edited:-
我在两台不同的机器上完成了单节点集群，我将一台作为主机（192.168.1.1），另一台m/c作为从机（192.168.1.2），我成功地能够在两台机器之间ping，我做了以下更改以进入2节点集群更新：-
/两台计算机上的etc/hosts hosts.allow

All :  Ashish-PC 192.168.1.1 : allow
All  : slave 192.168.1.2 : allow

主文件

Ashish-PC

从属文件

Ashish-PC 
  slave

将本地主机公钥复制到远程主机（从机）：端口22时出错

ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@slave
 /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any    that are already installed
/usr/bin/ssh-copy-id: ERROR: ssh: connect to host slave port 22: Connection timed out

以及当我在主服务启动所有dfs时，然后：-

bin/start-dfs.sh
starting namenode, logging to /usr/local/hadoop/libexec/../logs/hadoop-Ashish-namenode-  Ashish-PC.out
slave: ssh: connect to host slave port 22: Connection timed out
Ashish-PC: starting secondarynamenode, logging to       /usr/local/hadoop/libexec/../logs/hadoop-Ashish-secondarynamenode-Ashish-PC.out
slave: ssh: connect to host slave port 22: Connection timed out

复制时key:-

ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@slave
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: ERROR: ssh: connect to host slave port 22: Connection timed out

我用过cygwin，ssh在这两台电脑上都运行得很好，我也考虑过一些修改端口号22的建议（因为isp的问题），但我不想仅仅因为这个就这么做。提前感谢您的帮助和回复。