Add first draft of systemd services. Fix #14 Implement #43

Author: axilleas

init/systemd/README.md

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+## GitLab startup services for systemd (Archlinux, Fedora, etc)
+
+GitLab requires a couple of services:
+* Web server (apache, nginx, etc.)
+* Redis server
+* Mail server (postfix or other)
+* GitLab Sidekiq service (`gitlab-sidekiq.service`)
+* Unicorn (`gitlab-unicorn.service`)
+
+
+## Setup GitLab Sidekiq service
+
+Copy files to `/etc/systemd/system/`:
+
+```
+su -
+cd /etc/systemd/system/
+wget -O gitlab-sidekiq.service https://raw.github.com/gitlabhq/gitlab-recipes/master/init/systemd/gitlab-sidekiq.service
+wget -O gitlab-unicorn.service https://raw.github.com/gitlabhq/gitlab-recipes/master/init/systemd/gitlab-unicorn.service
+wget -O gitlab.target https://raw.github.com/gitlabhq/gitlab-recipes/master/init/systemd/gitlab.target
+```
+
+Reload systemd: 
+
+    sudo systemctl --system daemon-reload
+    
+Start the services:
+
+    sudo systemctl start gitlab-sidekiq gitlab-unicorn
+    
+Enable them to start at boot:
+
+    sudo systemctl enable gitlab-sidekiq gitlab-unicorn
+
+## Notes
+
+If you installed GitLab in other path than `/home/git/gitlab` change the service files accordingly.
+
+`/etc/systemd/system/` have a higher precedence over  `/lib/systemd/system`.
+
+For older systemd versions you need to append `service` after the service name. For example:
+
+    sudo systemctl start gitlab-sidekiq.service

init/systemd/gitlab-sidekiq.service

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+[Unit]
+Description=GitLab Sidekiq Worker
+Requires=redis.service
+After=syslog.target network.target redis.service
+Wants=mysqld.service
+
+[Service]
+Type=forking
+User=git
+WorkingDirectory=/home/git/gitlab
+Environment=RAILS_ENV=production
+SyslogIdentifier=gitlab-sidekiq
+PidFile=/home/git/gitlab/tmp/pids/sidekiq.pid
+
+ExecStart=/usr/bin/bundle exec rake sidekiq:start
+ExecStop=/usr/bin/bundle exec rake sidekiq:stop
+
+[Install]
+WantedBy=gitlab.target

init/systemd/gitlab-unicorn.service

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+[Unit]
+Description=GitLab Unicorn Server
+Requires=redis.service
+After=network.target mysqld.service redis.service
+
+[Service]
+User=git
+WorkingDirectory=/home/git/gitlab
+Environment=RAILS_ENV=production
+SyslogIdentifier=gitlab-unicorn
+PidFile=/home/git/gitlab/tmp/pids/unicorn.pid
+
+ExecStart=/usr/bin/bundle exec "unicorn_rails -c /home/git/gitlab/config/unicorn.rb -E production"
+
+[Install]
+WantedBy=gitlab.target

init/systemd/gitlab.target

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+[Unit]
+Description=GitLab - Self Hosted Git Management
+
+[Install]
+WantedBy=multi-user.target