apple/container

[Request]: system property for default `--dns`.

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#1449 opened on Apr 25, 2026

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good first issuenetworknextux

Description

Feature or enhancement request details

NOTE: Depends on #1425; there's no point tackling this until the TOML configuration is in place.

We've a number of issues relating to DNS resolution from containers not working properly when a third party DNS server conflicts with the server that macOS mDNSResponder wants to start.

Until an OS-level solution can be provided, it would be useful to have a system property (and potentially environment variables if session level overrides seem sensible) that allows the user to configure default values for --dns.

We can also consider properties for the other DNS CLI options here as well.

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Contributor guide

Tech stack
swift
Domain
infrastructuredevops
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Issue #1425macOS DNS backgroundContainer tool configuration
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
First, review the implementation of issue #1425 which adds TOML configuration. Then examine the existing codebase for how system properties are handled (likely in a configuration manager class). The goal is to add a system property analogous to dns CLI option. Consider also adding properties for other DNS options as noted. No linked PRs or comments to reference.