internet , metallb , ingress , service , pod

Inbound
traffic
   ++     +---------+
   ||     |ConfigMap|
   ||     +--+------+
   ||        |
   ||        | CIDR range to provision
   ||        v
   ||     +--+----------+
   ||     |MetalLB      |               +-------+
   ||     |Load balancer|               |Ingress|
   ||     +-+-----------+               +---+---+
   ||       |                               |
   ||       |  External IP assigned         |Rules described in spec
   ||       |  to service                   |
   ||       v                               v
   ||    +--+--------------------+      +---+------------------+
   ||    |                       |      |  Ingress Controller  |
   |---->+ ingress-nginx service +----->+      (NGINX pod)     |
   +---->|                       +----->+                      |
         +-----------------------+      +----------------------+
                                                    ||
                                                    VV
                                          +-----------------+
                                          | Backend service |
                                          | (app-lb)        |
                                          |                 |
                                          +-----------------+
                                                   ||
                                                   VV
                                          +--------------------+
                                          | Backend pod        |
                                          | (httpbin)          |
                                          |                    |
                                          +--------------------+