This article describes how to add Google Authenticator (one of two step authentication system) to SSH service.
This article describes how to prepare production level app running environment, using uWSGI which works on mediating between Python Web application and Web server like nginx.
Note about how to configure nginx to work with CGI written in Python.
To check server availability, build monitoring system using Zabbix + Slack.
If you run e-mail server system by one server, not use redundant setup, you may have risks about can't receive/send e-mails. This article describes how to configure redundant e-mail server to avoid problem.
Describe how to migrate GnuPG.