Re: cf platform upgrade with 100% uptime for apps

Gwenn Etourneau


Haproxy is clearly a SPOF here, that's why in production most of the people
use a load balancer with active health checking.


On Mon, Mar 14, 2016 at 3:07 PM, Kayode Odeyemi <dreyemi(a)> wrote:

Stephen, I think this is only possible if you deployed CF unto multiple
DCs. Same configuration, multiple DNSs

On Mon, Mar 14, 2016 at 3:55 AM, Stephen Byers <smbyers(a)> wrote:

Agree. But the haproxy fronts the router so any client that is pinned to
the haproxy that is taken down will not make it to the router until its DNS
ttl is reached and it resolves to the other haproxy ip and even that may
not happen if this is a DNS round robin configuration.

I could be missing something?

On Sun, Mar 13, 2016, 8:44 PM Ben R <vagcom.ben(a)> wrote:

I think one (or two) of the routers help in this situation even if one
haproxy is out of service.


On Sun, Mar 13, 2016 at 6:32 PM, Stephen Byers <smbyers(a)>

Will that solve the problem? BOSH will only take one haproxy out of
service at a time but those clients that resolved the DNS name to the IP of
the haproxy that is taken out of service for upgrade will be impacted,


On Sun, Mar 13, 2016, 8:25 PM Amit Gupta <agupta(a)> wrote:

In your case, 2 HAProxys with DNS configured to point at both.

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