<a id="xxx">). Anchor tags are typically used to create links and include an href attribute that holds the URL of the linked document.
Continue reading “Adding anchors to our Shiny button observer”
One of the profound limitations of Shiny is the way it supports buttons. Buttons are based on a function called actionButton(). When a button is clicked, Shiny reports the click on input$button_id. Every button has to have a unique id, which means that each button also has to have its own observer to watch for a click. But what if you want to do something like this:
Today I decided to try adding the RStudio Server to my Amazon Lightsail instance. There are three steps to this – downloading and installing the software, opening up port 8787, and adding a user with a password who can log in to the server.
Continue reading “Adding RStudio to an Amazon Lightsail Instance”
This week my fellow doctoral students see the first live demonstration (and alpha-test) of the Open-Meta app. Before loading the code onto AWS, I decided to start a new instance and update the installation scripts.
Continue reading “LEMRS Scripts Update to version 0.2”
Recording what date and time something happened and reporting it back to users is complicated in multi-user web applications.
Continue reading “R time to our time in multi-user Shiny web applications”
So many choices! In previous blogs I’ve talked about the traditional LAMP stack, in which the “M” stands for the open-source MySQL database engine. I barely understand the details, but somehow Oracle now owns MySQL. There’s still a free open-source version, often referred to as the community edition. Some open-source developers weren’t happy about the Oracle switch, however, and “forked” the MySQL code into a new project called MariaDB.
Continue reading “Installing and configuring a database engine like MySQL or MariaDB on Amazon Lightsail”
Connections from your own computer to your instance on Amazon Lightsail are made using SSH keys rather than passwords. Here are some tips for setting up connections between some useful Windows programs and your instance.
Continue reading “How to connect to Amazon Lightsail with PuTTY, FileZilla, WinSCP, and HeidiSQL”
In my last post I talked about the strategy I used to figure out what should go into a LEMRS launch script. A major theme of this post is that I now know more about Linux than I ever have before and ever will again, so I’m trying to document what I’ve done and otherwise take care of future me when I have to get back in and update all this stuff. [NOTE: There is now an updated version of this script.]
Continue reading “Launch script for a LEMRS stack on Amazon Lightsail”