People comparing Docker and Jails don't really understand that Docker is 99% about packaging and composing software. From that perspective Jails are nothing like Docker containers. No versioning, no standard, no registry, no compose, no healthchcks, no tree of containers, etc. etc. etc.
If you want to compare Jails to something on Linux then I think LXD is probably much closer to what Jails are.
RAM Doubler was a third-party application in the days when a top-of-the-line Mac had 128MB of RAM, with a 40Mhz processor. The level 2 cache was 256 bytes.
That's not in the same universe as hardware compression on a 6-core, 64-bit ARM processor with cores that can run at 4GHz.
Weird .. I easily run 40 docker containers on an 8GB MacBook just fine!
(Just posting this to show that you have to be very specific when talking about these kind of things. Yeah maybe you need 32GB because you run some large deployment 3 times. Others mayb be totally fine with less if they just develop a basic Python web app. Who knows. The devil is in the details. Omitting them makes the discussion ambiguous and just difficult.)
Do not underestimate the power of a single server to host you app. Sure it won't work in _all_ situations but omg you can get so much out of a single $30/month VPS .. we've been indoctrinated that everything needs to be on hyperclouds and mega scale. But that brings so much cost and complexity that most applciations don't need.
> you can get so much out of a single $30/month VPS
I agree with this 100%, but only wanted to note, that not all VPSes are equal. Having worked in shared hosting business in the past, I can tell from experience that performance can vary greatly depending on hosting provider and how much they have over provisioned their virtualization platform, since VPS is nothing more than a VM running on someones else's hardware and that someone can put 4 VMs on single CPU core - all fighting for same CPU time, so it's depends on certain luck what will your VM get and what neighbors are doing - idling of being hacked and mining crypto. So if requirements are serious, look out for dedicated core VPS hosting and stay away from too good to be true cheap VMs deals. Also relevant monitoring metric is CPU steal time - its percentage of time a virtual CPU waits for a physical CPU from the hypervisor while it is busy serving another VM - that is strong indication you are being ripped off CPU.
100%. And super easy to scale up to a certain point. Alternatives have it's place though (PaaS is excellent for 100% product focus in limited timeframe, cloud/orchestration when you have scale, Kamal in Rails world is a neat middleground for some extra robustness).
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