topic Engine always offline in Qlik NPrinting

Engine always offline

sifatnabil — Mon, 07 Mar 2016 09:09:44 GMT

Hi all,

While troubleshooting why the engine is always offline, I found the scheduler logs with this error:

2016-03-04 18:42:42,369 [6] FATAL Qlik.NPrinting.Scheduler.SchedulerHttpService -

*********************************************

Error: RabbitMQ message broker is unreachable

Shutting down scheduler service

*********************************************

2016-03-04 18:42:42,370 [6] FATAL Qlik.NPrinting.Scheduler.SchedulerHttpService - Unable to start SchedulerService: exception of type System.AggregateException

One or more errors occurred.

2016-03-04 18:42:42,372 [6] FATAL Qlik.NPrinting.Scheduler.SchedulerWindowsService - Cannot start scheduler service: One or more errors occurred.

The troubleshooting guide refers me to the RabbitMQ Clustering Guide and the Erlang cookie. Does anyone have a set of steps to solve this issue?

Re: Engine always offline

avinashelite — Mon, 07 Mar 2016 09:34:55 GMT

Check this for the detailed information

https://help.qlik.com/en-US/nprinting/17.0/Content/Troubleshooting/Troubleshooting.htm

Re: Engine always offline

sifatnabil — Mon, 07 Mar 2016 09:53:20 GMT

Hi Avinashelite‌, I looked there but I cannot locate the RabbitMQ command prompt to troubleshoot:

Check that RabbitMQ service is running. If it is, open the RabbitMQ command prompt (sbin dir) in the start menu, and then type and run the command rabbitmqctl.bat list_permissions

The following lines must be displayed:

Listing permissions in vhost "/" ...

guest .* .* .*

remote .* .* .*

It doesn't appear on my start menu...any idea where I can locate it?

Re: Engine always offline

avinashelite — Mon, 07 Mar 2016 10:03:00 GMT

check this

RabbitMQ - RabbitMQ Configuration

RabbitMQ - Clustering Guide

Re: Engine always offline

avinashelite — Mon, 07 Mar 2016 10:05:42 GMT

check this

//www.rabbitmq.com/configure.html#define-environment-variables

//www.rabbitmq.com/clustering.html

Re: Engine always offline

sifatnabil — Mon, 07 Mar 2016 12:29:05 GMT

I believe I first installed this on a non-logon as service account, and then started using it on the logon as service account. So I uninstalled it completely (including RabbitMQ and Erlang), then reinstalled it using the logon as service account, and it worked fine without going through any RabbitMQ configurations.

Re: Engine always offline

Anonymous — Fri, 01 Apr 2016 08:40:04 GMT

Sifat, thank you for your post.

I encountered the exact same problem, rabbitMQ and Erlang were installed on an account without logon as service.

After reinstalling with a logon as service account it popped online

Peter

Re: Engine always offline

Tue, 28 Feb 2017 09:59:53 GMT

Hello,

I encountered the same problem on my NPrinting 17.2.0 installation. The services Rabbit MQ & Nprinting Scheduler could not stay UP.

NPrinting Scheduler was giving me the same log as you:

Error: RabbitMQ message broker is unreachable

Shutting down scheduler service

But then I checked the RabbitMQ logs (in <Users>\svc_app_qlik\AppData\Roaming\RabbitMQ\log) and found this in the sasl.log :

=CRASH REPORT==== 28-Feb-2017::10:27:51 ===

crasher:

initial call: application_master:init/4

pid: <0.93.0>

registered_name: []

exception exit: {bad_return,

{{rabbit,start,[normal,[]]},

{'EXIT',

{{badmatch,

{error,

{{{badmatch,

{error,

{not_a_dets_file,

"c:/Users/<USER>/AppData/Roaming/RabbitMQ/db/rabbit@<SERVER HOSTNAME>-mnesia/recovery.dets"}}},

[{rabbit_recovery_terms,open_table,0,[]},

{rabbit_recovery_terms,init,1,[]},

{gen_server,init_it,6,

[{file,"gen_server.erl"},{line,328}]},

{proc_lib,init_p_do_apply,3,

[{file,"proc_lib.erl"},{line,240}]}]},

{child,undefined,rabbit_recovery_terms,

{rabbit_recovery_terms,start_link,[]},

transient,4294967295,worker,

[rabbit_recovery_terms]}}}},

[{rabbit_queue_index,start,1,[]},

{rabbit_variable_queue,start,1,[]},

{rabbit_priority_queue,start,1,[]},

{rabbit_amqqueue,recover,0,[]},

{rabbit,recover,0,[]},

{rabbit,'-run_step/2-lc$^1/1-1-',1,[]},

{rabbit,run_step,2,[]},

{rabbit,'-run_boot_steps/1-lc$^0/1-0-',1,[]}]}}}}

in function application_master:init/4 (application_master.erl, line 134)

ancestors: [<0.92.0>]

messages: [{'EXIT',<0.94.0>,normal}]

links: [<0.92.0>,<0.7.0>]

dictionary: []

trap_exit: true

status: running

heap_size: 1598

stack_size: 27

reductions: 282

neighbours:

And thanks to this thread (Google Groups) I could finally understand and solve the problem:

RabbitMQ could not read "recovery.dets" (in RabbitMQ's db directory), which suggests it was corrupted or modified by another piece of software.

Removing that file and restarting the service helped me keeping both RabbitMQ and NPrinting Scheduler services up.

Re: Engine always offline

marcos — Thu, 22 Feb 2018 09:19:50 GMT

Thankyou Jean-Baptiste. This was useful for me