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The Red Hat Certified System Administrator (RHCSA) certification equips the candidates with the skills to carry out the core system administration functions that are required in Red Hat Enterprise Linux environments. These individuals have a good understanding of critical tools for handling files, documentation, command-line environments, and directories, as well as are able to use them. They also have competence in creating simple shell scripts, configuring local storage, operating running systems, creating file systems, and managing security, among others.

Red Hat RHCSA and Its Target Audience

This certification is aimed at the experienced specialists looking to validate their Red Hat Enterprise Linux system administrators’ skills. It is also intended for the students who have participated in the Red Hat System Administration I and Red Hat System Administration II training and want to obtain the RHCSA certificate. Additionally, this sought-after certification suits the DevOps professionals who want to demonstrate their expertise in the container technology fundamentals.

Red Hat RHCSA and Its Prerequisites

The candidates for this certification must complete the Red Hat System Administration I and Red Hat System Administration II courses or the RHCSA Rapid Track training. The professionals with comparable work experience as a Red Hat Enterprise Linux administrator or a system administrator will not need to meet the course requirements as their expertise compensates for the training. Before taking the exam, the students should also review its objectives to gain an understanding of the areas that will be evaluated in the test.

Red Hat RHCSA and Its Qualifying Exam

Red Hat EX200 is a performance-based test that evaluates one’s knowledge of the common areas of system administration across different deployment scenarios and environments. The skills evaluated in the exam are the foundation for the field of system administration across different Red Hat products. The test has the allotted duration of 3 hours and can be taken in-person at a center or as an online proctored exam. The registration process for the test costs $450.

The Red Hat RHCSA exam measures the individuals’ competence in executing the specific technical tasks. These tasks are grouped into several domains. The details of these areas are highlighted below:

Domain 1: Understanding and Using Essential Tools

This topic requires that the test takers develop competence in the following technical areas:

• Evaluating issue commands and shell prompt with appropriate syntax;
• Utilizing input-output redirection;
• Utilizing regular expressions and grep to evaluate text;
• Evaluating remote systems with the use of SSH;
• Logging in and changing the users in multi-user targets;
• Archiving, unpacking, compressing as well as uncompressing files with star, tar, bzip2, and gzip;
• Creating copy, deleting, and moving directories and files;
• Creating soft and hard links;
• Creating and editing different text files;
• Listing, changing and setting standard rwx/ugo permissions;
• Establishing, using, and reading system documentation, including man, files, and info in usr/share/doc.

Domain 2: Creating Simple Shell Scripts

To tackle the questions from this objective, the examinees need to develop the following skills:

• Unconditionally executing code;
• Utilizing looping constructs;
• Processing script inputs and output of shell commands in a script;
• Processing shell command exit codes.

Domain 3: Operating Running Systems

Here the candidates will be required to demonstrate the capacity to perform the following tasks:

• Manually booting systems into various targets;
• Adjusting the process scheduling;
• Booting, rebooting, and shutting down systems normally;
• Establishing a memory/CPU intensive process and stopping it;
• Managing tuning profiles;
• Preserving the system journals;
• Interrupting boot processes to gain access into a system;
• Starting, checking, and stopping a network services status;
• Transferring files within systems securely.

Domain 4: Configuring Local Storage

Within this domain, the applicants need to be able to perform the tasks, such as:

• Removing and creating physical volumes;
• Creating, deleting, and listing partitions on GPT and MBR disks;
• Creating and deleting logical volumes;
• Allocating physical volumes to volume groups;
• Including new logical volumes and partitions and non-destructively swap to another system;
• Configuring systems to escalate file systems during boot through UUID (universally unique ID) or label.

Domain 5: Creating and Configuring File Systems

This section requires that the learners develop competence in the following areas:

• Creating, using, mounting, and un-mounting ext4, xfs, and vfat file systems;
• Mounting and unmounting the network file systems with NFS;
• Managing layered storage;
• Extending accessible logical volumes;
• Configuring disk compression;
• Developing and configuring set GID directories for the collaboration;
• Diagnosing and rectifying file permission issues.

Domain 6: Deploying, Configuring, and Maintaining Systems

This subject area covers your skills and competence in:

• Scheduling tasks with cron and at;
• Starting and stopping service as well as configuring the service to automatically start at boot;
• Configuring the time service clients;
• Configuring systems to automatically boot into specific targets;
• Modifying system boot-loader;
• Updating and installing software packages from Red Hat Network.

Domain 7: Managing Basic Networking

This topic requires that the students have the abilities to carry out the following technical tasks:

• Configuring IPv4 & IPv6 addresses;
• Configuring the hostname resolution;
• Configuring network services to automatically start at boot;
• Limiting network access with firewall-cmd/firewall.

Domain 8: Managing Users and Groups

The individuals will be required to demonstrate their skills in the following areas:

• Creating, modifying and deleting the local user account;
• Creating, modifying, and deleting group memberships and local groups;
• Configuring super-user access;
• Altering password and regulating password lifecycle for local user accounts.

Domain 9: Managing Security

Within this domain, the examinees should be able to perform the following technical tasks:

• Configuring firewall settings with firewall-cmd/firewalld;
• Creating and utilizing an access control list;
• Configuring key-based authentication for SSH;
• Identifying and listing SELinux file as well as process context;
• Establishing and tackling routine policy violations or SELinux;
• Restoring default file contexts;
• Utilizing Boolean settings to alter SELinux system settings.

Domain 10: Managing Containers

Here one will be measured based on his/her ability to carry out the following duties:

• Locating and recovering container images from remote registry;
• Carrying out container management with commands like skopeo and podma;
• Carrying out fundamental container management, such as starting, running, and stopping;
• Running services inside containers;
• Inspecting the container images;
• Configuring containers to automatically start as the system service;
• Connecting persistent storage to containers.

Red Hat RHCSA and Possible Positions

The professionals with the Red Hat RHCSA certification can launch a career as a Linux System Administrator. With the advanced level of experience, they can land higher positions, such as an Information System Engineer, a Senior Systems Administrator, a Linux Support System Engineer, and a Linux Systems Engineer, among others. The average salary for the certified specialists is $89,736 per annum, according to PayScale.com.

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