DNS (domain name system) does not allow multiple A records in a fail
over fashion. There are also no priorities with A records. If you create
multiple A records, the dns will resolve your domain in a round-robin
fashion to all IPs. What this means is that if you have say 2 A records
for your domain, and host your domain at two locations, some clients
will see site at one location and others on the second one, at the same
time, depending on what A record (resolution) they received.
To setup a fail over requires much more than that. It involves
clustering (expensive and reliable) OR automatic DNS update through some
script (cheaper solution and slow).
Example of clustering is that you have one device (e.g. a server)
that handles the routing of traffic to which ever server is online. If
one goes off, it starts redirecting the traffic to other. http://www.linux-ha.org is one such project.
Second solution can be that if main server goes off, the DNS hosted
at 3rd location updates the A record (which should have a low refresh
time e.g. a few minutes). Depending on how fast the dns propagates, the
traffic will start flowing to backup/second location. This solution
requires custom scripting or 3rd party dns provider.
- 76 Users Found This Useful
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