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Produce fatal error when running on kernel < 3.10.0

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Running on kernel versions older than 3.10 has not been
supported for a while (as it's known to be unstable).

With the containerd integration, this has become more
apparent, because kernels < 3.4 don't support PR_SET_CHILD_SUBREAPER,
which is required for containerd-shim to run.

Change the previous "warning" to a "fatal" error, so
that we refuse to start.

There's still an escape-hatch for users by setting
"DOCKER_NOWARN_KERNEL_VERSION=1" so that they can
run "at their own risk".

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2016-04-15 14:33:56 +02:00
parent 172ca1ca8c
commit 51b23d8842
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1 changed files with 3 additions and 1 deletions
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4
daemon/daemon_unix.go
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@ -267,10 +267,12 @@ func checkKernel() error {
// 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 !checkKernelVersion(3, 10, 0) {
v, _ := kernel.GetKernelVersion()
if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" {
logrus.Warnf("Your Linux kernel version %s can be unstable running docker. Please upgrade your kernel to 3.10.0.", v.String())
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