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Posted to notifications@apisix.apache.org by GitBox <gi...@apache.org> on 2020/12/05 10:19:26 UTC
[GitHub] [apisix] dickens7 opened a new issue #2973: upstream service parsed by CNAME raises exception
dickens7 opened a new issue #2973:
URL: https://github.com/apache/apisix/issues/2973
The upstream proxy service is exposed through CNAME, and the domain name is accelerated by Alibaba Cloud. After setting the domain name as upstream, Apisix will resolve and cache the IP address for the domain name. This resulted in the upstream being unable to be properly proxied.
- [AlibabaCloud Dynamic Route for Content Delivery Network](https://help.aliyun.com/product/64812.html)
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[GitHub] [apisix] spacewander closed issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
spacewander closed issue #2973:
URL: https://github.com/apache/apisix/issues/2973
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[GitHub] [apisix] spacewander commented on issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
spacewander commented on issue #2973:
URL: https://github.com/apache/apisix/issues/2973#issuecomment-785516688
Now we cache the record according to the TTL. Feel free to reopen it if the problem is still exist.
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[GitHub] [apisix] membphis commented on issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
membphis commented on issue #2973:
URL: https://github.com/apache/apisix/issues/2973#issuecomment-739500202
> I am wondering if I can add a configuration for `dns_no_cache` to upstream to solve this kind of problem.
Do you want to resolve the domain in every request? What is the reason for this way?
As I know, if there is no cache, it will lead to poor performance.
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[GitHub] [apisix] dickens7 commented on issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
dickens7 commented on issue #2973:
URL: https://github.com/apache/apisix/issues/2973#issuecomment-739313570
This does not really solve the problem, and it will affect all upstream services after changing `dns_resolver_valid` default value.
I am wondering if I can add a configuration for `dns_no_cache` to upstream to solve this kind of problem.
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[GitHub] [apisix] dickens7 commented on issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
dickens7 commented on issue #2973:
URL: https://github.com/apache/apisix/issues/2973#issuecomment-740307037
yes this will cause severe performance degration. And this requires further study of th accelearation service provided by different vendors. just put this issue aside, and i will supplement this later
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[GitHub] [apisix] membphis commented on issue #2973: upstream service parsed by CNAME raises exception
Posted by GitBox <gi...@apache.org>.
membphis commented on issue #2973:
URL: https://github.com/apache/apisix/issues/2973#issuecomment-739205187
> Apisix will resolve and cache the IP address for the domain name
parse and cache in lrucache:
https://github.com/apache/apisix/blob/master/apisix/init.lua#L120-L122
and the cache time is 30 sec by default, you can specify a new value:
https://github.com/apache/apisix/blob/master/conf/config-default.yaml#L101
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