Centos - golang 1.6/1.7 - dial tcp i/o timeout

[subbagu...@gmail.com]

Getting dail tcp error while calling httpClient.Get or httpClient.Post

http client settings:
httpClient = &http.Client{
Timeout: 30 * time.Second,
}

Error:

dial tcp: lookup on xx.xx.xx.xxx:53: dial udp xx.xx.xx.xxx:53: i/o timeout

CentOS version: CentOS Linux release 7.2.1511 (Core) 

can you provide the resolution for this?

[Ian Lance Taylor]

Looks like your DNS server is not responding to your Go program. Any
idea why? Firewall issue? Misunderstanding of DNS config files? You
could try setting `GODEBUG=netdns=cgo` in the environment; see
https://golang.org/pkg/net.

Ian

[robert...@gmail.com]

Is there a way in Golang to cache the response from the DNS server? Java apps by default cache the DNS info until the app gets restarted.

[Ian Lance Taylor]

On Mon, Oct 17, 2016 at 8:26 AM, <robert...@gmail.com> wrote:
> Is there a way in Golang to cache the response from the DNS server? Java
> apps by default cache the DNS info until the app gets restarted.

You can do DNS lookups yourself using `net.LookupHost` and friends.

Ian

> On Sunday, October 16, 2016 at 5:01:44 PM UTC-5, Ian Lance Taylor wrote:
>>
>> On Sun, Oct 16, 2016 at 9:10 AM, <subbagu...@gmail.com> wrote:
>> >
>> > Getting dail tcp error while calling httpClient.Get or httpClient.Post
>> >
>> >
>> > http client settings:
>> > httpClient = &http.Client{
>> > Timeout: 30 * time.Second,
>> > }
>> >
>> > Error:
>> >
>> > dial tcp: lookup on xx.xx.xx.xxx:53: dial udp xx.xx.xx.xxx:53: i/o
>> > timeout
>> >
>> >
>> > CentOS version: CentOS Linux release 7.2.1511 (Core)
>> >
>> >
>> > can you provide the resolution for this?
>>
>> Looks like your DNS server is not responding to your Go program. Any
>> idea why? Firewall issue? Misunderstanding of DNS config files? You
>> could try setting `GODEBUG=netdns=cgo` in the environment; see
>> https://golang.org/pkg/net.
>>
>> Ian
>

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[subbagu...@gmail.com]

This issue was due to golang 1.7 version and it is resolved after build the code with golang 1.7.1 version.

For details:

https://github.com/golang/go/issues/16865