https://en.wikipedia.org/wiki/Solaris_Containers 2004 I will just leave it here.
Solaris containers didn't have anything like Docker Hub nor was setting them up as easy as "docker run".
(Posting as ex-Solaris guy)
My introduction to containers was in HP-UX in 1999, via the HP Vault infrastructure.
Tru64, while short lived in the market, also had similar ideas.
And then there is the whole linage of mainframe and micro computers from IBM.