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This article focuses on "how to solve the unknown variable 'defaults-file problem in mysql". Interested friends may wish to take a look. The method introduced in this article is simple, fast and practical. Let the editor take you to learn "how to solve the unknown variable' defaults-file problem in mysql"!

When initializing percona server 5.7,

Be sure to disable the default / etc/my.cnf mv or always give priority to reading the parameters according to the default configuration.

The error is as follows:

[root@fund-mgmt-db-mog-2] # / home/mysql/mysql/bin/mysqld-initialize-user=mysql-defaults-file=/home/mysql/my3310.cnf-basedir=/home/mysql/mysql-datadir=/home/mysql/my3310/data

2016-11-21T02:44:43.017602Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use-explicit_defaults_for_timestamp server option (see documentation for more details).

2016-11-21T02:44:43.179291Z 0 [Warning] InnoDB: New log files created, LSN=45790

2016-11-21T02:44:43.214156Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.

2016-11-21T02:44:43.267368Z 0 [ERROR] unknown variable 'defaults-file=/home/mysql/my3310.cnf'

2016-11-21T02:44:43.267390Z 0 [ERROR] Aborting

Solution: just adjust the order of the parameters

[root@fund-mgmt-db-mog-2] # / home/mysql/mysql/bin/mysqld-defaults-file=/home/mysql/my3310.cnf-initialize-user=mysql-basedir=/home/mysql/mysql-datadir=/home/mysql/my3310/data

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