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# k3sa
adamant-kite-43734
10/04/2023, 5:57 PMThis message was deleted.
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gentle-midnight-93731
10/04/2023, 7:41 PMI added this to the initial install command :
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--flannel-iface ens10 --node-ip 10.1.1.1gentle-midnight-93731
10/04/2023, 7:41 PMAlso - remember to install https://github.com/hetznercloud/csi-driver
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blue-angle-72433
10/04/2023, 7:51 PMThanks for responding. Lots of questions based on your response 🙂
1. So you did not have to set --flannel-backend? It worked with the default vxlan option?
2. Shouldn't the interface be the VLAN interface? (which they suggest calling something like "ens10.4000"
3. What about MTU settings? The VLAN has to be 1400, but the interfaces seen by the pods is 1500.
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gentle-midnight-93731
10/04/2023, 7:54 PMYou are on Hetzner cloud nodes, right ?
gentle-midnight-93731
10/04/2023, 7:56 PMI am on CX41 nodes, and attaching an internal network showed up as interface ens10. It worked with the options above.
gentle-midnight-93731
10/04/2023, 7:58 PMIf using robot nodes, I added /etc/netplan/01-netcfg.yaml (setting mtu to 1400 on vlan 4001) and used
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--flannel-iface enp7s0.4001👍 1
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blue-angle-72433
10/04/2023, 8:23 PMThese are dedicated root servers using robot.
Setting --flannel-iface to the vlan does make the pods get MTU 1400. How many of these options do you also have to specify for the agent?
blue-angle-72433
10/04/2023, 8:24 PMMy VLAN is working as it should (I think) at least I can do curl back from one server to another just fine (as well as ping/ssh), its just the CNI that is messed up I think.
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gentle-midnight-93731
10/04/2023, 8:27 PMAh - I missed the "bare metal" part of your post. Please ignode the first part. I only had one robot server - no agents.
The full list of install options was :
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INSTALL_K3S_EXEC="server --node-ip 10.0.1.2 --flannel-iface enp7s0.4001"b
blue-angle-72433
10/04/2023, 8:29 PMOk thanks. So was this a single-node cluster, or did you connect it with hcloud CX instances as agents? And did you then pass --flannel-iface when setting up the agents?
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gentle-midnight-93731
10/04/2023, 8:49 PMThis is from my working notes. But I am pretty sure all I had to do was to add --flannel-iface and --node-ip on both the servers and agents. Best of luck 🙂
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blue-angle-72433
10/04/2023, 8:49 PMThanks for your help, I might just need that luck :)
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