fix(capture): ignore known copy failure and fix iptables issue #903
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Signed-off-by: Qingchuan Hao <[email protected]>
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We install iptables legacy on Mariner image when building the image, but when it runs on ubuntu host, the command returns empty result, which works fine on iptables nft mode. |
| nftIptablesModeAvaiable := true | ||
| legacyIptablesModeAvaiable := true | ||
| legacySaveOut, err := exec.Command("iptables-legacy-save").CombinedOutput() | ||
| if err != nil && strings.Contains(err.Error(), "command not found") { |
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What about errors with running the command? How should we handle them?
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I treat all command errors as unavailability of that mode and log the error for us to investigate.
| // Since iptables v1.8, nf_tables are introduced as an improvement of legacy iptables, but provides the same user | ||
| // interface as legacy iptables through iptables-nft command. | ||
| // based on: https://github.com/kubernetes-sigs/iptables-wrappers/blob/97b01f43a8e8db07840fc4b95e833a37c0d36b12/iptables-wrapper-installer.sh | ||
| legacySaveOut, _ := exec.Command("iptables-legacy-save").CombinedOutput() | ||
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| // when both iptables modes available, we choose the one with more rules. |
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What's the thinking behind this? Can you not list all the rules using either one of the modes? Given one is named legacy, shouldn't nft be default?
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When both modes available, we should use the one list more rules, and the one list less rules normally just return empty rules.
I am referring to https://github.com/kubernetes-sigs/iptables-wrappers/blob/97b01f43a8e8db07840fc4b95e833a37c0d36b12/iptables-wrapper-installer.sh, which is also mentioned in L377
| nftIptablesMode iptablesMode = "nft" | ||
| ) | ||
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| func obtainIptablesMode(l *log.ZapLogger) iptablesMode { |
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I think you should return unhandled errors along with mode.
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The ideas in my mind is the failed iptables rules does not break the whole capture.
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Signed-off-by: Qingchuan Hao <[email protected]>
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ping @timraymond and @anubhabMajumdar for another look. |
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LGTM on @anubhabMajumdar 's approval |
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