Hi All, Overlayfs was merged 3.18 and overlayfs in 4.0.4 adds support for multiple lower layers.
Current LXC snapshot can so single layers, is there any plan to support mulitple lower layers? The main advantage I see is you can do snapshot of base OS and then add an app and snapshot that, and these 2 can be your seed container. You then mount the rootfs of base OS and delta0 of snapshot1 with 2 overlays lower layers as the rootfs of your deploy container. I have put together a small script that does exactly that including a pre-mount hook for the 2 lower overlayfs layers and it seems to work well enough. The limitation of one lower layer is if you want to deploy 5 apps across lets say 50 containers, then having a single level snapshot will force you to have 5 base level OS containers for each of the apps. With 2 lower layers you can have a single base OS container and 5 overlay snapshots for each of the apps. Thanks Tobby www.flockport.com
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