不多说，直接上干货！
问题详情
2017-07-31 22:19:40,342 INFO main:com.cloudera.server.cmf.Main: Starting SCM Server. JVM Args: [-Dlog4j.configuration=file:/etc/cloudera-scm-server/log4j.properties, -Dfile.encoding=UTF-8, -Dcmf.root.logger=INFO,LOGFILE, -Dcmf.log.dir=/var/log/cloudera-scm-server, -Dcmf.log.file=cloudera-scm-server.log, -Dcmf.jetty.threshhold=WARN, -Dcmf.schema.dir=/usr/share/cmf/schema, -Djava.awt.headless=true, -Djava.net.preferIPv4Stack=true, -Dpython.home=/usr/share/cmf/python, -XX:+UseConcMarkSweepGC, -XX:+UseParNewGC, -XX:+HeapDumpOnOutOfMemoryError, -Xmx2G, -XX:MaxPermSize=256m, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=/tmp, -XX:OnOutOfMemoryError=kill -9 %p], Args: [], Version: 5.11.1 (#9 built by jenkins on 20170525-1410 git: 8adcfb8545cb0a35f590717b2626a9ea04948dae) 2017-07-31 22:19:40,416 INFO main:org.mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog 2017-07-31 22:19:40,535 INFO main:org.springframework.context.support.ClassPathXmlApplicationContext: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@60f9d924: startup date [Mon Jul 31 22:19:40 CST 2017]; root of context hierarchy 2017-07-31 22:19:40,591 INFO main:org.springframework.beans.factory.xml.XmlBeanDefinitionReader: Loading XML bean definitions from class path resource [webapp/WEB-INF/spring/beanRefFactory.xml] 2017-07-31 22:19:40,931 INFO main:org.springframework.beans.factory.support.DefaultListableBeanFactory: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@71919998: defining beans [bootstrapContext,rootContext]; root of factory hierarchy 2017-07-31 22:19:40,958 INFO main:org.springframework.context.support.GenericApplicationContext: Refreshing org.springframework.context.support.GenericApplicationContext@6eeae9f1: startup date [Mon Jul 31 22:19:40 CST 2017]; root of context hierarchy 2017-07-31 22:19:40,960 INFO main:org.springframework.beans.factory.support.DefaultListableBeanFactory: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@67a81efd: defining beans [commandLineConfigurationBean,entityManagerFactoryBean,com.cloudera.server.cmf.TrialState,com.cloudera.server.cmf.TrialManager,com.cloudera.cmf.crypto.LicenseLoader]; root of factory hierarchy 2017-07-31 22:19:41,064 INFO main:com.cloudera.enterprise.CommonMain: Reading database properties from /etc/cloudera-scm-server/db.properties 2017-07-31 22:19:41,067 INFO main:com.cloudera.enterprise.CommonMain: Statistics not enabled, c3p0 JMX disabled 2017-07-31 22:19:41,196 INFO main:org.hibernate.annotations.common.Version: HCANN000001: Hibernate Commons Annotations {4.0.2.Final} 2017-07-31 22:19:41,201 INFO main:org.hibernate.Version: HHH000412: Hibernate Core {4.2.2.Final} 2017-07-31 22:19:41,203 INFO main:org.hibernate.cfg.Environment: HHH000206: hibernate.properties not found 2017-07-31 22:19:41,204 INFO main:org.hibernate.cfg.Environment: HHH000021: Bytecode provider name : javassist 2017-07-31 22:19:41,498 INFO main:org.hibernate.cfg.Configuration: HHH000221: Reading mappings from resource: cmf.hbm.xml 2017-07-31 22:19:41,720 INFO main:org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator: HHH000130: Instantiating explicit connection provider: org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider 2017-07-31 22:19:41,721 INFO main:org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider: HHH010002: C3P0 using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost/scm?useUnicode=true&characterEncoding=UTF-8 2017-07-31 22:19:41,721 INFO main:org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider: HHH000046: Connection properties: {user=scm, password=****, autocommit=true, release_mode=auto} 2017-07-31 22:19:41,721 INFO main:org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider: HHH000006: Autocommit mode: true 2017-07-31 22:19:41,722 INFO main:org.springframework.beans.factory.support.DefaultListableBeanFactory: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@67a81efd: defining beans [commandLineConfigurationBean,entityManagerFactoryBean,com.cloudera.server.cmf.TrialState,com.cloudera.server.cmf.TrialManager,com.cloudera.cmf.crypto.LicenseLoader]; root of factory hierarchy 2017-07-31 22:19:41,723 ERROR main:com.cloudera.server.cmf.Main: Server failed. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.cloudera.server.cmf.TrialState': Cannot resolve reference to bean 'entityManagerFactoryBean' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactoryBean': FactoryBean threw exception on object creation; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106) at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:616) at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:148) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1003) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:907) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:192) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425) at com.cloudera.server.cmf.Main.bootstrapSpringContext(Main.java:387) at com.cloudera.server.cmf.Main.<init>(Main.java:242) at com.cloudera.server.cmf.Main.main(Main.java:216) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactoryBean': FactoryBean threw exception on object creation; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149) at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102) at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1440) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:247) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:192) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322) ... 17 more Caused by: javax.persistence.PersistenceException: [PersistenceUnit: cmf.server] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63) at com.cloudera.enterprise.CommonMain.setupHibernate(CommonMain.java:183) at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:114) at com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean.getObject(EntityManagerFactoryBean.java:65) at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142) ... 22 more Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: HHH010003: JDBC Driver class not found: com.mysql.jdbc.Driver at org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:142) at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89) at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131) at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1797) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1755) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914) ... 29 more Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver] at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:149) at org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:139) ... 41 more Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:296) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:278) at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:146) ... 42 more root@nssa-sensor1:/var/log/cloudera-scm-server#
问题分析
其实啊，这个问题不难，它是属于启动后，自己又快速地挂掉了。
解决办法
首先，
/etc/cloudera-scm-server/db.properties file is removed
清空删除这所有的db.properties配置文件
同时，很明显，是JDBC的问题
官网地址是
https://www.cloudera.com/documentation/enterprise/5-5-x/topics/cm_ig_mysql.html
其次，还要
然后，问题一定可以解决了
参考
http://www.cnblogs.com/spec-dog/p/4664944.html
http://www.lai18.com/content/4789071.html
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