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A comment on Permissive forwarding rule leads to unintentional exposure of containers (2021). Parent comment

Re:Permissive forwarding rule leads to unintentional exposur... by jskrablin on Wednesday June 22, 2022 @04:43PM (#31841640)
OpenVZ is around since 2005, see https://en.m.wikipedia.org/wiki/OpenVZ and it had checkpointing, live migration between hosts, dump container to tar, etc before Docker even existed.
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Re:Permissive forwarding rule leads to unintentional exposur... by sillystuff on Wednesday June 22, 2022 @05:17PM (#31841968)
And linux vserver* has been around since 2001.

If you were willing to use out of tree patches, linux containers pre-date Solaris containers by years (Debian distributed pre-patched kernels pretty early on, so you didn't need to deal with compiling your own kernels, and Debian also had an option for vserver + grsec patched kernels). But, freebsd jails beats linux vserver by a year.

* not to be confused with the similarly named linux virtual server (LVS) load balancer.

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