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5524fc39e5
Improved wording in docker installation Note based on review feedback. Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
80 lines
2.5 KiB
Markdown
80 lines
2.5 KiB
Markdown
# Install Docker for Kata Containers on Ubuntu
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> **Note:**
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>
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> - This guide assumes you have
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> [already installed the Kata Containers packages](../ubuntu-installation-guide.md).
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1. Install Docker with the following commands:
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> **Notes:**
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>
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> - This step is only required if Docker is not installed on the system.
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> - Newer versions of Docker have
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> [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373)
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> so the following commands install the latest version, which includes
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> devicemapper support.
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> - To remove the lock on the docker package to allow it to be updated:
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> ```sh
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> $ sudo apt-mark unhold docker-ce
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> ```
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```bash
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$ sudo -E apt-get -y install apt-transport-https ca-certificates software-properties-common
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$ curl -sL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
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$ arch=$(dpkg --print-architecture)
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$ sudo -E add-apt-repository "deb [arch=${arch}] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
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$ sudo -E apt-get update
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$ sudo -E apt-get -y install --allow-downgrades docker-ce='18.06.2~ce~3-0~ubuntu'
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$ sudo apt-mark hold docker-ce
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```
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For more information on installing Docker please refer to the
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[Docker Guide](https://docs.docker.com/engine/installation/linux/ubuntu).
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2. Configure Docker to use Kata Containers by default with one of the following methods:
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1. systemd
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```bash
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$ sudo mkdir -p /etc/systemd/system/docker.service.d/
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$ cat <<EOF | sudo tee /etc/systemd/system/docker.service.d/kata-containers.conf
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[Service]
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ExecStart=
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ExecStart=/usr/bin/dockerd -D --add-runtime kata-runtime=/usr/bin/kata-runtime --default-runtime=kata-runtime
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EOF
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```
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2. Docker `daemon.json`
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Add the following definitions to `/etc/docker/daemon.json`:
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```json
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{
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"default-runtime": "kata-runtime",
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"runtimes": {
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"kata-runtime": {
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"path": "/usr/bin/kata-runtime"
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}
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}
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}
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```
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3. Restart the Docker systemd service with the following commands:
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```bash
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$ sudo systemctl daemon-reload
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$ sudo systemctl restart docker
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```
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4. Run Kata Containers
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You are now ready to run Kata Containers:
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```bash
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$ sudo docker run busybox uname -a
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```
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The previous command shows details of the kernel version running inside the
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container, which is different to the host kernel version.
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