Hi Tim,
I have a couple of different use cases actually, but at this point I'm
just trying to understand the architecture to know where my LB fits.
Options:
- haproxy/nginx outside of the cluster pointing to NodePort/LoadBalancer
ports
- haproxy/nginx inside the cluster
- Using just the Google LB and Kubernetes without haproxy/nginx
One use case involves a need for IP whitelisting and the other session
affinity, so I'm mostly just trying to straighten out my understanding
so that I can put all of these pieces together.
'Tim Hockin' via Kubernetes user discussion and Q&A
<mailto:kubernetes-users@googlegroups.com>
May 15, 2017 at 11:59 PM
You could maybe start with what you want to achieve, and what your
requirements are?
Joe Auty <mailto:joea...@gmail.com>
May 14, 2017 at 1:28 PM
Sorry for such a vague subject, but I think I need some help breaking
things down here.
I think I understand how the Google layer 7 LBs work (this diagram
helped
me: https://storage.googleapis.com/static.ianlewis.org/prod/img/750/gcp-lb-objects2.png)
, I understand NGinx and HAProxy LBs independently, and I believe I
also understand the concepts of NodePort, Ingress controllers,
services, etc.
What I don't understand is why when I research things like socket.io
architectures in Kubernetes (for example), or features like IP
whitelisting, session affinity, etc. I see people putting NGinx or
HAProxy into their clusters. It is hard for me to keep straight all of
the different levels of load balancing and their controls:
* Google backend services (i.e. Google LB)
* Kubernetes service LB
* HAProxy/NGinx
The rationale for HAProxy and NGinx seems to involve compensating for
missing features and/or bugs (kube-proxy, etc.) and it is hard to keep
straight what is a reality today and what the best path is?
Google's LBs support session affinity, and there are session affinity
Kubernetes service settings, so for starters, when and why is NGinx or
HAProxy necessary, and are there outstanding issues with tracking
source IPs and setting/respecting proper headers?
I'm happy to get into what sort of features I need if this will help
steer the discussion, but at this point I'm thinking maybe it is best
to start at a more basic level where you treat me like I'm 6 years old :)
Thanks in advance!
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