unik VS app-helloworld-cpp

And on that note, I just found this list of UniKernel projects:

http://unikernel.org/projects/

I have especially had hopes for the UniK [1] project, as it was/is written in Go AFAIK. I see now it incorporates work from the Mirage project as well. Not sure what is the status of this project anymore though.

[1] https://github.com/solo-io/unik

Wow, just now seeing this topic. I work for a cloud company hosted in AWS. We started out, Netflix/Spotify style microservices. We were all on ec2 images generate by packer (and later with AWS Image Factory). When Docker hit, we kicked the tires but never did anything with it beyond using it for running unit tests, and later, infrastructure tests. 5 years ago, during a hackathon, our little group began experimenting with Unikernels, or library operating systems. Interestingly enough, these Unikernels were all stripped down BSD kernels. OSv is FreeBSD based, and Rumprun is NetBSD based. Services running in EC2 on Unikernels would spin up and start sending and receiving traffic before the AWS EC2 healthchecks completed. They are blazing fast! Only problem in 2017, was the tooling. It would have taken too much effort to use Unikernals with our infrastructure. As soon as they start making Unikernels that can run Java bytecode like native code, the fate of containerization will be sealed, IMO. We could get basic JVM webservers running on OSv, but not Cassandra, not Kafka, not yet. OSv now runs on Firecracker, but I have not tried it out, yet. Some links if you are interested: OSv: https://osv.io Rumprun: https://github.com/rumpkernel/rumprun We used this tooling during the Hackathon, but doesn't look like it has been touched in 3 years: https://github.com/solo-io/unik Unikraft Unikernel Dev kit: https://unikraft.org/ And don't forget Firecracker running in Kubernetes https://www.weave.works/oss/firekube/ And of course, being a FreeBSD subreddit, let's not forget FreeBSD on Firecracker https://www.daemonology.net/blog/2022-10-18-FreeBSD-Firecracker.html

Crazy idea that I'm sure isn't an original thought: instead of adapting the languages to deal with abstracting the idiosyncrasies of each OS, change the OSes to expose a universal API to make everything else lighter.

I guess that's also kinda Docker or QEMU or V8, but also https://github.com/solo-io/unik if you think about it differently.

In other words: hey, Lisp Machines were an excellent idea back then, but they still are. Maybe someday we'll have a V8 co-processor. More fun reading: https://lobste.rs/s/2poahh/what_i_could_not_undiscover_about

The HN conversations around unikernels suggest that they're not ready for production yet [0] but feel free to set that record straight.

In the meantime, a handful of organisations/individuals seem to be working on becoming "Docker for unikernels". That's probably an unfair description, but they're aiming to produce tools for building and managing unikernels: Unikraft [1], NanoVMs/Nanos [2], Unik [3]. Other orgs are producing unikernel-based OSs and VMs [4].

What is your toolset for building and managing unikernels? What have you learned?

Bonus question: is Unik dead? [5]

[0] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&query=unikernel&sort=byPopularity&type=story

[1] https://unikraft.org/

[2] https://github.com/nanovms/nanos

[3] https://github.com/solo-io/unik/

[4] http://unikernel.org/projects/

[5] https://github.com/solo-io/unik/issues/172

UniK will compile and deploy its own 30 MB unikernel. This unikernel is the Unik Instance Listener. The Instance Listener uses udp broadcast to detect (the IP address) and bootstrap instances running on Virtualbox.

They differ very widely. It's instructive to look at unikraft which is probably the easiest to develop on (IMHO). eg: https://github.com/unikraft/app-helloworld-cpp

Our unikernel (UKL) lets you link your Linux program with the Linux kernel and produces a binary which run in a VM or on baremetal (essentially a custom vmlinuz). It's a bit laborious at the moment, one of many things to fix before release.