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Podman is not compatible with nat rules
Open, Requires assessmentPublicBUG


VyOS has added container with podman. When a container is created, podman will try to use iptables to create source nat rules. However, VyOS uses nftables to create nat rules. After a nat rule is created (especially when the target is masquerade), the command iptables -t nat -L will not work. Next, if we try to add a container, podman will return error Error adding network: failed to list chains: running [/sbin/iptables -t nat -S --wait]: exit status 1: iptables v1.8.2 (nf_tables): table 'nat' is incompatible, use 'nft' tool.


Difficulty level
Unknown (require assessment)
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)

Event Timeline

@Yuanandyuan Can you reproduce it with vyos cli? Or it raw podman commands?

Port mapping will be available after that PR
I think for user-defined networks it should be some rules in vyos-cli for DNAT.

As I understand for native portmap used iptables only

To reproduce the bug, we need to add a source nat rule first.

set nat source rule 100 outbound-interface 'eth0'
set nat source rule 100 source address ''
set nat source rule 100 translation address masquerade

Then if we try to list the nat tables with iptables iptables -t nat -L, we will get error like table 'nat' is incompatible, use 'nft' tool.
Next, if we use podman to create a container sudo podman run -d ubuntu:latest, podman will return the error because it will look up nat rules with iptables.