Compare on-disk rules and in-memory rules (find the difference) for nftables

George Shuklin

7/7/24, 10:25 AM

I want to check that rules was loaded (e.g. ruleset in files are the same as in the kernel). I want to do it without modifying kernel rules. I can't compare files and nft list ruleset due to ordering, comments, formatting and so on.

Is there a way to see difference? Or, may be, there is a way to make nft to 'normalize' rules to match the format kernel rules are shown?

1 + 0

linux

nftables

Score:0

Server

eltrai

7/15/24, 7:47 PM

You could try using the -j option, that outputs a json instead of the human readable output with nft -j list ruleset.

You then only have to compare two json outputs, a task that can be done easily using a tool like jd.

The only issue would be how to convert the ruleset from the file to json.

+ 1

George Shuklin

7/17/24, 7:07 AM

Yes, that part (of converting config to some convergent machine-readable format) is the main topic for the question. If I can do this, I can do the same for nftables list ruleset. unfortunately, it's still open question

Elon Musk

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EN: Compare on-disk rules and in-memory rules (find the difference) for nftables

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