CentOS 6 is EOL

[xxMAKMAKxx]

While trying to isntall Salt, I have encountered following error:

[vagrant@master ~]$ sudo yum list salt salt-master salt-minion Failed to set locale, defaulting to C Loaded plugins: fastestmirror Determining fastest mirrors YumRepo Error: All mirror URLs are not using ftp, http[s] or file. Eg. Invalid release/repo/arch combination/ removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt Error: Cannot find a valid baseurl for repo: base

it seems the cause is because CentOS 6 reached end of life on the 30th November 2020 and now the image is connecting to deprecated repositories URL end-points. Probabyl the best would be to switch to CentOS 7 or even 8 (not sure how much dependencies on the OS are in the code).

[craig5]

If you can verify the fix on branch "update-images" works for you, I'll merge it into master.
Thanks!

[xxMAKMAKxx]

It seems you have added dependency for the following plugin: vagrant-vbguest which I didn't originally have. And got following error:

There are errors in the configuration of this machine. Please fix
the following errors and try again:

Vagrant:
* Unknown configuration section 'vbguest'.

upon installing it all works. Vagrant should be able to add plugin dependency to Vagrantfile:

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vagrant.plugins = "vagrant-vbguest"
  nodes.each do |node|

which will prompt install upon vagrant up command:

(...) vagrant up
Vagrant has detected project local plugins configured for this
project which are not installed.

  vagrant-vbguest
Install local plugins (Y/N) [N]:

[xxMAKMAKxx]

BTW I wonder why have you added this dependency? It started installation of kernel update which makes the Vagrant up command takes a lot of time :-) I tried with only changing to CentOS 7 which worked fine for me.

[xxMAKMAKxx]

BTW one more thing I remembered. CentOS 8 might go EOL sooner due to Centos Stream (https://endoflife.software/operating-systems/linux/centos). Maybe using 7 will be even better in this case. I was testing the change on my machine with following line changed:
os_centos = "bento/centos-7.7"

and all worked fine. I didn't install any VB additions.

[xxMAKMAKxx]

Just BTW, in centos/8 the Python is missing and needs to be installed. I understand any1 can probably do the install but it might create some discrepancy in the book's appendix. Maybe wrapping the install in a Bash script that will install the Python based on OS version? Whatever you prefer.