# I want to join VMs from another cloud to my cluster.(Flannel issue)

**URL:** <https://discuss.kubernetes.io/t/i-want-to-join-vms-from-another-cloud-to-my-cluster-flannel-issue/27406>\
**Category:** General Discussions\
**Tags:** network\
**Created:** [March 10, 2024, 5:30pm UTC](https://discuss.kubernetes.io/t/i-want-to-join-vms-from-another-cloud-to-my-cluster-flannel-issue/27406 "2024-03-10T17:30:19Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![earlgrey02](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/earlgrey02/32/14485_2.png) [@earlgrey02](https://discuss.kubernetes.io/u/earlgrey02)\
**Post date:** [March 10, 2024, 5:30pm UTC](https://discuss.kubernetes.io/t/i-want-to-join-vms-from-another-cloud-to-my-cluster-flannel-issue/27406/1 "2024-03-10T17:30:19Z")

</div>

I want to join nodes belonging to networks different from Kubernetes to a cluster.  
For example, two nodes are VMs from Kakao Cloud and the new node you want to join is a VM from GCP. The master node used kubeadm init using a public IP.

```auto
k get node -o wide       
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
controlplane Ready control-plane 3h22m v1.28.2 172.10.0.253 <none> Ubuntu 22.04.2 LTS 5.15.0-100-generic containerd://1.6.28
node01 Ready <none> 3h6m v1.28.2 172.10.1.101 <none> Ubuntu 22.04.2 LTS 5.15.0-100-generic containerd://1.6.28
node02 Ready <none> 25m v1.28.2 10.172.0.5 <none> Ubuntu 20.04.6 LTS 5.15.0-1053-gcp containerd://1.6.28

```

  

Although we succeeded in joining the VM in GCP, we confirmed that the kube-flannel in the VM in GCP was continuously generating errors and being regenerated.

```auto
k get pods -n kube-flannel -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-flannel-ds-jgl6n 0/1 CrashLoopBackOff 8 (99s ago) 26m 10.172.0.5 node02 <none> <none>
kube-flannel-ds-nzb4v 1/1 Running 0 3h7m 172.10.1.101 node01 <none> <none>
kube-flannel-ds-v29hf 1/1 Running 0 3h16m 172.10.0.253 controlplane <none> <none>

```

  

When I used the ip link on a VM in GCP, network interfaces such as flannel.1 and cni0 were not visible. How do I do this?

```auto
root@node02:/# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1460 qdisc mq state UP group default qlen 1000
    link/ether 42:01:0a:b2:00:05 brd ff:ff:ff:ff:ff:ff
    inet 10.172.0.5/32 scope global dynamic ens4
       valid_lft 2878sec preferred_lft 2878sec
    inet6 fe80::4001:aff:feb2:5/64 scope link 
       valid_lft forever preferred_lft forever

```

### Cluster information:

Kubernetes version: v1.28.2  
Cloud being used: Kakao Cloud & GCP  
Installation method: kubeadm  
Host OS: Ubuntu 22.04.2 LTS  
CNI and version: Flannel 0.24.3  
CRI and version: Containerd 1.6.28