DNS availability by Zabbix agent

Overview

This template is designed for dns availability monitoring by Zabbix agent via host/posh and doesn't require any external scripts.

Requirements

Zabbix version: 6.0 and higher.
Define user parameters.

Tested versions

This template has been tested on:

Macros used

Name	Description	Default
{$REQUEST}	address to check availability	`google.com`
{$RESOLVER1}	dns to check availability	`ns3-l2.nic.ru`
{$RESOLVER2}	dns to check availability	`ns4-l2.nic.ru`
{$RESOLVER3}	dns to check availability	`ns8-l2.nic.ru`
{$RESOLVER4}	dns to check availability	`ns4-cloud.nic.ru`
{$RESOLVER5}	dns to check availability	`ns8-cloud.nic.ru`

Items

Name	Description	Type	Key and additional info
DNS request	Address for resolve	Calculated	'dns.request'
DNS resolver 1 address	Resolver address	Calculated	'dns.resolver1.address'
DNS resolver 1 available	Availability of address	Zabbix agent	'dns.resolver1.available[{$REQUEST},{$RESOLVER1}]'
DNS resolver 2 address	Resolver address	Calculated	'dns.resolver2.address'
DNS resolver 2 available	Availability of address	Zabbix agent	'dns.resolver2.available[{$REQUEST},{$RESOLVER2}]'
DNS resolver 3 address	Resolver address	Calculated	'dns.resolver3.address'
DNS resolver 3 available	Availability of address	Zabbix agent	'dns.resolver3.available[{$REQUEST},{$RESOLVER3}]'
DNS resolver 4 address	Resolver address	Calculated	'dns.resolver4.address'
DNS resolver 4 available	Availability of address	Zabbix agent	'dns.resolver4.available[{$REQUEST},{$RESOLVER4}]'
DNS resolver 5 address	Resolver address	Calculated	'dns.resolver5.address'
DNS resolver 5 available	Availability of address	Zabbix agent	'dns.resolver5.available[{$REQUEST},{$RESOLVER5}]'

Triggers

Name	Expression	Severity	Dependencies and additional info
{ITEM.VALUE1} not resolved by any DNS	length(last(/DNS availability by Zabbix agent/dns.request))>0 and last(/DNS availability by Zabbix agent/dns.resolver1.available[{$REQUEST},{$RESOLVER1}],#1)<>1 and last(/DNS availability by Zabbix agent/dns.resolver2.available[{$REQUEST},{$RESOLVER2}],#1)<>1 and last(/DNS availability by Zabbix agent/dns.resolver3.available[{$REQUEST},{$RESOLVER3}],#1)<>1 and last(/DNS availability by Zabbix agent/dns.resolver4.available[{$REQUEST},{$RESOLVER4}],#1)<>1 and last(/DNS availability by Zabbix agent/dns.resolver5.available[{$REQUEST},{$RESOLVER5}],#1)<>1	High	Manual close: No
{ITEM.VALUE1} not resolved by {ITEM.VALUE2}	length(last(/DNS availability by Zabbix agent/dns.request))>0 and length(last(/DNS availability by Zabbix agent/dns.resolver1.address))>0 and last(/DNS availability by Zabbix agent/dns.resolver1.available[{$REQUEST},{$RESOLVER1}],#1)<>1	Average	Manual close: No
{ITEM.VALUE1} not resolved by {ITEM.VALUE2}	length(last(/DNS availability by Zabbix agent/dns.request))>0 and length(last(/DNS availability by Zabbix agent/dns.resolver2.address))>0 and last(/DNS availability by Zabbix agent/dns.resolver2.available[{$REQUEST},{$RESOLVER2}],#1)<>1	Average	Manual close: No
{ITEM.VALUE1} not resolved by {ITEM.VALUE2}	length(last(/DNS availability by Zabbix agent/dns.request))>0 and length(last(/DNS availability by Zabbix agent/dns.resolver3.address))>0 and last(/DNS availability by Zabbix agent/dns.resolver3.available[{$REQUEST},{$RESOLVER3}],#1)<>1	Average	Manual close: No
{ITEM.VALUE1} not resolved by {ITEM.VALUE2}	length(last(/DNS availability by Zabbix agent/dns.request))>0 and length(last(/DNS availability by Zabbix agent/dns.resolver4.address))>0 and last(/DNS availability by Zabbix agent/dns.resolver4.available[{$REQUEST},{$RESOLVER4}],#1)<>1	Average	Manual close: No
{ITEM.VALUE1} not resolved by {ITEM.VALUE2}	length(last(/DNS availability by Zabbix agent/dns.request))>0 and length(last(/DNS availability by Zabbix agent/dns.resolver5.address))>0 and last(/DNS availability by Zabbix agent/dns.resolver5.available[{$REQUEST},{$RESOLVER5}],#1)<>1	Average	Manual close: No

Discovery rules

There are no discovery rules in this template.

Item prototypes

There are no item prototypes in this template.

Define user parameters

for Linux:

tee -a /etc/zabbix/zabbix_agentd.conf > /dev/null <<'EOF'
Timeout=30
UserParameter=dns.resolver1.available[*], host $1 $2 >> /dev/null && echo 1 || echo 0
UserParameter=dns.resolver2.available[*], host $1 $2 >> /dev/null && echo 1 || echo 0
UserParameter=dns.resolver3.available[*], host $1 $2 >> /dev/null && echo 1 || echo 0
UserParameter=dns.resolver4.available[*], host $1 $2 >> /dev/null && echo 1 || echo 0
UserParameter=dns.resolver5.available[*], host $1 $2 >> /dev/null && echo 1 || echo 0
EOF

systemctl restart zabbix-agent

for Windows:

powershell.exe
$text = @"
Timeout=30
UserParameter=dns.resolver1.available[*], powershell.exe -Command "if (Resolve-DnsName -Name $1 -Type A -Server $2 -ErrorAction SilentlyContinue) {return '1'}; return '0'"
UserParameter=dns.resolver2.available[*], powershell.exe -Command "if (Resolve-DnsName -Name $1 -Type A -Server $2 -ErrorAction SilentlyContinue) {return '1'}; return '0'"
UserParameter=dns.resolver3.available[*], powershell.exe -Command "if (Resolve-DnsName -Name $1 -Type A -Server $2 -ErrorAction SilentlyContinue) {return '1'}; return '0'"
UserParameter=dns.resolver4.available[*], powershell.exe -Command "if (Resolve-DnsName -Name $1 -Type A -Server $2 -ErrorAction SilentlyContinue) {return '1'}; return '0'"
UserParameter=dns.resolver5.available[*], powershell.exe -Command "if (Resolve-DnsName -Name $1 -Type A -Server $2 -ErrorAction SilentlyContinue) {return '1'}; return '0'"
"@
$text | Out-File -Append "$env:ProgramFiles\Zabbix Agent\zabbix_agentd.conf" -Encoding "UTF8"
exit

sc stop "Zabbix Agent" && sc start "Zabbix Agent"

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