fedora-docker-install.md

Install Docker for Kata Containers on Fedora

Note:

• This guide assumes you have already installed the Kata Containers packages.

1. Install the latest version of Docker with the following commands:

   Notes:

   • This step is only required if Docker is not installed on the system.
   • Docker version 18.09 removed devicemapper support. If you wish to use a block based backend, see the options listed on #407.

   $ source /etc/os-release
   $ sudo dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
   $ sudo dnf makecache
   $ sudo dnf -y install docker-ce

   For more information on installing Docker please refer to the Docker Guide.

2. Configure Docker to use Kata Containers by default with ONE of the following methods:

   1. systemd (this is the default and is applied automatically if you select the automatic installation option)

      $ 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

   2. Docker daemon.json

      Create docker configuration folder.

      $ sudo mkdir -p /etc/docker
      

      Add the following definitions to /etc/docker/daemon.json:

      {
        "default-runtime": "kata-runtime",
        "runtimes": {
          "kata-runtime": {
            "path": "/usr/bin/kata-runtime"
          }
        }
      }

3. Restart the Docker systemd service with the following commands:

   $ sudo systemctl daemon-reload
   $ sudo systemctl restart docker

4. Run Kata Containers

   You are now ready to run Kata Containers:

   $ sudo docker run busybox uname -a

   The previous command shows details of the kernel version running inside the container, which is different to the host kernel version.