What should a sysadmin portfolio look like?

Question

System administration

Hello!
For example, on odesk there is an item like "Portfolio". OKAU, if this is a web designer or programmer, he can throw links to his projects on github, for example, or made sites / portals.
What can an admin post? It comes to my mind only the 1st, for example, what kind of thread are fucking scripts for automating the operation of the system, or something like that, but what do you place in your portfolio (if you are a system administrator, of course)?
And yes, the completed courses on coursera are considered a plus to the resume in our time?
UPD
https://openhatch.org/ or https://freedomsponsors.org count? Is it like fixing bugs and helping to develop free software (not financially!)?

Answer 1

The system administrator can describe the previous offices that he supported. Approximate size (number of workstations, servers, routers), services and platforms that he raised and supported. Certificates, if any, a brief list of technologies with which he is familiar and the level of familiarity.