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Check minimum kernel memory limit to be 4M

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Fixes: #18405

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
This commit is contained in:
Qiang Huang 2015-12-09 14:26:41 +08:00
parent c8ed1492bf
commit 2347f98003
4 changed files with 19 additions and 4 deletions
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7
daemon/daemon_unix.go
View file

@ -40,6 +40,8 @@ const (
linuxMinCPUShares = 2
linuxMaxCPUShares = 262144
platformSupported = true
// It's not kernel limit, we want this 4M limit to supply a reasonable functional container
linuxMinMemory = 4194304
)
func getBlkioWeightDevices(config *runconfig.HostConfig) ([]*blkiodev.WeightDevice, error) {
@ -194,7 +196,7 @@ func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *runconfig.HostC
}
// memory subsystem checks and adjustments
if hostConfig.Memory != 0 && hostConfig.Memory < 4194304 {
if hostConfig.Memory != 0 && hostConfig.Memory < linuxMinMemory {
return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB")
}
if hostConfig.Memory > 0 && !sysInfo.MemoryLimit {
@ -238,6 +240,9 @@ func verifyPlatformContainerSettings(daemon *Daemon, hostConfig *runconfig.HostC
logrus.Warnf("Your kernel does not support kernel memory limit capabilities. Limitation discarded.")
hostConfig.KernelMemory = 0
}
if hostConfig.KernelMemory > 0 && hostConfig.KernelMemory < linuxMinMemory {
return warnings, fmt.Errorf("Minimum kernel memory limit allowed is 4MB")
}
if hostConfig.KernelMemory > 0 && !checkKernelVersion(4, 0, 0) {
warnings = append(warnings, "You specified a kernel memory limit on a kernel older than 4.0. Kernel memory limits are experimental on older kernels, it won't work as expected and can cause your system to be unstable.")
logrus.Warnf("You specified a kernel memory limit on a kernel older than 4.0. Kernel memory limits are experimental on older kernels, it won't work as expected and can cause your system to be unstable.")

1
docs/reference/api/docker_remote_api.md
View file

@ -102,6 +102,7 @@ This section lists each version from latest to oldest. Each listing includes a
* `GET /version` now returns the `BuildTime` field in RFC3339Nano format to make it
consistent with other date/time values returned by the API.
* `AuthConfig` now supports a `registrytoken` for token based authentication
* `POST /containers/create` now has a 4M minimum value limit for `HostConfig.KernelMemory`
### v1.21 API changes

4
docs/reference/run.md
View file

@ -619,10 +619,10 @@ container:
| Option | Description |
| -------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- |
| `-m`, `--memory=""` | Memory limit (format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. |
| `-m`, `--memory=""` | Memory limit (format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. Minimum is 4M. |
| `--memory-swap=""` | Total memory limit (memory + swap, format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. |
| `--memory-reservation=""` | Memory soft limit (format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. |
| `--kernel-memory=""` | Kernel memory limit (format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. |
| `--kernel-memory=""` | Kernel memory limit (format: `<number>[<unit>]`). Number is a positive integer. Unit can be one of `b`, `k`, `m`, or `g`. Minimum is 4M. |
| `-c`, `--cpu-shares=0` | CPU shares (relative weight) |
| `--cpu-period=0` | Limit the CPU CFS (Completely Fair Scheduler) period |
| `--cpuset-cpus=""` | CPUs in which to allow execution (0-3, 0,1) |

11
integration-cli/docker_cli_run_unix_test.go
View file

@ -169,10 +169,19 @@ func (s *DockerSuite) TestRunWithKernelMemory(c *check.C) {
out, err := inspectField("test1", "HostConfig.KernelMemory")
c.Assert(err, check.IsNil)
c.Assert(out, check.Equals, "52428800")
}
func (s *DockerSuite) TestRunWithInvalidKernelMemory(c *check.C) {
testRequires(c, kernelMemorySupport)
out, _, err := dockerCmdWithError("run", "--kernel-memory", "2M", "busybox", "true")
c.Assert(err, check.NotNil)
expected := "Minimum kernel memory limit allowed is 4MB"
c.Assert(out, checker.Contains, expected)
out, _, err = dockerCmdWithError("run", "--kernel-memory", "-16m", "--name", "test2", "busybox", "echo", "test")
expected := "invalid size"
c.Assert(err, check.NotNil)
expected = "invalid size"
c.Assert(out, checker.Contains, expected)
}