k3sup
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alexellis
Add support for IPv6 addresses
Why do you need this?
My node only has a reachable IPv6 address, so I tried to use k3sup with the following command:
k3sup install --context <cluster context> --user <vm user> --ip <IPv6>
Expected Behaviour
I expect this to work the same way as for an IPv4 address
Current Behaviour
I get the following output:
Running: k3sup install
2022/12/24 xx:xx:xx <IPv6>
Public IP: <IPv6>
Error: unable to connect to <IPv6> over ssh: dial tcp: address <IPv6>:22: too many colons in address
Possible Solution
Add a -6 flag for when the user wants to provide an IPv6 address. In such cases it might also be needed to specify the network adapter, like <IPv6>%eth0. This seems to be the case for ssh, but not for ping, so you'd have to check if you need this.
Steps to Reproduce
- Download k3sup
- Run
k3sup install --context <cluster context> --user <vm user> --ip <IPv6>(with everything between <> filled in ofc.)
Your Environment
- k3sup version:
0.12.12
- What Kubernetes distribution, client and server version are you using?
N/A
-
What OS or type or VM are you using for your cluster? Where is it hosted? (for
k3sup install/join): -
Operating System and version (e.g. Linux, Windows, MacOS):
Self-hosted.
Host OS: Windows 11 22H2 (build: 22621.963), using Hyper-V (Configuration version: 11.0) + multipass (for creating the VMs)
VM OS instances:
Linux <vmname> 5.15.0-56-generic #62-Ubuntu SMP Tue Nov 22 19:54:14 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
PRETTY_NAME="Ubuntu 22.04.1 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.1 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy
Do you want to work on this?
Subject to design approval, are you willing to work on a Pull Request for this issue or feature request?
I would be willing, but I don't have very much experience with GoLang.
With --host I get the same error.
I also tried --host with the <vmname>.mshome.net, but since this is from inside WSL2, the DNS doesn't resolve.
I would be also interested in this. Most of VPS servers are quite cheaper when paying for IPv6 only
I have no idea on the matter because I don't know much about the ssh library in go, but in a quick search I found this: https://github.com/kubernetes/minikube/pull/625 and https://github.com/kubernetes/minikube/pull/6110 they used to solve the same error in minikube
Thanks for your interest @Charlio99
How cheap is your IPv6-only VPS?
DO and Scaleway have VMs for 3-5 EUR/USD/mo.
Is it cheaper than that? And is that the only driver here?
Hello @alexellis,
The price difference it’s 1,7EUR/mo in the 1vCPU 2GB RAM config, the thing is that if I spin up 3 clusters with 3 workers 1 cp each, it’s 20EUR/month I could be having almost 2 clusters more for that.
Given that the main purpose of k3sup is to quickly spin up a k3s cluster, I think this is the ideal scenario.
I would be willing to help implement it but I never used go before.
I'm not in the position to test right now, since I fully changed my k8s server setup to harvester/rancher, rather than Windows+hyperv/multipass/k3sup, but I didn't test back then if ipv6 worked if you put square brackets around the address, similar to how you go to ipv6 addresses in the browser.
@Charlio99 , could you test that?
I tried that also, I did some more debugging today and it seems that github.com is a non IPv6 domain, so when get.k3s.io tried to fetch the last version, it can't...
$ nslookup github.com
Server: 2606:4700:4700::1111
Address: 2606:4700:4700::1111#53
Non-authoritative answer:
Name: github.com
Address: 140.82.121.4
I found a way around, I've created this PR, it's a simple change to the docs explaining how to do it, feel free to edit anything you want.