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Use configured DNS name to lookup instance IP address #1362

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#1364
#1363
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Use configured DNS name to lookup instance IP address#1362
#1364
#1363
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hessjcg
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priority: p1Important issue which blocks shipping the next release. Will be fixed prior to next release.type: feature request‘Nice-to-have’ improvement, new feature or different behavior or design.

Description

@hessjcg
hessjcg
opened on Dec 17, 2025

Bug Description

When a custom DNS name is used to connect to a Cloud SQL instance, the dialer should first attempt to resolve the custom DNS name to an IP address and use that for the connection. If the lookup fails, the dialer should fall back to using the IP address from the instance metadata.

This change modifies the dialer to:

  • Use the configured resolver to look up the host's IP address.
  • Use the IP address from the A record of the custom DNS name if available.
  • Fall back to the IP address from the instance metadata if the A record is not available.

See also GoogleCloudPlatform/cloud-sql-go-connector#1053

Activity

  1. hessjcg
    added
    type: bugError or flaw in code with unintended results or allowing sub-optimal usage patterns.
    on Dec 17, 2025
  2. blunderbuss-gcf
    assigned
    hessjcg
    on Dec 17, 2025
  3. hessjcg
    added
    type: feature request‘Nice-to-have’ improvement, new feature or different behavior or design.
    priority: p1Important issue which blocks shipping the next release. Will be fixed prior to next release.
    and removed
    type: bugError or flaw in code with unintended results or allowing sub-optimal usage patterns.
    on Dec 17, 2025
  4. hessjcg
    added 3 commits that reference this issue on Dec 17, 2025

    feat: Use configured DNS name to lookup instance IP address

    e3db350

    feat: Use configured DNS name to lookup instance IP address

    f0e5f23

    feat: Use configured DNS name to lookup instance IP address

    dcce02e
  5. hessjcg
    closed this as completedin #1363on Dec 17, 2025
  6. hessjcg
    added a commit that references this issue on Dec 17, 2025

    feat: Use configured DNS name to lookup instance IP address (#1363)

    18eddc4
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priority: p1Important issue which blocks shipping the next release. Will be fixed prior to next release.type: feature request‘Nice-to-have’ improvement, new feature or different behavior or design.

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