How to become good sysadmin? Understand how your system works and do
everything to not interfere with it. This simple principle is the most
important for a sysadmin, all the rest is an implication of it.
How to use logging (shipping, processing), how to install software (packaging
systems), how to one can separate services in different ways, how to
communicate with systems, how to work with resources, how to tell what's going
on in OS (what's running, what uses what, what subsystems are under how much
load) are all derivatives of "know your system and work with it instead of
around/against it".
How to use logging (shipping, processing), how to install software (packaging systems), how to one can separate services in different ways, how to communicate with systems, how to work with resources, how to tell what's going on in OS (what's running, what uses what, what subsystems are under how much load) are all derivatives of "know your system and work with it instead of around/against it".