Hadoop采用伪分布式模式.拒绝连接

Question

PS:请不要将此标记为重复

嗨,

我一直在尝试在伪分布式模式下设置和运行Hadoop.当我运行start-all.sh脚本时,我得到了这个输出:

starting namenode, logging to /home/raveesh/Hadoop/hadoop-0.20.2/bin/../logs/..
localhost: ssh: connect to host localhost port 22: Connection refused
localhost: ssh: connect to host localhost port 22: Connection refused
starting jobtracker, logging to /home/raveesh/Hadoop/hadoop-0.20.2/bin/../logs/..
localhost: ssh: connect to host localhost port 22: Connection refused
raveesh@raveeshL:~/Hadoop/hadoop-0.20.2/bin$ 

这就是我所做的.我使用以下命令安装了open-ssh服务器和客户端:

sudo apt-get install openssh-server openssh-client

我已经启动了ssh服务器

sudo service ssh start

我得到的输出为:

ssh start/running, process 5466

我还运行了以下命令:

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa

cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

但是当我运行start-all脚本时,它仍然显示连接被拒绝.我也尝试了这里提到的技巧,但我无法让它工作.我在防火墙后面,我正在使用Ubuntu.有什么东西我错过了吗？

任何帮助都非常感谢.

谢谢.

Answer 1

安装 ssh 后，还应该启用无密码登录。

% ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
% cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys