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Require kernel 5.13 for nftables kube-proxy

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This commit is contained in:
Dan Winship 2024-01-30 17:32:04 -05:00
parent 912eca9e8b
commit 505f6833d9
2 changed files with 23 additions and 0 deletions
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18
pkg/proxy/nftables/proxier.go
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@ -40,6 +40,7 @@ import (
discovery "k8s.io/api/discovery/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/version"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/events"
"k8s.io/klog/v2"
@ -50,6 +51,7 @@ import (
"k8s.io/kubernetes/pkg/proxy/metrics"
proxyutil "k8s.io/kubernetes/pkg/proxy/util"
"k8s.io/kubernetes/pkg/util/async"
utilkernel "k8s.io/kubernetes/pkg/util/kernel"
utilexec "k8s.io/utils/exec"
netutils "k8s.io/utils/net"
"k8s.io/utils/ptr"
@ -286,6 +288,22 @@ func getNFTablesInterface(ipFamily v1.IPFamily) (knftables.Interface, error) {
return nil, err
}
// Likewise, we want to ensure that the host filesystem has nft >= 1.0.1, so that
// it's not possible that *our* rules break *the system's* nft. (In particular, we
// know that if kube-proxy uses nft >= 1.0.3 and the system has nft <= 0.9.8, that
// the system nft will become completely unusable.) Unfortunately, we can't easily
// figure out the version of nft installed on the host filesystem, so instead, we
// check the kernel version, under the assumption that the distro will have an nft
// binary that supports the same features as its kernel does, and so kernel 5.13
// or later implies nft 1.0.1 or later. https://issues.k8s.io/122743
kernelVersion, err := utilkernel.GetVersion()
if err != nil {
return nil, fmt.Errorf("could not check kernel version: %w", err)
}
if kernelVersion.LessThan(version.MustParseGeneric(utilkernel.NFTablesKubeProxyKernelVersion)) {
return nil, fmt.Errorf("kube-proxy in nftables mode requires kernel %s or later", utilkernel.NFTablesKubeProxyKernelVersion)
}
return nft, nil
}

5
pkg/util/kernel/constants.go
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@ -49,3 +49,8 @@ const IPVSConnReuseModeFixedKernelVersion = "5.9"
const UserNamespacesSupportKernelVersion = "6.3"
const TmpfsNoswapSupportKernelVersion = "6.4"
// NFTablesKubeProxyKernelVersion is the lowest kernel version kube-proxy supports using
// nftables mode with by default. This is not directly related to any specific kernel
// commit; see https://issues.k8s.io/122743#issuecomment-1893922424
const NFTablesKubeProxyKernelVersion = "5.13"