DRb connection issues

ruby-talk
1

This is not a DRb problem, so much as a system configuration problem. I know
this already, but I can't figure out why DRb will not connect. I have two
machines, plugged into a switch, and both have static IPs. I have had DRb
talking just fine before, but only for a while, so I'm not sure why it won't
talk now, and I thought I had already solved the problem by placing the
whatever.fylz.com before localhost.localdomain in the /etc/hosts files. I
have not rebooted either machine (but it was overnight), so I do not know now
why they DRb will not talk.

The problem seems to be name resolution, so I'm playing around with /etc/hosts
to see if I can get us to talk.

I'm using the dchats.rb and dchatc.rb included with the DRb examples. I start
the server on one machine (called costarica) and see this:

kevin@costarica:~/drbsample$ ruby dchats.rb
druby://costarica.fylz.com:1242
[return] to exit.

I start the client on the other machine (called nicaragua) and see this:

kevin@nicaragua:~/ruby/drb$ ruby dchatc.rb druby://costarica.fylz.com:1242
kevin
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:733:in `open':
druby://nicaragua.fylz.com:39879 - #<Errno::ECONNREFUSED: Connection refused
- connect(2)> (DRb::DRbConnError)
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:726:in `each'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:726:in `open'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1185:in
`initialize'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `new'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `open'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1082:in
`method_missing'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`with_friend'
        from
(druby://costarica.fylz.com:1242) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`method_missing'
        from (druby://costarica.fylz.com:1242) dchats.rb:14:in `initialize'
        from (druby://costarica.fylz.com:1242) dchats.rb:37:in `new'
        from (druby://costarica.fylz.com:1242) dchats.rb:37:in `add_member'
        from dchatc.rb:37

I can ping both machines by name from each other just fine:
kevin@nicaragua:~/ruby/drb$ ping costarica
PING costarica.fylz.com (192.168.2.105) 56(84) bytes of data.
64 bytes from costarica.fylz.com (192.168.2.105): icmp_seq=1 ttl=64 time=0.226
ms

kevin@costarica:~/drbsample$ ping nicaragua
PING nicaragua.fylz.com (192.168.2.102) 56(84) bytes of data.
64 bytes from nicaragua.fylz.com (192.168.2.102): icmp_seq=1 ttl=64 time=0.206
ms

Both know their host name:
kevin@nicaragua:~/ruby/drb$ hostname
nicaragua.fylz.com

kevin@costarica:~/drbsample$ hostname
costarica.fylz.com

And here are the contents of both of their /etc/hosts files:

kevin@nicaragua:~/ruby/drb$ cat /etc/hosts
127.0.0.1 nicaragua.fylz.com localhost.localdomain localhost
nicaragua
198.186.207.1 router
198.186.207.11 myradio
198.186.207.2 fylradio
192.168.0.1 vsat
192.168.2.103 dualie

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

kevin@costarica:~/drbsample$ cat /etc/hosts
127.0.0.1 costarica.fylz.com localhost.localdomain localhost
costarica

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

The server (costarica) is running Debian Sarge and the client is on Kubuntu
Hoary. Does anyone have any idea why I see the above error? I certainly
don't.

2

kevin@costarica:~/drbsample$ ruby dchats.rb
druby://costarica.fylz.com:1242

           ^^^^^^^^^^^^^^^^^^

[return] to exit.

I start the client on the other machine (called nicaragua) and see this:

kevin@nicaragua:~/ruby/drb$ ruby dchatc.rb druby://costarica.fylz.com:1242
kevin

I can ping both machines by name from each other just fine:
kevin@nicaragua:~/ruby/drb$ ping costarica

                                    ^^^^^^^^^

PING costarica.fylz.com (192.168.2.105) 56(84) bytes of data.
64 bytes from costarica.fylz.com (192.168.2.105): icmp_seq=1 ttl=64 time=0.226
ms

kevin@costarica:~/drbsample$ ping nicaragua

                                     ^^^^^^^^^

PING nicaragua.fylz.com (192.168.2.102) 56(84) bytes of data.
64 bytes from nicaragua.fylz.com (192.168.2.102): icmp_seq=1 ttl=64 time=0.206
ms

Your ping host names and druby URI host names do not match. Try ping with the full host name.

