= Setup of a Cinnamon Server on Debian 10.1.0 (buster)
> **NOTE:** This documentation is currently under construction.

> This documentation relates to Debian 10.1.0 Server (without GUI).[[br]]Particularly, it relates to a minimal Debian server VM installed from the Debian repositories on the KVM virtualization host.[[br]]The installation according to this documentation has been tested on a system of this type.

== Installing Cinnamon Server
* Log in to the standard Debian 10.1.0 VM (this is a minimal installation with {{{ssh}}} as the only option).
> **IMPORTANT:** Choose a safe password on production systems (see [#ref1 (1)]).
* Use the {{{su}}} command to acquire root privileges.
* Edit {{{~/.bashrc}}} and append the following line:
 {{{
 PATH=$PATH:/usr/sbin
 }}}
* Exit and use the {{{su}}} command again to make the previous change effective.
* Install Java (JDK), cURL and some other useful or required tools. When the installer asks you, deny mounting WebDAV resources to unprivileged users.
 {{{
 apt update
 apt-get install curl sudo less daemontools rsync davfs2 htop zip unzip sshpass apt-transport-https ca-certificates wget dirmngr gnupg software-properties-common
 wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add -
 add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/
 apt update
 apt install adoptopenjdk-8-hotspot
 }}}
* In case other Java versions had been installed on the system before (like Java 11), select Java 8 with the following command:
 {{{
 update-alternatives --config java
 }}}
* Create a new group and user for tomcat.
 {{{
 groupadd tomcat
 useradd -s /bin/false -g tomcat -d /opt/tomcat tomcat
 mkdir /opt/tomcat
 }}}
 * The home directory of this account is set to {{{/opt/tomcat}}}.
 * The shell of this account is set to {{{/bin/false}}}, so logging on is not possible.
* Download and extract tomcat.
 {{{
 cd /tmp 
 curl -O https://archive.apache.org/dist/tomcat/tomcat-8/v8.5.38/bin/apache-tomcat-8.5.38.tar.gz
 tar xzvf apache-tomcat-8.5.38.tar.gz -C /opt/tomcat --strip-components=1
 chgrp -R tomcat /opt/tomcat
 cd /opt/tomcat
 chown -R tomcat webapps/ work/ temp/ logs/
 chmod -R g+r conf
 chmod g+x conf
 chmod -R g+rw logs
 }}}
* Create a Tomcat service.
 * Create the service file.
  {{{
  nano /etc/systemd/system/tomcat.service
  }}}
 * Paste the following code into the file:
  {{{
  [Unit]
  Description=Apache Tomcat Web Application Container
  After=network.target

  [Service]
  Type=forking

  Environment=JAVA_HOME=/usr/lib/jvm/adoptopenjdk-8-hotspot-amd64/jre
  Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
  Environment=CATALINA_HOME=/opt/tomcat
  Environment=CATALINA_BASE=/opt/tomcat
  Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

