一、环境

1.三台服务器ubuntu14.04， 主机名分别为compute，block1和blcok2

2.两台主机hosts文件都为：
root@compute:~# cat /etc/hosts
127.0.0.1 localhost
192.168.4.132 compute
192.168.4.133 block1
192.168.4.134 block2

二、安装rsh和rsh-server（三台主机都安装），并设置启动rsh和rlogin服务

1 安装 

apt-get install rsh-client rsh-server xinetd

2 ubuntu下原来没有/etc/xinetd.d/rsh文件，新建并添加内容 

# 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 重启动 

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

三、建立信任文件，实现无密码访问配置

1.在root主目录下建立.rhosts文件，并在此文件内写入这两台主机的主机名 

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

注：root 验证需要/root/.rhosts文件，普通用户需要/etc/hosts.equiv文件

2.在/etc目录下建立hosts.equiv文件，并在此文件内写入作为客户端主机的主机名 

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、配置完毕，验证配置

1.在compute服务器上直接输入rsh block1 date就可以在block1上无密码执行date命令 

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

2.在compute上直接输入rsh block1就可以无密码登录block1
3.普通用户操作同root用户
4.还有rcp命令可以远程复制文件
至此rsh无密码访问配置完毕。

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