envoyproxy/envoy

no_default_search_domain does not take effect

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#33,138 opened on Mar 27, 2024

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area/dnsbughelp wanted

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Description

no_default_search_domain in dns_resolver_options does not take effect

Description: I am using dynamic_forward_proxy cluster, and sub_clusters_config is selected. To suppress too many request towards local DNS, I configured DNS resolver in cluster level image

But the test result is that envoy still search the default domain, and dns resolution failed in my case. my host name in request is: a.com my expectation is envoy query a.com directly to my configured dns server the result is envoy query a.com.mynamespace.svc.cluster.local, mynamespace.svc.cluster.local is the first records in my /etc/resolv.conf

in my /etc/resolv.conf: search mynamespace.svc.cluster.local svc.cluster.local cluster.local abcd nameserver 1.1.1.1 options ndots:5

Contributor guide

Research direction
Investigate how the 'no default search domain' option is handled in the DNS resolver code, specifically in the dynamic forward proxy cluster configuration. Trace the configuration parsing and DNS query building to identify where the search domains are being appended despite the option being set.
Tech stack
cpp
Domain
networking
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++NetworkingDNS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60