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7deb49e3a6
This reverts commit 8597b343fa.
I wrote in the Kubernetes documentation:
In practice this means you need at least Linux 6.3, as tmpfs started
supporting idmap mounts in that version. This is usually needed as
several Kubernetes features use tmpfs (the service account token that is
mounted by default uses a tmpfs, Secrets use a tmpfs, etc.)
The check is wrong for several reasons:
* Pods can use userns before 6.3, they will just need to be
careful to not use a tmpfs (like a serviceaccount). MOST users
will probably need 6.3, but it is possible to use earlier kernel
versions. 5.19 probably works fine and with improvements in
the runtime 5.12 can probably be supported too.
* Several distros backport changes and the recommended way is
usually to try the syscall instead of testing kernel versions.
I expect support for simple fs like tmpfs will be backported
in several distros, but with this check it can generate confusion.
* Today a clear error is shown when the pod is created, so it's
unlikely a user will not understand why it fails.
* Returning an error if utilkernel fails to understand what
kernel version is running is also too strict (as we are
logging a warning even if it is not the expected version)
* We are switching to enabled by default, which will log a
warning on every user that runs on an older than 6.3 kernel,
adding noise to the logs.
For there reasons, let's just remove the hardcoded kernel version check.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
61 lines
3.3 KiB
Go
61 lines
3.3 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kernel
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// IPLocalReservedPortsNamespacedKernelVersion is the kernel version in which net.ipv4.ip_local_reserved_ports was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/122ff243f5f104194750ecbc76d5946dd1eec934)
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const IPLocalReservedPortsNamespacedKernelVersion = "3.16"
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// IPVSConnReuseModeMinSupportedKernelVersion is the minium kernel version supporting net.ipv4.vs.conn_reuse_mode.
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// (ref: https://github.com/torvalds/linux/commit/d752c364571743d696c2a54a449ce77550c35ac5)
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const IPVSConnReuseModeMinSupportedKernelVersion = "4.1"
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// TCPKeepAliveTimeNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_keepalive_time was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/13b287e8d1cad951634389f85b8c9b816bd3bb1e)
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const TCPKeepAliveTimeNamespacedKernelVersion = "4.5"
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// TCPKeepAliveIntervalNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_keepalive_intvl was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/b840d15d39128d08ed4486085e5507d2617b9ae1)
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const TCPKeepAliveIntervalNamespacedKernelVersion = "4.5"
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// TCPKeepAliveProbesNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_keepalive_probes was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/9bd6861bd4326e3afd3f14a9ec8a723771fb20bb)
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const TCPKeepAliveProbesNamespacedKernelVersion = "4.5"
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// TCPFinTimeoutNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_fin_timeout was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/1e579caa18b96f9eb18f4f5416658cd15f37c062)
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const TCPFinTimeoutNamespacedKernelVersion = "4.6"
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// IPVSConnReuseModeFixedKernelVersion is the kernel version in which net.ipv4.vs.conn_reuse_mode was fixed.
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// (ref: https://github.com/torvalds/linux/commit/35dfb013149f74c2be1ff9c78f14e6a3cd1539d1)
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const IPVSConnReuseModeFixedKernelVersion = "5.9"
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const TmpfsNoswapSupportKernelVersion = "6.4"
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// NFTablesKubeProxyKernelVersion is the lowest kernel version kube-proxy supports using
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// nftables mode with by default. This is not directly related to any specific kernel
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// commit; see https://issues.k8s.io/122743#issuecomment-1893922424
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const NFTablesKubeProxyKernelVersion = "5.13"
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// TCPReceiveMemoryNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_rmem was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/356d1833b638bd465672aefeb71def3ab93fc17d)
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const TCPReceiveMemoryNamespacedKernelVersion = "4.15"
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// TCPTransmitMemoryNamespacedKernelVersion is the kernel version in which net.ipv4.tcp_wmem was namespaced(netns).
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// (ref: https://github.com/torvalds/linux/commit/356d1833b638bd465672aefeb71def3ab93fc17d)
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const TCPTransmitMemoryNamespacedKernelVersion = "4.15"
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