What are containers? How do you run them without using Docker?

1. Containers without Docker
@Ben_Hall
Ben@BenHall.me.uk
Katacoda.com

3. WHOAMI?

4. Learn via Interactive Browser-Based Labs
Katacoda.com

6. Agenda
• Why?
• What is a Container?
• Launching a Container without Docker
• Building Containers without Docker
• Deploying Kubernetes using CRI-O

7. Docker - An open platform for distributed
applications for developers and sysadmins.

8. Got us to agree on something!

9. Docker isn’t the only
container runtime!

10. Docker is no longer about
building/launching Containers.
Runc and Containerd donated to
Linux Foundation and CNCF
“Docker” renamed to Moby

11. Docker on a CI/CD Server
• Need Privileged Permissions
• Install Docker
• Run daemon on host
• Provide access to Docker Server to CI Runner

13. Linux Kernel?

15. What is a container?
https://www.katacoda.com/courses/co
ntainers-without-docker/what-is-a-
container

16. https://github.com/lizrice/containers-from-scratch

20. Launching Containers with Runc
https://www.katacoda.com/courses/co
ntainers-without-docker/running-
containers-with-runc

21. Launching Containers with Podman
https://www.katacoda.com/courses/co
ntainers-without-docker/running-
containers-with-podman

22. What is an image?
https://www.katacoda.com/courses/co
ntainers-without-docker/what-is-a-
image

24. Building Images with Buildah and
Img
https://www.katacoda.com/courses/containers-without-
docker/building-container-images-with-buildah
https://www.katacoda.com/courses/containers-without-
docker/building-container-images-with-img

25. What about Container Networks?

27. https://github.com/containernetworking/cni/blob/a700ea864b5f1852d179ce83e8bc169f0b4a0ef4/scripts/docker-run.sh

28. Launching Containers with
Kubernetes without Docker?

31. Getting Started With CRI-O and
Kubeadm
https://www.katacoda.com/courses/co
ntainers-without-docker/getting-
started-with-kubeadm-crio

32. What about Windows Containers?

35. var cs = new ContainerSettings
{
SandboxPath = path,
Layers = layers,
KillOnClose = true,
NetworkId = HostComputeService.FindNatNetwork(),
};
using (var container = HostComputeService.CreateContainer(id.ToString(), cs))
{
Console.Out.WriteLine("starting container");
Console.Out.Flush();
container.Start();
var si = new ProcessStartInfo { CommandLine = command };
using (var process = container.CreateProcess(si))
{
Console.Out.Write(process.StandardOutput.ReadToEnd());
process.WaitForExit(5000);
Console.Out.WriteLine("process exited with {0}", process.ExitCode);
}
container.Shutdown(Timeout.Infinite);
}

36. [DllImport("vmcompute.dll", PreserveSig = false, ExactSpelling = true)]
IntPtr computeSystem;
h.CreateComputeSystem(id, JsonHelper.ToJson(hcsSettings), IntPtr.Zero, out computeSystem);
return Container.Initialize(id, computeSystem, settings.KillOnClose, h);

38. Done!
• Important to consider alternatives, leads to
different approaches and innovation
• Podman, Buildah, Img provide valuable
choices
• Kubernetes and CRI-O will be the future…

39. http://www.katacoda.com/

40. Thank you!
Questions? Feedback?
@Ben_Hall
www.Katacoda.com
Ben@BenHall.me.uk
Blog.BenHall.me.uk