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OpenVZ is closer to KVM (full virtualization). OpenVZ container is a lightweight VM which shares host kernel, has persistent FS and traditional OS you have to manage.

When I worked with docker containers, I noticed that they seem to present a full OS, with a FS that you had to manage.

I had to change /etc config files, mange where logfiles went and how they were handled, all of this is described on a diffing filesystem.

I might be misinterpreting what you mean though. I have no experience with OpenVZ and little with Docker.

This was mentioned many times, but still: this is about "best practices" or common use case. OpenVZ or Docker (or even full VMs) can interchangeably be used to solve a given use case

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