  ExecStart=/opt/tomcat/bin/startup.sh
  ExecStop=/opt/tomcat/bin/shutdown.sh

  User=tomcat
  Group=tomcat
  UMask=0007
  RestartSec=10
  Restart=always

  [Install]
  WantedBy=multi-user.target
  }}}
 * Save and close the file.
* Start and test Tomcat.
 {{{
 systemctl daemon-reload
 systemctl start tomcat
 systemctl status tomcat
 }}}
 Alternatively, you can use the following syntax to control the tomcat service:
 {{{
 service tomcat start
 service tomcat stop
 service tomcat status
 }}}
* Stop tomcat.
 {{{
 service tomcat stop
 }}}
* Install PostgreSQL database.
 {{{
 apt-get install postgresql
 }}}
* Set password for user {{{postgres}}}.
> **NOTE:** This is required for backup and restore.
 {{{
 sudo -u postgres psql template1
 ALTER USER postgres PASSWORD 'myPassword';
 \q
 }}}
* Create a database user {{{cinnamon}}}.
 * Start the user creation program.
  {{{
  sudo -u postgres createuser --interactive
  }}}
 * Answer the questions as follows:
||=**Question** =||=**Answer** =||
||Enter the name of the role to add: ||{{{cinnamon}}} ||
||Shall the new role be a superuser? ||{{{n}}} ||
||Shall the new role be allowed to create databases? ||{{{n}}} ||
||Shall the new role be allowed to create more new roles? ||{{{n}}} ||
 * Set a password for the user.
 > **IMPORTANT:** Choose a safe password on production systems (see [#ref1 (1)]).
  {{{
  sudo -u postgres psql
  ALTER USER "cinnamon" WITH PASSWORD 'new_password';
  \q
  }}}
* Assign password to user cinnamon and add it to the tomcat group.
> **IMPORTANT:** Choose a safe password on production systems (see [#ref1 (1)]).
 {{{
 useradd -g tomcat -d /opt/cinnamon cinnamon
 passwd cinnamon
 mkdir /opt/cinnamon
 }}}
* Create a file {{{/opt/tomcat/bin/setenv.sh}}} and paste the following content into it:
 {{{
 export CATALINA_OPTS="$CATALINA_OPTS -Xms32m"
 export CATALINA_OPTS="$CATALINA_OPTS -Xmx4g"
 export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"
 export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxGCPauseMillis=750"
 export CATALINA_OPTS="$CATALINA_OPTS -XX:GCTimeRatio=9"
 export CATALINA_OPTS="$CATALINA_OPTS -server"
 export CATALINA_OPTS="$CATALINA_OPTS -XX:+DisableExplicitGC"
 export CINNAMON_HOME_DIR="/opt/cinnamon/cinnamon-system"
 }}}
* Set the permissions to the file {{{/opt/tomcat/setenv.sh}}}.
 {{{
 chmod ug+x /opt/tomcat/bin/setenv.sh
 }}}
* Upload {{{cinnamon.zip}}} to {{{/home/install}}}.
* Unzip the required files and move Cinnamon content and system files to the correct location: 
 {{{
 cd /home/install
 unzip cinnamon.zip
 cd cinnamon
 mv cinnamon-data /opt/cinnamon
 mv cinnamon-system /opt/cinnamon
 }}}
* Create database and import SQL dump.
 {{{
 sudo -u postgres psql template1
 create database content with owner=cinnamon;
 \q
 sudo -u postgres psql content < /home/install/cinnamon/content.sql 
 }}}
* Change the owner and permissions of the Cinnamon directories.
 {{{
 cd /opt/cinnamon
 chown -R cinnamon:tomcat cinnamon-data
 chown -R cinnamon:tomcat cinnamon-system
 chmod -R 770 cinnamon-data
 chmod -R 770 cinnamon-system
 chown -R tomcat:tomcat /opt/tomcat/webapps/cinnamon.war
 }}}
* Edit the password settings in the config files. TODO details
* Move {{{cinnamon.war}}} and change its owner.
 {{{
 mv /home/install/cinnamon/cinnamon.war /opt/tomcat/webapps
 chown -R tomcat:tomcat /opt/tomcat/webapps/cinnamon.war
 }}}
* Set Tomcat service to start automatically.
 {{{
 systemctl enable tomcat
 }}}
* Start Tomcat.
 {{{
 service tomcat start
 }}}

== Installing Cinnamon Asynchronous Engine (CAE)
* Create a new group and user for CAE.
 {{{
 groupadd cae
 useradd -s /bin/bash -g cae -d /opt/cae cae
 mkdir /opt/cae
 }}}
 * The home directory of this account is set to {{{/opt/cae}}}.
 * The shell of this account is set to {{{/bin/bash}}}. For debugging purposes, it is useful to log on as the CAE user and run CAE from the shell.
 * Optionally, the shell can be set to {{{/bin/false}}}, disabling login as CAE user. Instead, testing can be performed as root.
* Unzip the file {{{cae.zip}}} to {{{/opt/cae}}}.
* Install dependencies, particularly mono from their repository (instead of the Debian packages).
 {{{
 apt-get install apt-transport-https dirmngr gnupg ca-certificates
 apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 echo "deb https://download.mono-project.com/repo/debian stable-stretch main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
 apt update
 apt-get install mono-complete ca-certificates-mono imagemagick
 }}}
* Configure CAE.
 * Edit the configuration file.
  {{{
  nano /opt/cae/bin/CinnamonAsynchronousEngine.config.xml
  }}}
 * Set the user credentials.
 > **NOTE:** Details will follow.
* Transfer folder structure to user {{{cae}}}.
 {{{
 chgrp -R cae /opt/cae
 chown -R cae /opt/cae
 chmod -R 770 /opt/cae
 }}}
* Set owner and permission to script.
 {{{
 chgrp cae /opt/cae/bin/cae.sh
 chown cae /opt/cae/bin/cae.sh
 chmod a+x /opt/cae/bin/cae.sh
 }}}
* Set the script to be automatically started, and restarted when it exits (for any reason).
 * Copy {{{cae.sh}}} to {{{run}}}.
  {{{
  cp /opt/cae/bin/cae.sh /opt/cae/bin/run
  }}}
 * Create the {{{crontab}}}.
  {{{
  crontab -e
  }}}
 * Append the following code at the end of the crontab.
 > 120 seconds sleep time is on the safe side. On most systems, much shorter times work safely, e. g. 30 seconds. If the sleep time is too short, the process may fail to start correctly, so do not configure this value too small.
  {{{
  @reboot sleep 120; supervise /opt/cae/bin
  }}}
 * Save and close the file.

== Backup
Cinnamon itself does not contain a backup mechanism, since all data is contained in the PostgreSQL database and the content files. Both can be backed up with operation system or database standard means.

The backup configuration in detail depends on the system environment and the available backup target.

A sample configuration, using {{{rsync}}} to copy the content and the standard database dump utility to backup the database can be found in reference [#ref2 (2)]. The configuration described there is successfully used in several production systems and has the advantage to avoid huge content transfer every night due to the differential {{{rsync}}} function.

== References

* [=#ref1 (1)] [wiki:Public/Docs/SafePasswords Safe passwords]
* [=#ref2 (2)] [wiki:Public/Docs/CinnamonBackupRestore Backup and restore of a Cinnamon repository]