Copying jenkins.mysql.cnf to conf.d directory does not load configuration even though it ends in .cnf about mysql HOT 4 CLOSED

I don't think the two periods are the issue. The code that checks filenames is here: https://github.com/mysql/mysql-server/blob/7e58ce8e69de5a4e941d913999cbbf905fe8f444/mysys_ssl/my_default.cc

It calls, fn_ext to get the extension for each file in the !includedir and checks it against the list of allowed extensions (.cnf on Unix, .cnf and .ini on Windows). The fn_ext function has this description:

The extension is defined as everything after the last extension character (normally '.') after the directory name.

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Could it be that your jenkins.mysql.cnf is world-writable?

Quoting the MySQL manual at https://dev.mysql.com/doc/refman/5.6/en/option-files.html:
"On Unix platforms, MySQL ignores configuration files that are world-writable. This is intentional as a security measure."

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@joshunger, could you pastebin the startup log? if the file is world-writable a warning will be shown within it.

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Closing old issue -- if this is still a problem (and can be easily reproduced), please open a new issue! (alternatively, the Docker Forums and the #docker IRC channel on Freenode are available for general help)

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