fix upstream dns url fix

Author: surajnarwade

Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.k8s.io/node-problem-detector/node-problem-detector:v0.8.12
+FROM registry.k8s.io/node-problem-detector/node-problem-detector:v0.8.13
 
 RUN set -eux; \
   apt-get update; \

config/local-dns-resolver-config.json

@@ -21,7 +21,7 @@
       "reason": "NodeLocalDnsResolutionFailing",
       "path": "./config/plugin/local_dns_resolver.sh",
       "args": [
-        "169.254.20.10"
+        "kube-dns-upstream.kube-system.svc.cluster.local."
       ]
     }
   ]

config/plugin/upstream_dns_resolver.sh

@@ -6,9 +6,11 @@ UNKNOWN=2
 
 readonly fqdn_a_record="$1"
 
+
+
 # We send a single attempt only, without retries and with 1s timeout.
 # We expect to receive an IPv4 address for a given A record.
-dig_cmd_out="$(dig -t A @169.254.20.10 +tries=1 +retry=0 +time=1 +short "${fqdn_a_record}" 2>&1 | head -n1)"
+dig_cmd_out="$(dig -t A @${LOCAL_DNS_RESOLVER_IP} +tries=1 +retry=0 +time=1 +short "${fqdn_a_record}" 2>&1 | head -n1)"
 dig_cmd_return_code="$?"
 dig_cmd_out_ipv4ish="$(echo "${dig_cmd_out}" | grep -E -o "^([0-9]{1,3}[\.]){3}[0-9]{1,3}$")"