docker
Overview
The Docker driver allows you to install Kubernetes into an existing Docker install. On Linux, this does not require virtualization to be enabled.
Requirements
- Install Docker 18.09 or higher (20.10 or higher is recommended)
- amd64 or arm64 system.
- If using WSL complete these steps first
Usage
Start a cluster using the docker driver:
minikube start --driver=docker
To make docker the default driver:
minikube config set driver docker
Requirements
- Docker 20.10 or higher, see https://rootlesscontaine.rs/getting-started/docker/
- Cgroup v2 delegation, see https://rootlesscontaine.rs/getting-started/common/cgroup2/
- Kernel 5.11 or later (5.13 or later is recommended when SELinux is enabled), see https://rootlesscontaine.rs/how-it-works/overlayfs/
Usage
Start a cluster using the rootless docker driver:
dockerd-rootless-setuptool.sh install -f
docker context use rootless
minikube start --driver=docker --container-runtime=containerd
Unlike Podman driver, it is not necessary to set the rootless property of minikube (minikube config set rootless true).
When the rootless property is explicitly set but the current Docker host is not rootless, minikube fails with an error.
The --container-runtime flag must be set to “containerd” or “cri-o”. “containerd” is recommended.
Special features
- Cross platform (linux, macOS, Windows)
- No hypervisor required when run on Linux
- Experimental support for WSL2 on Windows 10
Known Issues
-
The following Docker runtime security options are currently unsupported and will not work with the Docker driver (see #9607):
-
On macOS, containers might get hung and require a restart of Docker for Desktop. See docker/for-mac#1835
-
The
ingress, andingress-dnsaddons are currently only supported on Linux. See #7332 -
On WSL2 (experimental - see #5392), you may need to run:
sudo mkdir /sys/fs/cgroup/systemd && sudo mount -t cgroup -o none,name=systemd cgroup /sys/fs/cgroup/systemd.
Also see co/docker-driver open issues.
Troubleshooting
Verify Docker container type is Linux
- On Windows, make sure Docker Desktop’s container type setting is Linux and not windows. see docker docs on switching container type.
You can verify your Docker container type by running:
docker info --format '{{.OSType}}'
Run with logs
- Run
--alsologtostderr -v=1for extra debugging information
Deploying MySql on a linux with AppArmor
-
On Linux, if you want to run MySQL pod, you need to disable AppArmor for mysql profile
If your docker has AppArmor enabled, running mysql in privileged mode with docker driver will have the issue #7401. There is a workaround - see moby/moby#7512.
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