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Do you want to work with Linux Enterprise in an MNC? Are you preparing for an interview for the Linux Administrator position? If yes, then you are at the right place. Here, you will read about the Top 20 Red Hat Linux Interview Questions and Answers that can help you learn about a simple way to answer questions in an interview regarding your desired position in an MNC’s job opening. Let’s get started!
Based on Unix, Linux is an open-source operating system renowned for its flexibility, security, and stability. It is extensively utilized in embedded systems, desktops, and servers.
Linux distributions with different software and tools for various purposes are Ubuntu and Fedora.
2. What is Red Hat Enterprise Linux (RHEL)?
A commercial Linux distribution designed for enterprise use is called Red Hat Enterprise Linux (RHEL). It offers a dependable, secure, and highly performant platform for business applications with comprehensive support and certification.
Enterprise environments frequently use RHEL for servers, cloud deployments, and mission-critical workloads.
3. Differentiate between Red Hat Enterprise Linux (RHEL) and a free Linux distribution like Ubuntu.
The following are the variations between the free Linux offered by Ubuntu and Red Hat Enterprise Linux (RHEL):
4. List some key features of Red Hat Enterprise Linux.
Red Hat Enterprise Linux (RHEL) is a recommended option for enterprise environments due to several important features it offers:
5. Briefly explain the role of a system administrator for a Red Hat Linux server.
The hardware and software of a Red Hat Linux server must be installed, configured, and maintained by a system administrator. They oversee user accounts, guarantee system security, carry out routine maintenance, and resolve any problems.
To guarantee effective operation, they also optimize resources and keep an eye on system performance.
6. What is the primary package management tool used in Red Hat Linux?
YUM (Yellowdog Updater, Modified) is the main package management tool used in Red Hat Linux. It manages the installation, updating, and removal of software packages.
YUM has been replaced in more recent iterations by DNF (Dandified YUM), which offers better features and performance. RPM (Red Hat Package Manager) is used by both tools to manage package files.
7. Explain the difference between YUM and RPM.
A low-level tool called RPM (Red Hat Package Manager) is used to install, query, verify, update, and remove individual software packages. A higher-level tool called YUM (Yellowdog Updater, Modified) builds on RPM by automatically managing package repositories and resolving dependencies to make software updates and installations easier.
8. How do you install a new software package using YUM?
Use YUM to install a new software package by issuing the following command:
9. How can you update all installed packages to their latest versions using YUM?
Use YUM to update every installed package to the most recent version by running the following command:
10. How would you remove an unwanted software package using YUM?
With YUM, you can use the following command to get rid of an undesired software package:
Put the name of the package you wish to uninstall in place of ‘package_name.’ The package that is specified as well as any dependencies that were installed especially for it but are no longer required will be removed by this command.
11. How can you create a new user account on a Red Hat Linux system?
On a Red Hat Linux system, run the following command to create a new user account:
Put the desired username for the new account in place of ‘username.’ Once the account has been created, the new user should choose a password using:
You will then be prompted to enter and validate the user’s new password.
12. Explain the process of changing a user’s password on Red Hat Linux.
To modify a user’s password on a Red Hat Linux system, take the following actions:
13. Describe some basic file manipulation commands in Red Hat (e.g., mv, cp, etc.).
Red Hat includes the following basic file manipulation commands:
14. How can you check the uptime of a Red Hat Linux server?
Use the following command to determine a Red Hat Linux server’s uptime:
15. How would you find out how much memory (RAM) is free on a Red Hat system?
To ascertain the available memory (RAM) on a Red Hat system, execute the subsequent command:
This command provides a readable format for the amount of memory that is both free and used.
16. How do you start, stop, or restart a service on a Red Hat server?
Using the systemctl command, you can start, stop, or restart a service on a Red Hat server:
The name of the service you wish to manage should be substituted for service_name.
17. Briefly explain the concept of SELinux in Red Hat and its role in security.
Red Hat Linux’s SELinux (Security-Enhanced Linux) security module imposes required access control rules. It lowers the possibility of unauthorized access and system vulnerabilities by limiting programs’ access to files and resources by establishing policies.
By offering fine-grained control over access permissions, SELinux improves system security as a whole.
18. How can you add a new repository for installing software packages?
Create a new repository file in the directory ‘/etc/yum.repos.d/’ to add a new repository for Red Hat Linux software package installations:
Include the repository’s information in the file, for instance:
After saving the file, close the editor. Installing packages from the new repository is now possible with YUM.
19. Describe a troubleshooting approach for a situation where a service fails to start on Red Hat.
There are a few steps you can take to troubleshoot a service that doesn’t start on a Red Hat (or any other Linux system). This is a methodical way to identify and fix the issue:
To see the service’s current status, use the ‘systemctl’ command. Information about whether the service is failing, dead, or running is provided by this command.
2. View Logs:
Look for any service-related error messages in the system logs. You can view the logs by using ‘journalctl.’
3. Check Configuration Files:
Check to make sure the service’s configuration files are accurate. Check for any misconfigurations or syntax errors.
4. Test Service Manually:
To find out if the service gives you any error messages right away, try starting it manually from the command line.
5. Check for Dependency Issues:
Verify that the service has been installed and is operating for every dependency. To view the dependencies of the service, type’systemctl list-dependencies <service_name>‘.
6. Review Resource Limits:
Resource constraints can occasionally prevent services from starting. Examine the CPU, memory, and disk space among other system resources.
7. SELinux and Firewall Settings:
Verify whether firewall or SELinux settings are preventing the service from starting.
8. Check for Updates:
Make sure the service and your system are up to date. Bugs in previous versions can occasionally lead to the failure of services.
9. Look for Known Issues:
Look through the Red Hat knowledge base or community forums to see if there are any known service-related problems.
10. Restart the Service:
Try restarting the service after making any modifications.
11. Reboot the System:
Rebooting the device might fix problems sometimes.
20. What are some benefits of obtaining a Red Hat certification?
A Red Hat certification has several advantages, such as:
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