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I am trying to boot CoreOS from a PXE server using ramdisk. However, no matter what size of ramdisk I specify (with ramdisk_size) CoreoOS always takes half of the memory as a ramdisk. Can anyone tell me how to specify the ramdisk size at boot?

babbata
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  • I'm flagging this as off-topic because this question is not directly about programming. Please transfer this question to http://serverfault.com/ – Jeroen Peeters Nov 03 '15 at 10:39

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This has to do with the default nature of temporary filesystems in that they will default to 50% as the limit but won't reserve that much memory; actual usage will grow over time, but will not exceed the 50% limit.

Also you'll find this in the official CoreOS docs regarding PXE:

The filesystem will consume more RAM as it grows, up to a max of 50%. The limit isn't currently configurable.

kelseyhightower
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