[gentoo-user] rsh failed : Connection reset by peer

[gentoo-user] rsh failed : Connection reset by peer

[Chuanwen Wu]

Hi,
I want to use iozone to test my cluster, and I found that iozone need
rsh. But rsh never worked in my machine.

I have followed this guide
http://www.gentoo.org/doc/en/hpc-howto.xml#doc_chap2, which including
the configuration of rsh.

 # eix netkit-rsh
[I] net-misc/netkit-rsh
   Available versions:  0.17-r8 ~0.17-r9 {pam}
   Installed versions:  0.17-r8(08:51:30 10/20/08)(pam)
   Homepage:            ftp://ftp.uk.linux.org/pub/linux/Networking/netkit/
   Description:         Netkit's Remote Shell Suite: rexec{,d}
rlogin{,d} rsh{,d}

# eix xinet
[I] sys-apps/xinetd
    Available versions:  2.3.14 {perl tcpd}
    Installed versions:  2.3.14(09:02:57 PM 01/05/2009)(perl tcpd)
    Homepage:            http://www.xinetd.org/
    Description:         powerful replacement for inetd

# cat /etc/xinetd.d/rsh
service shell
{
      socket_type     = stream
      protocol        = tcp
      wait            = no
      user            = root
      group           = tty
      server          = /usr/sbin/in.rshd
      log_type        = FILE /var/log/rsh
      log_on_success  = PID HOST USERID EXIT DURATION
      log_on_failure  = USERID ATTEMPT
      disable         = no
}

 # cat /etc/xinetd.d/rlogin
service login
{
      socket_type     = stream
      protocol        = tcp
      wait            = no
      user            = root
      group           = tty
      server          = /usr/sbin/in.rlogind
      log_type        = FILE /var/log/rlogin
      log_on_success  = PID HOST USERID EXIT DURATION
      log_on_failure  = USERID ATTEMPT
      disable         = no
}

I have a node07 whose is is 192.168.1.7 and a master, whose ip is 192.168.1.1.
I tried to rlogin to master from node73 with any user (i mean both
root and other users), I got the error in node07:
node07 # rlogin -l root master
rcmd: master: Connection reset by peer

and I read the log from /var/log/rlogin in master:
# cat /var/log/rsh
[...]
09/1/5@23:10:36: FAIL: login address
09/1/5@23:10:36: START: login pid=8961 from=192.168.1.7
09/1/5@23:10:36: EXIT: login status=0 pid=8961 duration=0(sec)

And the master can't rlogin to itself, too: with root, because t:
master # rlogin -l root localhost
Password:
Password:
Login incorrect
 /*rlogin with root,  the password is incorrect forever and Of course,
I am sure the password is correct */

master # rlogin -l wcw localhost
Password:
Last login: Mon Jan  5 23:23:06 CST 2009 from localhost on pts/8
rlogin: connection closed.
/*rlogin with other user(wcw), it will succeed, but the connection
will closed immediately  */

# cat /var/log/rsh
[...]
09/1/5@23:20:09: START: login pid=10227 from=127.0.0.1
09/1/5@23:21:17: EXIT: login status=0 pid=10227 duration=68(sec)
09/1/5@23:22:13: START: login pid=10954 from=127.0.0.1
09/1/5@23:22:15: EXIT: login status=0 pid=10954 duration=2(sec)

# cat /etc/hosts.allow
ALL:192.168.1.0/255.255.255.0

# cat /etc/hosts.equiv
master
node07

Anybody can help?
Thanks in advanced!

--
wcw

[gentoo-user] Re: rsh failed : Connection reset by peer

[Chuanwen Wu]

I think I have fixed part of the problem, I found this option
"only_from	= localhost" in file /etc/xinetd.conf, and mask it.
And now I can rlogin into localhost or remotehost:
node07 # rlogin master
Password:
Last login: Tue Jan  6 20:40:36 CST 2009 from node07 on pts/4
rlogin: connection closed.

master # rlogin localhost
Password:
Last login: Tue Jan  6 20:56:42 CST 2009 from node07 on pts/8
rlogin: connection closed.

But as you can see, after login successfully, the connection is closed
immediately. I dont' know whether it's normal or not, as I never used
rsh before.