Both know their host name:
kevin@nicaragua:~/ruby/drb$ hostname
nicaragua.fylz.com

kevin@costarica:~/drbsample$ hostname
costarica.fylz.com

On each machine try:
$ ruby -rsocket -e 'p Socket.gethostname'
"kaa.coop.robotcoop.com
$ ruby -rsocket -e 'p Socket.gethostbyname("kaa.coop.robotcoop.com")'
["kaa.coop.robotcoop.com", , 2, "\300\250\001F"]
$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\001F")'
["kaa.coop.robotcoop.com", , 2, "\300\250\001F"]
$ ruby -rsocket -e 'p Socket.gethostbyname("rur-1.coop.robotcoop.com")'
["rur-1.coop.robotcoop.com", , 2, "\300\250\001\v"]
$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\001\v")'
["rur-1.coop.robotcoop.com", , 2, "\300\250\001\v"]

Where 'kaa.coop.robotcoop.com' is the local machine and 'rur-1.coop.robotcoop.com' is the remote machine.

Line 1 should match `hostname`
Lines 2 and 3 should be identical
Lines 4 and 5 should be identical

In lines 2 through 5 the last item should not match:
"\177\000\000\001"

Note:

"\177\000\000\001".scan(/./).map { |c| c[0] }.join '.'
=> "127.0.0.1"

And here are the contents of both of their /etc/hosts files:

kevin@nicaragua:~/ruby/drb$ cat /etc/hosts

I would set up DNS instead of relying on hosts files, I've found hosts files fragile.

···

On Dec 7, 2005, at 1:09 PM, Kevin Brown wrote:

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

3

Thanks for the reply!

[...]
Your ping host names and druby URI host names do not match. Try ping
with the full host name.

kevin@nicaragua:~$ ping costarica.fylz.com
PING costarica.fylz.com (192.168.2.105) 56(84) bytes of data.
64 bytes from costarica.fylz.com (192.168.2.105): icmp_seq=1 ttl=64 time=0.317
ms

kevin@costarica:~$ ping nicaragua.fylz.com
PING nicaragua.fylz.com (192.168.2.102) 56(84) bytes of data.
64 bytes from nicaragua.fylz.com (192.168.2.102): icmp_seq=1 ttl=64 time=0.183
ms

On each machine try:
$ ruby -rsocket -e 'p Socket.gethostname'
"kaa.coop.robotcoop.com
$ ruby -rsocket -e 'p Socket.gethostbyname("kaa.coop.robotcoop.com")'
["kaa.coop.robotcoop.com", , 2, "\300\250\001F"]
$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\001F")'
["kaa.coop.robotcoop.com", , 2, "\300\250\001F"]
$ ruby -rsocket -e 'p Socket.gethostbyname("rur-1.coop.robotcoop.com")'
["rur-1.coop.robotcoop.com", , 2, "\300\250\001\v"]
$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\001\v")'
["rur-1.coop.robotcoop.com", , 2, "\300\250\001\v"]

Where 'kaa.coop.robotcoop.com' is the local machine and
'rur-1.coop.robotcoop.com' is the remote machine.

== Server ==
kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostname'
"costarica.fylz.com"

kevin@costarica:~$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["localhost.localdomain", "localhost", "costarica",
"costarica"], 2, "\177\000\000\001", "\300\250\002i"]

kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@costarica:~$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

== Client ==
kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostname'
"nicaragua.fylz.com"

kevin@nicaragua:~$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["localhost.localdomain", "localhost", "nicaragua",
"nicaragua"], 2, "\177\000\000\001", "\300\250\002f"]

kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@nicaragua:~$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

Line 1 should match `hostname`

It does.

Lines 2 and 3 should be identical

They're obviously not. So what do I change to get them to be?

Lines 4 and 5 should be identical

They are.

In lines 2 through 5 the last item should not match:
"\177\000\000\001"

It's not the last item, but is there.

And just to make sure that it's still happening, I tried running the dchats
and dchatc programs again and got the same error.

Note:

"\177\000\000\001".scan(/./).map { |c| c[0] }.join '.'
=> "127.0.0.1"

Makes sense.

···

On Wednesday 07 December 2005 18:13, Eric Hodel wrote:

> And here are the contents of both of their /etc/hosts files:
>
> kevin@nicaragua:~/ruby/drb$ cat /etc/hosts

I would set up DNS instead of relying on hosts files, I've found
hosts files fragile.

4

Maybe try:

127.0.0.1 localhost.localdomain localhost
192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

in your /etc/hosts.

···

On Dec 8, 2005, at 7:51 AM, Kevin Brown wrote:

On Wednesday 07 December 2005 18:13, Eric Hodel wrote:

[...]
Your ping host names and druby URI host names do not match. Try ping
with the full host name.

