- Red Hat Enterprise Linux
- How to set up DNS Round Robin for load sharing or fault tolerance
Round Robin DNS is a technique in which load balancing is performed by a DNS server instead of a strictly dedicated machine. A DNS record has more than one value IP address. When a request is made to the DNS server that serves this record, the answer it gives alternates for each request.
For instance, in order to distribute requests between three web servers, make following changes in DNS zone files.
; zone file fragment www IN A 192.168.0.7 www IN A 192.168.0.8 www IN A 192.168.0.9 ; or use this format, which gives exactly the same result www IN A 192.168.0.7 IN A 192.168.0.8 IN A 192.168.0.9
On RHEL 6:
# service named restart
On RHEL 7:
# systemctl restart named
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