From a02902eb78f937000706ec495a2a738eb407e631 Mon Sep 17 00:00:00 2001 From: Sebastiaan van Stijn Date: Tue, 16 Sep 2025 13:50:16 +0200 Subject: [PATCH 1/2] docs: deprecated: complete deprecation of kernel-memory limit Signed-off-by: Sebastiaan van Stijn --- docs/deprecated.md | 20 +++----------------- 1 file changed, 3 insertions(+), 17 deletions(-) diff --git a/docs/deprecated.md b/docs/deprecated.md index d2a76a4c14..d2c686732c 100644 --- a/docs/deprecated.md +++ b/docs/deprecated.md @@ -730,25 +730,11 @@ When using cgroups v2, the `--blkio-weight` options are implemented using Specifying kernel memory limit (`docker run --kernel-memory`) is no longer supported because the [Linux kernel deprecated `kmem.limit_in_bytes` in v5.4](https://github.com/torvalds/linux/commit/0158115f702b0ba208ab0b5adf44cae99b3ebcc7). -The OCI runtime specification now marks this option (as well as `--kernel-memory-tcp`) -as ["NOT RECOMMENDED"](https://github.com/opencontainers/runtime-spec/pull/1093), +The OCI runtime specification now marks this option as ["NOT RECOMMENDED"](https://github.com/opencontainers/runtime-spec/pull/1093), and OCI runtimes such as `runc` no longer support this option. -Docker API v1.42 and up now ignores this option when set. Older versions of the -API continue to accept the option, but depending on the OCI runtime used, may -take no effect. - -> [!NOTE] -> While not deprecated (yet) in Docker, the OCI runtime specification also -> deprecated the `memory.kmem.tcp.limit_in_bytes` option. When using `runc` as -> runtime, this option takes no effect. The Linux kernel did not explicitly -> deprecate this feature, and there is a tracking ticket in the `runc` issue -> tracker to determine if this option should be reinstated or if this was an -> oversight of the Linux kernel maintainers (see [opencontainers/runc#3174](https://github.com/opencontainers/runc/issues/3174)). -> -> The `memory.kmem.tcp.limit_in_bytes` option is only supported with cgroups v1, -> and not available on installations running with cgroups v2. This option is -> only supported by the API, and not exposed on the `docker` command-line. +The Docker API no longer handles the kernel-memory fields, and Docker CLI v29.0 +removes the `--kernel-memory` option. ### Classic Swarm and overlay networks using cluster store From f4a433f841f5f878944785f8bd13b6fb1a388082 Mon Sep 17 00:00:00 2001 From: Sebastiaan van Stijn Date: Tue, 16 Sep 2025 14:04:03 +0200 Subject: [PATCH 2/2] cli/command/container: fully deprecate --kernel-memory options The `--kernel-memory` flag was still included to allow it to be used with old API versions, but it's no longer supported by the kernel, and no longer handled by OCI runtimes, so deprecating the flags. With this patch, a deprecation warning is now produced when trying to use the option; docker run --kernel-memory 123b busybox Flag --kernel-memory has been deprecated, this option is deprecated in the kernel and no longer supported docker container create --kernel-memory 123b busybox Flag --kernel-memory has been deprecated, and no longer supported by the kernel 31fb57e2c6434490a2892031602be20d0206d3cf0fc281ea25654c46dcb62bac Note that cobra does not _fail_ the command when using deprecated options; we could make this a hard failure instead, but may not be worth the effort. Signed-off-by: Sebastiaan van Stijn --- cli/command/container/opts.go | 8 +++++--- cli/command/container/update.go | 13 +++++-------- cli/command/system/info_test.go | 2 -- .../system/testdata/docker-info-badsec.json.golden | 2 +- .../docker-info-daemon-warnings.json.golden | 2 +- .../testdata/docker-info-no-swarm.json.golden | 2 +- .../system/testdata/docker-info-plugins.json.golden | 2 +- .../testdata/docker-info-with-devices.json.golden | 2 +- .../testdata/docker-info-with-swarm.json.golden | 2 +- docs/reference/commandline/container_create.md | 1 - docs/reference/commandline/container_run.md | 1 - docs/reference/commandline/create.md | 1 - docs/reference/commandline/run.md | 1 - 13 files changed, 16 insertions(+), 23 deletions(-) diff --git