Cloudera Manager、CDH零基础入门、线路指导 http://www.aboutyun.com/thread-9219-1-1.html (出处: about云开发)

集群搭建：主机宽带拨号上网，虚拟机使用桥接模式，该如何ping通外网
集群搭建必备：虚拟机之一实现Host-only方式上网
集群搭建必备：nat模式设置静态ip，达到上网与主机相互通信
云技术基础：学习hadoop使用零基础linux(Ubuntu)笔记
搭建集群必知：Linux常用命令及修改文件总结（不断更新）    
Linux网络接口ifconfig命令及认识网络接口lo
linux入门详细介绍
虚拟机安装linux网络配置资料大全
解决遇到Linux网络配置，从熟悉网络配置文件入手（大体了解即可）
linux入门大全：包括零基础入门，Linux详细介绍
Linux重启方式init 0 init1 init 3 init 5 init 6 这几个启动级别都代表什么意思？
Ubuntu常用命令总结及修改DNS的多种方法总结
Linux关机各种关机命令总结
Linux基础必懂：eth0,eth1,eth2,lo是什么意思？

学而不思则罔 思而不学则殆

Detecting Cloudera Manager Server...
Detecting Cloudera Manager Server...
BEGIN host -t PTR 192.168.1.198
198.1.168.192.in-addr.arpa domain name pointer localhost.
END (0)
using localhost as scm server hostname
BEGIN which python
/usr/bin/python
END (0)
BEGIN python -c ‘import socket; import sys; s = socket.socket(socket.AF_INET); s.settimeout(5.0); s.connect((sys.argv[1], int(sys.argv[2]))); s.close();‘ localhost 7182
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "<string>", line 1, in connect
socket.error: [Errno 111] Connection refused
END (1)
could not contact scm server at localhost:7182, giving up
waiting for rollback request

sudo apt-get -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold -y install oracle-j2sdk1.7

Caused by: org.springframework.beans.factory.BeanCreationException: Error creati
ng bean with name ‘entityManagerFactoryBean‘: FactoryBean threw exception on obj
ect creation; nested exception is javax.persistence.PersistenceException: org.hi
bernate.exception.GenericJDBCException: Could not open connection
        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.getObje
ctForBeanInstance(AbstractBeanFactory.java:1440)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBe
an(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: org.hibernate.exception.Gener
icJDBCException: Could not open connection
        at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMan
agerImpl.java:1387)
        at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityMan
agerImpl.java:1310)
        at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException
(AbstractEntityManagerImpl.java:1397)
        at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:62)
        at com.cloudera.enterprise.AbstractWrappedEntityManager.beginForRollback
AndReadonly(AbstractWrappedEntityManager.java:85)
        at com.cloudera.enterprise.dbutil.DbUtil.isInnoDbEnabled(DbUtil.java:472
)



2014-09-22 17:51:27,328 ERROR [main:spi.SqlExceptionHelper@147] An attempt by a 
client to checkout a Connection has timed out.
2014-09-22 17:51:27,339  INFO [main:support.DefaultListableBeanFactory@422] Dest
roying singletons in org.springframework.beans.factory.support.DefaultListableBe
anFactory@715dcdeb: defining beans [commandLineConfigurationBean,entityManagerFa
ctoryBean,com.cloudera.server.cmf.TrialState,com.cloudera.server.cmf.TrialManage
r,com.cloudera.cmf.crypto.LicenseLoader]; root of factory hierarchy
2014-09-22 17:51:27,341 ERROR [main:cmf.Main@202] Server failed.
org.springframework.beans.factory.BeanCreationException: Error creating bean wit
h name ‘com.cloudera.server.cmf.TrialState‘: Cannot resolve reference to bean ‘e
ntityManagerFactoryBean‘ while setting constructor argument; nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating bean wi
th name ‘entityManagerFactoryBean‘: FactoryBean threw exception on object creati
on; nested exception is javax.persistence.PersistenceException: org.hibernate.ex
ception.GenericJDBCException: Could not open connection
        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.resolve
ConstructorArguments(ConstructorResolver.java:616)
        at org.springframework.beans.factory.support.ConstructorResolver.autowir
eConstructor(ConstructorResolver.java:148)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1003)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:907)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBean(AbstractAutowireCapableBeanFactory.java:456)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getOb
ject(AbstractBeanFactory.java:293)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistr
y.getSingleton(DefaultSingletonBeanRegistry.java:222)

日志的作用是什么？日志的作用是提示，它大部分会给我们明确说遇到了什么问题，比如权限拒绝，等，但是有些你是看不明白的，那我们该如何处理？只能靠你的灵感了，没有灵感怎么办？那就需要自己缕顺序，自己是怎么安装、怎么操作的，然后从中能够发现问题。渐渐的你就能培养出灵感了。