配置： 140.120.63.79 register.nchu.edu.tw FreeBSD 9.0-release 140.120.63.67 elvis.nchu.edu.tw ubuntu 11.10 the below was ubuntu install step: 1. install openssh server: # sudo apt-get install openssh-server 2. vim /etc/hosts 140.120.63.79 register.nchu.edu.tw register 140.120.63.67 elvis.nchu.edu.tw elvis 163.1.17.139 joe 在 FreeBSD 當中也要加入 /etc/hosts 3.安裝 Java # sudo apt-get install sun-java6-jdk # sudo apt-get install sun-java6-plugi 4. adduser: hadooper:turtle 5. login hadooper user ssh-keygen -t dsa cd .ssh cp id_dsa.pub authorized_keys chmod 600 authorized_keys 6. adduser hadooper in FreeBSD ssh -l elvis register sudo adduser hadooper 7. login hadooper in FreeBSD and create public key ssh -l hadooper register // -l username for using to login the username ssh-keygen -t dsa 8. login hadooper in ubuntu and copy public key for all hadooper user cd .ssh ssh regis