== Server ==
kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostname'
"costarica.fylz.com"

kevin@costarica:~$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["localhost.localdomain", "localhost", "costarica",
"costarica"], 2, "\177\000\000\001", "\300\250\002i"]

kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@costarica:~$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

== Client ==
kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostname'
"nicaragua.fylz.com"

kevin@nicaragua:~$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["localhost.localdomain", "localhost", "nicaragua",
"nicaragua"], 2, "\177\000\000\001", "\300\250\002f"]

kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@nicaragua:~$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

Line 1 should match `hostname`

It does.

Lines 2 and 3 should be identical

They're obviously not. So what do I change to get them to be?

Lines 4 and 5 should be identical

They are.

In lines 2 through 5 the last item should not match:
"\177\000\000\001"

It's not the last item, but is there.

And here are the contents of both of their /etc/hosts files:

kevin@nicaragua:~/ruby/drb$ cat /etc/hosts
127.0.0.1 nicaragua.fylz.com localhost.localdomain localhost
nicaragua

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

5

--just curious, what do you get when running this command:

root# hostname --fqdn

Thx

···

On 12/8/05, Eric Hodel <drbrain@segment7.net> wrote:

On Dec 8, 2005, at 7:51 AM, Kevin Brown wrote:

> On Wednesday 07 December 2005 18:13, Eric Hodel wrote:
>> [...]
>> Your ping host names and druby URI host names do not match. Try ping
>> with the full host name.
>
> == Server ==
> kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostname'
> "costarica.fylz.com"
>
> kevin@costarica:~$ ruby -rsocket -e 'p
> Socket.gethostbyname("costarica.fylz.com")'
> ["costarica.fylz.com", ["localhost.localdomain", "localhost",
> "costarica",
> "costarica"], 2, "\177\000\000\001", "\300\250\002i"]
>
> kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> \250\002i")'
> ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
>
> kevin@costarica:~$ ruby -rsocket -e 'p
> Socket.gethostbyname("nicaragua.fylz.com")'
> ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
>
> kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> \250\002f")'
> ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
>
> == Client ==
> kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostname'
> "nicaragua.fylz.com"
>
> kevin@nicaragua:~$ ruby -rsocket -e 'p
> Socket.gethostbyname("nicaragua.fylz.com")'
> ["nicaragua.fylz.com", ["localhost.localdomain", "localhost",
> "nicaragua",
> "nicaragua"], 2, "\177\000\000\001", "\300\250\002f"]
>
> kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> \250\002f")'
> ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
>
> kevin@nicaragua:~$ ruby -rsocket -e 'p
> Socket.gethostbyname("costarica.fylz.com")'
> ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
>
> kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> \250\002i")'
> ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
>
>
>> Line 1 should match `hostname`
>
> It does.
>
>> Lines 2 and 3 should be identical
>
> They're obviously not. So what do I change to get them to be?
>
>> Lines 4 and 5 should be identical
>
> They are.
>
>> In lines 2 through 5 the last item should not match:
>> "\177\000\000\001"
>
> It's not the last item, but is there.

>>> And here are the contents of both of their /etc/hosts files:
>>>
>>> kevin@nicaragua:~/ruby/drb$ cat /etc/hosts
>>> 127.0.0.1 nicaragua.fylz.com localhost.localdomain
>>> localhost
>>> nicaragua

Maybe try:

127.0.0.1 localhost.localdomain localhost
192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

in your /etc/hosts.

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

6

That is exactly the content of both /etc/hosts files (with some ipv6 stuff and
a few other machines).

== Server ==
kevin@costarica:~/drbsample$ ruby dchats.rb
druby://costarica.fylz.com:1255
[return] to exit.

== Client ==
kevin@nicaragua:~/ruby/drb$ ruby dchatc.rb druby://costarica.fylz.com:1255
kevin
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:733:in `open':
druby://nicaragua.fylz.com:34220 - #<Errno::ECONNREFUSED: Connection refused
- connect(2)> (DRb::DRbConnError)
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:726:in `each'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:726:in `open'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1185:in
`initialize'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `new'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `open'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1082:in
`method_missing'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`with_friend'
        from
(druby://costarica.fylz.com:1255) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`method_missing'
        from (druby://costarica.fylz.com:1255) dchats.rb:14:in `initialize'
        from (druby://costarica.fylz.com:1255) dchats.rb:37:in `new'
        from (druby://costarica.fylz.com:1255) dchats.rb:37:in `add_member'
        from dchatc.rb:37

This is why I was whining so heavily a month or so ago. I can connect to the
postgres server on this machine with no problems.... Is there any reason
that DRb needs to use hostnames?

