[erlang-questions] erl_call problem

Serge Aleynikov <>
Mon Oct 8 15:07:07 CEST 2012


You normally receive 'salive' in the distribution protocol when you try
to connect to a server node from another client node that has a name
already known to the server node.

I.e.:

shell1> erl -sname a

shell2> erl_call -sname a -h b -a 'timer sleep [60000]'
shell3> erl_call -sname a -h b -a 'timer sleep [60000]'

You should get a failed 'salive' connection error in shell3.

Regards,

Serge

On 10/8/2012 3:01 AM, Andrew Gopienko wrote:
> We are using erl_call for nodes monitoring and sometimes erl_call failed
> with message 'erl_call: failed to connect to node 
> <mailto:>'
> Node at this time is alive and works as usually.
> 
> We found that node at this time returns status 'salive' instead of
> expected 'sok'.
> 
> ------------------------------
> ----------------------------------------------------------------
> ei_xconnect: Sun Oct  7 16:45:00 2012: -> CONNECT attempt to connect to
> node_01
> ei_epmd_r4_port: Sun Oct  7 16:45:00 2012: -> PORT2_REQ alive=node_01
> ip=192.168.1.2
> ei_epmd_r4_port: Sun Oct  7 16:45:00 2012: <- PORT2_RESP result=0 (ok)
> ei_epmd_r4_port: Sun Oct  7 16:45:00 2012:    port=52658 ntype=77
> proto=0 dist-high=5 dist-low=5
> ei_xconnect: Sun Oct  7 16:45:00 2012: -> CONNECT connected to remote
> recv_status: Sun Oct  7 16:45:00 2012: <- len=6
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[0]=s (115)
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[1]=a (97)
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[2]=l (108)
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[3]=i (105)
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[4]=v (118)
> recv_status: Sun Oct  7 16:45:00 2012: <- buf[5]=e (101)
> ex_xconnect: Sun Oct  7 16:45:00 2012: RECV_STATUS failed
> ei_xconnect: Sun Oct  7 16:45:00 2012: -> CONNECT failed
> erl_call: failed to connect to node 
> <mailto:>, fd=-1, errno=0, erl_errno=5
> ----------------------------------------------------------------------------------------------
> 
> In what cases the node returns 'salive' ?
> 
> 
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