[chef] Scaling erchef horizontally

[Darío Ezequiel Nievas < >]

Hi Guys,

I'm having a bit of a problem trying to scale erchef between several nodes

First, let me give you guys an overview of my environment

-2 (there will be more) servers behind a load balancer, running the following services:
  -bookshelf
  -chef-expander
  -chef-server-webui
  -erchef
  -nginx

-2 servers behind a load balancer, runing these services:

  -chef-solr

  -rabbitmq

-a Postgresql cluster (using pgpool) for the chefdb

Now, the problem

I can't seem to have erchef listening on port 8000 on both servers at the same time. When erchef starts on one of the servers, it starts crashing on the other one

=CRASH REPORT==== 24-Apr-2014::12:35:15 ===
  crasher:
    initial call: sqerl_client:init/1
    pid: <0.131.0>
    registered_name: []
    exception exit: {stop,timeout}
      in function  gen_server:init_it/6 (gen_server.erl, line 320)
    ancestors: [<0.112.0>,pooler_pool_sup,pooler_sup,sqerl_sup,<0.107.0>]
    messages: []
    links: [<0.112.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 4181
    stack_size: 24
    reductions: 22425
  neighbours:

=SUPERVISOR REPORT==== 24-Apr-2014::12:35:15 ===
     Supervisor: {<0.112.0>,pooler_pooled_worker_sup}
     Context:    child_terminated
     Reason:     {stop,timeout}
     Offender:   [{pid,<0.131.0>},
                  {name,sqerl_client},
                  {mfargs,{sqerl_client,start_link,undefined}},
                  {restart_type,temporary},
                  {shutdown,brutal_kill},
                  {child_type,worker}]

-If I stop erchef on node 1, the crash reports stop, and erchef starts listening on node2:8000

-Then, If I try to start erchef on node1, It won't work, unless I stop it on node2

Is there a way to avoid this, in order to be able to scale as many erchef instances as needed?

Thanks in advance!

Dario Nievas (Snowie)
MercadoLibre Cloud Services
Arias 3751, Piso 7 (C1430CRG)
Ciudad de Buenos Aires - Argentina
Cel: +549(11) 11-6370-6406
Tel : +54(11) 4640-8443