96 lines
2.7 KiB
Markdown
96 lines
2.7 KiB
Markdown
# Changing Platforms
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[TOC]
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This guide described how to change the
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[platform](../architecture_guide/platforms.md) used by `runsc`.
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## Prerequisites
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If you intend to run the KVM platform, you will also to have KVM installed on
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your system. If you are running a Debian based system like Debian or Ubuntu you
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can usually do this by ensuring the module is loaded, and permissions are
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appropriately set on the `/dev/kvm` device.
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If you have an Intel CPU:
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```bash
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sudo modprobe kvm-intel && sudo chmod a+rw /dev/kvm
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```
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If you have an AMD CPU:
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```bash
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sudo modprobe kvm-amd && sudo chmod a+rw /dev/kvm
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```
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If you are using a virtual machine you will need to make sure that nested
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virtualization is configured. Here are links to documents on how to set up
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nested virtualization in several popular environments:
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* Google Cloud: [Enabling Nested Virtualization for VM Instances][nested-gcp]
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* Microsoft Azure:
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[How to enable nested virtualization in an Azure VM][nested-azure]
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* VirtualBox: [Nested Virtualization][nested-virtualbox]
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* KVM: [Nested Guests][nested-kvm]
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***Note: nested virtualization will have poor performance and is historically a
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cause of security issues (e.g.
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[CVE-2018-12904](https://nvd.nist.gov/vuln/detail/CVE-2018-12904)). It is not
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recommended for production.***
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## Configuring Docker
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The platform is selected by the `--platform` command line flag passed to
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`runsc`. By default, the ptrace platform is selected. For example, to select the
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KVM platform, modify your Docker configuration (`/etc/docker/daemon.json`) to
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pass the `--platform` argument:
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```json
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{
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"runtimes": {
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"runsc": {
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"path": "/usr/local/bin/runsc",
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"runtimeArgs": [
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"--platform=kvm"
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]
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}
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}
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}
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```
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You must restart the Docker daemon after making changes to this file, typically
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this is done via `systemd`:
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```bash
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sudo systemctl restart docker
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```
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Note that you may configure multiple runtimes using different platforms. For
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example, the following configuration has one configuration for ptrace and one
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for the KVM platform:
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```json
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{
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"runtimes": {
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"runsc-ptrace": {
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"path": "/usr/local/bin/runsc",
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"runtimeArgs": [
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"--platform=ptrace"
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]
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},
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"runsc-kvm": {
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"path": "/usr/local/bin/runsc",
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"runtimeArgs": [
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"--platform=kvm"
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]
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}
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}
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}
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```
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[nested-azure]: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/nested-virtualization
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[nested-gcp]: https://cloud.google.com/compute/docs/instances/enable-nested-virtualization-vm-instances
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[nested-virtualbox]: https://www.virtualbox.org/manual/UserManual.html#nested-virt
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[nested-kvm]: https://www.linux-kvm.org/page/Nested_Guests
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