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docs: Add CentOS installation guide

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This will add the installation guide for CentOS.

Fixes #84

Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>
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Gabriela Cervantes 2018-05-21 02:18:09 -05:00
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Select your preferred distribution:
* [CentOS](https://github.com/kata-containers/documentation/blob/master/install/centos-installation-guide.md)
* [Fedora](https://github.com/kata-containers/documentation/blob/master/install/fedora-installation-guide.md)
* [Ubuntu](https://github.com/kata-containers/documentation/blob/master/install/ubuntu-installation-guide.md)

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# Installing Kata Containers on CentOS
Note: Kata Containers is available for CentOS version 7.
This step is only required in case Docker is not installed on the system.
1. Install the latest version of Docker with the following commands:
```bash
$ sudo yum -y install dnf-plugins-core
$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
$ sudo yum -y install docker-ce
```
For more information on installing Docker please refer to the
[Docker Guide](https://docs.docker.com/engine/installation/linux/centos)
2. Install the Kata Containers components with the following commands:
**Note:** The repository redirects the download content to use `http`, be aware that this installation channel is not secure.
```bash
$ source /etc/os-release
$ sudo -E VERSION_ID=$VERSION_ID yum-config-manager --add-repo \
http://download.opensuse.org/repositories/home:/katacontainers:/release/CentOS_\$VERSION_ID/home:katacontainers:release.repo
$ sudo -E yum -y install kata-runtime kata-proxy kata-shim
```
3. Configure Docker to use Kata Containers by default with the following commands:
```bash
$ sudo mkdir -p /etc/systemd/system/docker.service.d/
$ cat <<EOF | sudo tee /etc/systemd/system/docker.service.d/kata-containers.conf
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -D --add-runtime kata-runtime=/usr/bin/kata-runtime --default-runtime=kata-runtime
EOF
```
4. Restart the Docker systemd service with the following commands:
```bash
$ sudo systemctl daemon-reload
$ sudo systemctl restart docker
```
5. Run Kata Containers
You are now ready to run Kata Containers:
```
$ sudo docker run -ti busybox sh
```