[rabbitmq-discuss] Plz give me help about EPMD: Non-local peer connected
何斌
hebin7611 at hotmail.com
Mon Jul 9 10:27:26 BST 2012
Hi,
[root at game-01 woyogame]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 game-01 ZSWY76 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
[root at game-01 woyogame]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=game-01
GATEWAY=183.*.*.*
It seems OK.
He Bin
Date: Mon, 9 Jul 2012 10:17:54 +0100
From: tim at rabbitmq.com
To: rabbitmq-discuss at lists.rabbitmq.com
CC: hebin7611 at hotmail.com
Subject: Re: [rabbitmq-discuss] Plz give me help about EPMD: Non-local peer connected
Ah ok great. I'm on CentOS 6, and I found that setting up the
hostname so that Erlang was *happy* with it took a bit of fiddling
around.
My configuration looks like this:
t4 at iske $ cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
127.0.0.1 iske
::1 localhost
t4 at iske $ cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=iske
You can check this with system-config-network
as well. Are you seeing something similar?
Tim
On 07/09/2012 10:13 AM, 何斌 wrote:
Hi,
My environment info:
OS: CentOS 5.6
Erlang: Compiled from otp_src_R15B01.tar.gz
RabbitMQ: Compiled from rabbitmq-server-2.8.4.tar.gz
ifconfig:
eth0 Link encap:Ethernet HWaddr 84:2B:2B:73:88:28
inet addr:183.*.*.* Bcast:183.60.44.127
Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:77904379 errors:0 dropped:0 overruns:0
frame:0
TX packets:65643095 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:1000
RX bytes:11615134852 (10.8 GiB) TX bytes:61820973373
(57.5 GiB)
&nb sp; Interrupt:66 Memory:da000000-da012800
eth0:0 Link encap:Ethernet HWaddr 84:2B:2B:73:88:28
inet addr:112.*.*.* Bcast:112.90.57.191
Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:66 Memory:da000000-da012800
eth1 Link encap:Ethernet HWaddr 84:2B:2B:73:88:29
inet addr:10.20.30.1 Bcast:10.20.30.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:94328707 errors:0 dropped:0 overruns:0
frame:0
TX packets:78961028 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:1000
RX bytes:77337167993 (72.0 GiB) TX bytes:15705231055
(14.6 GiB)
Interrupt:74 Memory:dc000000-dc012800
eth1:1 Link encap:Ethernet HWaddr 84:2B:2B:73:88:29
inet addr:10.20.30.251 Bcast:10.20.30.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:74 Memory:dc000000-dc012800
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2530738 errors:0 dropped:0 overruns:0
frame:0
TX packets:2530738 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:0
RX bytes:155346660 (148.1 MiB) TX bytes:155346660
(148.1 MiB)
Thank you again.
He Bin
From: watson.timothy at gmail.com
Date: Mon, 9 Jul 2012 10:00:33 +0100
CC: rabbitmq-discuss at lists.rabbitmq.com
To: rabbitmq-discuss at lists.rabbitmq.com
Subject: Re: [rabbitmq-discuss] Plz give me help about EPMD:
Non-local peer connected
What OS and rabbit version are you running? I've not seen
this happen before but I'll investigate.
On 9 Jul 2012, at 07:32, 何斌 <hebin7611 at hotmail.com>
wrote:
Hi Tim,
Thanks for your reply.
I tried "erl -sname rabbit", it's OK.
my /etc/hosts looks like following:
127.0.0.1 game-01 ZSWY76 localhost.localdomain
localhost
::1 localhost6.localdomain6 localhost6
EPMD can be started successfully, but always reports
"Non-local peer connected" then force disconnecting
rabbit-server.
Did I forget any necessory configration for RabbitMQ to
use loopback interface to connect epmd？
Thanks a lot.
He Bin
> Date: Fri, 6 Jul 2012 18:34:07 +0100
> From: tim at rabbitmq.com
> To: rabbitmq-discuss at lists.rabbitmq.com
> CC: hebin7611 at hotmail.com
> Subject: Re: [rabbitmq-discuss] Plz give me help
about EPMD: Non-local peer conne cted
>
> Hi there,
>
> On 06/07/2012 06:53, 何斌 wrote:
> > Hi all,
> >
> > I installed RabbotMQ & tried to start
it.
> >
> > But I always got error as following:
> >
>
> Ok so first of all, let's see if we can get you
to start a stand alone
> distributed Erlang node successfully. Normally
stack traces like that
> occur when the host environment isn't set up
quite right (from Erlang's
> perspective).
>
> We need to be able to run `erl -sname rabbit` on
the command line and
> see the Erlang emulator start successfully. It
should look something
> like this:
>
> ##############
>
> t4 at malachi:systest $ erl -sname rabbit
> Erlang R15B01 (erts-5.9.1) [source] [64-bit]
[smp:2:2] [async-threads:0]
> [hipe] [kernel-poll:false]
>
> Eshell V5.9.1 (abort with ^G)
> (rabbit at malachi)1>
>
> ##############
>
> Can you start Erlang like that successfully? I'm
assuming not, but
> please let us k now.
