[jdoss]

> Docker has much wider adoption than OpenVZ does now.

I don't think your statement is true at this point in time. OpenVZ is used by a ton of companies in the hosting industry and by large companies such as Groupon and smaller ones like TravisCI [1]. I would't make a statement that that Docker has a wider adoption than OpenVZ at this point in time. Maybe in five years, yes it may have a wider adoption than OpenVZ. OpenVZ and commercial VZ have been doing full OS containers since the early 2000s and it has the production track record to do very well in many server applications. I wouldn't hesitate to use it over Docker in production for my future projects.

[1]: http://changelog.travis-ci.com/post/45177235333/builds-now-r...

[justincormack]

Travis moved to Docker after that [1]. And the "hosting industry" is not the thing it used to be since cloud.

[1] http://blog.travis-ci.com/2014-12-17-faster-builds-with-cont...

[jdoss]

Very cool on the Docker move by Travis. I still think Docker has a long way to go to over take OpenVZ. Docker is gaining steam, but it's adoption rate isn't wider than OpenVZ. Not yet.

I agree that the hosting industry isn't what it used to be. Most of the larger hosting providers are not keeping up with the current trends and deployment methods, but that is mostly due to the fact that they do not need change. Most people who are buying commodity hosting don't have a team of developers and operations guys to use all the new cool cloud methods like Docker.

[SEJeff]

And Docker is massively used at Groupon, so your argument isn't valid.

https://engineering.groupon.com/2014/misc/dotci-and-docker/ http://www.meetup.com/Docker-Chicago/events/220936626/

Source: I work at 600 W Chicago, the Groupon World HQ, where they frequently host Docker meetups on the 6th floor.

[jdoss]

I never said Docker wasn't used at Groupon and just because it is used in some cases, doesn't make my point any less valid. It is going to take a lot more than a few years to take over OpenVZ/Virtuozzo in market share when most of the commodity hosting industry uses it.

[SEJeff]

FWIW: The two companies that contributed the most to the namespace code in the upstream Linux kernel (that Docker uses) were Parallels and Google, both of which know a lot about containers at Scale. For those that don't know, Parallels wrote virtuozzo.

(from linux.git):

$ git log --pretty=oneline --no-merges --author='@parallels.com' | wc -l 695

I also suspect that it won't take super long for container technologies like Docker to take over OpenVZ/Virtuozzo if not only for projects like Kubernetes, which is backed by Google, and is the basis for commercial PaaS offerings such as Openshift v3 from Redhat. Virtuozzo is great tech, but using it for a new buildout seems like a bad idea for the forseeable future. Docker is not as good, but will be soon, and is supported out of the box on every modern distribution.