2019-11-19 15:31:35 +00:00
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journaling makes the image only unwritable, rather than both unreadable
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and unwritable:
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$ rbd create --size 1 --image-feature layering,exclusive-lock,journaling img
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2020-08-11 15:45:18 +00:00
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$ rbd snap create --no-progress img@snap
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2019-11-19 15:31:35 +00:00
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$ rbd snap protect img@snap
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$ rbd clone --image-feature layering,exclusive-lock,journaling img@snap cloneimg
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$ DEV=$(sudo rbd map img)
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rbd: sysfs write failed
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rbd: map failed: (6) No such device or address
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[6]
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$ DEV=$(sudo rbd map --read-only img)
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$ blockdev --getro $DEV
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1
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$ sudo rbd unmap $DEV
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$ DEV=$(sudo rbd map cloneimg)
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rbd: sysfs write failed
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rbd: map failed: (6) No such device or address
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[6]
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$ DEV=$(sudo rbd map --read-only cloneimg)
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$ blockdev --getro $DEV
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1
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress cloneimg
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$ rbd snap unprotect img@snap
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$ rbd snap rm --no-progress img@snap
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$ rbd rm --no-progress img
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