fix urls

Author: Xronophobe

chapter_11_ansible.asciidoc

@@ -142,7 +142,7 @@ something else, but I won't be able to help you as much if you get stuck.
 ((("Linux servers")))
 If you've never started a Linux server before and you have absolutely no idea
 where to start, I wrote a
-https://github.com/hjwp/Book-TDD-Web-Dev-Python/blob/master/server-quickstart.md[very brief guide on GitHub].
+https://github.com/hjwp/Book-TDD-Web-Dev-Python/blob/main/server-quickstart.md[very brief guide on GitHub].
 
 
 NOTE: Some people get to this chapter, and are tempted to skip the domain bit,
@@ -176,6 +176,20 @@ without learning a good bit more about it.
 is that it means a slightly fewer security issues to worry about.)
 If you'd like a place to start, here's as good a place as any:
 https://plusbryan.com/my-first-5-minutes-on-a-server-or-essential-security-for-linux-servers[My first 5 minutes on a server].
+// CSANAD: this webpage now redirects to a law firm's website.
+//         there is a repost of the same article:
+// https://www.jamesonricks.com/re-post-my-first-5-minutes-on-a-server-or-essential-security-for-linux-servers/
+//
+//          The wayback machine has the original saved:
+// https://web.archive.org/web/20201112012219/https://plusbryan.com/my-first-5-minutes-on-a-server-or-essential-security-for-linux-servers
+//
+//         I tried digging up something similar and this one seems to be based on
+// the "First Five Minutes on a Server":
+// https://blog.codelitt.com/my-first-10-minutes-on-a-server-primer-for-securing-ubuntu/
+//
+// I wanted to find something more community-maintained or more of a "standard"
+// knowledge-base, but both OWASP and the Cloud Security Alliance provide more
+// general and/or less hands-on writings.
 I can definitely recommend the eye-opening experience of installing
 fail2ban and watching its logfiles to see just how quickly it picks up on
 random drive-by attempts to brute force your SSH login.  The internet is a
@@ -1112,13 +1126,18 @@ and lots, lots more to learn besides.
 Here are some resources I used for inspiration:
 
 
-* http://12factor.net/[The 12-factor App] by the Heroku team
+* https://12factor.net/[The 12-factor App] by the Heroku team
 
 * http://hynek.me/talks/python-deployments[Solid Python Deployments for Everybody] by Hynek Schlawack
+// CSANAD: the author suggests another, slightly more up-to date (from 2018)
+//         talk now: https://hynek.me/talks/deploy-friendly/
 
 * The deployment chapter of
   https://www.feldroy.com/books/two-scoops-of-django-3-x[Two Scoops of Django]
   by Dan Greenfeld and Audrey Roy
+// CSANAD: this is 404 now. The book no longer seems to have a separate page
+//         instead, they list all their books at
+// https://www.feldroy.com/two-scoops-press
 
 
 

server-quickstart.md

@@ -1,7 +1,7 @@
 # Ultra-brief instructions for how to get a Linux server
 
 These instructions are meant as companion to the 
-[deployment chapter of my book](http://www.obeythetestinggoat.com/book/chapter_09_docker.html).
+[deployment chapter of my book](https://www.obeythetestinggoat.com/book/chapter_11_ansible.html).
 They're almost telegraphic in style, but I hope they're better than nothing!
 
 
@@ -23,7 +23,7 @@ ssh-keygen
 
 **NOTE** *If you're on Windows, you need to be using Git-Bash for `ssh-keygen`
 and `ssh` to work. There's more info in the
-[installation instructions chapter](http://www.obeythetestinggoat.com/book/pre-requisite-installations.html)*
+[installation instructions chapter](https://www.obeythetestinggoat.com/book/pre-requisite-installations.html)*
 
 Just accept all the defaults if you really want to just get started in a hurry,
 and no passphrase.
@@ -39,8 +39,8 @@ Make a note of your "public key"
 cat ~/.ssh/id_rsa.pub
 ```
 
-More info on public key authentication [here](https://www.linode.com/docs/networking/ssh/use-public-key-authentication-with-ssh/)
-and [here](https://www.digitalocean.com/community/tutorials/how-to-use-ssh-keys-with-digitalocean-droplets)
+More info on public key authentication [here](https://www.linode.com/docs/guides/use-public-key-authentication-with-ssh/)
+and [here](https://docs.digitalocean.com/products/droplets/how-to/add-ssh-keys/)
 
 
 ## Start a Droplet