Ubuntu14.04启动hadoop服务报错

Question

root@ubuntu:/opt/hadoop-1.2.1/bin# start-all.sh
Warning: $HADOOP_HOME is deprecated.

starting namenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-namenode-ubuntu.out
localhost: ssh: connect to host localhost port 22: Connection refused
localhost: ssh: connect to host localhost port 22: Connection refused
starting jobtracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-jobtracker-ubuntu.out
localhost: ssh: connect to host localhost port 22: Connection refused

只有namenode启动成功：

root@ubuntu:/opt/hadoop-1.2.1/bin# jps
2432 NameNode
2694 Jps

有没有聪明的同学知道原因！

Answer 1

日志的提示很清楚，连接被拒绝，你的ssh没有弄好，亦或是有什么程序占用了ssh默认的22端口