GNU bug report logs - #37631
service zabbix-server (and zabbix-agent) fails starting (cannot run as root!)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Giovanni Biscuolo <g <at> xelera.eu>
Subject: bug#37631: closed (Re: bug#37631: service zabbix-server (and
 zabbix-agent) fails starting (cannot run as root!))
Date: Sat, 05 Oct 2019 16:16:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#37631: service zabbix-server (and zabbix-agent) fails starting (cannot run as root!)

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 37631 <at> debbugs.gnu.org.

-- 
37631: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=37631
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Giovanni Biscuolo <g <at> xelera.eu>
To: 37631-done <at> debbugs.gnu.org
Cc: Gábor Boskovits <boskovits <at> gmail.com>
Subject: Re: bug#37631: service zabbix-server (and zabbix-agent) fails
 starting (cannot run as root!)
Date: Sat, 05 Oct 2019 18:15:14 +0200

Gábor Boskovits <boskovits <at> gmail.com> writes:

[...]

>> Can we consider this resolved then?

oh yes sorry, forgot to (auto) close this bug as done: this message
should do it

Thanks! Gio'

[...]

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

[Message part 3 (message/rfc822, inline)]

From: Giovanni Biscuolo <g <at> xelera.eu>
To: bug-guix <at> gnu.org
Subject: service zabbix-server (and zabbix-agent) fails starting (cannot run
 as root!)
Date: Sat, 05 Oct 2019 12:14:10 +0200

Hi Guix,

executive summary: do we really need to start zabbix_server in
foreground mode?

I have a Guix System in which I defined this services (thanks to the
work in guix-maintenance):

--8<---------------cut here---------------start------------->8---
	   ;; For the Zabbix database.  It was created by manually
	   ;; following the instructions here:
	   ;; https://www.zabbix.com/documentation/4.2/manual/appendix/install/db_scripts
           (postgresql-service)

	   ;; Monitoring

	   (service zabbix-agent-service-type)

           (service zabbix-server-service-type
		    (zabbix-server-configuration
		     (include-files '("/root/secrets/zabbix-server-dbpass"))
		     (log-type "file")))

           (service zabbix-front-end-service-type
                    (zabbix-front-end-configuration
                     (nginx (list
                             (nginx-server-configuration
                              (root #~(string-append #$zabbix-server:front-end "/share/zabbix/php"))
                              (listen '("7878"))
			      (index '("index.php"))
			      (locations
			       (let ((php-location (nginx-php-location)))
				 (list (nginx-location-configuration
					(inherit php-location)
					(body (append (nginx-location-configuration-body php-location)
						      (list "
fastcgi_param PHP_VALUE \"post_max_size = 16M 
                          max_execution_time = 300\";
"))))))))))
                       (db-secret-file "/root/secrets/zabbix-front-end-dbpass"))))
--8<---------------cut here---------------end--------------->8---

The zabbix frontend service is running well but the zabbix-server
refuses to start

--8<---------------cut here---------------start------------->8---
$ herd start zabbix-server
Service zabbix-server could not be started.
herd: failed to start service zabbix-server
--8<---------------cut here---------------end--------------->8---

looking in the current system profile (built with a guix master branch
on 27 Sept)

--8<---------------cut here---------------start------------->8---
Generation 12	Sep 27 2019 21:18:26	(current)
  file name: /var/guix/profiles/system-12-link
  canonical file name: /gnu/store/h03qdv70sgndclgp04dpkka4rqlk9fg3-system
  label: GNU with Linux-Libre 5.2.17
  bootloader: grub
  root device: UUID: 9862e534-946d-4323-b7ce-9937661bdb7d
  kernel: /gnu/store/bjs8k11phqhn39n7cs1wix5x147fwhnn-linux-libre-5.2.17/bzImage
--8<---------------cut here---------------end--------------->8---

I found the shepherd uses
/gnu/store/lm1d60d0kra3z86hcjmav828cfxjcgi8-shepherd-zabbix-server.scm
with this (partial) parameters:

