A rolling strategy is the best to implement when needing to replace a cloud solution without interruptions and keeping costs low. This approach updates or replaces parts of the system gradually with minimal downtime and allows for a phased implementation.

A syslog server is a centralized repository for logs from different devices and applications. It can be used to collect, store, and analyze logs from all the systems in the private cloud.

AES (Advanced Encryption Standard) is the best algorithm to replace Base64 for secure data exchange. Base64 is an encoding method that is not secure by itself, as it's easily reversible.
AES, on the other hand, is a widely used encryption standard that ensures data is protected and is not readable without the correct encryption key.

The main difference between public and private container repositories lies in access control.
Public repositories allow users to download and use container images without requiring any authorization, making them accessible to anyone. On the other hand, private repositories require users to have proper authorization, usually through credentials, to access the container images, thus providing a level of privacy and security control.

Application whitelisting is the practice of specifying an index of approved software applications or executable files that are permitted to be present and active on a computer system.
The goal of whitelisting is to protect computers and networks from potentially harmful applications.