Merge pull request #2611 from CSCfi/fullUrlImages

Add a warning about Full Qualified Image Name

Author: vartikashah

docs/cloud/rahti/images/overview.md

@@ -198,3 +198,7 @@ $ docker inspect nginx
     }
 ]
 ```
+
+## Troubleshooting
+
+Check out our [Rahti FAQ](../../../support/faq/index.md#rahti) and [Rahti tutorials](../tutorials/index.md) for more information

docs/support/faq/get-image-format.md

@@ -1,5 +1,13 @@
 # Why Rahti cannot find this docker image?
 
+!!! error "Pulling images from DockerHub"
+    Since the last Rahti version deployed (OpenShift 4.17) there is a configuration change when pulling images. Some images are hardcoded. It will pull from a specific repository (like JFrog).
+    To minimise the impact and avoid errors when pulling the image from DockerHub, you must use the fully qualified image name.
+
+    For example, instead of using `image: mongo:latest`, you should use `image: docker.io/library/mongo:latest`.
+
+    This behavior will be fixed in OpenShift 4.18. We don't have ETA for now.
+
 ![Could not load image](img/Could_not_load_image_metadata.png)
 
 Often there are simple causes for this problem. Maybe there is a typo in the image name, or the image might have been removed since the last time it was successfully pulled. These two problems are common, and as such, it is worth double-checking the image source.

docs/support/faq/index.md

@@ -90,6 +90,7 @@
 * [How to transfer data to Rahti?](transfer_data_rahti.md)
 * [Protecting against DDoS Attacks](DDos.md)
 * [Why my SSH key does not work in Rahti?](ssh-clone.md)
+* [Why Rahti cannot find this docker image?](get-image-format.md)
 * [Why this container report permission denied errors?](why-this-container-does-not-work.md)
 
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