Template not linking to other template

[tschwerz]

Hi all

I have a problem trying to apply a template to devices. The situation is as follows: We're monitoring a lot of network devices and have different templates for different customers and devices. We have been using the TEMPLATE_ICMP_PING as part of those templates until now, so we linked this template to our templates (among others). But now I want to make a few changes to the ICMP monitoring such as different triggers and also since it's not recommended to use the defaults template in production i'm trying to change the used template I took the following steps:

• Clone the "TEMPLATE_ICMP_PING" template under a different name and not change any items

• Go to one of our templates, unlink (without clearing) the "TEMPLATE_ICMP_PING" template

• Linking the newly cloned template in its stead and click update

What I intended to happen is that the items get then linked to the new template because it has the same items and actions and then I could adapt the new templates to our needs. I first tested this approach with a template which is just linked to a small number of hosts (about 10) and it worked perfectly as expected.
The Problem: When I try to do the exact same thing for another template which is linked to more hosts (41 to be precise) it doesn't work. When I click on update zabbix loads for 2-3 seconds and then displays a blank page (see Screenshot). The template doesn't get linked no matter how long I wait or what I do.

I don't think this approach should cause any issues since that's how templates are supposed to work and it doesn't make any sense if it's not working for only ~40 Hosts. I have some templates with way more hosts than that to which I want to do the same thing. Or am I wrong here?

Does anybody have any experience with this issue?

[kaspars.mednis]

Hi!

I suggest you look at your webserver (apache?) error.log for any errors. Usually there are timeouts or not enough memory errors related to large update requests

Regards,
Kaspars

[tschwerz]

Hi

Thanks for your input. I had a look at the webserver logs (nginx) and I can't find anything usual. Here's the log outputs if I try to link the template and the two minutes afterwards:
error.log
access.log

[kaspars.mednis]

Hi,

i found the following error in your error log

2018/01/04 13:29:22 [info] 2606#2606: *2090240 client closed connection while waiting for request, client: 193.43.27.196, server: 0.0.0.0:443

what are your php setings on:

php_value max_execution_time
php_value memory_limit
php_value max_input_time
php_value max_input_vars

[tschwerz]

Hi, thanks for your help. These are the current parameters from /etc/httpd/conf.d/zabbix.conf:

        php_value max_execution_time 300
        php_value memory_limit 128M
        php_value post_max_size 16M
        php_value upload_max_filesize 2M
        php_value max_input_time 300
        php_value always_populate_raw_post_data -1

I can't find the "php_value max_input_vars" parameter in this file.

[kaspars.mednis]

You can specify it in this file

php_value max_input_vars 5000

also you can increase memory limit for testing purpouses

php_value memory_limit 1024M

Regards
Kaspars

[tschwerz]

I set the parameters according to your recommendation and then restarted the zabbix-server service and nginx but unfortunately I still get the same result on the web front-end and the same entry in the error.log

2018/01/04 15:39:38 [info] 2608#2608: *2096855 client closed connection while waiting for request, client: 172.23.130.251, server: 0.0.0.0:443

[kaspars.mednis]

I still believe there can be some timeout or memory limit problem.
Are your php errors logged somewhere ?

Im not using nginx personally, but i have found some articles regarding php error logging with nginx

https://ed.gs/2012/10/16/php-fpm-error-logging-to-nginx/

https://gist.github.com/joerx/87c6755023d2817154b41264311fcfe6

Maybe it helps

Regards
Kaspars

[tschwerz]

You might be right on that. I had a further look and found logs from php-fpm where I found this log-entry when I again tried to link the template:

[04-Jan-2018 16:03:37 Europe/Zurich] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in /usr/share/zabbix/include/classes/debug/CProfiler.php on line 217

[kaspars.mednis]

Allowed memory size of 134217728 bytes exhausted

is because you have

php_value memory_limit 128M

just double it...

 php_value memory_limit 256M

or even

 php_value memory_limit 512M

until its enough...

Regards,
Kaspars

[aib]

In addition, check "memory_limit" settings for php-fpm.
It can be somewhere like /etc/php5/fpm/php.ini
Use the same amount of memory as you configured in main php.ini

memory_limit = 512M

PS There is an article about increasing memory limit and checking that limits. https://tutorials.hostucan.com/how-t...-memory-limit/