Active checks host not found

[felix.citycs]

Hi guys,

I am new to Zabbix ... please forgive if my question is similar to others but I have tired different way but still not solving it..

Here are my setting:

Server 1: zabbix server & zabbix agent
IP: 172.31.11.194
ubuntu@ip-172-31-11-194:~$ hostname
ip-172-31-11-194


Server 1: /usr/share/zabbix/conf/zabbix.conf.php
<?php
// Zabbix GUI configuration file.
global $DB;

$DB['TYPE'] = 'MYSQL';
$DB['SERVER'] = 'localhost';
$DB['PORT'] = '0';
$DB['DATABASE'] = 'zabbix';
$DB['USER'] = '[username]';
$DB['PASSWORD'] = '[password]';

// Schema name. Used for IBM DB2 and PostgreSQL.
$DB['SCHEMA'] = '';

$ZBX_SERVER = '172.31.11.194';
$ZBX_SERVER_PORT = '10051';
$ZBX_SERVER_NAME = 'ip-172-31-11-194';

$IMAGE_FORMAT_DEFAULT = IMAGE_FORMAT_PNG;

Server 1: /etc/zabbix/zabbix_server.conf
DBHost=localhost
DBUser=[username]
DBPassword=[password]

Server 1: /etc/zabbix/zabbix_agentd.conf
Server=172.31.11.194
ServerActive=172.31.11.194:10051
Hostname=172.31.11.194



Server 2: zabbix agent
IP: 172.31.6.97
ubuntu@ip-172-31-6-97:~$ hostname
ip-172-31-6-97

Server 2: /etc/zabbix/zabbix_agentd.conf
Server=172.31.11.194
ServerActive=172.31.11.194:10051
Hostname=172.31.11.194



Server 3: zabbix agent
IP: 172.31.12.68
ubuntu@ip-172-31-12-68:~$ hostname
ip-172-31-12-68

Server 3: /etc/zabbix/zabbix_agentd.conf
Server=172.31.11.194
ServerActive=172.31.11.194:10051
Hostname=172.31.11.194


And here are the logs returning..

Server 1: /var/log/zabbix/zabbix_server.log
16574:20180604:032106.488 cannot send list of active checks to "172.31.6.97": host [172.31.11.194] not found
16574:20180604:032121.554 cannot send list of active checks to "172.31.12.68": host [172.31.11.194] not found
16574:20180604:032129.299 cannot send list of active checks to "172.31.11.194": host [172.31.11.194] not found
16574:20180604:032306.637 cannot send list of active checks to "172.31.6.97": host [172.31.11.194] not found
16574:20180604:032321.578 cannot send list of active checks to "172.31.12.68": host [172.31.11.194] not found
16572:20180604:032329.324 cannot send list of active checks to "172.31.11.194": host [172.31.11.194] not found
16574:20180604:032506.660 cannot send list of active checks to "172.31.6.97": host [172.31.11.194] not found
16577:20180604:032521.602 cannot send list of active checks to "172.31.12.68": host [172.31.11.194] not found
16577:20180604:032529.347 cannot send list of active checks to "172.31.11.194": host [172.31.11.194] not found

Server 1: /var/log/zabbix/zabbix_agentd.log
16748:20180604:031929.275 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
16748:20180604:032129.299 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
16748:20180604:032329.324 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found

Server 2: /var/log/zabbix/zabbix_agentd.log
17064:20180604:031906.457 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
17064:20180604:032106.481 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
17064:20180604:032306.632 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found

Server 3: /var/log/zabbix/zabbix_agentd.log
14006:20180604:031921.516 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
14006:20180604:032121.538 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found
14006:20180604:032321.562 no active checks on server [172.31.11.194:10051]: host [172.31.11.194] not found



Basically I have tried also changing the $ZBX_SERVER to OS hostname (i.e. ip-172-31-11-194), and corresponding Hostname parameter in zabbix_agentd.log. After restarting both zabbix server and all agents, the problem is still there...
I think I got lost somewhere setting the hostname in zabbix.. can you guys advise me how to fix it? Thank you very much.

[Atsushi]

The setting of Hostname in zabbix_agentd.conf on each server is incorrect without Server 1.

Hostname does not specify the name corresponding to the host of the Zabbix server.
Specify the name of the host itself that starts the Zabbix agent.

And the name you specified for Hostname in zabbix_agentd.conf must be registered as a host on the Web frontend on the Zabbix server.

[felix.citycs]

Hi Atsushi,

Thank you very much.
I find out the Hostname parameter in zabbix agent should be same as the "Hostname" in "Host" page on the Zabbix Web GUI.