Query: Static ip allocation on multus interface for pods in a Statefulset

[lchimbili]

Hi All,

I'm looking for a solution to be able to statically allocate fixed IP addresses to multiple pod instances in a statefulset.

Static plugin allows IP allocation to a single pod instance in a Statefulset and does not support IP allocation for multiple pod instances.

Whereabouts allows dynamic allocation of IP addresses from a given IP range to multiple instances of a Statefulset. However, it is not guaranteed to assign the same IP address to a pod instance during scaling in and out and during pod recreation.

This causes a problem to certain applications which are stateful and do not expect the ip address to change. If i reserve an IP address range exclusively for the Statefulset, is it possible to achieve fixed IP address allocation to each pod instance of a statefulset from this IP range even on scaling in and out or pod recreation.

[chinglinwen]

I'm also encounter the fixed IP allocation feature, if someone consider to implement it, please consider the following case too.

I'm thinking about two cases:

1. KubeVirt machine also needs static IP for the pod, it has some clue, say a label: kubevirt.io/vm: vm-centos8.
2. using fixed mac generated by kubemacpool as clue.