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I usually do one of the two:
You can use the commandline ipvsadm-command to get a list of all nodes and
manipulate (add/remove) nodes.
Use it to remove ad later add the node again. This will not influence any other
nodes of the configuration.
If you get totally lost, just restart ldirectord and it will come back up with
the regular configuration.
Or, as second option, use the http negotiation mechanism that uses a string
comparison of a certain URL against an expected string
pattern.
Have it check against a dummy html page and put a flag in there that ldirectord
checks against to determine if the host is supposed
to be in the pool or not. Modify the flag manually to take the node out.
MARK
> -----Original Message-----
> From: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf
> Of Jacob Smullyan
> Sent: Monday, February 13, 2006 12:48 PM
> To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Subject: temporarily removing a server from rotation
>
>
> Hi --
>
> It is a tribute to lvs that I've forgotten most of what I once knew
> about it, because I set up LVS-DR with keepalived about three years
> ago and it has run without a hiccup ever since. As a result, I'm
> rusty, so forgive me if this is a stupid or frequently asked question.
>
> How should I go about taking a server temporarily out of rotation?
> Since I am using keepalived, I know I can simply turn off the service
> it depends on -- but in fact I want to replace that service with a new
> application on the same port (which will go live a few minutes/hours
> later). I am aware of some alternatives:
>
> * configure keepalived's health check to rely on some aspect on the
> old application,
> then swap the configuration when I want to go live with the new
> application.
> * temporarily run the new application on a different ip.
> * simply comment out that realserver in keepalived.conf temporarily,
> or add a healthcheck
> that will never be satisfied.
> * directly delete the ipvsadm config for that server (but what about
> the backup director, and
> how if at all will keepalived interfere with that?)
> * get a job more suitable for a dim-witted person like myself.
>
> But all these are workarounds; what I really want is to tell the
> director (or keepalived), "retain all configuration, but temporarily
> drop this realserver until I remove the block". Is there a way to do
> that?
>
> Cheers,
>
> Jacob Smullyan
>
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