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1.问题描述
cloudera-scm-server服务启动失败，日志报错如下：
2017-09-10 10:23:47,267 ERROR main:com.cloudera.enterprise.dbutil.DbUtil: InnoDB engine not found. Show engines reported: [MRG_MYISAM, CSV, MyISAM, MEMORY]
2017-09-10 10:23:47,268 ERROR main:com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean: InnoDb engine isn't present or enabled. SCM requires InnoDb MySQL db engine.
2.问题复现
测试环为CDH5.12.1，以下为复现步骤。
- 将/tmp目录修改为755权限
[root@ip-172-31-6-148 /]# chmod 755 tmp/
[root@ip-172-31-6-148 /]# ll
total 116
drwxr-xr-x. 231 root root 20480 Sep 10 15:48 tmp
[root@ip-172-31-6-148 /]# 
2.重启mysql服务
[root@ip-172-31-6-148 /]# service mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
[root@ip-172-31-6-148 /]# 
3.启动cloudera-scm-server服务
[root@ip-172-31-6-148 /]# service cloudera-scm-server restart
Stopping cloudera-scm-server: [ OK ]
Starting cloudera-scm-server: [ OK ]
[root@ip-172-31-6-148 /]#4.查看启动日志报错如问题描述一致
3.解决方法
将/tmp目录权限修改为777，重启mysql和cloudera-scm-server服务
- 修改/tmp目录权限为777
[root@ip-172-31-6-148 /]# chmod 777 tmp/
[root@ip-172-31-6-148 /]# ll
total 116
drwxrwxrwx. 231 root root 20480 Sep 10 15:48 tmp
[root@ip-172-31-6-148 /]# 
2.重启msyql服务
[root@ip-172-31-6-148 /]# service mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
[root@ip-172-31-6-148 /]# 
3.重启cloudera-scm-server服务
[root@ip-172-31-6-148 /]# service cloudera-scm-server restart
Stopping cloudera-scm-server: [ OK ]
Starting cloudera-scm-server: [ OK ]
[root@ip-172-31-6-148 /]#CM正常启动，问题解决。
4.备注
- 出现InnoDBengines not found
登录mysql通过show engines命令查看mysql引擎
mysql> show engines;
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO |
| InnoDB | YES | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
5 rows in set (0.00 sec)
mysql> 
注意：如果没有显示InnoDB Engine可能是/tmp目录权限不足导致，也可能是源码编译的时候未编译InnoDB引擎；
- 可以通过showplugins命令查看mysql支持的插件
mysql> show plugins;
+------------+--------+----------------+---------+---------+
| Name | Status | Type | Library | License |
+------------+--------+----------------+---------+---------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
+------------+--------+----------------+---------+---------+
7 rows in set (0.00 sec)
mysql> 
如果没有InnoDB则可以通过INSTALL命令安装
- 使用INSTALL命令安装InnoDB
查看mysql插件安装目录
mysql> show variables like 'plugin_dir';
+---------------+-------------------------+
| Variable_name | Value |
+---------------+-------------------------+
| plugin_dir | /usr/lib64/mysql/plugin |
+---------------+-------------------------+
1 row in set (0.00 sec)
查看linux目录下是否有ha_innodb*.so的文件
[root@ip-172-31-6-148 ~]# cd /usr/lib64/mysql/plugin
[root@ip-172-31-6-148 plugin]# ll
total 1416
lrwxrwxrwx 1 root root 25 Sep 10 15:47 ha_innodb_plugin.so -> ha_innodb_plugin.so.0.0.0
lrwxrwxrwx 1 root root 25 Sep 10 15:47 ha_innodb_plugin.so.0 -> ha_innodb_plugin.so.0.0.0
-rwxr-xr-x 1 root root 1259136 Jan 26 2017 ha_innodb_plugin.so.0.0.0
[root@ip-172-31-6-148 plugin]# 
执行Install命令安装InnoDB引擎
mysql> INSTALL PLUGIN InnoDB SONAME 'ha_innodb_plugin.so';
Query OK, 0 rows affected (0.23 sec)
mysql>
如果没有ha_innodb_plugin.so文件则需要考虑重新编译InnoDB引擎。
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