not able to monitor apache httpd-2.4.57 in zabbix

[pradeepmp]

Hello, I am using zabbix agent 2, on rhel 7.9 . I need to monitor a webserver running httpd-2.4.57 . most of the variables are showing not supported. Pls see the below screenshot


In my httpd.conf file, I have added the following lines at bottom is as shown below



in folder /etc/httpd/conf.d, I have the my_website_name.conf and here also i ve added the same lines



I am using Apache by zabbix agent template with settings as below


pls guide me in this regard

[cyber]

If an item is not supported, you should see reason, when you click on that red exclamation mark beside it...
If some of those dependent items are ok and some not, there is probably some missing data in output...

[pradeepmp]

this is another screenshot showing errors.

is this a bug in zabbix-agent2. There is another webserver where zabbix-agent2 is running perfectly well. All apache variables are fetched. same apache version and rhel 7.9. same apache configuration.

[Atsushi]

The item Apache Requests per second is a Dependent item, right? Isn't the value of the parent item not being retrieved correctly?
Also, if that parent item is being retrieved via Zabbix agent 2 and calling the local httpd server-status, I think you should allow access from 127.0.0.1.

[pradeepmp]

So should i be modifying code like this?

<Location "/server-status">
SetHand1er server-status
Order deny, allow
Deny from all
Allow from 127.0.0.1
</Location>

[pradeepmp]

Tried all methods. No hope. Same configuration on HA machine, of same website, works. but on primary machine not at all working. Same apache version, same zabbix agent, monitoring from same server.

[tim.mooney]

Have you actually looked at the httpd access_log, to verify that zabbix agent2 is attempting to connect on the frequency you expect? Have you increased the log level on the system that is having problems, to see if a clue about the problem appears in the error_log?

It's not causing the problem here, but you're using deprecated access control syntax (Order, Deny, Allow). You should switch to the modern access control syntax.

[pradeepmp]

my rhel version
# hostnamectl
Virtualization: kvm
Operating System: Red Hat Enterprise Linux Server 7.9 (Maipo)
CPE OS Name: cpe:/o:redhat:enterprise_linux:7.9:GA:server
Kernel: Linux 3.10.0-1160.71.1.el7.x86_64
Architecture: x86-64

apache version
# httpd -v
Server version: Apache/2.4.57 (codeit)
Server built: Apr 6 2023 17:31:51

I tested the modern access control syntax
In my httpd.conf file I've added
&lt;Location "/server-status"&gt;
SetHandler server-status
Require all denied
Require ip 127.0.0.1 192.168.1.171
&lt;/Location&gt;
ExtendedStatus On
TraceEnable Off
ServerName 127.0.0.1

httpd error log entries:

[Sun Sep 03 02:13:00.390273 2023] [access_compat:error] [pid 25794:tid 139904566671104] [client 127.0.0.1:41376] AH01797: client denied by server configuration: /var/www/html/futuriq/server-status
[Sun Sep 03 02:14:00.632394 2023] [access_compat:error] [pid 25862:tid 139904575063808] [client 127.0.0.1:41402] AH01797: client denied by server configuration: /var/www/html/futuriq/server-status
[Sun Sep 03 02:15:00.408441 2023] [access_compat:error] [pid 25794:tid 139904423995136] [client 127.0.0.1:41434] AH01797: client denied by server configuration: /var/www/html/futuriq/server-status
.
.
similar entries.

access logs has these entries
192.168.1.171 - - [03/Sep/2023:03:09:00 +0530] "GET /server-status?auto HTTP/1.1" 404 13535 "-" "Zabbix 6.4.6"
.
.
similar entries


.htaccess file
# Disable Directory Listing
Options -Indexes

# Deny Access to Certain Files by Extension
&lt;FilesMatch "\.(env|json|config\.js|md|gitignore|gitattrib utes |lock)$"&gt;
Order deny,allow
Deny from all
&lt;/FilesMatch&gt;

&lt;IfModule mod_rewrite.c&gt;
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]
&lt;/IfModule&gt;

I think there is something wrong in htaccess.

My httpd.conf file is attached

[pradeepmp]

I have used the modern access control syntax inside httpd.conf
<Location "/server-status">
SetHandler server-status
Require all denied
Require ip 127.0.0.1 192.168.1.171
</Location>

[pradeepmp]

# links http://192.168.1.171/server-status says link Expired. I think this is cause

[pradeepmp]

solved the issue. .htaccess was rewriting all urls

[pradeepmp]

I am using latest zabbix 6.4.1. I too facing error "Zabbix value cache working in low memory mode". average use of value cache is 70%. Default value in zabbix_server.conf is 8M. Is it ok to double it ?
and what does HistoryIndexCacheSize and HistoryCacheSize do? Do I have to increase them also?

[cyber]

I am using latest zabbix 6.4.1. I too facing error "Zabbix value cache working in low memory mode". average use of value cache is 70%. Default value in zabbix_server.conf is 8M. Is it ok to double it ?
and what does HistoryIndexCacheSize and HistoryCacheSize do? Do I have to increase them also?

yes, of course it is OK to increase the value, if it becomes too small.
Descriptions for different parameters you can find here .. https://www.zabbix.com/documentation.../zabbix_server

[pradeepmp]

Tnks it is resolved now.

[pradeepmp]

But I have another issue. Below is of log zabbix server 6.4.1 installed on RHEL 8 machine.

# tail -f /var/log/zabbix/zabbix_server.log
Start tag expected, '<' not found
ERROR 1045 (28000): Access denied for user 'zabbix'@'localhost' (using password:
^
parser error : Start tag expected, '<' not found
ERROR 1045 (28000): Access denied for user 'zabbix'@'localhost' (using password:
^
2217281:20230912:220532.749 cannot send list of active checks to "127.0.0.1": host [zabbix-server] not found

And zabbix agent log on same machine
tail -f /var/log/zabbix/zabbix_agentd.log
2218088:20230912:221107.856 no active checks on server [127.0.0.1:10051]: host [zabbix-server] not found
2218088:20230912:221112.858 no active checks on server [127.0.0.1:10051]: host [zabbix-server] not found


But zabbix server is working fine with almost 200 clients . I am getting all zabbix server monitoring parameters on front end. No issues. But why do these error msg keep displaying?