一、環境

1.三臺服務器ubuntu14.04， 主機名分別為compute，block1和blcok2

2.兩臺主機hosts文件都為：

二、安裝rsh和rsh-server（三臺主機都安裝），并設置啟動rsh和rlogin服務

1 安裝

apt-get install rsh-client rsh-server xinetd 

2 ubuntu下原來沒有/etc/xinetd.d/rsh文件，新建并添加內容

# default: on # descrīption: The rshd server is the server for the rcmd(3) routine and, / #    consequently, for the rsh(1) program. The server provides / #    remote execution facilities with authentication based on / #    privileged port numbers from trusted hosts. service shell {     disable = no     socket_type       = stream     wait          = no     user          = root     log_on_success     += USERID     log_on_failure     += USERID     server         = /usr/sbin/in.rshd }  /etc/xinetd.d/rlogin  # default: on # descrīption: rlogind is the server for the rlogin(1) program. The server / #    provides a remote login facility with authentication based on / #    privileged port numbers from trusted hosts. service login {     disable = no     socket_type       = stream     wait          = no     user          = root     log_on_success     += USERID     log_on_failure     += USERID     server         = /usr/sbin/in.rlogind }  /etc/xinetd.d/rexec  # default: off # descrīption: Rexecd is the server for the rexec(3) routine. The server / #    provides remote execution facilities with authentication based / #    on user names and passwords. service exec {     disable = no     socket_type       = stream     wait          = no     user          = root     log_on_success     += USERID     log_on_failure     += USERID     server         = /usr/sbin/in.rexecd } 

3 重啟動

root@block2:~# /etc/init.d/xinetd restart xinetd stop/waiting xinetd start/running, process 26181 

三、建立信任文件，實現無密碼訪問配置

1.在root主目錄下建立.rhosts文件，并在此文件內寫入這兩臺主機的主機名

root@block1:~# cat .rhosts  compute root block1 root block2 root 

注：root 驗證需要/root/.rhosts文件，普通用戶需要/etc/hosts.equiv文件

2.在/etc目錄下建立hosts.equiv文件，并在此文件內寫入作為客戶端主機的主機名

root@block1:~# cat /etc/hosts.equiv  # /etc/hosts.equiv: list of hosts and users that are granted "trusted" r #      command access to your system . compute 

3 在文件/etc/securetty中

加入rsh rlogin rexec

四、配置完畢，驗證配置

1.在compute服務器上直接輸入rsh block1 date就可以在block1上無密碼執行date命令

root@compute:~# rsh block2 date Thu Mar 30 16:38:42 CST 2017 

2.在compute上直接輸入rsh block1就可以無密碼登錄block1