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52690de805
Improved the Docker installation instructions by making it clear *which* of the multiple ways of configuration Docker for Kata is the default, and that it is not necessary to do anything further if users select the automatic installation method. Fixes: #551. Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
70 lines
2.2 KiB
Markdown
70 lines
2.2 KiB
Markdown
# Install Docker for Kata Containers on CentOS
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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](../centos-installation-guide.md).
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1. Install the latest version of 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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> - Docker version 18.09 [removed devicemapper support](https://github.com/kata-containers/documentation/issues/373).
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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 yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
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$ sudo yum -y install 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/centos).
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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 (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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```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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