docs: add nydusify copy usage

Signed-off-by: Yan Song <[email protected]>
dragonflyoss · Aug 24, 2023 · f78e864 · f78e864
1 parent 89c5de8
commit f78e864
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diff --git a/docs/nydusify.md b/docs/nydusify.md
@@ -191,6 +191,15 @@ nydusify mount \
   --backend-config-file /path/to/backend-config.json
 ```
 
+## Copy image between registry repositories
+
+``` shell
+nydusify copy \
+  --source myregistry/repo:tag-nydus \
+  --target myregistry/repo:tag-nydus-copy
+```
+
+It supports copying OCI v1 or Nydus images, use the options `--all-platforms` / `--platform` to copy the images of specific platforms.
 
 ## More Nydusify Options