[26.1 backport] Forward DNS requests into --internal networks #47832
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A recent change to prevent containers only connected to --internal networks from communicating with external DNS servers inadvertently prevented the daemon's internal DNS server from forwarding requests within an internal network to a containerised DNS server. Relax the check, so that only requests that need to be forwarded from the host's network namespace are dropped. External DNS servers remain unreachable from the internal network. Signed-off-by: Rob Murray <rob.murray@docker.com> (cherry picked from commit 77a47db) Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
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[](https://renovatebot.com) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [docker/docker](https://togithub.com/docker/docker) | patch | `26.1.2` -> `26.1.3` | --- ### Release Notes <details> <summary>docker/docker (docker/docker)</summary> ### [`v26.1.3`](https://togithub.com/moby/moby/releases/tag/v26.1.3) [Compare Source](https://togithub.com/docker/docker/compare/v26.1.2...v26.1.3) #### 26.1.3 For a full list of pull requests and changes in this release, refer to the relevant GitHub milestones: - [docker/cli, 26.1.3 milestone](https://togithub.com/docker/cli/issues?q=is%3Aclosed+milestone%3A26.1.3) - [moby/moby, 26.1.3 milestone](https://togithub.com/moby/moby/issues?q=is%3Aclosed+milestone%3A26.1.3) - Deprecated and removed features, see [Deprecated Features](https://togithub.com/docker/cli/blob/v26.1.3/docs/deprecated.md). - Changes to the Engine API, see [API version history](https://togithub.com/moby/moby/blob/v26.1.3/docs/api/version-history.md). ##### Bug fixes and enhancements - Fix a regression that prevented the use of DNS servers within a `--internal` network. [moby/moby#47832](https://togithub.com/moby/moby/pull/47832) - When the internal DNS server's own address is supplied as an external server address, ignore it to avoid unproductive recursion. [moby/moby#47833](https://togithub.com/moby/moby/pull/47833) ##### Packaging updates - Allow runc to kill containers when confined to the runc profile in AppArmor version 4.0.0 and later. [moby/moby#47829](https://togithub.com/moby/moby/pull/47829) </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 6am on monday" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/earthly/dind). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zNzcuOCIsInVwZGF0ZWRJblZlciI6IjM3LjM3Ny44IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJyZW5vdmF0ZSJdfQ==--> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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[](https://renovatebot.com) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [docker/docker](https://togithub.com/docker/docker) | patch | `26.1.2` -> `26.1.3` | --- ### Release Notes <details> <summary>docker/docker (docker/docker)</summary> ### [`v26.1.3`](https://togithub.com/moby/moby/releases/tag/v26.1.3) [Compare Source](https://togithub.com/docker/docker/compare/v26.1.2...v26.1.3) #### 26.1.3 For a full list of pull requests and changes in this release, refer to the relevant GitHub milestones: - [docker/cli, 26.1.3 milestone](https://togithub.com/docker/cli/issues?q=is%3Aclosed+milestone%3A26.1.3) - [moby/moby, 26.1.3 milestone](https://togithub.com/moby/moby/issues?q=is%3Aclosed+milestone%3A26.1.3) - Deprecated and removed features, see [Deprecated Features](https://togithub.com/docker/cli/blob/v26.1.3/docs/deprecated.md). - Changes to the Engine API, see [API version history](https://togithub.com/moby/moby/blob/v26.1.3/docs/api/version-history.md). ##### Bug fixes and enhancements - Fix a regression that prevented the use of DNS servers within a `--internal` network. [moby/moby#47832](https://togithub.com/moby/moby/pull/47832) - When the internal DNS server's own address is supplied as an external server address, ignore it to avoid unproductive recursion. [moby/moby#47833](https://togithub.com/moby/moby/pull/47833) ##### Packaging updates - Allow runc to kill containers when confined to the runc profile in AppArmor version 4.0.0 and later. [moby/moby#47829](https://togithub.com/moby/moby/pull/47829) </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 6am on monday" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/earthly/dind). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zNzcuOCIsInVwZGF0ZWRJblZlciI6IjM3LjM3Ny44IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJyZW5vdmF0ZSJdfQ==--> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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- What I did
Fixes #47822
#47538 prevents containers only connected to
--internalnetworks from communicating with external DNS servers - it also inadvertently prevents the daemon's internal DNS server from forwarding requests within an internal network to a containerised DNS server.- How I did it
Relax the check, so that only requests that need to be forwarded from the host's network namespace are dropped.
External DNS servers remain unreachable from the internal network.
- How to verify it
New integration test.
- Description for the changelog