Opsgility Official Training

Red Hat System Administration Iii With Rhcsa And Rhce Exams (Rh255)

Students in a classroom-min

Course Description

Red Hat System Administration III (RH255), related to Red Hat Enterprise Linux 7, is designed for experienced Linux system administrators who hold a Red Hat Certified System Administrator (RHCSA) certification or equivalent skills and who want to broaden their ability to administer Linux systems at an enterprise level. 

The course is focused on deploying and managing network servers running caching Domain Name Service (DNS), MariaDB, Apache HTTPD, Postfix SMTP nullclients, network file sharing with Network File System (NFS) and Server Message Block (SMB), iSCSI initiators and targets, advanced networking and firewalld configurations, and using Bash shell scripting to help automate, configure, and troubleshoot the system. 

Through lectures and hands-on labs, RHCSA-certified professionals will be exposed to all competencies covered by the Red Hat Certified Engineer (RHCE) exam. This course includes the RHCSA and RHCE exams. 

This title is comprised of RH254, EX200, and EX300. If you are not looking for private group training, the updated schedule can be found on the RH254 course page. You may also call your training advisor for more information. 

Note: This course does not cover all RHCSA tasks. Students who need a review of RHCSA skills are encouraged to attend RHCSA Rapid Track Course (RH199). 

About this course

What You'll Learn

  • Network port security and link aggregation 
  • iSCSI initiator and target configuration 
  • DNS troubleshooting and caching name server 
  • Provisioning NFS and SMB file servers 
  • Apache HTTPD web server management 
  • MariaDB SQL database configuration 
  • Postfix SMTP nullclient for servers 
  • Bash scripting for automation 

Who Needs to Attend

  • Experienced Linux administrators who have earned RHCSA certification or have equivalent skills and wish to learn enterprise-level automation techniques through scripting, how to deploy and secure network services, and how to manage other key security features of Red Hat Enterprise Linux 


  • RHCSA certification or equivalent experience 

Course outline

  1. Control Services and Daemons 

Review how to manage services and the boot-up process using systemctl. 

  1. Manage IPv6 Networking 

Configure and troubleshoot basic IPv6 networking on Red Hat Enterprise Linux systems. 

  1. Configure Link Aggregation and Bridging 

Configure and troubleshoot advanced network interface functionality, including bonding, teaming, and local software bridges. 

  1. Control Network Port Security 

Permit and reject access to network services using advanced SELinux and firewalld filtering techniques. 

  1. Manage DNS for Servers 

Set and verify correct DNS records for systems and configure secure DNS caching. 

  1. Configure Email Delivery 

Relay all email sent by the system to an SMTP gateway for central delivery. 

  1. Provide Block-Based Storage 

Provide and use networked iSCSI block devices as remote disks. 

  1. Provide File-Based Storage 

Provide NFS exports and SMB file shares to specific systems and users. 

  1. Configure MariaDB Databases 

Provide a MariaDB SQL database for use by programs and database administrators. 

  1. Provide Apache HTTPD Web Service 

Configure Apache HTTPD to provide Transport Layer Security (TLS)-enabled websites and virtual hosts. 

  1. Write Bash Scripts 

Write simple shell scripts using Bash. 

  1. Bash Conditionals and Control Structures 

Use Bash conditionals and other control structures to write more sophisticated shell commands and scripts. 

  1. Configure the Shell Environment 

Customize Bash startup and use environment variables, Bash aliases, and Bash functions. 

  1. Linux Containers Preview 

Preview the capabilities of Linux containers, Docker, and other related technologies in Red Hat Enterprise Linux 7. 

  1. Comprehensive Review 

Practice and demonstrate knowledge and skills learned in Red Hat System Administration III. 

  1. RHCSA and RHCE exams 

Ready to get started?