Linux server configuration and administration services

Gentoo, Red Hat, Oracle, CentOS, Arch, Debian, Ubuntu, and derivatives of these.
Configuration management
Server automation, such as monitoring and housekeeping tasks, new server templates, etc.
Software patch/update planning and implementation for production, UAT, and test/dev environments
Software management, internal repositories
Linux-Active Directory integration, Kerberos authentication
Database migration from MS SQL to MySQL, MariaDB, PostegreSQL
SSL certificate management
Apache and NGINX web server administration
Sendmail and Postfix e-mail server administration
DNS and domain names management
Monitoring of critical applications