mirror of https://github.com/kata-containers/kata-containers.git synced 2026-07-01 14:38:33 +00:00

Files

LandonTClipp 6005f8a499 chore(docs): Add cspell makefile target for local testing

This makes it easier to check the spellchecker is happy before
submitting it as a PR.

Signed-off-by: LandonTClipp <lclipp@coreweave.com>

2026-06-12 22:24:18 +02:00

2.5 KiB

Raw Blame History

Runtime Configuration

Drop-in Files

When kata-deploy installs Kata Containers, the base configuration files at /opt/kata/share/defaults/kata-containers should not be modified directly. Instead, use drop-in configuration files to customize settings. This approach ensures your customizations survive kata-deploy upgrades.

How Drop-in Files Work

The Kata runtime reads the base configuration file and then applies any .toml files found in the config.d/ directory alongside it. Files are processed in alphabetical order, with later files overriding earlier settings.

Base Configuration Files

The base configuration references for the Go runtime can be found here, and for the Rust runtime here.

!!! tip "What runtime implementation am I using?"

By looking at the `/opt/kata/containerd/config.d/kata-deploy.toml` file, each runtimeClass (ex. `kata-qemu-nvidia-gpu`, `kata-qemu-nvidia-gpu-runtime-rs`) is configured with a specific `runtime_path`. If this path is set to `#!toml runtime_path = "/opt/kata/bin/containerd-shim-kata-v2"` you are using the Go runtime. Otherwise if it's `#!toml runtime_path = "/opt/kata/runtime-rs/bin/containerd-shim-kata-v2"`, it's the Rust runtime.

Note that Rust will be the default runtime in Kata v4.

Creating Custom Drop-in Files

The recommended way to create custom drop-in files is to use the helm chart. Drop-in files may also be added directly to the filesystem.

To add custom settings, create a .toml file in the appropriate config.d/ directory. Use a numeric prefix to control the order of application.

Reserved prefixes (used by kata-deploy):

10-*: Core kata-deploy settings
20-*: Debug settings
30-*: Kernel parameters
50-*: Settings from the helm chart

Recommended prefixes for custom settings: 50-89

Drop-In Config Examples

Adding Custom Kernel Parameters

# SSH into the node or use kubectl exec
sudo mkdir -p /opt/kata/share/defaults/kata-containers/runtimes/qemu/config.d/
sudo cat > /opt/kata/share/defaults/kata-containers/runtimes/qemu/config.d/50-custom.toml << 'EOF'
[hypervisor.qemu]
kernel_params = "my_param=value"
EOF

Changing Default Memory Size

sudo cat > /opt/kata/share/defaults/kata-containers/runtimes/qemu/config.d/50-memory.toml << 'EOF'
[hypervisor.qemu]
default_memory = 4096
EOF

2.5 KiB Raw Blame History