I installed a kubernetes cluster with k3sup on a VM on my local hypervisor and the pods are up and running. Now I wanted to add a deployment with rancher in its latest version (2.6) to manage another cluster according to this guide. But the DNS and IP return a 404 not found.
Here are some terminal commands with results that might help.
$kubectl -n cattle-system get deploy rancher
NAME READY UP-TO-DATE AVAILABLE AGE
rancher 3/3 3 3 5d3h
$kubectl get pods -n cattle-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
rancher-webhook-7f84b74ddb-44449 1/1 Running 1 5d20h 10.42.0.44 k8s-rancher <none> <none>
rancher-87d4dc99d-94hqb 1/1 Running 20 5d20h 10.42.0.42 k8s-rancher <none> <none>
rancher-87d4dc99d-b5fm2 1/1 Running 17 5d20h 10.42.0.45 k8s-rancher <none> <none>
rancher-87d4dc99d-dxmfl 1/1 Running 17 5d20h 10.42.0.41 k8s-rancher <none> <none>
The many restarts come from the missing connection to the websocket, I think.
$kubectl -n cattle-system logs rancher-87d4dc99d-94hqb
... [repeating the connection failure on all 3 pods]
2021/10/04 23:29:13 [ERROR] Failed to connect to peer wss://10.42.0.45/v3/connect [local ID=10.42.0.42]: dial tcp 10.42.0.45:443: connect: no route to host
In the container I can not reach the IP of another server.
$kubectl exec --stdin -n cattle-system --tty rancher-87d4dc99d-94hqb -- /bin/bash
[in the container]$ curl 10.42.0.45
curl: (7) Failed to connect to 10.42.0.45 port 80: No route to host
What can I do to get it working?
Thanks in advance for the help.
Best Answer
As the problem has already been resolved in the comments section, I decided to provide a Community Wiki answer just for better visibility to other community members.
The commands/steps listed on this page are really useful for checking network related issues in the cluster.
First, I recommend checking that all the required ports are open in your (host) firewall as described here.