How to use tmpfs for temporary directory (/tmp).
Resize live tmpfs filesystem.
Use column utility to align simple MariaDB output like variable list.
Inspect and improve docker image using dive utility for exploring each layer in a docker image.
Install and configure a Kafka cluster without ZooKeeper to play with it.
Generate Kafka cluster ID for Kafka Raft metadata mode.
Relay all mail to an external account which can come in handy in your lab environment.
Debian Bullseye currently provides Samba 4.13.5. Using BIND as Samba Active Directory DNS backend opens it to the DNS zone transfer.