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daemon: remove kernel version check and DOCKER_NOWARN_KERNEL_VERSION

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All regular, non-EOL Linux distros now come with more recent kernels
out of the box. There may still be users trying to run on kernel 3.10
or older (some embedded systems, e.g.), but those should be a rare
exception, which we don't have to take into account.

This patch removes the kernel version check on Linux, and the corresponding
DOCKER_NOWARN_KERNEL_VERSION environment that was there to skip this
check.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-02-17 15:37:58 +01:00
parent 67b4b032f3
commit 1240f8b41d
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GPG key ID: 76698F39D527CE8C
2 changed files with 1 additions and 24 deletions
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21
daemon/daemon_unix.go
View file

@ -302,25 +302,6 @@ func adjustParallelLimit(n int, limit int) int {
return softRlimit / overhead
}
func checkKernel() error {
// Check for unsupported kernel versions
// FIXME: it would be cleaner to not test for specific versions, but rather
// test for specific functionalities.
// Unfortunately we can't test for the feature "does not cause a kernel panic"
// without actually causing a kernel panic, so we need this workaround until
// the circumstances of pre-3.10 crashes are clearer.
// For details see https://github.com/docker/docker/issues/407
// Docker 1.11 and above doesn't actually run on kernels older than 3.4,
// due to containerd-shim usage of PR_SET_CHILD_SUBREAPER (introduced in 3.4).
if !kernel.CheckKernelVersion(3, 10, 0) {
v, _ := kernel.GetKernelVersion()
if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" {
logrus.Fatalf("Your Linux kernel version %s is not supported for running docker. Please upgrade your kernel to 3.10.0 or newer.", v.String())
}
}
return nil
}
// adaptContainerSettings is called during container creation to modify any
// settings necessary in the HostConfig structure.
func (daemon *Daemon) adaptContainerSettings(hostConfig *containertypes.HostConfig, adjustCPUShares bool) error {
@ -790,7 +771,7 @@ func verifyDaemonSettings(conf *config.Config) error {
// checkSystem validates platform-specific requirements
func checkSystem() error {
return checkKernel()
return nil
}
// configureMaxThreads sets the Go runtime max threads threshold

4
daemon/daemon_windows.go
View file

@ -70,10 +70,6 @@ func setupInitLayer(idMapping *idtools.IdentityMapping) func(containerfs.Contain
return nil
}
func checkKernel() error {
return nil
}
func (daemon *Daemon) getCgroupDriver() string {
return ""
}