The Kubernetes Book, by Nigel Poulton. A very detailed and well explained book that is updated every year and you get them all for a one-time purchase.
Build Your Own Lisp, by Daniel Holden. This is an often cited classic with a lot of precious concepts explained in detail. It can be read for free online. But this is an opportunity to reward them for it. (Yes, I do own a purchased copy).
Ansible for DevOps by Jeff Geerling. Already mentioned by the sibling commenter.
There a lot more on my wishlist. All of them are competitively priced at 10 to 15$ each.
The Kubernetes Book, by Nigel Poulton. A very detailed and well explained book that is updated every year and you get them all for a one-time purchase.
Build Your Own Lisp, by Daniel Holden. This is an often cited classic with a lot of precious concepts explained in detail. It can be read for free online. But this is an opportunity to reward them for it. (Yes, I do own a purchased copy).
Ansible for DevOps by Jeff Geerling. Already mentioned by the sibling commenter.
There a lot more on my wishlist. All of them are competitively priced at 10 to 15$ each.
Jeff Geerling's classic, "Ansible for DevOps", since naturally you'll be configuring PF on lots of servers.
[1] https://leanpub.com/ansible-for-devops