Slide 19
Slide 19 text
19
Btrfs as filesystem – Layout (1/2)
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Base OS and snapshots are read-only
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Subvolumes to store data are read-write
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Example: /var/log, /var/cache, /var/crash and similar directories
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Use overlayfs for /etc (for cloud-init and salt)
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Introduce /var/lib/overlay/{work,etc} for overlayfs
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Full stateless system:
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Remove content of /var/lib/overlay/etc/ and /var/lib/cloud
=> Not recommended, since even /etc/machine-id can go lost!