--8<---------------cut here---------------start------------->8---
#:start (make-forkexec-constructor (list "/gnu/store/qcm5j0wk8rs6ykn6b10vg8awf2v6kvx1-zabbix-server-4.2.0/sbin/zabbix_server" "--config" "/gnu/store/w1vgvlbzs3jks014r5dra7ih6g7r26n7-zabbix_server.conf" "--foreground") #:user "zabbix" #:group "zabbix" #:pid-file "/var/run/zabbix/zabbix_server.pid"
--8<---------------cut here---------------end--------------->8---

and if I try to start it from the command line:

--8<---------------cut here---------------start------------->8---
/gnu/store/qcm5j0wk8rs6ykn6b10vg8awf2v6kvx1-zabbix-server-4.2.0/sbin/zabbix_server --config /gnu/store/w1vgvlbzs3jks014r5dra7ih6g7r26n7-zabbix_server.conf --foreground
--8<---------------cut here---------------end--------------->8---

I get:

--8<---------------cut here---------------start------------->8---
zabbix_server [879]: cannot run as root!
--8<---------------cut here---------------end--------------->8---

I had a look in upstream bug reports but was not able to find nothing
strictly related to zabbix_server, but I was able fo find this for
zabbix_agentd https://support.zabbix.com/browse/ZBX-10611 (fixed since
4.2.1rc1)

actually if I start zabbix_server without ``--foreground'' the server
starts without problems

I thought upgrading to the last stable release of zabbix was the
solution, so I submitted a patch (bug#37629) to upgrade to 4.2.7 and now
I'm using a custom channel with that patch applied:

--8<---------------cut here---------------start------------->8---
(list (channel
        (name 'guix)
	(url "https://gitlab.com/gbiscuolo/guix.git")
	(branch "wip-zabbix-update")))
--8<---------------cut here---------------end--------------->8---

but if I switch to my last system generation (built with the above channel):

--8<---------------cut here---------------start------------->8---
Generation 13	Oct 05 2019 10:24:28
  file name: /var/guix/profiles/system-13-link
  canonical file name: /gnu/store/bmmjbk6sidqjahq0i53mgp38b342lnda-system
  label: GNU with Linux-Libre 5.3.2
  bootloader: grub
  root device: UUID: 9862e534-946d-4323-b7ce-9937661bdb7d
  kernel: /gnu/store/b28yv4dww1fha0hdhxibfg0k1f50sy0f-linux-libre-5.3.2/bzImage
--8<---------------cut here---------------end--------------->8---

and reboot...

--8<---------------cut here---------------start------------->8---
$ sudo herd status zabbix-server
Status of zabbix-server:
It is stopped.
It is enabled.
Provides (zabbix-server).
Requires ().
Conflicts with ().
Will be respawned.
--8<---------------cut here---------------end--------------->8---

this time if I start zabbix_server from the command line:

--8<---------------cut here---------------start------------->8---
 $ /gnu/store/94w5smlc86xac7v1vz4wbqkq43b2fia8-zabbix-server-4.2.7/sbin/zabbix_server --config /gnu/store/w1vgvlbzs3jks014r5dra7ih6g7r26n7-zabbix_server.conf --foreground
Starting Zabbix Server. Zabbix 4.2.7 (revision 624fb7497b).
Press Ctrl+C to exit.

--8<---------------cut here---------------end--------------->8---

the server starts but the console remains open (as expected by using of
foreground) and if I press Ctrl+C obviously the server is terminated

AFAIU the foreground process never exits and shepherd times it out:
right?

the same thing **almost** apply to zabbix-agent that is also
started with "--foregroud": it is started by shepherd, the console gets
busy (so I cannot login for exemple) but if I press Ctrl+C the process
keeps running

--8<---------------cut here---------------start------------->8---
$ sudo herd status zabbix-agent
Status of zabbix-agent:
  It is started.
  Running value is 277.
  It is enabled.
  Provides (zabbix-agent).
  Requires ().
  Conflicts with ().
  Will be respawned.
--8<---------------cut here---------------end--------------->8---

strange behaviour

anyway back to the question: do we need to start zabbix_server and
zabbix_agentd in foreground?

Thanks! Gio'

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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