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I also wonder how the hostname is getting resolved. Rabbit actually
passes the hostname to erl, so you get something more like `erl
-sname rabbit@<hostname>` which is calculated something like
this:<br>
<br>
SCRIPT_DIR=`dirname $SCRIPT_PATH`<br>
RABBITMQ_HOME="${SCRIPT_DIR}/.."<br>
[ "x" = "x$HOSTNAME" ] && HOSTNAME=`env hostname`<br>
NODENAME=rabbit@${HOSTNAME%%.*}<br>
<br>
So what does `env hostname` return on your machine, and can you
start an Erlang node with this using erl -sname rabbit@`env
hostname` or some such construct?<br>
<br>
On 07/09/2012 10:00 AM, Tim Watson wrote:
<blockquote
cite="mid:818EBB58-EEEC-4382-8319-7291C1A2EF4D@rabbitmq.com"
type="cite">
<div>What OS and rabbit version are you running? I've not seen
this happen before but I'll investigate.<br>
<br>
</div>
<div>On 9 Jul 2012, at 07:32, 何斌 <<a moz-do-not-send="true"
href="mailto:hebin7611@hotmail.com">hebin7611@hotmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
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<br>
Hi Tim,<br>
<br>
Thanks for your reply.<br>
<br>
I tried "erl -sname rabbit", it's OK.<br>
<br>
my /etc/hosts looks like following:<br>
127.0.0.1 game-01 ZSWY76 localhost.localdomain localhost<br>
::1 localhost6.localdomain6 localhost6<br>
<br>
EPMD can be started successfully, but always reports
"Non-local peer connected" then force disconnecting
rabbit-server.<br>
<br>
Did I forget any necessory configration for RabbitMQ to use
loopback interface to connect epmd？<br>
<br>
Thanks a lot.<br>
<br>
He Bin<br>
<br>
<br>
<div>> Date: Fri, 6 Jul 2012 18:34:07 +0100<br>
> From: <a moz-do-not-send="true"
href="mailto:tim@rabbitmq.com">tim@rabbitmq.com</a><br>
> To: <a moz-do-not-send="true"
href="mailto:rabbitmq-discuss@lists.rabbitmq.com">rabbitmq-discuss@lists.rabbitmq.com</a><br>
> CC: <a moz-do-not-send="true"
href="mailto:hebin7611@hotmail.com">hebin7611@hotmail.com</a><br>
> Subject: Re: [rabbitmq-discuss] Plz give me help
about EPMD: Non-local peer connected<br>
> <br>
> Hi there,<br>
> <br>
> On 06/07/2012 06:53, 何斌 wrote:<br>
> > Hi all,<br>
> ><br>
> > I installed RabbotMQ & tried to start it.<br>
> ><br>
> > But I always got error as following:<br>
> ><br>
> <br>
> Ok so first of all, let's see if we can get you to
start a stand alone <br>
> distributed Erlang node successfully. Normally stack
traces like that <br>
> occur when the host environment isn't set up quite
right (from Erlang's <br>
> perspective).<br>
> <br>
> We need to be able to run `erl -sname rabbit` on the
command line and <br>
> see the Erlang emulator start successfully. It should
look something <br>
> like this:<br>
> <br>
> ##############<br>
> <br>
> t4@malachi:systest $ erl -sname rabbit<br>
> Erlang R15B01 (erts-5.9.1) [source] [64-bit]
[smp:2:2] [async-threads:0] <br>
> [hipe] [kernel-poll:false]<br>
> <br>
> Eshell V5.9.1 (abort with ^G)<br>
> (rabbit@malachi)1><br>
> <br>
> ##############<br>
> <br>
> Can you start Erlang like that successfully? I'm
assuming not, but <br>
> please let us k now.<br>
> <br>
> I'm also interested in understanding what your hosts
configuration <br>
> (e.g., /etc/hosts) looks like. On some Operating
Systems (such as CentOS <br>
> for example), failing to set an explicit host name
prevents you from <br>
> starting a distributed Erlang node.<br>
> <br>
> > {error_logger,{{2012,7,6},{13,32,21}},"Protocol:
~p: register error:<br>
> >
~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}]}]}]}<br>
> >
{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<br>
> >
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}],[]]}<br>
> >
{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}]}]}<br>
> >
{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}]}]}<br>
> >
{error_logger,{{2012,7,6},{13,32,21}},std_info,[{application,kernel},{exited,{shutdown,{kernel,start,[normal,[]]}}},{type,permanent}]}<br>
> > {"Kern el pid<br>
> >
terminated",application_controller,"{application_start_failure,kernel,{shutdown,{kernel,start,[normal,[]]}}}"}<br>
> ><br>
> > Crash dump was written to: erl_crash.dump<br>
> > Kernel pid terminated (application_controller)<br>
> >
({application_start_failure,kernel,{shutdown,{kernel,start,[normal,[]]}}})<br>
> ><br>
> ><br>
> > I ran it on a server with public IP 183.*.*.* .<br>
> ><br>
> > In Erlang src, I found that epmd checks
connection src.<br>
> ><br>
> > /* Determine if connection is from localhost */<br>
> > if (getpeername(s->fd,(struct sockaddr*)
&si,&st) ||<br>
> > s t < sizeof(si)) {<br>
> > /* Failure to get peername is regarded as non
local host */<br>
> > s->local_peer = EPMD_FALSE;<br>
> > } else {<br>
> > /* Only 127.x.x.x and connections from the
host's IP address<br>
> > allowed, no false positives */<br>
> > s->local_peer =<br>
> > (((((unsigned) ntohl(si.sin_addr.s_addr)) &
0xFF000000U) ==<br>
> > 0x7F000000U) ||<br>
> > (getsockname(s->fd,(struct sockaddr*)
&di,&st) ?<br>
> > EPMD_FALSE : si.sin_addr.s_addr == di.s
in_addr.s_addr));<br>
> > }<br>
> > dbg_tty_printf(g,2,(s->local_peer) ? "Local
peer connected" :<br>
> > "Non-local peer connected");<br>
> ><br>
> ><br>
> > But unfortunately, si.sin_addr.s_addr was
183.*.*.*, while<br>
> > di.sin_addr.s_addr was 127.0.0.1<br>
> ><br>
& gt; > My log：Checking peer address, getsockname
ret: 0, si_addr=0xb7??????,<br>
> > di_addr=0x7f000001<br>
> ><br>
> ><br>
> <br>
> I could be wrong, but I suspect this is a red
herring. You can restart <br>
> epmd with -d to get debugging information as well,
but I suspect this <br>
> isn't relevant.<br>
> <br>
> Is there any way to force RabbitMQ server connect
epmd via a specified<br>
> > address？<br>
> ><br>
> <br>
> I'm not really sure what you mean by this, but I'm
fairly confident that <br>
> it is not necessary to even attempt to do something
like that. Erlang <br>
> should be able to start up nodes with `-sname
<name>` or `-name <br>
> <name>@<host>` and if either doesn't
work, a little tweaking of the host <br>
> configuration should solve it.<br>
> <br>
> Based on your original comment (starting rabbitmq but
always getting an <br>
> error) my understanding is that you're trying to
start rabbit on this <br>
> machine and it fails. AFAIK when a distributed Erlang
node connects to <br>
> EPMD on the localhost it should be treated as such.
The rabbitmq-server <br>
> script starts rabbit up with `-sname rabbit` which
implies that the node <br>
> name will be rabbit@<hostname> so you should
make sure that `erl -sname <br>
> rabbit` works first of all.<br>
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