Question

尝试使用Resolv::DNS解析MX记录时遇到问题。当我在irb中直接在我的Mac上执行以下行时，一切正常：

> require "resolv"
> Resolv::DNS.new.getresource("stackoverflow.com", Resolv::DNS::Resource::IN::MX)
=> #<Resolv::DNS::Resource::IN::MX:0x00007fba42812ff0 @preference=10, @exchange=#<Resolv::DNS::Name: alt4.aspmx.l.google.com.>, @ttl=243>

在docker容器内执行的同一行返回错误：

> require "resolv"
> Resolv::DNS.new.getresource("stackoverflow.com", Resolv::DNS::Resource::IN::MX)
Resolv::ResolvError: DNS result has no information for stackoverflow.com
from /usr/local/lib/ruby/2.4.0/resolv.rb:492:in `getresource'

我认为问题是docker-machine。我使用以下配置运行了dinghy 4.6.3（请参阅https://github.com/codekitchen/dinghy）配置的docker-machine：

Boot2Docker version 18.01.0-ce, build HEAD : 0bb7bbd - Thu Jan 11 16:32:39 UTC 2018
Docker version 18.01.0-ce, build 03596f5

docker@dinghy:~$ busybox | head -1
BusyBox v1.27.2 (2017-10-30 14:58:40 UTC) multi-call binary.

我的docker容器基于ruby:2.4.3-stretch。

我不确定resolv.conf

是否是一个简单的问题

docker@dinghy:~$ cat /etc/resolv.conf 
nameserver 10.0.2.3

配置是否足以进行mx查找？

更新

这是来自容器内的dig响应（不是来自docker-machine本身，不幸的是，dig包没有随busybox一起提供）：

root@3ef2090b7864:/usr/src/app# dig @10.0.2.3 MX stackoverflow.com

; <<>> DiG 9.10.3-P4-Debian <<>> @10.0.2.3 MX stackoverflow.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOTIMP, id: 32375
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;stackoverflow.com.     IN  MX

;; Query time: 0 msec
;; SERVER: 10.0.2.3#53(10.0.2.3)
;; WHEN: Tue Apr 03 14:29:30 CEST 2018
;; MSG SIZE  rcvd: 46

在Docker-machine中，Resolv :: DNS与MX失败

0 个答案: