centengine service don't start on boot

[vhsantos]

BUG REPORT INFORMATION

Prerequisites

The opened issue, must be code related. GitHub is not meant for support. Feel free to check the CONTRIBUTING section for more details.

Versions 20.04.4

Operating System

Ubuntu/Debian

How the the component has been installed and versions

• [x] From sources

Description

After install the centengine in a remote poller, the service not start on boot (but work well if you start it manually), that is because the systemd script depends of centreon and cbd services to be started before. But in this case (a remote poller), the server don't have this services installed, only the centengine.

Steps to Reproduce

Please describe precisely the steps to reproduce the encountered issue.

1. clone the centengine repo
2. compile and install it
3. export the configuration from central poller
4. check that centengine is working in the remote poller
5. reboot the server
6. centengine wont be running.

Describe the received result

sudo journalctl -u centengine
systemd[1]: centengine.service: Unit cannot be reloaded because it is inactive.

Describe the expected result

sudo journalctl -u centengine
-- Reboot --
systemd[1]: Started Centreon Engine.
Reading main configuration file '/etc/centreon-engine/centengine.cfg'.
Processing object config file '/etc/centreon-engine/hostTemplates.cfg'
Processing object config file '/etc/centreon-engine/hosts.cfg'
Processing object config file '/etc/centreon-engine/serviceTemplates.cfg'
Processing object config file '/etc/centreon-engine/services.cfg'
Processing object config file '/etc/centreon-engine/commands.cfg'
Processing object config file '/etc/centreon-engine/contactgroups.cfg'
Processing object config file '/etc/centreon-engine/contacts.cfg'
Processing object config file '/etc/centreon-engine/hostgroups.cfg'
Processing object config file '/etc/centreon-engine/servicegroups.cfg'
Processing object config file '/etc/centreon-engine/timeperiods.cfg'
Processing object config file '/etc/centreon-engine/escalations.cfg'
Processing object config file '/etc/centreon-engine/dependencies.cfg'
Processing object config file '/etc/centreon-engine/connectors.cfg'
Processing object config file '/etc/centreon-engine/meta_commands.cfg'
Processing object config file '/etc/centreon-engine/meta_timeperiod.cfg'
Processing object config file '/etc/centreon-engine/meta_host.cfg'
Processing object config file '/etc/centreon-engine/meta_services.cfg'
Reading resource file '/etc/centreon-engine/resource.cfg'

Workaround

Changing the systemd script (centengine.service) will work, but maybe it will generate problems in a server with centreon/cbd/centengine services. Perhaps an alternative should be to create a specific systemd script to be used when the installation are "remote poller only".

--- /lib/systemd/system/centengine.service-old
+++ /lib/systemd/system/centengine.service-new
@@ -18,10 +18,7 @@

 [Unit]
 Description=Centreon Engine
-PartOf=centreon.service
-After=centreon.service
-ReloadPropagatedFrom=centreon.service
-After=cbd.service
+After=network.target

 [Service]
@@ -31,5 +28,5 @@
 User=centreon-engine

 [Install]
-WantedBy=centreon.service
+WantedBy=multi-user.target

[UrBnW]

After does not mean Wants, so After=cbd.service will have no impact if you don't have cbd service on your system. This specific cbd rule has been added thanks to https://github.com/centreon/centreon-engine/pull/172.

[vhsantos]

Hi @UrBnW ,

you are correct about that "After" don't create a service dependency, my idea in this case was to create a clear systemd script to be used in a centreon-engine only.

Anyway, to avoid to have 02 different files:

• one to centreon-engine standalone
• and other to centreon-engine + centreon a better solution is only to add this lines in the actual systemd script:

[Unit]
[...]
After=network.target

[Install]
[...]
WantedBy=multi-user.target

the first is only a good practice, but the second is necessary if we want to enable the centreon-engine service at boot.

attentive.