Openshift中的NGINX-NGINX无法解析内部主机名 [英] NGINX in Openshift - NGINX can't resolve internal hostnames

问题描述

使用变量重写&在Nginx容器的proxy_pass配置中代理内部Openshift服务时，由于必需的解析器，NGINX无法解析该服务的DNS.例如:

When using a variable to rewrite & proxy to an internal Openshift service within an nginx container's proxy_pass config, NGINX can't resolve the service's DNS due to a required resolver. For instance:

location /api/ {
   set $pass_url http://service.namespace.svc:8080$request_uri;
   proxy_pass  $pass_url;
}

使用标准Kubernetes时，我可以使用 kube-dns.kube-system.svc.cluster.local 作为解析器:

When using standard Kubernetes, I can use kube-dns.kube-system.svc.cluster.localas the resolver:

resolver kube-dns.kube-system.svc.cluster.local;

但是Openshift不提供此功能.我尝试使用容器的/etc/resolv.conf 中的IP，该IP只是群集中运行DNS服务器的节点之一，但仍然无法解析

But Openshift doesn't provide this. I've tried using the IP that is in the container's /etc/resolv.conf, which is just one of the nodes in my cluster that is running the DNS server, but it still can't resolve.

最奇怪的部分是容器终端内部的 nslookup service.namespace.svc 使用/etc/resolv.conf 中的名称服务器，并且工作正常.

Weirdest part is nslookup service.namespace.svc from inside the container terminal uses the nameserver in /etc/resolv.conf and it works fine.

我可以使用Openshift中的Kubernetes DNS主机名等效项，还是解决此问题的另一种解决方案?

Is there an equivalent to the Kubernetes DNS hostname in Openshift I could use, or perhaps another solution to work around this?

推荐答案

在OpenShift 4.7中运行ngnix，我可以通过添加解决该问题

Running ngnix in OpenShift 4.7 I was able to work around this issue by adding

解析器dns-default.openshift-dns.svc.cluster.local

到 server 配置.显然，ngnix不会解析/etc/resolv.conf ，但是(以我为例)， dns-default.openshift-dns.svc.cluster.local 也可以解析为 172.30.0.10 ，在/etc/resolv.conf 中被定义为 nameserver .

to the server configuration. Apparently, ngnix is not parsing /etc/resolv.conf, but (in my case), dns-default.openshift-dns.svc.cluster.local also resolves to 172.30.0.10, which was defined as a nameserver in /etc/resolv.conf.

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