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5. Known Limitations
--------------------
-container-tools currently do not work with systemd-networkd and depend on ifupdown.
+ * This version of container-tools currently do not work with systemd-networkd and depend on ifupdown.
+ * Using overlay, the upper directory can not be an NFS mount due to limitations in Linux' overlay filesystem,
+ see https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/filesystems/overlayfs.txt
6. Usage