>
> I'm also interested in understanding what your
hosts configuration
> (e.g., /etc/hosts) looks like. On some Operating
Systems (such as CentOS
> for example), failing to set an explicit host
name prevents you from
> starting a distributed Erlang node.
>
> >
{error_logger,{{2012,7,6},{13,32,21}},"Protocol: ~p:
register error:
> >
~p~n",["inet_tcp",{{badmatch,{error,epmd_close}},[{inet_tcp_dist,listen,1,[{file,"inet_tcp_dist.erl"},{line,70}]},{net_kernel,start_protos,4,[{file,"net_kernel.erl"},{line,1314}]},{net_kernel,start_protos,3,[{file,"net_kernel.erl"},{line,1307}]},{net_kernel,init_node,2,[{file,"net_kernel.erl"},{line,1197}]},{net_kernel,init,1,[{file,"net_kernel.erl"},{line,357}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,304}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,227}]}]}]}
> >
{error_logger,{{2012,7,6},{13,32,21}},crash_report,[[{initial_call,{net_kernel,init,
['Argument__1']}},{pid,<0.20.0>},{registered_name,[]},{error_info,{exit,{error,badarg},[{gen_server,init_it,6,[{file,"gen_server.erl"},{line,320}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,227}]}]}},{ancest
> >
ors,[net_sup,kernel_sup,<0.9.0>]},{messages,[]},{links,[#Port<0.90>,<0.17.0>]},{dictionary,[{longnames,false}]},{trap_exit,true},{status,running},{heap_size,987},{stack_size,24},{reductions,551}],[]]}
> >
{error_logger,{{2012,7,6},{13,32,21}},supervisor_report,[{supervisor,{local,net_sup}},{errorContext,start_error},{reason,{'EXIT',nodistribution}},{offender,[{pid,undefined},{name,net_kernel},{mfargs,{net_kernel,start_link,[[rabbitmqprelaunch1077,shortnames]]}},{restart_type,permanent},{shutdown,2000},{child_type,worker}]}]}
> >
{error_logger,{{2012,7,6},{13,32,21}},supervisor_report,[{supervisor,{local,kernel_sup}},{errorContext,start_error},{reason,shutdown},{offender,[{pid,undefined},{name,net_sup},
{mfargs,{erl_distribution,start_link,[]}},{restart_type,permanent},{shutdown,infinity},{child_type,supervisor}]}]}
> >
{error_logger,{{2012,7,6},{13,32,21}},std_info,[{application,kernel},{exited,{shutdown,{kernel,start,[normal,[]]}}},{type,permanent}]}
> > {"Kern el pid
> >
terminated",application_controller,"{application_start_failure,kernel,{shutdown,{kernel,start,[normal,[]]}}}"}
> >
> > Crash dump was written to: erl_crash.dump
> > Kernel pid terminated
(application_controller)
> >
({application_start_failure,kernel,{shutdown,{kernel,start,[normal,[]]}}})
> >
> >
> > I ran it on a server with public IP
183.*.*.* .
> >
> > In Erlang src, I found that epmd checks
connection src.
> >
> > /* Determine if connection is from localhost
*/
> > if (getpeername(s->fd,(struct sockaddr*)
&si,&st) ||
> > s t < sizeof(si)) {
> > /* Failure to get peername is regarded as
non local host */
> > s->local_peer = EPMD_FALSE;
> > } else {
> > /* Only 127.x.x.x and connections from the
host's IP address
> > allowed, no false positives */
> > s->local_peer =
> > (((((unsigned) ntohl(si.sin_addr.s_addr))
& 0xFF000000U) ==
> > 0x7F000000U) ||
> > (getsockname(s->fd,(struct sockaddr*)
&di,&st) ?
> > EPMD_FALSE : si.sin_addr.s_addr == di.s
in_addr.s_addr));
> > }
> > dbg_tty_printf(g,2,(s->local_peer) ?
"Local peer connected" :
> > "Non-local peer connected");
> >
> >
> > But unfortunately, si.sin_addr.s_addr was
183.*.*.*, while
> > di.sin_addr.s_addr was 127.0.0.1
> >
& amp; gt; > My log：Checking peer address,
getsockname ret: 0, si_addr=0xb7??????,
> > di_addr=0x7f000001
> >
> >
>
> I could be wrong, but I suspect this is a red
herring. You can restart
> epmd with -d to get debugging information as
well, but I suspect this
> isn't relevant.
>
> Is there any way to force RabbitMQ server connect
epmd via a specified
> > address？
> >
>
> I'm not really sure what you mean by this, but
I'm fairly confident that
> it is not necessary to even attempt to do
something like that. Erlang
> should be able to start up nodes with `-sname
<name>` or `-name
> <name>@<host>` and if either doesn't
work, a little tweaking of the host
> configuration should solve it.
>
> Based on your original comment (starting rabbitmq
but always getting an
> error) my understanding is that you're trying to
start rabbit on this
> machine and it fails. AFAIK when a distributed
Erlang node connects to
> EPMD on the localhost it should be treated as
such. The rabbitmq-server
> script starts rabbit up with `-sname rabbit`
which implies that the node
> name will be rabbit@<hostname> so you
should make sure that `erl -sname
> rabbit` works first of all.
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