apple/container

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

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#1,449 opened on Apr 25, 2026

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good first issuenetworknextux

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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

Research direction
Examine existing system property implementations and understand the TOML configuration from issue #1425. Then implement a new system property to override default DNS values, similar to other properties.
Tech stack
swift
Domain
cliinfrastructure
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.
1-2 days
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
SwiftTOML
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60