If you do need to specify a MySQL socket, not being able to do so during installation causes installation to fail. Not sure if this should be marked critical because of that?
In some cases the host:port based connection is disabled.
Document all database settings, including socket, in default.settings.php.
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Related to this issue: #561400: No way to specify MySQL socket with DBTNG →
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9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This was a bugsmash triage target a few days ago. lendude, borisson_ and myself agree that this should be addresses in documentation, not code. Comment #35 explains our viewpoint.
Changing to the DX special tag defined on Issue tags -- special tags → .