harbor/docs/1.10/administration/registry_read_only.md

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Make the Registry Read Only

You can set Harbor to read-only mode. In read-only mode, Harbor allows docker pull but prevents docker push and the deletion of repositories and tags.

If it set to true, deleting repositories, tags and pushing images are not permitted.

$ docker push 10.117.169.182/demo/ubuntu:14.04  
The push refers to a repository [10.117.169.182/demo/ubuntu]
0271b8eebde3: Preparing 
denied: The system is in read only mode. Any modification is prohibited.  

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