How pods manage the IP address?

[rthamrin]

I would like to know how exactly pods get an IP address, and how they distribute the pods to agent and master.

I have 1 master node and 2 agent nodes. my pods all are running well, but I am curious how the pods get an IP address.

some pods have IP cluster nodes, meanwhile, some have an ethernet IP address. I run Nginx and Metallb for the load balancer. Disable Taefik and Klipper.

if we can see the agent-03 has 2 IP addresses run on

root:/# kubectl get pods -A -o wide

ingress          nginx-dep-fdcd8sdfs-gj5gff                 1/1     Running   0          46h     10.42.0.80      master          <none>           <none>

ingress          nginx-dep-fdcd8sdfs-dn80n                1/1     Running   0          46h     10.42.0.79      master          <none>           <none>

ingress          nginx-doc-7cc85c5899-sdh55              1/1     Running   0          44h     10.42.0.82      master          <none>           <none>

ingress          nginx-doc-7cc85c5899-gjghs               1/1     Running   0          44h     10.42.0.83      master          <none>           <none>

prometheus       prometheus-node-exporter-6tl8t    1/1     Running   0          47h     192.168.1.3   agent-03    <none>           <none>

ingress          ingress-controller-nginx-ingress-controller-rqs8n            1/1     Running   5          47h     192.168.1.3    agent-03   <none>           <none>

prometheus       prometheus-kube-prometheus-operator-68fbcb6d67-8qsnf       1/1     Running   1          46h     10.42.2.52     agent-03    <none>           <none>

ingress          nginx-doc-7cc85c5899-b77j6                1/1     Running   0          43h     10.42.2.57      agent-03    <none>           <none>

metallb-system   speaker-sk4pz                                 1/1     Running   1          47h     192.168.1.3    agent-03   <none>           <none>

in my pod's shows agent-03 run Nginx-doc use IP cluster while metal use IP ethernet, or it depends on what service are running in pods?

ingress          nginx-doc-7cc85c5899-b77j6                  1/1     Running   0          43h     10.42.2.57      agent-03    <none>           <none>

metallb-system   speaker-sk4pz                                   1/1     Running   1          47h     192.168.1.3    agent-03   <none>           <none>

and I can see master has 2 Nginx-doc pods running, which means when I deploy 3 Nginx-doc one agent will not get any Nginx-doc because it has been taken by the master. and it is not divided equally.

If I miss configuring which part do I need to fix.