Rancher shows Bad Gateway when Suse Firewall is active

Rancher 2.x
1

Hi everybody,
I have a Rancher single Node on k3s running on opensuse 15.5. As long as the opensuse firewall is active I get on every URL (Rancher GUI or Nextcloud for example) the Error “Bad Gateway”. I opened every port in the firewall that is listed in the Port Requirements (Port Requirements | Rancher), but the Problem still exists. When i disable the firewall everything works fine.
Can anyone help me please?
My environment:
opensuse 15.5
Rancher v.2.8.1
kubernetes: v1.27.10+k3s1

Best Regards,
Bernd

2

Does “single node k3s” means manual k3s installation + rancher via helm? or is it a docker install, then the web ui port that needs to be opened is the one that you mapped in your docker invocation ( the requirements page just mentions 443, but actually measn any port you did use for the mapping.

3

Hi, Rancher and k3s is not running in a Docker Container. I´ve made the Helm CLI Installation.

Regards,
Bernd

4

Ok, then you should see wich port is blocked in the firewall logs. And of course you need to make sure the firewall does not interfere with the iptables /netfilter rules k3s is installing.
See also Einstellung Firewall K3S - iptables-nft - vServer / Server / KVM-Server - netcup Kundenforum

5

Hi thank you for the link. Exactly that was the Problem because of firewalld in opensuse.