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Ruby stack containers


See AthenaPDF stack documentation.


If Mailhog service enabled and chosen as Mail delivery service at [Instance] > Stack > Settings all outbound email will be caught by the Mailhog. You can view and release these emails from Mailhog UI, the URL can be found from Domains tab. When release specify opensmtpd in SMTP server field if you want to release emails to the default Mail transfer agent (OpenSMTPD).


See MariaDB stack documentation.


You can check the status of memcached and its hits by running the following command.

watch "echo stats | nc 11211"


Light-weight node.js container to help you build your application's frontend. The containers comes without any global pre-installed packages, you can add them by running yarn global add PACKAGE or by running yarn in a directory with your package.json file.


Nginx can be configured with the following environment variables

Restarting nginx as default user:

sudo nginx -s reload

Do not gzip pages in your application

We already gzip content on Nginx side and it works faster. Having double gzip may cause issues.


Installed nginx modules.


Nginx comes with mod_pagespeed which is disabled by default. To enable it add NGINX_PAGESPEED_ENABLED=1 environment variable to Nginx service. For more details see

ModSecurity + OWASP

Nginx comes with ModSecurity which is disabled by default. To enable it add NGINX_MODSECURITY_ENABLED=1 environment variable to Nginx service. For more details see

Custom config

If a config preset and available environment variables are not enough for your customizations you can use your own virtual host config:

  1. Copy /etc/nginx/conf.d/vhost.conf to your codebase, adjust to your needs
  2. Deploy code with your config file
  3. Add new environment variable NGINX_CONF_INCLUDE for nginx service, the value should the path to your *.conf file (e.g. /var/www/html/vhost.conf). The specified file will be included in /etc/nginx/nginx.conf

Default virtual host preset: http-proxy


See OpenSMTPD stack documentation.


See PostgreSQL stack documentation.


See Redis stack documentation.


See Drupal stack documentation.


Rsyslog can be used to stream your applications logs. It's similar to using syslog, however there's no syslog in Ruby container (one process per container). Rsyslog will stream all incoming logs to a container output.


Ruby can be configured with the following environment variables. By default the container starts Puma HTTP server.


A duplicate of the main Ruby container runs with Sidekiq (instead of HTTP server).


See Varnish stack documentation.