Zabbix Info – My IT Notes

Zabbix Documentation 5.0

https://www.zabbix.com/documentation/current/start

Install and configure Zabbix 4.0

https://serveradmin.ru/ustanovka-i-nastroyka-zabbix-4-0/

Monitoring SNMP devices with Zabbix:

https://www.experts-exchange.com/articles/31203/Monitoring-SNMP-devices-with-Zabbix.html

ESXi:

# esxcli system snmp set –communities GokuBlack
# esxcli system snmp set –syscontact=”Zamasu <zamasu@dbsuper.com>”
# esxcli system snmp set –syslocation=”Universe10 – IT Room”
# esxcli system snmp set –enable true

https://techexpert.tips/ru/vmware-ru/zabbix-monitor-vmware-esxi-с-использованием-snmp/

https://sysadmin-note.ru/monitoring-esxi-6-zabbix-3-x/

https://habr.com/en/sandbox/135130/

https://www.zabbix.org/wiki/Esxi_standalone_template

Integration with Mattermost:

https://www.zabbix.com/integrations/mattermost
https://habr.com/ru/post/442404/

chmod 755 /usr/lib/zabbix/alertscripts/zabbixMatterBot.pl
“Can’t locate JSON.pm in @inc” error: sudo apt-get install libjson-perl

Bot or webhook will use the name of the user that created it.

Mysql Databases Cleanup:

https://www.zabbix.com/forum/zabbix-help/438523-how-to-set-zabbix-to-delete-old-data?p=438544#post438544
https://www.zabbix.com/forum/zabbix-cookbook/465716-how-to-cleanup-database-disk-space-from-oversized-auditlog-database-table

First of all check that you have enough disk space and start from smallest databases.

List zabbix databases and make a decision which of them you want to reduce in size:
ls -l /var/lib/mysql/zabbix

Stop zabbix service:
/etc/init.d/zabbix-server stop

Find date unlil you want to keep history and convert it to unix format here:
https://www.unixtimestamp.com/

Reduce databases you want:
DELETE FROM alerts WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE alerts; analyze table alerts; DELETE FROM trends WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE trends; analyze table trends; DELETE FROM trends_uint WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE trends_uint; analyze table trends_uint; DELETE FROM history WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE history; analyze table history; DELETE FROM history_str WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE history_str; analyze table history_str; DELETE FROM history_text WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE history_text; analyze table history_text; DELETE FROM history_uint WHERE clock < UNIXTIMEFORMAT; OPTIMIZE TABLE history_uint; analyze table history_uint; exit

Start zabbix service:
/etc/init.d/zabbix-server start

nano /etc/zabbix/zabbix_server.conf
HousekeepingFrequency=1 MaxHousekeeperDelete=0

Set Housekeeping to 90 days in zabbix configuration

Generate UUIDs:

https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/450493-uuid-when-importing-new-items
PHP v1:
//content $content = file_get_contents('old.yaml'); $content = preg_replace_callback("|uuid: (.*)\n|U", function ($matches) { return "uuid: ".str_replace('-', '', generateUUIDv4())."\n"; }, $content);


    $fp = fopen("new.yaml", "w");

    fwrite($fp, $content);

    fclose($fp);
    function generateUUIDv4() {

        $data = random_bytes(16);
        // Set version (4) and variant (2) bits

        $data[6] = chr(ord($data[6]) & 0x0f | 0x40);

        $data[8] = chr(ord($data[8]) & 0x3f | 0x80);
        // Convert binary data to hexadecimal format

        $uuid = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
        return $uuid;

    }

echo $content
PHP v2:
# Define the file path $filePath = "C:\path\to\your\file.yaml"


# Read the file content

$content = Get-Content $filePath -Raw
# Define the regex pattern to find UUIDs

$pattern = '(?<=uuid:\s)[0-9a-f]{32}'
# Function to generate a new UUID

function New-UUID {

return [guid]::NewGuid().ToString('N')

}
# Replace all found UUIDs with new ones

$newContent = [regex]::Replace($content, $pattern, { param($match) New-UUID })
# Write the modified content back to the file

$newContent | Set-Content $filePath -NoNewline

Write-Host "UUIDs successfully replaced in file $filePath"

Or in Notepad++ with plugin PythonScript:
import uuid


def calculate(match):

    IdNew = str(uuid.uuid4()).replace("-", "")

    return '- uuid: ' + IdNew

editor.rereplace(r'- uuid: [A-Za-z0-9]+', calculate)