[GENERAL] PG and database encryption

We have a requirement to encrypt the entire database.  What is the best tool
to accomplish this. Our primary goal is that it should be transparent to the
application, with no change in the application, as compared to un-encrypted
database. Reading about pgcrypto module, it seems it is good for few columns
only and using it to encrypt entire database is not a good use-case.

Is this which can be done best by file level encryption?  What are the good
tools on Linux (RHES), preferably open-source.

Thanks



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