With a solution per harvester/harvester-installer#1035, it works.

harv21:~ # cat /oem/99_cni_reset.yaml 
name: "reset container dhcp leases"
stages:
  initramfs:
    - name: "reset container dhcp leases"
      commands:
      - rm -rf /var/lib/cni/networks/k8s-pod-network
harv21:~ # ls /var/lib/cni/networks/k8s-pod-network/ -alth
ls: cannot access '/var/lib/cni/networks/k8s-pod-network/': No such file or directory
harv21:~ # 

after some time:

harv21:~ # ls /var/lib/cni/networks/k8s-pod-network/ -alth
total 228K
drwxr-xr-x 2 root root 4.0K Apr 28 20:13 .
-rw------- 1 root root   70 Apr 28 20:13 10.52.0.56
-rw------- 1 root root   10 Apr 28 20:13 last_reserved_ip.0
-rw------- 1 root root   70 Apr 28 20:13 10.52.0.55
-rw------- 1 root root   70 Apr 28 20:13 10.52.0.54
-rw------- 1 root root   70 Apr 28 20:13 10.52.0.53
-rw------- 1 root root   70 Apr 28 20:12 10.52.0.52
-rw------- 1 root root   70 Apr 28 20:12 10.52.0.51
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.50
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.48
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.49
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.47
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.46
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.45
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.44
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.43
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.42
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.41
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.39
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.38
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.37
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.36
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.35
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.34
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.32
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.33
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.31
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.30
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.29
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.28
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.27
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.26
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.25
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.24
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.21
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.22
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.23
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.20
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.19
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.18
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.17
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.16
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.15
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.14
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.12
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.13
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.11
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.10
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.9
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.8
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.7
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.6
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.5
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.4
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.3
-rw------- 1 root root   70 Apr 28 20:11 10.52.0.2
drwxr-xr-x 3 root root 4.0K Apr 28 20:11 ..
-rwxr-x--- 1 root root    0 Apr 28 20:11 lock
harv21:~ #

[backport v1.4] [BUG] The cni pod network cache cleanup does not work in all cases #8152

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