I've been asked to encrypt the filesystem of a live server without affecting the operations or data. I normally install Redhat with encrypted filesystem, so the "how" is not the problem. I want to know if it is even possible to encrypt the filesystem without shrinking the partition, making a new partition, encrypting it, copying everything over, deleting the old partition, and resizing the new partition to fill the drives.
Not possible using native tools. It may be possible to encrypt in-place using third-party tools, but I have no experience doing so on RHEL.
You may be quicker by re-creating a new partition that fit target device and use another encryption for transfer:
Care about opened files, you've better to do this in single-user-mode (
Than after moving gpg crypted tarball to destination host, re-creating crypted partition and mounting them on
Doing so let you the ability of whipe file creation and use low-level network directly as: