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Update Iptables from 1.6.2 to 1.8.x in flatcar OS version 2605.8.0 #394

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amitsingla opened this issue May 10, 2021 · 2 comments
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Update Iptables from 1.6.2 to 1.8.x in flatcar OS version 2605.8.0 #394

amitsingla opened this issue May 10, 2021 · 2 comments
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channel/alpha Issue concerns the Alpha channel. kind/enhancement Enhancement of an existing component.

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@amitsingla
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amitsingla commented May 10, 2021 •
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Current situation

Currently, we are running Kubernetes clusters on flatcar OS in production.
Kubernetes 1.16.x onwards updated their internal iptables version within the hyperkube images to 1.8.3(nft) . However the iptables version on flatcar OS remains 1.6.2.

Kube-proxy which is a component of kubernetes utilizes iptables internally for all pod routing and the version of iptables they are using 1.8.3( using --random-fully as a mandatory flag) which is incompatible with the host OS(flatcar). This is causing the iptables rules to break on the host.

Impact

We are unable to upgrade kubernetes running on flatcar OS because of iptables incompatible version with Kubernetes hyperkube image 1.16.x onwards.

Ideal future situation

Update iptables to 1.8.3 on flatcar OS.
@amitsingla amitsingla changed the title How to upgrade Iptables from 1.6.2 to 1.8.2 in flatcar OS version 2605.8.0 Update Iptables from 1.6.2 to 1.8.x in flatcar OS version 2605.8.0 May 10, 2021
@dongsupark dongsupark added kind/feature A feature request kind/enhancement Enhancement of an existing component. and removed kind/feature A feature request labels May 21, 2021
@t-lo t-lo added the channel/alpha Issue concerns the Alpha channel. label Jun 1, 2021
@jepio
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jepio commented Jan 28, 2022

This shipped in stable 3033.2.0 (https://www.flatcar.org/releases/#release-3033.2.0), please try that version.

@jepio jepio closed this as completed Jan 28, 2022
@amitsingla
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Thanks @jepio. I will test this flatcar version in coming weeks and get back to you if I have any further questions/issues.

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Labels
channel/alpha Issue concerns the Alpha channel. kind/enhancement Enhancement of an existing component.
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@t-lo @jepio @dongsupark @amitsingla