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https://github.com/NVIDIA/nvidia-container-toolkit
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74 lines
2.9 KiB
Markdown
74 lines
2.9 KiB
Markdown
# NVIDIA Container Toolkit CLI
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The NVIDIA Container Toolkit CLI `nvidia-ctk` provides a number of utilities that are useful for working with the NVIDIA Container Toolkit.
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## Functionality
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### Configure runtimes
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The `runtime` command of the `nvidia-ctk` CLI provides a set of utilities to related to the configuration
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and management of supported container engines.
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For example, running the following command:
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```bash
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nvidia-ctk runtime configure --set-as-default
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```
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will ensure that the NVIDIA Container Runtime is added as the default runtime to the default container
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engine.
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## Configure the NVIDIA Container Toolkit
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The `config` command of the `nvidia-ctk` CLI allows a user to display and manipulate the NVIDIA Container Toolkit
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configuration.
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For example, running the following command:
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```bash
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nvidia-ctk config default
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```
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will display the default config for the detected platform.
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Whereas
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```bash
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nvidia-ctk config
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```
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will display the effective NVIDIA Container Toolkit config using the configured config file, and running:
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Individual config options can be set by specifying these are key-value pairs to the `--set` argument:
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```bash
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nvidia-ctk config --set nvidia-container-cli.no-cgroups=true
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```
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By default, all commands output to `STDOUT`, but specifying the `--output` flag writes the config to the specified file.
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### Generate CDI specifications
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The [Container Device Interface (CDI)](https://tags.cncf.io/container-device-interface) provides
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a vendor-agnostic mechanism to make arbitrary devices accessible in containerized environments. To allow NVIDIA devices to be
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used in these environments, the NVIDIA Container Toolkit CLI includes functionality to generate a CDI specification for the
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available NVIDIA GPUs in a system.
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In order to generate the CDI specification for the available devices, run the following command:\
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```bash
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nvidia-ctk cdi generate
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```
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The default is to print the specification to STDOUT and a filename can be specified using the `--output` flag.
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The specification will contain a device entries as follows (where applicable):
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* An `nvidia.com/gpu=gpu{INDEX}` device for each non-MIG-enabled full GPU in the system
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* An `nvidia.com/gpu=mig{GPU_INDEX}:{MIG_INDEX}` device for each MIG-device in the system
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* A special device called `nvidia.com/gpu=all` which represents all available devices.
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For example, to generate the CDI specification in the default location where CDI-enabled tools such as `podman`, `containerd`, `cri-o`, or the NVIDIA Container Runtime can be configured to load it, the following command can be run:
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```bash
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sudo nvidia-ctk cdi generate --output=/etc/cdi/nvidia.yaml
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```
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(Note that `sudo` is used to ensure the correct permissions to write to the `/etc/cdi` folder)
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With the specification generated, a GPU can be requested by specifying the fully-qualified CDI device name. With `podman` as an exmaple:
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```bash
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podman run --rm -ti --device=nvidia.com/gpu=gpu0 ubuntu nvidia-smi -L
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```
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