19  IN  AAAA    2001:559:19:988d::1aca  
e6858.dsce9.akamaiedge.net. 19  IN  AAAA    2001:559:19:988d::1aca  

Received 100 bytes from 8.8.8.8#53 in 70 ms  
Trying "e6858.dsce9.akamaiedge.net"  
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:34978  
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY:1, ADDITIONAL: 0  

;;QUESTION SECTION:  
;e6858.dsce9.akamaiedge.net.    IN  MX  

;;AUTHORITY SECITON:  
dsce9.akamaiedge.net.   179 IN  SOA n0dsce9.akamaiedge.net.   hostmaster.akamai.com.    1490629947 1000 1000 1000 1800  

Received 109 bytes from 8.8.8.8#53 in 32 ms

dpkg -l | grep libc6

ii libc6:amd64  2.23-0ubuntu7   amd64   GNU C Library: Shared Libraries  
ii libc6-dev:amd64  2.23-0ubuntu7   amd64   GNU C Library: Development Libraries and Header Files

答案1

存储有关解析域名时要咨询哪些 DNS 服务器的信息的文件是/etc/resolv.conf。但此文件的问题在于，强烈建议不要手动编辑该文件，因为如果您这样做，它很快就会被程序自动覆盖resolvconf。但是，您可以做的是将以下几行添加到文件/etc/resolvconf/resolv.conf.d/head：

# Google's public DNS servers
nameserver 8.8.8.8    # Primary DNS server
nameserver 8.8.4.4    # Secondary DNS server

该文件在构建时使用/etc/resolv.conf。具体来说，它的内容被添加到文件的开头/etc/resolv.conf。

答案2

当更新解决问题时，没有 DNS 实现这一点应该不会太难。也许一个解决方法是找出更新服务器的 IP 地址，并将其输入到 /etc/apt/sources.list 中，而不是输入完全限定域名。

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