a/cli/command/container/opts.go b/cli/command/container/opts.go index d1faa7a88c..c41d2de246 100644 --- a/cli/command/container/opts.go +++ b/cli/command/container/opts.go @@ -93,7 +93,6 @@ type containerOptions struct { memory opts.MemBytes memoryReservation opts.MemBytes memorySwap opts.MemSwapBytes - kernelMemory opts.MemBytes user string workingDir string cpuCount int64 @@ -303,7 +302,6 @@ func addFlags(flags *pflag.FlagSet) *containerOptions { flags.SetAnnotation("io-maxbandwidth", "ostype", []string{"windows"}) flags.Uint64Var(&copts.ioMaxIOps, "io-maxiops", 0, "Maximum IOps limit for the system drive (Windows only)") flags.SetAnnotation("io-maxiops", "ostype", []string{"windows"}) - flags.Var(&copts.kernelMemory, "kernel-memory", "Kernel memory limit") flags.VarP(&copts.memory, "memory", "m", "Memory limit") flags.Var(&copts.memoryReservation, "memory-reservation", "Memory soft limit") flags.Var(&copts.memorySwap, "memory-swap", "Swap limit equal to memory plus swap: '-1' to enable unlimited swap") @@ -327,6 +325,11 @@ func addFlags(flags *pflag.FlagSet) *containerOptions { flags.Var(copts.annotations, "annotation", "Add an annotation to the container (passed through to the OCI runtime)") flags.SetAnnotation("annotation", "version", []string{"1.43"}) + // TODO(thaJeztah): remove in next release (v30.0, or v29.x) + var stub opts.MemBytes + flags.Var(&stub, "kernel-memory", "Kernel memory limit (deprecated)") + _ = flags.MarkDeprecated("kernel-memory", "and no longer supported by the kernel") + return copts } @@ -604,7 +607,6 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con MemoryReservation: copts.memoryReservation.Value(), MemorySwap: copts.memorySwap.Value(), MemorySwappiness: &copts.swappiness, - KernelMemory: copts.kernelMemory.Value(), OomKillDisable: &copts.oomKillDisable, NanoCPUs: copts.cpus.Value(), CPUCount: copts.cpuCount, diff --git a/cli/command/container/update.go b/cli/command/container/update.go index 09f13057ca..47a35702d7 100644 --- a/cli/command/container/update.go +++ b/cli/command/container/update.go @@ -26,7 +26,6 @@ type updateOptions struct { memory opts.MemBytes memoryReservation opts.MemBytes memorySwap opts.MemSwapBytes - kernelMemory opts.MemBytes restartPolicy string pidsLimit int64 cpus opts.NanoCPUs @@ -70,12 +69,6 @@ func newUpdateCommand(dockerCLI command.Cli) *cobra.Command { flags.VarP(&options.memory, "memory", "m", "Memory limit") flags.Var(&options.memoryReservation, "memory-reservation", "Memory soft limit") flags.Var(&options.memorySwap, "memory-swap", `Swap limit equal to memory plus swap: -1 to enable unlimited swap`) - flags.Var(&options.kernelMemory, "kernel-memory", "Kernel memory limit (deprecated)") - // --kernel-memory is deprecated on API v1.42 and up, but our current annotations - // do not support only showing on < API-version. This option is no longer supported - // by runc, so hiding it unconditionally. - flags.SetAnnotation("kernel-memory", "deprecated", nil) - flags.MarkHidden("kernel-memory") flags.StringVar(&options.restartPolicy, "restart", "", "Restart policy to apply when a container exits") flags.Int64Var(&options.pidsLimit, "pids-limit", 0, `Tune container pids limit (set -1 for unlimited)`) @@ -86,6 +79,11 @@ func newUpdateCommand(dockerCLI command.Cli) *cobra.Command { _ = cmd.RegisterFlagCompletionFunc("restart", completeRestartPolicies) + // TODO(thaJeztah): remove in next release (v30.0, or v29.x) + var stub opts.MemBytes + flags.Var(&stub, "kernel-memory", "Kernel memory limit (deprecated)") + _ = flags.MarkDeprecated("kernel-memory", "and no longer supported by the kernel") + return cmd } @@ -118,7 +116,6 @@ func runUpdate(ctx context.Context, dockerCli command.Cli, options *updateOption Memory: options.memory.Value(), MemoryReservation: options.memoryReservation.Value(), MemorySwap: options.memorySwap.Value(), - KernelMemory: options.kernelMemory.Value(), CPUPeriod: options.cpuPeriod, CPUQuota: options.cpuQuota, CPURealtimePeriod: options.cpuRealtimePeriod, diff --git a/cli/command/system/info_test.go b/cli/command/system/info_test.go