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docs/userns: Clarify containerd 1.7 limitations

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Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
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Rodrigo Campos 2023-09-19 15:06:19 +02:00
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docs/user-namespaces/README.md
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@ -74,9 +74,9 @@ Different containerd versions have different limitations too, those are highligh
### containerd 1.7
One limitation present in containerd 1.7 is that it needs to change the ownership of every file and
directory inside the container image, during Pod startup. This means it has a storage overhead (the
size of the container image is duplicated each time a pod is created) and can significantly impact
the container startup latency.
directory inside the container image, during Pod startup. This means it has a storage overhead, as
**the size of the container image is duplicated each time a pod is created**, and can significantly
impact the container startup latency, as doing such a copy takes time too.
You can mitigate this limitation by switching `/sys/module/overlay/parameters/metacopy` to `Y`. This
will significantly reduce the storage and performance overhead, as only the inode for each file of