Anyway, now with the /etc/hosts modifications, here's the same 5 commands on
both:

== Server ==
kevin@costarica:~/drbsample$ ruby -rsocket -e 'p Socket.gethostname'
"costarica.fylz.com"

kevin@costarica:~/drbsample$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@costarica:~/drbsample$ ruby -rsocket -e 'p
Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@costarica:~/drbsample$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@costarica:~/drbsample$ ruby -rsocket -e 'p
Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

== Client ==
kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p Socket.gethostname'
"nicaragua"

kevin@nicaragua:~/ruby/drb$ cat /etc/hosts
127.0.0.1 localhost.localdomain localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

kevin@nicaragua:~/ruby/drb$ hostname
nicaragua
kevin@nicaragua:~/ruby/drb$ sudo hostname nicaragua.fylz.com
Password:
kevin@nicaragua:~/ruby/drb$ hostname
nicaragua.fylz.com
kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p Socket.gethostname'
"nicaragua.fylz.com"

So.....what the heck here....?

kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p
Socket.gethostbyname("nicaragua.fylz.com")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p
Socket.gethostbyaddr("\300\250\002f")'
["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]

kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p
Socket.gethostbyname("costarica.fylz.com")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

kevin@nicaragua:~/ruby/drb$ ruby -rsocket -e 'p
Socket.gethostbyaddr("\300\250\002i")'
["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]

But still...
kevin@costarica:~/drbsample$ ruby dchats.rb
druby://costarica.fylz.com:1257
[return] to exit.

(By the way, while that's running)
kevin@costarica:~$ netstat -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:8000 *:* LISTEN
tcp 0 0 *:1257 *:* LISTEN

And I obviously talk:
kevin@nicaragua:~$ telnet costarica.fylz.com 1257
Trying 192.168.2.105...
Connected to costarica.fylz.com.
Escape character is '^]'.
asdf
o:DRb::DRbConnError:bt["//usr/lib/ruby/1.8/drb/drb.rb:570:in
`load'"7/usr/lib/ruby/1.8/drb/drb.rb:609:in
`recv_request'"7/usr/lib/ruby/1.8/drb/drb.rb:908:in
`recv_request'"</usr/lib/ruby/1.8/drb/drb.rb:1527:in
`init_with_client'"9/usr/lib/ruby/1.8/drb/drb.rb:1539:in
`setup_message'"3/usr/lib/ruby/1.8/drb/drb.rb:1491:in
`perform'"5/usr/lib/ruby/1.8/drb/drb.rb:1586:in
`main_loop'"0/usr/lib/ruby/1.8/drb/drb.rb:1582:in
`loop'"5/usr/lib/ruby/1.8/drb/drb.rb:1582:in
`main_loop'"1/usr/lib/ruby/1.8/drb/drb.rb:1578:in
`start'"5/usr/lib/ruby/1.8/drb/drb.rb:1578:in
`main_loop'"//usr/lib/ruby/1.8/drb/drb.rb:1426:in
`run'"1/usr/lib/ruby/1.8/drb/drb.rb:1423:in
`start'"//usr/lib/ruby/1.8/drb/drb.rb:1423:in
`run'"6/usr/lib/ruby/1.8/drb/drb.rb:1343:in
`initialize'"//usr/lib/ruby/1.8/drb/drb.rb:1624:in
`new'"9/usr/lib/ruby/1.8/drb/drb.rb:1624:in `start_service'"dchats.rb:67:
mesg" too large packet 1634952294Connection closed by foreign host.

But:
kevin@nicaragua:~/ruby/drb$ ruby dchatc.rb druby://costarica.fylz.com:1257
kevin
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:733:in `open':
druby://nicaragua.fylz.com:34246 - #<Errno::ECONNREFUSED: Connection refused
- connect(2)> (DRb::DRbConnError)
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:726:in `each'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:726:in `open'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1185:in
`initialize'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `new'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1165:in `open'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1082:in
`method_missing'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`with_friend'
        from
(druby://costarica.fylz.com:1257) /usr/lib/ruby/1.8/drb/drb.rb:1081:in
`method_missing'
        from (druby://costarica.fylz.com:1257) dchats.rb:14:in `initialize'
        from (druby://costarica.fylz.com:1257) dchats.rb:37:in `new'
        from (druby://costarica.fylz.com:1257) dchats.rb:37:in `add_member'
        from dchatc.rb:37

I'm at a loss.

