運行Hadoop start-all.sh遇到的錯誤ssh: connect to host localhost port 22: Connection refused

ssh: connect to host localhost port 22: Connection refused
我的情況是ssh server沒裝，查看方法：

ps -e |grep ssh

如果沒有sshd，說明還沒有安裝ssh server

解決方案：

sudo apt-get install openssh-server

之後運行start-all.sh就成功了
執行jps結果：

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