Create df - Inodes.md

runbooks/df - Inodes.md

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+This runbook is about analyzing out of inodes disk usage issues.
+
+## Preparation
+
+Determine mount point that is full from
+
+    df -i
+
+Watch out for the `IUse%` column being above 90%.
+
+## Find directories with the most files
+
+Solutions from [shellhacks.com](https://www.shellhacks.com/how-to-check-inode-usage-in-linux/):
+
+    { find / -xdev -printf '%h\n' | sort | uniq -c | sort -rn; } 2>/dev/null | head