Jan-Frode,
Yes it can, there is an haproxy.conf file which contains the hosts that
you are proxying the traffic for. To remove a host, you would edit this
file, put a # in front of the server(s) you want taken off line and then
run the following command:
/usr/local/sbin/haproxy -f /etc/haproxy/haproxy.conf -p
/var/run/haproxy-private.pid -sf $(</var/run/haproxy-private.pid)
I placed my configuration files in /etc/haproxy, but they can be
anywhere on the system you want to put them. This command does a hot
reload of the configuration and when you go to look at your stats page,
you will see the system(s) you removed from the configuration file are
no longer showing up.
As one of my clients does updates quite frequent I wrote several scripts
that would take 1/2 of the servers off line at a time so they can deploy
the new code to those systems and then it comes back and switches it to
the next set for them to receive the new code. Once all is done all
servers are then put back into service.
Joe
Jan-Frode Myklebust wrote:
We're currently using apache mod_proxy_balancer and cookies
to make sessions sticky to backend hosts. Unfortunately
mod_proxy_balancer doesn't seem to have any way of draining
backend nodes. i.e. when we need to take one node out of
service, we'd want to schedule that a few days in advanced.
Existing sessions should keep sticking to this node as long
as they're cookies hasn't expired yet, but no new sessions
should be sent to the node being taken out of service.
Can HAProxy handle that ?
-jf
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