index 1bea26c5b7..90222a6169 100644 --- a/cli/command/system/info_test.go +++ b/cli/command/system/info_test.go @@ -49,7 +49,6 @@ var sampleInfoNoSwarm = system.Info{ }, MemoryLimit: true, SwapLimit: true, - KernelMemory: true, CPUCfsPeriod: true, CPUCfsQuota: true, CPUShares: true, @@ -235,7 +234,6 @@ func TestPrettyPrintInfo(t *testing.T) { infoWithWarningsLinux := sampleInfoNoSwarm infoWithWarningsLinux.MemoryLimit = false infoWithWarningsLinux.SwapLimit = false - infoWithWarningsLinux.KernelMemory = false infoWithWarningsLinux.OomKillDisable = false infoWithWarningsLinux.CPUCfsQuota = false infoWithWarningsLinux.CPUCfsPeriod = false diff --git a/cli/command/system/testdata/docker-info-badsec.json.golden b/cli/command/system/testdata/docker-info-badsec.json.golden index 6b145f5576..4e0f89bc86 100644 --- a/cli/command/system/testdata/docker-info-badsec.json.golden +++ b/cli/command/system/testdata/docker-info-badsec.json.golden @@ -1 +1 @@ -{"ID":"EKHL:QDUU:QZ7U:MKGD:VDXK:S27Q:GIPU:24B7:R7VT:DGN6:QCSF:2UBX","Containers":0,"ContainersRunning":0,"ContainersPaused":0,"ContainersStopped":0,"Images":0,"Driver":"overlay2","DriverStatus":[["Backing Filesystem","extfs"],["Supports d_type","true"],["Using metacopy","false"],["Native Overlay 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b/docs/reference/commandline/container_create.md index 3b812a7774..404657cbdb 100644 --- a/docs/reference/commandline/container_create.md +++ b/docs/reference/commandline/container_create.md @@ -64,7 +64,6 @@ Create a new container | `--ip6` | `string` | | IPv6 address (e.g., 2001:db8::33) | | `--ipc` | `string` | | IPC mode to use | | `--isolation` | `string` | | Container isolation technology | -| `--kernel-memory` | `bytes` | `0` | Kernel memory limit | | `-l`, `--label` | `list` | | Set meta data on a container | | `--label-file` | `list` | | Read in a line delimited file of labels | | `--link` | `list` | | Add link to another container | diff --git a/docs/reference/commandline/container_run.md b/docs/reference/commandline/container_run.md index 7a991b1c76..cd47b0eb98 100644 --- a/docs/reference/commandline/container_run.md +++ b/docs/reference/commandline/container_run.md @@ -66,7 +66,6 @@ Create and run a new container from an image | `--ip6` | `string` | | IPv6 address (e.g., 2001:db8::33) | | [`--ipc`](#ipc) | `string` | | IPC mode to use | | [`--isolation`](#isolation) | `string` | | Container isolation technology | -| `--kernel-memory` | `bytes` | `0` | Kernel memory limit | | [`-l`](#label), [`--label`](#label) | `list` | | Set meta data on a container | | `--label-file` | `list` | | Read in a line delimited file of labels | | `--link` | `list` | | Add link to another container | diff --git a/docs/reference/commandline/create.md b/docs/reference/commandline/create.md index a306821709..c4ce24fa32 100644 --- a/docs/reference/commandline/create.md +++ b/docs/reference/commandline/create.md @@ -64,7 +64,6 @@ Create a new container | `--ip6` | `string` | | IPv6 address (e.g., 2001:db8::33) | | `--ipc` | `string` | | IPC mode to use | | `--isolation` | `string` | | Container isolation technology | -| `--kernel-memory` | `bytes` | `0` | Kernel memory limit | | `-l`, `--label` | `list` | | Set meta data on a container | | `--label-file` | `list` | | Read in a line delimited file of labels | | `--link` | `list` | | Add link to another container | diff --git a/docs/reference/commandline/run.md b/docs/reference/commandline/run.md index 0e9a90ef3e..2ef7e6fc78 100644 --- a/docs/reference/commandline/run.md +++ b/docs/reference/commandline/run.md @@ -66,7 +66,6 @@ Create and run a new container from an image | `--ip6` | `string` | | IPv6 address (e.g., 2001:db8::33) | | `--ipc` | `string` | | IPC mode to use | | `--isolation` | `string` | | Container isolation technology | -| `--kernel-memory` | `bytes` | `0` | Kernel memory limit | | `-l`, `--label` | `list` | | Set meta data on a container | | `--label-file` | `list` | | Read in a line delimited file of labels | | `--link` | `list` | | Add link to another container |