If you mean "Is this possible within the scope of Trafficserver's configuration" then the answer is "not really". Best I can think of is sitting another cache in front of those two as parents and using it to do the failover. But that doesn't make sense because it still brings you back to a single Trafficserver point of failure.


If you mean "Is this possible at all" sure it's possible, but what you're talking about is a Content Delivery System that routes users to caches based on the health of the cache servers. So whatever you build would be re-inventing Traffic Control.

From: Vasanth Mathivanan <vasanth.m@evolutiondigital.com>
Sent: Wednesday, October 10, 2018 9:30 AM
To: users@trafficserver.apache.org
Subject: RE: [EXTERNAL] Re: Failover Scenario in Trafficserver
 



if we use the  domain to points at   two traffic server ips while it makes every request round robin algorithm , so load goes to both end . our scenario is first server and second server are alive to all requests  goes to first server  if marked down first one then need every requests goes to second server . Any possible  using  only traffic server  without load balancer , router and TC ?

 

_ Vasanth

  Sent from Mail for Windows 10

 

From: Fieck, Brennan
Sent: Wednesday, October 10, 2018 8:26 PM
To: users@trafficserver.apache.org
Subject: Re: [EXTERNAL] Re: Failover Scenario in Trafficserver

 

You could use Traffic Control to do that ;)

From: Susan Hinrichs <shinrich@apache.org>
Sent: Wednesday, October 10, 2018 7:43 AM
To: users@trafficserver.apache.org
Subject: [EXTERNAL] Re: Failover Scenario in Trafficserver
 
Another option is to place several Traffic Server boxes behind a VIP, i.e. a router or load balancer that owns a common IP and distributes connections to whichever Traffic Server box is alive.  A router capable of basic ECMP routing can mostly do this.  Or a dedicated state-aware load balancer can detect that a Traffic Server box has gone done and send new connections to other servers.

On Wed, Oct 10, 2018 at 8:19 AM Fieck, Brennan <Brennan_Fieck@comcast.com> wrote:

I believe what he's saying is that this behaviour is up to the client. The client will try to connect to one traffic server, and if it fails then the client just needs to know the URL/IP of the secondary server and try that - without any direction from Traffic Server.
It makes sense, because in a failure scenario you can't rely on the Traffic Server to be working properly, so the safest thing to do is handle it yourself if possible.

From: Vasanth Mathivanan <vasanth.m@evolutiondigital.com>
Sent: Tuesday, October 9, 2018 10:26 PM
To: users@trafficserver.apache.org
Subject: [EXTERNAL] RE: Failover Scenario in Trafficserver
 

Yes , exactly how it will make on client side without traffic controller ?

could you please explain ?

_Vasanth

 

Sent from Mail for Windows 10

 

From: Patrick O'Brien
Sent: Tuesday, October 9, 2018 7:55 PM
To: users@trafficserver.apache.org
Subject: Re: Failover Scenario in Trafficserver

 

We have this configured on the client side, e.g if the client connection to trafficserver001 fails the client will attempt a connection to trafficserver002.

-patrick

On Mon, Oct 8, 2018 at 10:17 PM Vasanth Mathivanan <vasanth.m@evolutiondigital.com> wrote:

Hi All ,

 

How to switch failover traffic server to another traffic server, example we have two traffic server both points to domain (points to two ips using round robin) I had been  access only one traffic server in client side  if  fails the first traffic server  to switch another traffic server(i.e. second traffic server ) , Could you please explain  how to configure this type of scenario ?

 

 

 

_Vasanth

 

Sent from Mail for Windows 10