And now, although rlogin can be use, but rsh still don't work:



-- 
wcw

[gentoo-user] Re: rsh failed : Connection reset by peer

[Chuanwen Wu]

I am very sorry for the last e-mail, as I intented to save the email
but clicked the "send" button.
I will continue the last letter below.
On Tue, Jan 6, 2009 at 9:08 PM, Chuanwen Wu <wcw8410@gmail.com> wrote:
> I think I have fixed part of the problem, I found this option
> "only_from      = localhost" in file /etc/xinetd.conf, and mask it.
> And now I can rlogin into localhost or remotehost:
> node07 # rlogin master
> Password:
> Last login: Tue Jan  6 20:40:36 CST 2009 from node07 on pts/4
> rlogin: connection closed.
>
> master # rlogin localhost
> Password:
> Last login: Tue Jan  6 20:56:42 CST 2009 from node07 on pts/8
> rlogin: connection closed.
>
> But as you can see, after login successfully, the connection is closed
> immediately. I dont' know whether it's normal or not, as I never used
> rsh before.
>
> And now, although rlogin can be use, but rsh still don't work:
/*rsh into remotehost*/
node07 # rsh -l wcw master pwd
assword: aaaa
^C

/* rsh into localhost */
master # rsh localhost pwd
assword: aaaaa
^C
It's very weird as you can see above, after I entered the rsh command,
the "assword" but not "password" appleared. The "aaaa" is the
characters I typed.

Any help will be very appreciated!
-- 
wcw

[gentoo-user] Re: rsh failed : Connection reset by peer

[Chuanwen Wu]

I guessed it is the pam problem, and I re-installed netkit-rsh with
USE=-pam, now I can use rsh with common users, but root still not
work:

# rsh -l wcw master date
Tue Jan  6 23:33:35 CST 2009

# rsh -l root master date
Permission denied.

Everytime when I tried to use root to login, I got the error
"Permission denied."

master # cat /root/.rhosts
node07 root
node07 wcw

master # ls -l /root/.rhosts
-rw------- 1 root root 33 Jan  6 23:31 /root/.rhosts

I guess maybe rsh does not allow to login as root. So anyway to solved
this problem?

Thanks!
-- 
wcw

Re: [gentoo-user] Re: rsh failed : Connection reset by peer

[Matt Harrison]

Chuanwen Wu wrote:
> I guess maybe rsh does not allow to login as root.

Probably not, RSH was abandoned years ago and I'm surprised there are 
any applications still around that haven't moved to ssh.

Exposing the root user to an already unsafe transmission is asking for 
trouble IMHO.

Unfortunately I can't help with the configuration but I thought a brief 
warning should accompany any discussion on RSH.

Matt

Re: [gentoo-user] Re: rsh failed : Connection reset by peer

[Peter Humphrey]

On Thursday 08 January 2009 04:51:27 Matt Harrison wrote:

> RSH was abandoned years ago and I'm surprised there are any applications
> still around that haven't moved to ssh. 

$ equery l rsh
[ Searching for package 'rsh' in all categories among: ]
 * installed packages
[I--] [  ] net-misc/netkit-rsh-0.17-r9 (0)

$ equery d netkit-rsh
[ Searching for packages depending on netkit-rsh... ]
x11-apps/xsm-1.0.1 (net-misc/netkit-rsh)

$ equery d xsm
[ Searching for packages depending on xsm... ]
x11-apps/xinit-1.0.5-r1 (!minimal? x11-apps/xsm)

$ equery d xinit
[ Searching for packages depending on xinit... ]
kde-base/kdm-3.5.9 (x11-apps/xinit)
x11-base/xorg-server-1.3.0.0-r6 (x11-apps/xinit)
x11-base/xorg-x11-7.2 (>=x11-apps/xinit-1.0.3)

In other words, you can't have X without rsh (other than a minimal X 
installation, perhaps).

I was surprised too.

-- 
Rgds
Peter

Re: [gentoo-user] Re: rsh failed : Connection reset by peer

[Eric Martin]

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Matt Harrison wrote:
> Chuanwen Wu wrote:
>> I guess maybe rsh does not allow to login as root.
>
> Probably not, RSH was abandoned years ago and I'm surprised there are
> any applications still around that haven't moved to ssh.
>
> Exposing the root user to an already unsafe transmission is asking for
> trouble IMHO.
>
> Unfortunately I can't help with the configuration but I thought a
> brief warning should accompany any discussion on RSH.
>
> Matt
>
>
Doesn't ssh work as a drop in replacement for rsh?  Try ssh instead.  I
know in cvs, there's an environment variable CVS_RSH that you set to ssh
and everything works fine. 


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Re: [gentoo-user] Re: rsh failed : Connection reset by peer

[Chuanwen Wu]

Hi, thank all you guys!
I give up rsh and trying using ssh now.  I stiil find some problem and
have started a new thread.
On Thu, Jan 8, 2009 at 12:51 PM, Matt Harrison
<iwasinnamuknow@genestate.com> wrote:
> Chuanwen Wu wrote:
>>
>> I guess maybe rsh does not allow to login as root.
>
> Probably not, RSH was abandoned years ago and I'm surprised there are any
> applications still around that haven't moved to ssh.
>
> Exposing the root user to an already unsafe transmission is asking for
> trouble IMHO.
>
> Unfortunately I can't help with the configuration but I thought a brief
> warning should accompany any discussion on RSH.
>
> Matt
>
>
>



-- 
wcw