It runs as root on Windows and Mac too but in a VM seperated from the
host OS. So ironically it's secure on every OS except the one that enables
it's technology to work. The Linux kernal.
And can't you run it in a VM in Linux, just like in Windows or Mac?
You can and that's what Docker Machine did without all the fuss (bugs aside). But manually exposing docker outside of the VM to your host is difficult and complex.
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Docker can be run in rootless mode as well. Albeit it is still experimental and has some limitations, I expect it will get better soon enough.
Interesting googles excitedly 😃
And can't you run it in a VM in Linux, just like in Windows or Mac?
You can and that's what Docker Machine did without all the fuss (bugs aside). But manually exposing docker outside of the VM to your host is difficult and complex.