cloud-config script to setup Rstudio server and Shiny server on Ubuntu 14.04 on Digital Ocean

rstudio-cc.yml

#cloud-config

# In order to access RStudio server via the web interface, you must log on with
# a user account that allows password access. This script does not add that user
# by default. You may either ssh as root into the server and `adduser` as
# normal, or script a user addition here:

# users:
#   - name: # username #
#     lock-passwd: false # allow login with password
#     passwd: # hashed password #

# Add apt mirror to get the latest version of R necessary for Shiny
apt_sources:
  - source: deb https://cran.rstudio.com/bin/linux/ubuntu/ trusty/
    keyid: E084DAB9
package_upgrade: true
packages:
  - nginx
  - libxml2-dev
  - libcurl4-gnutls-dev
  - libssl-dev
  - r-base-dev
  - libapparmor1
  - gdebi-core
  - git-core
write_files:
  # Forward ports for Rstudio and Shiny
  - path: /etc/nginx/sites-enabled/default
    content: |
      server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;

        root /usr/share/nginx/html;
        index index.html index.htm;

        # Make site accessible from http://localhost/
        server_name localhost;

        location / {
          # First attempt to serve request as file, then
          # as directory, then fall back to displaying a 404.
          try_files $uri $uri/ =404;
          # Uncomment to enable naxsi on this location
          # include /etc/nginx/naxsi.rules
        }

        location /shiny/ {
          proxy_pass http://127.0.0.1:3838/;
        }

        location /rstudio/ {
          proxy_pass http://127.0.0.1:8787/;
        }
      }
runcmd:
  # Install "shiny" package for R
  - R -e 'install.packages(c("shiny", "rmarkdown"), repos="https://cran.rstudio.com/")'
  # Download and install rstudio-server
  - wget https://download2.rstudio.org/rstudio-server-0.99.892-amd64.deb
  - gdebi -n rstudio-server-0.99.892-amd64.deb
  # Download and install Shiny
  - wget https://download3.rstudio.org/ubuntu-12.04/x86_64/shiny-server-1.4.2.786-amd64.deb
  - gdebi -n shiny-server-1.4.2.786-amd64.deb
  # Clean package files
  - rm *.deb
  - service nginx restart

This is totally indebted to Dean Attali's tutorial on how to manually set up RStudio server and Shiny on DO.

line 16: Using only the short form to identify the key seems to be ambiguous and renders whole package signing useless:

# gpg --receive-keys E084DAB9
gpg: key 4359ED62E084DAB9: public key "Totally Legit Signing Key <mallory@example.org>" imported
gpg: key 51716619E084DAB9: public key "Michael Rutter <marutter@gmail.com>" imported
gpg: Total number processed: 2
gpg:               imported: 2

Use the full fingerprint instead, E298A3A825C0D65DFD57CBB651716619E084DAB9.