Does round robin DNS immediately fail over if one of the servers is down?

nop

nop?

no. round robin works a differente way, it will move traffic to one ip to the other.. randomly .. trying to move the load from both ways. it can detect if one server is down or not.

is not what is used for...wasnt never think that way.

Maybe. Look at zoneedit.com.

Its not instant but its pretty fast for most ISPS. Its fine if you only expect the ocassional outrage and dont need 100% uptime but 99.99 or something like that.

(yes, I *do* know that some ISP's cache the TTL!)

Alex

Would this be possible to setup on my server? has anyone tried it with zoneedit?


Failover & Load Balancing - monitoring, failover and load balancing services for web servers

How does your failover service work?

Failover monitoring service works when you have two or more web servers running the same (or similar) web site.
First, you need the IP address for your domain, and get it working - then you add the failover monitor.
The failover monitor watches your web server(s) by hitting a URL you specify and looking for text in the results.
When the system detects that one of them is having an error, and the others aren't, it pulls the IP address out of the list.
If none of the IP's are responding and you have a failure IP/URL defined, then it points the site to the failure IP/URL.
If the system can't get to all of the IP's then it assumes that the fault is it's own connection - and it takes no action.
If any of your IP's come back online they are restored
This effectively and safely keeps your site online - even if one of your web servers is down.

The average failure detection time is 10 minutes. This time varies depending on the speed of your site and the nature of the failure. Recovery times are faster, averaging 5 minutes

Yes, it works.

I use it for redundency between clusters in different data centers in case of network failure or loadbalancer failure (or double server failure).

However, I would say that those times are a little optimistic. In testing it takes at least 10 mins and usually more to pick up something is down.

With best wishes,

Alex

Thats great, i'll have a try with them. For me 10 min is alot better than having a server down all day.

thanks

Yip, its better than nothing.

Its also worth bearing in mind that some clients (e.g. recent versions of IE) will automatically try another IP from the pool if the one they tried first is dead. So in some cases, rrdns is instant.

Let me know if you need any further help,

Alex

Thats interesting! Is it possible to use our own branded ns servers at zoneedit? ( ns1.mydomain.com -> their ip)

they've instructed me to change the ns server to :
Nameserver 1: ns16.zoneedit.com (216.110.187.226)
Nameserver 2: ns8.zoneedit.com (206.55.124.4)

Could i just use their ip's to create ns1 & n2.mydomain.com ? not sure if that would cause any trouble later on.

Never tried that - although I think it may well work.

Just add nsx.yourdomain.tld --> the same IP as ns8.zoneedit.com and the same for ns16 and see what happens.

I personally just use the zoneedit ones but I have only set this up for clients who have small numbers of their own sites looking for 100% uptime, not resellers!

With best wishes,

Alex

Oh okay, I'll test it with a few of my own sites.