Redmine

h2. Sidekiq configuration

"Sidekiq":https://sidekiq.org/ is one of the more widely used background job frameworks that you can configure as queuing backend. I've tested to following install and configuration steps on a fresh Ubuntu 18.04 with Redmine 4.1.1, Redis version 4 and Sidekiq 6.

h3. 1. Prerequisites:

# Install redis-server. 

h3. 2. Install sidekiq

# Add the gem as dependency in @Gemfile.local@ file. If the file doesn't exist, you need to create it.

<pre>

gem 'sidekiq'

</pre>

# Run @bundle install@ to install the dependency

h3. 3. Configure Redmine to use @sidekiq@ as backend

# Create @config/additional_environment.rb@ file if the file does not exist by copying the existing example file:

<pre>

cp config/additional_environment.rb.example config/additional_environment.rb

</pre>

# Add the below config line to the file:

<pre>

config.active_job.queue_adapter = :sidekiq

</pre>

# Restart Redmine to reload the configuration file.

h3. 4. Test the configuration

# Browse to Information tab from Redmine Administration page and check the mailer queue value:

<pre>

  Mailer queue                   ActiveJob::QueueAdapters::SidekiqAdapter

</pre> 

# Perform some actions in Redmine in order to trigger some notifications emails. In this step, Redmine only pushes the background jobs to Sidekiq backend.

# Temporary start sidekiq in order to process the queue and send the emails:

<pre>

RAILS_ENV=production bundle exec sidekiq

</pre>

    Output example of startup process:

<pre>

2020-06-13T15:08:12.470Z pid=23782 tid=gqluhczs2 INFO: Booted Rails 5.2.4.2 application in production environment

2020-06-13T15:08:12.470Z pid=23782 tid=gqluhczs2 INFO: Running in ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu]

2020-06-13T15:08:12.470Z pid=23782 tid=gqluhczs2 INFO: See LICENSE and the LGPL-3.0 for licensing details.

2020-06-13T15:08:12.470Z pid=23782 tid=gqluhczs2 INFO: Upgrade to Sidekiq Pro for more features and support: https://sidekiq.org

2020-06-13T15:08:12.471Z pid=23782 tid=gqluhczs2 INFO: Booting Sidekiq 6.0.7 with redis options {}

</pre>

    Output example of job processing:

<pre>

2020-06-13T14:53:19.773Z pid=23268 tid=gmo48ykw4 class=ActionMailer::DeliveryJob jid=0b1943f5a675330944781492 INFO: start

2020-06-13T14:53:21.171Z pid=23268 tid=gmo48ykw4 class=ActionMailer::DeliveryJob jid=0b1943f5a675330944781492 elapsed=1.397 INFO: done

</pre>

# If everything went well, stop the command. 

h3. 5. Configure sidekiq to run as a system service

# Follow the official steps described in https://github.com/mperham/sidekiq/wiki/Deployment#running-your-own-process

# The above steps points to a @sidekiq.service@ example file which can be used to configure the service

# During service configuration, at least the following information must be provided:

    * @WorkingDirectory@

    * @User@

    * @Group@

    I recommend to carefully read all the instructions and how to configure the service.

# Enable and start the service:

<pre>

sudo systemctl enable sidekiq 

sudo systemctl start sidekiq 

</pre>

# Test again the email notifications