···

On Thursday 08 December 2005 19:42, Eric Hodel wrote:

On Dec 8, 2005, at 7:51 AM, Kevin Brown wrote:
> On Wednesday 07 December 2005 18:13, Eric Hodel wrote:
>> [...]
Maybe try:

127.0.0.1 localhost.localdomain localhost
192.168.2.105 costarica.fylz.com costarica
192.168.2.102 nicaragua.fylz.com nicaragua

in your /etc/hosts.

7

--just curious, what do you get when running this command:

root# hostname --fqdn

This is before the modifications that Eric so kindly gave that I will try
next. :slight_smile:

root@nicaragua:/home/kevin # hostname --fqdn
nicaragua.fylz.com

costarica:/home/kevin# hostname --fqdn
costarica.fylz.com

Looks kosher, no?

···

On Thursday 08 December 2005 20:10, x1 wrote:

Thx

On 12/8/05, Eric Hodel <drbrain@segment7.net> wrote:
> On Dec 8, 2005, at 7:51 AM, Kevin Brown wrote:
> > On Wednesday 07 December 2005 18:13, Eric Hodel wrote:
> >> [...]
> >> Your ping host names and druby URI host names do not match. Try ping
> >> with the full host name.
> >
> > == Server ==
> > kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostname'
> > "costarica.fylz.com"
> >
> > kevin@costarica:~$ ruby -rsocket -e 'p
> > Socket.gethostbyname("costarica.fylz.com")'
> > ["costarica.fylz.com", ["localhost.localdomain", "localhost",
> > "costarica",
> > "costarica"], 2, "\177\000\000\001", "\300\250\002i"]
> >
> > kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> > \250\002i")'
> > ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
> >
> > kevin@costarica:~$ ruby -rsocket -e 'p
> > Socket.gethostbyname("nicaragua.fylz.com")'
> > ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
> >
> > kevin@costarica:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> > \250\002f")'
> > ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
> >
> > == Client ==
> > kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostname'
> > "nicaragua.fylz.com"
> >
> > kevin@nicaragua:~$ ruby -rsocket -e 'p
> > Socket.gethostbyname("nicaragua.fylz.com")'
> > ["nicaragua.fylz.com", ["localhost.localdomain", "localhost",
> > "nicaragua",
> > "nicaragua"], 2, "\177\000\000\001", "\300\250\002f"]
> >
> > kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> > \250\002f")'
> > ["nicaragua.fylz.com", ["nicaragua"], 2, "\300\250\002f"]
> >
> > kevin@nicaragua:~$ ruby -rsocket -e 'p
> > Socket.gethostbyname("costarica.fylz.com")'
> > ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
> >
> > kevin@nicaragua:~$ ruby -rsocket -e 'p Socket.gethostbyaddr("\300
> > \250\002i")'
> > ["costarica.fylz.com", ["costarica"], 2, "\300\250\002i"]
> >
> >> Line 1 should match `hostname`
> >
> > It does.
> >
> >> Lines 2 and 3 should be identical
> >
> > They're obviously not. So what do I change to get them to be?
> >
> >> Lines 4 and 5 should be identical
> >
> > They are.
> >
> >> In lines 2 through 5 the last item should not match:
> >> "\177\000\000\001"
> >
> > It's not the last item, but is there.
> >
> >>> And here are the contents of both of their /etc/hosts files:
> >>>
> >>> kevin@nicaragua:~/ruby/drb$ cat /etc/hosts
> >>> 127.0.0.1 nicaragua.fylz.com localhost.localdomain
> >>> localhost
> >>> nicaragua
>
> Maybe try:
>
> 127.0.0.1 localhost.localdomain localhost
> 192.168.2.105 costarica.fylz.com costarica
> 192.168.2.102 nicaragua.fylz.com nicaragua
>
> in your /etc/hosts.
>
> --
> Eric Hodel - drbrain@segment7.net - http://segment7.net
> This implementation is HODEL-HASH-9600 compliant
>
> http://trackmap.robotcoop.com

8

Ok, for others following this thread, the problem was Firestarter. I had a
specific rule to allow connections from all machines involved, and
firestarter is only on one side. Going the other way with telnet, and trying
to run the server on the other machine, connections would time out. I
figured this was strange as Firestarter (if it was the problem) was supposed
to send error packets as I had it configured.

And when firestarter started this particular time, it gave a funky error
message. So restarting the machine (bringing firestarter up again) caused
the settings to be correctly applied, and voila, happy drb.

···

On Thursday 08 December 2005 20:10, x1 wrote:

--just curious, what do you get when running this command:

root# hostname --fqdn

-_-