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By utilizing DNS health checks, which include TCP or UDP DNS probes, efficient server distribution and high availability can be achieved. Below are the steps for setting up the monitor with different IPs and domain names for demonstration purposes.
To optimize server load balancing using DNS health checks, follow these steps.
Configure the DNS health check monitor:
Begin by creating a new DNS health check monitor in the firewall settings.
config firewall ldb-monitor
edit "custom-dns-monitor"
set type dns
set interval 45
set port 53
set src-ip 10.2.2.5
set dns-request-domain <Fully qualified domain name to resolve for the DNS probe>
set dns-match-ip 10.2.2.100
next
end
Apply the monitor to a virtual server:
Link the DNS health check monitor to a virtual server for effective load balancing.
config firewall vip
edit "load-balanced-virtual-server"
set type server-load-balance
set extip 10.1.1.1
set extintf "wan1"
set server-type ip
set monitor "custom-dns-monitor"
set ldb-method round-robin
config realservers
edit 1
set ip 10.2.2.100
next
edit 2
set ip 10.2.2.101
next
end
Deploying a DNS health check monitor in the server load balancing setup ensures efficient network traffic distribution and improved performance.
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