====== R, RStudio server ======

  * R is a free software environment for statistical computing and graphics. ([[http://www.r-project.org/|site]])

Add to /etc/apt/sources.list.d/erre.list this line:
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<code>
deb http://cran.rstudio.com/bin/linux/ubuntu xenial/
</code>
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then
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<code>
# gpg --keyserver keyserver.ubuntu.com --recv-key E084DAB9
# gpg -a --export E084DAB9 | sudo apt-key add -
# apt-get update
# apt-get install r-base r-base-dev
</code>
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Enter R at prompt:
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<code>
R version 3.3.2 (2016-10-31) -- "Sincere Pumpkin Patch"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
</code>
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\\
  * RStudio IDE is a powerful and productive user interface for R. It’s free and open source. ([[http://www.rstudio.com|site]])
Download and install
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<code>
# apt-get install gdebi-core
# wget https://download2.rstudio.org/rstudio-server-1.0.136-amd64.deb
# gdebi rstudio-server-1.0.136-amd64.deb
</code>
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Configure reverse-proxy https
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<code>
# apt-get install apache2
# a2enmod proxy proxy_http proxy_wstunnel
# a2enmod ssl rewrite
# a2ensite default-ssl.conf
# a2dissite 000-default.conf
# nano -w /etc/apache2/sites-available/default-ssl.conf
</code>
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<code>
  <Proxy *>
    Allow from localhost
  </Proxy>
  
#  root path
#  RewriteEngine on
#  RewriteCond %{HTTP:Upgrade} =websocket
#  RewriteRule /(.*)     ws://localhost:8787/$1  [P,L]
#  RewriteCond %{HTTP:Upgrade} !=websocket
#  RewriteRule /(.*)     http://localhost:8787/$1 [P,L]
#  ProxyPass / http://localhost:8787/
#  ProxyPassReverse / http://localhost:8787/
#  ProxyRequests Off

# /rstudio/ path
  RewriteEngine on
  RewriteCond %{HTTP:Upgrade} =websocket
  RewriteRule /rstudio/(.*)     ws://localhost:8787/$1  [P,L]
  RewriteCond %{HTTP:Upgrade} !=websocket
  RewriteRule /rstudio/(.*)     http://localhost:8787/$1 [P,L]
  ProxyPass /rstudio/ http://localhost:8787/
  ProxyPassReverse /rstudio/ http://localhost:8787/
  ProxyRequests Off

</code>
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<code>
# service apache2 restart
</code>
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Limit connection from localhost
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<code>
nano -w /etc/rstudio/rserver.conf
</code>
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<code>
  www-address=127.0.0.1
</code>
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<code>
rstudio-server stop
rstudio-server start
</code>
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