> and it was FreeBSD who I believe had the first container system (jail).
This is an interesting tidbit that I had not considered before!
It would appear you are correct, but I would mention that the appearance of "jail" in FreeBSD 4.0 is very close to the appearance of OpenVZ (at least from the cursory look up I did).
While 4.0-REL was released in March 2000, and the OpenVZ history section starts with the concept phase in November 1999, the commit that upstreamed jails into FreeBSD was made in April 1999 with comment `Run for almost a year by: ...`
Bryan Cantrill has a nice talk which starts with a bit of history on containers (chroot, FreeBSD jails, Solaris zones, etc.). https://youtu.be/hgN8pCMLI2U
This is an interesting tidbit that I had not considered before!
It would appear you are correct, but I would mention that the appearance of "jail" in FreeBSD 4.0 is very close to the appearance of OpenVZ (at least from the cursory look up I did).