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Asked: 2024-09-25T18:44:26+05:30 In:

I am encountering an issue with K3s where the connection to the server at localhost:8080 is being refused. Has anyone experienced this problem and can offer guidance on potential solutions or troubleshooting steps?

I’ve been diving into K3s recently, and I’ve hit a bit of a wall that I could really use some help with. So here’s the situation: I’m trying to connect to my K3s server, but every time I attempt it, I get this annoying error saying the connection to the server at `localhost:8080` is being refused. It’s driving me a bit crazy!

I set everything up following some guides I found online, and I’ll admit, I’m still relatively new to Kubernetes in general. I thought I had a good handle on it, but this hiccup has got me scratching my head. It’s as if my K3s server has just decided to ghost me.

I’ve checked to make sure that the K3s service is up and running. I even tried restarting the service using `systemctl restart k3s`, but that didn’t change anything. I also took a peek at the logs using `journalctl -u k3s` to see if there were any glaring errors that might give me a clue, but it all looks pretty normal – at least, as far as I can tell.

My first thoughts were about any firewall settings maybe blocking the port? But I’ve double-checked that and it seems like `localhost:8080` should be accessible. I also verified that I’m using the right kubeconfig file – or at least, I think I am! I have a few different K8s setups on my machine, so it’s possible I might be mixing them up a bit.

Has anyone else run into this issue with K3s? I’m all ears for any ideas or troubleshooting steps you might suggest. I’d love to hear your experiences, what you did to get past it, or any commands I might be overlooking. I really want to get this working so I can continue messing around with Kubernetes. Thanks in advance for any help!

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    2 Answers



    1. K3s Connection Issue

      K3s Connection Issue Help!

      It sounds super frustrating! I’ve been there too when I first started with K3s. Here are a few things you might want to check:

      • Check if K3s is running: You can run systemctl status k3s to see if the service is active. If for some reason it’s not running, you might want to look into that first!
      • Kubeconfig File: Double-check the kubeconfig file you’re using. It should usually be located in /etc/rancher/k3s/k3s.yaml. You can also set the context to use this file with export KUBECONFIG=/etc/rancher/k3s/k3s.yaml.
      • Connection Port: Normally, K3s listens on localhost:6443 instead of localhost:8080. You might want to check if you’re connecting to the right port! You can also use kubectl config view to see which server your kubeconfig is pointing to.
      • Network or Firewall Issues: If you have a firewall running, check to ensure it’s not blocking your ports. But since you’re connecting to localhost, this is less likely to be the issue.
      • Logs are Key: You mentioned checking the logs, which is great! Look for any signs of errors or crashes. Sometimes the issues are subtle, so even warnings can be helpful.

      If all else fails, try reinstalling K3s completely. It might feel like starting over, but sometimes that’s the easiest way to sort out configuration issues.

      Hopefully, something here helps you out! Keep us posted on your progress!



    2. The issue you’re experiencing with K3s not accepting connections on `localhost:8080` could stem from several common factors. First, ensure that the K3s service is actually running as expected. You can confirm this by executing the command sudo systemctl status k3s. If it’s active and running, the next step is to check the default kubeconfig file, usually located at /etc/rancher/k3s/k3s.yaml. Make sure that your KUBECONFIG environment variable points to this file. The standard command for setting this is export KUBECONFIG=/etc/rancher/k3s/k3s.yaml. Additionally, it’s worth inspecting if your user has sufficient permissions to access the kubeconfig file. The user should ideally belong to a group that has `kubectl` access.

      If everything seems normal with the K3s service and the kubeconfig file, the problem could also be related to network configurations, especially if you have multiple Kubernetes environments. Ensure that no other services are using port 8080, as this could inadvertently block K3s from binding to it. If you suspect firewall rules, check your firewall settings with sudo iptables -L or sudo ufw status (if you’re using UFW) to ensure that nothing is inadvertently blocking localhost. Finally, try accessing the K3s API server directly from a terminal session using curl to see if it provides a more specific error message: curl -i http://localhost:8080/version. This can help narrow down if it’s a connection issue or something related to your kubeconfig setup.


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