centos7 - 请教：CentOS 下 Mysql 无法启动， selinux 为disabled

错误信息为：

[root@server1 ~]# cat /usr/local/mysql/var/server1.err
160916 12:17:12 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
2016-09-16 12:17:12 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-09-16 12:17:12 0 [Note] /usr/sbin/mysqld (mysqld 5.6.33-log) starting as process 14526 ...
2016-09-16 12:17:12 14526 [Note] Plugin 'FEDERATED' is disabled.
2016-09-16 12:17:12 14526 [Warning] The option innodb (skip-innodb) is deprecated and will be removed in a future release
2016-09-16 12:17:12 14526 [Note] Plugin 'InnoDB' is disabled.
2016-09-16 12:17:12 14526 [ERROR] Unknown/unsupported storage engine: InnoDB
2016-09-16 12:17:12 14526 [ERROR] Aborting

2016-09-16 12:17:12 14526 [Note] Binlog end
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'partition'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_METRICS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMPMEM'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_CMP'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_LOCKS'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'INNODB_TRX'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'BLACKHOLE'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'ARCHIVE'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'MRG_MYISAM'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'MyISAM'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'MEMORY'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'CSV'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'sha256_password'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'mysql_old_password'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'mysql_native_password'
2016-09-16 12:17:12 14526 [Note] Shutting down plugin 'binlog'
2016-09-16 12:17:12 14526 [Note] /usr/sbin/mysqld: Shutdown complete

160916 12:17:12 mysqld_safe mysqld from pid file /usr/local/mysql/var/server1.pid ended

请教下这究竟是什么原因导致的？