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CoreOS Essentials by Rimantas Mocevicius

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How CoreOS works

CoreOS has no package manager, so everything needs to be installed and used via docker containers. Moreover, it is 40 percent more efficient in RAM usage than an average Linux installation, as shown in this diagram:

How CoreOS works

CoreOS utilizes an active/passive dual-partition scheme to update itself as a single unit, instead of using a package-by-package method. Its root partition is read-only and changes only when an update is applied. If the update is unsuccessful during reboot time, then it rolls back to the previous boot partition. The following image shows OS updated gets applied to partition B (passive) and after reboot it becomes the ...

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