# CIDR change fails

**URL:** <https://discuss.kubernetes.io/t/cidr-change-fails/17426>\
**Category:** microk8s\
**Created:** [September 14, 2021, 5:38pm UTC](https://discuss.kubernetes.io/t/cidr-change-fails/17426 "2021-09-14T17:38:41Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![jerrac](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/jerrac/32/8570_2.png) [@jerrac](https://discuss.kubernetes.io/u/jerrac)\
**Post date:** [September 14, 2021, 5:38pm UTC](https://discuss.kubernetes.io/t/cidr-change-fails/17426/1 "2021-09-14T17:38:41Z")

</div>

Hey all,

I’ve been trying to change the cidr of my microk8s instance to 192.168.0.0/16. (Our internal network uses 10.0.0.0/8.) But when I get to the point of checking that it’s worked, well, it hasn’t worked.

I’m following the official docs here: [MicroK8s - Changing the pods CIDR in a MicroK8s cluster](https://microk8s.io/docs/change-cidr)

This is on a Ubuntu 18.04 server. I’m trying to change directly after installing microk8s for the first time.

Here’s a pastebin of my output: [failedcidrchange - Pastebin.com](https://pastebin.com/eND8n4dt)

Any ideas?

Thanks in advance!

---

<div class="post-metadata">

**Author:** ![jerrac](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/jerrac/32/8570_2.png) [@jerrac](https://discuss.kubernetes.io/u/jerrac)\
**Post date:** [September 14, 2021, 6:27pm UTC](https://discuss.kubernetes.io/t/cidr-change-fails/17426/2 "2021-09-14T18:27:39Z")

</div>

I don’t get it. I tried 172.16.30.0/24 on a different node. It worked.

```auto
systemuser@microk8snode2:~$ microk8s kubectl get po -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-node-w6tc2 1/1 Running 0 2m11s 10.225.225.8 microk8snode2 <none> <none>
kube-system metrics-server-8bbfb4bdb-546db 1/1 Running 0 2m10s 172.16.30.129 microk8snode2 <none> <none>
kube-system calico-kube-controllers-f7868dd95-2b8wg 1/1 Running 0 2m10s 172.16.30.133 microk8snode2 <none> <none>
kube-system dashboard-metrics-scraper-78d7698477-hbhpn 1/1 Running 0 2m10s 172.16.30.130 microk8snode2 <none> <none>
kube-system kubernetes-dashboard-85fd7f45cb-f8pzj 1/1 Running 0 2m10s 172.16.30.131 microk8snode2 <none> <none>
kube-system coredns-7f9c69c78c-9hdfv 1/1 Running 0 2m10s 172.16.30.132 microk8snode2 <none> <none>

```

Any idea why?