Requirements

1. R -v 3.2.0
2. Shiny -v latest

Package Dependencies

1. plyr
2. RSQLite
3. openair
4. reshape2

RStudio (Local Machine)

Openair Installation

Go to,

https://github.com/davidcarslaw/openair

Type these lines below in R or RStudio console:

require(devtools)
install_github('davidcarslaw/openair')

In case you can't install devtools, run these lines below in your terminal, then run the lines above again in your R's:

$ sudo apt-get -y build-dep libcurl4-gnutls-dev
$ sudo apt-get -y install libcurl4-gnutls-dev

Ref:

1. http://stackoverflow.com/questions/30794035/install-packagesdevtools-on-r-3-0-2-fails-in-ubuntu-14-04
2. http://stackoverflow.com/questions/20923209/problems-installing-the-devtools-package

Ubuntu Linux (Localhost)

Install Shiny Server

Paste these below on your terminal:

$ sudo apt-get install r-base

$ sudo su - \
-c "R -e \"install.packages('shiny', repos='https://cran.rstudio.com/')\""

$ sudo apt-get install gdebi-core
$ wget https://download3.rstudio.org/ubuntu-12.04/x86_64/shiny-server-1.4.1.759-amd64.deb
$ sudo gdebi shiny-server-1.4.1.759-amd64.deb

Grant Permissions

Now we have the directory structure for our files, but they are owned by our root user. If we want our regular user to be able to modify files in our web directories, we can change the ownership by doing this:

$ sudo chown lau.users /srv/shiny-server/

Upstart (Ubuntu 12.04 through 14.10, RedHat 6)

$ sudo start shiny-server
$ sudo stop shiny-server
$ sudo restart shiny-server

Install packages

$ sudo su - -c "R -e \"install.packages('plyr', repos='http://cran.rstudio.com/')\""
$ sudo su - -c "R -e \"install.packages('RSQLite', repos='http://cran.rstudio.com/')\""
$ sudo su - -c "R -e \"devtools::install_github('davidcarslaw/openair')\""
$ sudo su - -c "R -e \"install.packages('reshape2', repos='http://cran.rstudio.com/')\""
$ sudo su - -c "R -e \"install.packages('memoise', repos='http://cran.rstudio.com/')\""
$ sudo su - -c "R -e \"install.packages('maps', repos='http://cran.rstudio.com/')\""

The config file for Shiny Server is at /etc/shiny-server/shiny-server.conf.

Ref:

1. http://rstudio.github.io/shiny-server/latest/#r-installation-location
2. https://www.rstudio.com/products/shiny/download-server/
3. http://www.r-bloggers.com/how-to-get-your-very-own-rstudio-server-and-shiny-server-with-digitalocean/

System Performance Monitoring

Using command top, we can get the Process ID (PID), CPU/Memory usage for each shiny app.

$ top -u shiny

netstat is a command-line tool that displays all network connections. It can list all connections to a shiny app by specifing its Process ID (PID) using command:

$ sudo netstat -p | grep <PID>

Now, we have known the CPU/Memory performance and connections number for each shiny app, however, we still don’t know the name of each shiny app, which can be get using command lsof:

$ sudo lsof -p <PID> | grep DIR

Ref:

1. http://tagteam.harvard.edu/hub_feeds/1981/feed_items/536189

Cron Task

1. Create shiny-system folder via terminal:

   $ mkdir /srv/shiny-system/

2. Create cron folder and keep cpu.R in this folder.

3. Start the crontab editor from a terminal window,

   $ crontab -e

4. Add entries to your own user's crontab file,

   $ * * * * * Rscript /srv/shiny-system/cron/specks/cpu.R $ * * * * * Rscript /srv/shiny-system/cron/fracks/cpu.R

Arch Linux

Check release

To check what Linux release you are running on your server:

$ cat /etc/*-release

NAME="Arch Linux"
ID=arch
PRETTY_NAME="Arch Linux"
ANSI_COLOR="0;36"
HOME_URL="https://www.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://bugs.archlinux.org/"

Install net-tools for netstat

You should Arch package manager - pacman to install net-tools:

$ sudo pacman -S net-tools

Install cronie

Install cronie for running cron tasks:

$ sudo pacman -Syu cronie

Then enable it:

$ sudo systemctl enable --now cronie.service

Check its status:

$ systemctl status cronie

Start it:

$ sudo systemctl start crond

[citizensense@localhost ~]$ sudo systemctl enable --now cronie.service
Created symlink from /etc/systemd/system/multi-user.target.wants/cronie.service to /usr/lib/systemd/system/cronie.service.

Ref:

1. https://wiki.archlinux.org/index.php/Cron
2. https://wiki.archlinux.org/index.php/Systemd/Timers#Management status crond

Set editor

Set editor to your editor:

$ sudo export EDITOR=vim

Add cront tasks (as a user)

Note that adding cron tasks as a user does not work on the production/ live server:

$ crontab -e

* * * * * Rscript /srv/shiny-system/cron/specks/cpu.R
* * * * * Rscript /srv/shiny-system/cron/fracks/cpu.R
~
~
"/tmp/crontab.8VZ7vq" 1 line, 47 characters

Add cront tasks (as a root)

On the production server, you should add the cron task as a root or the tasks won't not be executed:

$ sudo crontab -e

* * * * * Rscript /srv/shiny-system/cron/specks/cpu.R
* * * * * Rscript /srv/shiny-system/cron/fracks/cpu.R
~
~
"/tmp/crontab.8VZ7vq" 1 line, 47 characters

Add vim to your crontab editor env that makes it easy to edit the cron tasks:

$ sudo EDITOR=vim crontab -e

You can run the cpu.R manually by type this in your terminal,

$ Rscript /srv/shiny-system/cron/specks/cpu.R
$ Rscript /srv/shiny-system/cron/fracks/cpu.R

Ref:

1. https://bbs.archlinux.org/viewtopic.php?id=78700
2. https://archlinuxarm.org/forum/viewtopic.php?f=53&t=6281

List cron tasks

Check what tasks are running:

$ sudo crontab -l

Final notes

1. Make sure /srv/shiny-system/cron/specks/ folder is set to 777, and cpu.R is set to be executable.
2. Make sure /srv/shiny-server/specks/speck<1-4>/ folders are set to 777, and log.txt in each of them is set to to 777.