初始化 percona server  5.7 的时候  
一定要把默认的 /etc/my.cnf  mv 掉 否则一直优先按照默认配置进行参数读取
报错如下：

[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

解决办法： 调整一下参数顺序就好了

[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