我是新来的，希望有人能帮我解决mysql问题。
在这里，我遇到了一个奇怪的情况，innodb不是默认的存储引擎：
mysql版本14.14发行版5.6.39，用于linux（x86\u 64），使用editline Package 器。
linux发行版：centos linux 7.5.1804版（核心版）
我尝试了几乎每一个解决方案，使innodb成为默认引擎，但它确实为我工作。
以下是我尝试过的几件事：
第一步

files my.cnf and my.ini. has been edited in /root/my.cnf and /root/my.ini and /etc/my.cnf as:
[mysqld]
character-set-server=utf8
collation-server=utf8_bin
default-storage-engine=INNODB
max_allowed_packet=256M
innodb_log_file_size=2GB
transaction-isolation=READ-COMMITTED
binlog_format=row

步骤2保存文件后，我确实用几种方法重新启动了mysql：

Following commands DID NOT work:
# /etc/init.d/mysqld stop:  No such file or directory
# /etc/init.d/mysql stop:  No such file or directory
# service mysqld stop
Redirecting to /bin/systemctl start mysql.service
Failed to start mysqld.service: Unit not found.
Following commands DID work:
# service mysql stop
Redirecting to /bin/systemctl start mysql.service
# service mysql status (was Active: inactive (dead))
# service mysql start
Redirecting to /bin/systemctl start mysql.service
# service mysql status (was Active: active (running))

第3步

mysql> SHOW ENGINES;
    +--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
    | Engine             | Support | Comment                                                        
    | Transactions | XA   | Savepoints |
    +--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
    | FEDERATED          | NO      | Federated MySQL storage engine                                 
    | NULL         | NULL | NULL       |
    | MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          
    | NO           | NO   | NO         |
    | MyISAM             | DEFAULT | MyISAM storage engine                                          
    | NO           | NO   | NO         |
    | BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
    | CSV                | YES     | CSV storage engine                                             
    | NO           | NO   | NO         |
    | MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
    | ARCHIVE            | YES     | Archive storage engine                                         
    | NO           | NO   | NO         |
    | InnoDB             | YES     | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES        |
    | PERFORMANCE_SCHEMA | YES     | Performance Schema                                             
    | NO           | NO   | NO         |
    +--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
    9 rows in set (0.00 sec)
    mysql>

第四步我尝试了下面的命令，最后我得到了innodb作为默认值，但仍然没有工作，因为一旦你重置mysqld它会回到myisam是默认值

SET default_storage_engine=INNODB;

这真是令人沮丧，你的帮助将不胜感激