Development Log: 2021-11-02

2021 November 2

Made a backup AMI:
    Scanalyst Backup 2021-11-02  ami-03331fe51ec62d4c2
        /           snap-072d19f4ae0d3caa2
        /server     snap-071181bf8049f01ed

Made a mirror backup to Juno.

To install, remove, or modify a plug-in, according to:
edit the ~/discourse/image/containers/app.yml file and modify
the lines after:
    - git clone
which clone the Git repositories of the plug-ins.  Then
rebuild the application with:
    cd ~/discourse/image
    ./launcher rebuild app

The problem with MathJax was that I had installed the plug-in
to which I was directed by a Web search, that being:
which I believe is actually linked to in several documents
on the Discourse site.  This is, in fact, an old version of the
plug-in which is no longer compatible with Discourse and
causes the errors we were encountering.  I finally found this
which says that one should now use the "Official MathJax
Support for Discourse", which is hosted at:
and has a clone address of:
I added this to app.yml and rebuilt Discourse as described
above and, after I remembered you have to manually enable a
newly-installed plug-in, it works perfectly with my
test document in the Sand Box:

Changed the permissions on the Sand Box so Moderators can
read/post/reply as well as Administrators.

You can centre text by using the following antiquated HTML:
    <div align="center">
    This some text to be centred.
You can also wrap the text with <p> </p> if you wish.  The HTML
sanitiser strips all class= and style= attributes, so you can't
use them.  It's ugly, but it works.
1 Like