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>
... | ... |
@@ -267,10 +267,12 @@ func checkKernel() error { |
267 | 267 |
// without actually causing a kernel panic, so we need this workaround until |
268 | 268 |
// the circumstances of pre-3.10 crashes are clearer. |
269 | 269 |
// For details see https://github.com/docker/docker/issues/407 |
270 |
+ // Docker 1.11 and above doesn't actually run on kernels older than 3.4, |
|
271 |
+ // due to containerd-shim usage of PR_SET_CHILD_SUBREAPER (introduced in 3.4). |
|
270 | 272 |
if !checkKernelVersion(3, 10, 0) { |
271 | 273 |
v, _ := kernel.GetKernelVersion() |
272 | 274 |
if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" { |
273 |
- logrus.Warnf("Your Linux kernel version %s can be unstable running docker. Please upgrade your kernel to 3.10.0.", v.String()) |
|
275 |
+ 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()) |
|
274 | 276 |
} |
275 | 277 |
} |
276 | 278 |
return nil |