运行Hadoop start-all.sh遇到的错误ssh: connect to host localhost port 22: Connection refused

ssh: connect to host localhost port 22: Connection refused 
我的情况是ssh server没装，查看方法：

ps -e |grep ssh

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如果没有sshd，说明还没有安装ssh server

解决方案：

sudo apt-get install openssh-server

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之后运行start-all.sh就成功了 
执行jps结果：

yufeng@yufeng-pc:~/hadoop/hadoop-1.2.1/bin$ jps
Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp
5328 NameNode
5491 JobTracker
9636 Jps
9244 DataNode
9549 TaskTracker
9391 SecondaryNameNode