[ZBX-15092] Active Checks not reported to Zabbix Created: 2018 Oct 30  Updated: 2018 Dec 19  Resolved: 2018 Dec 19

Status: Closed
Project: ZABBIX BUGS AND ISSUES
Component/s: Agent (G), Proxy (P)
Affects Version/s: 3.4.14, 4.0.2
Fix Version/s: None

Type: Incident report Priority: Trivial
Reporter: Daniel Weber Assignee: Unassigned
Resolution: Won't fix Votes: 0
Labels: usability
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified
Environment:

We have Zabbix Server, Zabbix Proxy and Zabbix Clients


 Description   

Steps to reproduce:

  1. Install Linux Maschine with Name "testmachine01.test.lds" with Zabbix Agent
  2. Configure Maschine in Zabbix with Lower and Upper Case TESTMachine01.test.lds
  3. Create Items for Machine with "Zabbix Agent (Active)" Checks and "Zabbix Agent" Checks

Result:

Zabbix Agent Checks are there

Zabbix Agent Active Checks are not displayed

Log File shows:

22554:20181030:045215.477 In recv_agenthistory()
22554:20181030:045215.477 In process_client_history_data()
22554:20181030:045215.477 In parse_history_data()
22554:20181030:045215.477 End of parse_history_data():SUCCEED processed:20/20
22554:20181030:045215.477 In process_history_data()
22554:20181030:045215.477 End of process_history_data() processed:0
22554:20181030:045215.477 End of process_client_history_data():SUCCEED
22554:20181030:045215.477 In zbx_send_response()
22554:20181030:045215.477 zbx_send_response() '{"response":"success","info":"processed: 0; failed: 20; total: 20; seconds spent: 0.000308"}'

Only in Debug Mode!
Expected:
Log File should show something like this, so we know that the configuration of the Server was wrong:

Machine TESTMachine01.test.lds not found for sending active Checks to Zabbix

 

 Comments   
Comment by Daniel Weber [ 2018 Oct 30 ]

The Data will not be published on Zabbix, because the Name of the machine mismatches the Upper-Lower-Case of the Hostname in Zabbix.
To find such problems, there should be a Warning or Error in the log describing that, so we can find such errors.

Comment by Aigars Kadikis [ 2018 Dec 06 ]

Hello Daniel,

version 3.4 is unsupported version https://www.zabbix.com/life_cycle_and_release_policy

I checked this scenario with Zabbix server version 4.0.2 together with Zabbix agent 4.0.2 and, yes, the problem is relevant. Regarding active checks there definitely should be error message inside zabbix_agentd.log:

no active checks on server [zabbix.server.domain:10051]: host [TESTMachine01.test.lds] not found

I would like to name this problem as "Hostname title are not respected in case sensitive manner".

Comment by Aigars Kadikis [ 2018 Dec 06 ]

Hello Daniel,

We need more info. Please authorize inside database client and execute these queries on to 'zabbix' database:

show create database zabbix\G;
show create table hosts\G;
Comment by Aigars Kadikis [ 2018 Dec 19 ]

Hello daniel.weber ,

Just concluded a summary from this problem. I had this issue on a well-lived instance too. This is very related to 'COLLATE=utf8_bin'. Either it is in database level or in table level. You can check the COLLATE situation with:

show create database zabbix;
# it should report:
# CREATE DATABASE `zabbix` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8mb4_bin */

SELECT * FROM information_schema.TABLES WHERE table_schema = 'zabbix' AND table_collation != 'utf8_bin';
# it should report nothing

 

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