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Old 11-10-2013, 01:57 AM   #1
shaikhmastan
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Multiple DNS configured at multiple ISPs location for high availability


how to configure a Dns at different ISP's at different geographical location if we a same web server or web site for high availibility means if one server is down at one site then how that site can be accessed by client from other web server and ISP i.e i have two web server and two ISP at two different geographical location.
 
Old 11-10-2013, 03:20 AM   #2
ericson007
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Your domain points to 2 nameservers. When people request your site, other dns servers cache the address. Big companies will have servers running on independant connections, so you really should not have to worry about it too much.
 
Old 11-10-2013, 04:54 AM   #3
unSpawn
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Quote:
Originally Posted by shaikhmastan View Post
how to configure a Dns at different ISP's at different geographical location if we a same web server or web site for high availibility means if one server is down at one site then how that site can be accessed by client from other web server and ISP i.e i have two web server and two ISP at two different geographical location.
At the lowest level (DNS) a host name (like "www.") may be mapped to multiple host addresses: that's making use of Round Robin DNS. However this may not be desirable as you can not control server and client side caching and reuse of addresses. (*ericson007s "big companies" statement really has nothing to do with the size of a network provider, it's a best practice: see RFC 2182.) Another way would be to make it appear a host name has just one host address. That's done with Anycast. See the rather good netlinxinc articles for more nfo. At each site the (web?) server now becomes another Single Point of Failure so that should be addressed as well using loadbalancing (HAproxy, LVS, Ultra Monkey, etc, etc). While you're at it also look into data replication and automating at least part of maintenance like configuration management as you probably don't want to scale up and find you have to SSH into each of your machines manually.
 
Old 11-10-2013, 07:42 AM   #4
JJJCR
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Quote:
Originally Posted by shaikhmastan View Post
how to configure a Dns at different ISP's at different geographical location if we a same web server or web site for high availibility means if one server is down at one site then how that site can be accessed by client from other web server and ISP i.e i have two web server and two ISP at two different geographical location.
check out this thread:
http://www.linuxquestions.org/questi...v-conf-802024/
 
Old 11-10-2013, 08:53 AM   #5
unSpawn
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Originally Posted by JJJCR View Post
check out this thread:
http://www.linuxquestions.org/questions/solaris-opensolaris-20/multiple-domains-in-resolv-conf-802024/
That's only for searching and resolving domains locally...
 
Old 11-10-2013, 05:34 PM   #6
ericson007
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@unSpawn: the netlinxinc article is actually quite good!
 
Old 11-10-2013, 06:56 PM   #7
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Moved: This thread is more suitable in <Linux-General> and has been moved accordingly to help your thread/question get the exposure it deserves.
 
  


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