Please install the Perl module Redis on Tool Labs. Also known as "libredis-perl".
libredis-perl is already installed:
valhallasw@tools-bastion-01:~$ aptitude show libredis-perl
Automatically installed: no
Maintainer: Ubuntu Developers <firstname.lastname@example.org>
Uncompressed Size: 121 k
Depends: perl, libio-socket-timeout-perl, libtry-tiny-perl
Description: persistent key-value database with network interface (Perl client library)
Redis is a key-value database in a similar vein to memcache but the dataset is non-volatile. Redis additionally provides native support for atomically manipulating and querying data structures such as lists and sets.
This package contains the Perl client library.