rsh rlogin 无密码登录

CentOS5中实现双机rlogin、rsh无密码通信的一个方法

===========================================================

作者: cnhtm(http://cnhtm.itpub.net)
发表于:2010.01.13 09:23
分类: 一般分类
出处：http://cnhtm.itpub.net/post/39970/495882
---------------------------------------------------------------

在安装RAC的时候，需要配置各个节点的互信关系，使rsh、rlogin、rcp等命令不需要输入密码可以操作其他节点。
除了按照管法rac安装文档中的方法配置ssh之外，还可以通过修改.rhosts等文件实现互信。
在unix（如aix）中，可以简单修改/etc/hosts.equiv实现，但是Linux中比较麻烦，需要一些其他的步骤，下面演示配置方法

需要在各个节点上完成如下操作

1、检查rsh-server包是否已经安装

[root@rac1 ~]# rpm -qa|grep -i ^rsh-server
rsh-server-0.17-40.el5

如果没有安装使用rpm -ivh 命令安装

2、确保/etc/xinetd.d/rlogin中存在disable = no这一行（红色部分）

[root@rac1 ~]# cat /etc/xinetd.d/rlogin
# default: on
# description: 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
}

3、确保/etc/xinetd.d/rsh中存在disable = no这一行（红色部分）

[root@rac1 ~]# cat /etc/xinetd.d/rsh
# default: on
# description: 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
}

4、重启xinetd服务

[root@rac1 ~]# service xinetd restart
Stopping xinetd: [ OK ]
Starting xinetd: [ OK ]

5、编辑/etc/securetty，确保存在rexec、rsh、rlogin三行（红色部分）

[root@rac1 ~]# cat /etc/securetty
console
vc/1
vc/2
vc/3
vc/4
vc/5
vc/6
vc/7
vc/8
vc/9
vc/10
vc/11
tty1
tty2
tty3
tty4
tty5
tty6
tty7
tty8
tty9
tty10
tty11
rexec
rsh
rlogin

6、编辑/etc/hosts.equiv文件，如下所示

[root@rac1 ~]# cat /etc/hosts.equiv
+rac1 oracle
+rac2 oracle
+rac1-priv oracle
+rac2-priv oracle
+rac1 root
+rac2 root
+rac1-priv root
+rac2-priv root

7、编辑/etc/hosts文件，如下所示

[root@rac1 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

#public
192.168.2.101 rac1.localdomain rac1
192.168.2.102 rac2.localdomain rac2

#private
192.168.0.101 rac1-priv.localdomain rac1-priv
192.168.0.102 rac2-priv.localdomain rac2-priv

#virtual
192.168.2.111 rac1-vip.localdomain rac1-vip
192.168.2.112 rac2-vip.localdomain rac2-vip

8、编辑~/.rhosts，如下所示

[root@rac1 ~]# cat ~/.rhosts
+rac1 root
+rac2 root
+rac1-priv root
+rac2-priv root

9、测试rlogin和rsh是否可以不用输入密码登录其他节点

[root@rac1 ~]# rlogin rac2
connect to address 192.168.2.102 port 543: Connection refused
Trying krb4 rlogin...
connect to address 192.168.2.102 port 543: Connection refused
trying normal rlogin (/usr/bin/rlogin)
Last login: Wed Jan 13 08:39:17 from rac1
[root@rac2 ~]# hostname
rac2.localdomain
[root@rac2 ~]# exit
logout
rlogin: connection closed.
[root@rac1 ~]# rsh rac2
connect to address 192.168.2.102 port 543: Connection refused
Trying krb4 rlogin...
connect to address 192.168.2.102 port 543: Connection refused
trying normal rlogin (/usr/bin/rlogin)
Last login: Wed Jan 13 08:47:22 from rac1
[root@rac2 ~]# hostname
rac2.localdomain
[root@rac2 ~]# exit
logout
rlogin: connection closed.

--end--