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docs: Update docker installation guides for /etc/docker
Added explanation that the `/etc/docker/` directory needs to be created. Fixes: #569. Signed-off-by: shinebayar-g <[email protected]>
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‎install/aws-installation-guide.md

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# Install Kata Containers on Amazon Web Services
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# Install Kata Containers on Amazon Web Services
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* [Install and Configure AWS CLI](#install-and-configure-aws-cli)
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* [Create or Import an EC2 SSH key pair](#create-or-import-an-ec2-ssh-key-pair)

‎install/docker/centos-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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‎install/docker/debian-docker-install.md

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> If you wish to use a block based backend, see the options listed on https://github.com/kata-containers/documentation/issues/407.
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```bash
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$ sudo apt-get -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common
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$ sudo apt-get -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common
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$ curl -fsSL https://download.docker.com/linux/$(. /etc/os-release; echo "$ID")/gpg | sudo apt-key add -
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$ sudo add-apt-repository "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
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$ sudo apt-get update
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2. Configure Docker to use Kata Containers by default with **ONE** of the following methods:
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a. `sysVinit`
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- with `sysVinit`, docker config is stored in `/etc/default/docker`, edit the options similar to the following:
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```sh
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$ sudo sh -c "echo '# specify docker runtime for kata-containers
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DOCKER_OPTS=\"-D --add-runtime kata-runtime=/usr/bin/kata-runtime --default-runtime=kata-runtime\"' >> /etc/default/docker"
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```
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b. systemd (this is the default and is applied automatically if you select the
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[automatic installation](https://github.com/kata-containers/documentation/tree/master/install#automatic-installation) option)
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c. Docker `daemon.json`
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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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Add the following definitions to `/etc/docker/daemon.json`:
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```json
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3. Restart the Docker systemd service with one of the following (depending on init choice):
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a. `sysVinit`
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```sh
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$ sudo /etc/init.d/docker stop
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$ sudo /etc/init.d/docker start
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```sh
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$ tail -f /var/log/docker.log
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```
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b. systemd
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```bash

‎install/docker/fedora-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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‎install/docker/opensuse-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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‎install/docker/rhel-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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‎install/docker/sles-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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‎install/docker/ubuntu-docker-install.md

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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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Create docker configuration folder.
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```
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$ sudo mkdir -p /etc/docker
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```
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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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