RHCE Interview Questions and Answers

The demand for qualified systems administrators is on the rise, particularly among those who hold a Linux certification. Aside from that, an administration's average annual compensation might reach USD 82,000. As a result, now is the optimal time for you to enter this field.

To get a job, you must have a thorough understanding of Red Hat Linux System Administration. Do you intend to change careers? Are you getting ready for your next Red Hat Linux System Administration position? If this is the case, don't be concerned. Our Mindmajix team has compiled a list of the Top 30 Red Hat Interview Questions and Answers to assist you in passing the (RHCE) Red Hat Certificate Exam and the Red Hat Linux Administrator Interview.

We have categorized RHCE Interview Questions - 2024 (Updated) into 2 levels they are:

• For Freshers
• For Experienced

Frequently Asked RHCE Interview Questions

1. How to verify the uptime of a Linux Server?
2. Explain about the Red Hat Network?
3. Explain the objectives of RedHat Linux?
4. Explain the functionality of a puppet server?
5. Explain the difference between umask and ulimit?
6. Explain the run levels and how to alter them?
7. Explain about LVM in RedHat Cluster?
8. Tell us about DAS in RedHat Cluster?
9. Explain the Indoes and their uses in RedHat Linux?
10. What is meant by Crontab and explain its fields in Crontab?

RHCE Interview Questions and Answers for Freshers

1. What is meant by Linux Server?

Linux, based on the Linux Kernel, is one of the most extensively used operating systems. Because this is an open-source operating system, it can be used on a variety of hardware platforms. This is the finest OS for those looking for a low-cost and free operating system. It has a user-friendly interface and allows users to alter the source code to their needs.

2. What is meant by Red Hat?

Red Hat is a Linux operating system distribution aimed towards the commercial market. Red Hat Linux Advanced Server was the previous name for RHEL.

If you want to enrich your career and become a professional in Red Hat, then enroll in "RHCE Training". This course will help you to achieve excellence in this domain.

3. How to verify the uptime of a Linux Server?

Use the uptime command to find out how long it has been since you last checked. It can display to you how long the Linux box has been running. In addition, the w and top commands can be used to check the uptime.

4. Explain about the Red Hat Network?

Red Hat Network is a network, particularly a system management platform, that allows users to manage the lifespan of various applications and operating systems effectively. It helps in: 

• New Linux systems are installed and provisioned.
• Management of configuration files.
• System updates.
• Monitoring of performance.
• The systems are being re-deployed for satellite and hosted deployment architectures.

5. How to change the User Password?

The command "passwd" can be used by users to change their password. The current password must be entered while running the command through the prompt. Then type the new password. It's a simple procedure.

6. How to rename a file in RedHat Linux?

To rename the file, you must first open the Red Hat Linux shell command line. You'll need to utilize the "mv command" there. The program will then navigate to both the original and freshly named files. Before renaming the files, double-check the parameters. If you neglect to specify the parameters, though, the command will prompt you to do so.

7. Explain the objectives of RedHat Linux?

Red Hat Enterprise Linux can be used to customize the operating environment by users who are familiar with Red Hat Linux. Furthermore, it aids in the completion of some basic command-line chores as well as desktop productivity duties.

8. Explain the functionality of a puppet server?

In general, this is a business application that is ideal for managing configurations. A puppet server is a server that runs on a Unix-like operating system. To be more specific, this is an entirely open-source and fully automated application. This allows you to send specifications to puppet agents using codes. Puppet code can be used to perform operations such as upgrading user accounts, validating file permissions, and installing new software, among others.

9. What is meant by Storage Cluster?

When we talk about a cluster, we're talking about a group of computers that work together to do certain tasks. High performance, load balancing, high availability, and storage are all examples of clusters.

The storage cluster aids in delivering the best possible picture of the file system in the group's servers. It substantially enhances the servers' ability to write and read to a shared file system at the same time. Furthermore, storage administration is made easier by effectively restricting the patching and program installation processes.

10. Explain the difference between umask and ulimit?

The ulimit is a built-in tool in Linux that provides excellent control over the resources available to begin the process. Users can customize the limits of the conf files to limit the range if they desire. Users can also change the sysctl.conf file to update the system settings. Umask, on the other hand, defines the use of a file creation mask. When a user creates a directory or a file, umask assigns permissions to those directories and files.

11. Explain about SELinux?

Security-Enhanced Linux is sometimes known as SELinux. It aids in the protection of the server against misconfigurations and hacked daemons. The Linux kernel uses it as a security feature and access control mechanism. It's used to set boundaries and tell server applications how to access certain or permission-granted files, and security policy outlines the actions that must be followed.

12. What is a web port used to server web pages while installing Apache?

Port 80 is used by the majority of web servers. As a result, when you install Apache, it defaults to Port 80. Users can, however, use some alternate ports. However, they will be forced to type a port into a browser to access the website. Port 8080 can also be used for this.

13. Explain the run levels and how to alter them?

A run level is a stage of setup in Linux that effectively defines which types of system services are available. Numbers are used to define them in particular. In the Linux system, there are a total of seven-run levels, each of which serves a particular purpose. They are as follows:

• System of halt (Sued to turn off the system)
• Although there will be a multi-user option, there will be no NFS.
• Mode for single users
• Multi-user mode in its entirety (based on the text)
• Mode for many users (graphical UI)
• Unused
• Restart the computer.

When it comes to modifying the level, one must edit the file /etc/inittab. Make a change to the initdefault section (id:5: initdefault:). If users want to change the run tier on the fly, they can use the 'init' command. Let's have a look at an example.

When a user inputs Init 3 into the command line, the system is switched from run level to run level 3. The command "Who -r" can be used to display the current level.

14. Explain about rgmanager and CMA in RedHat Cluster?

Cman is a cluster manager, specifically a distributed cluster manager, in the Red Hat cluster. It works as part of a cluster node. It efficiently tracks the cluster quorum by observing the cluster nodes, according to their functions. Cman is in charge of quorums, voting, communication, and cluster monitoring.

It is a resource group manager who is in charge of the manager. The rgmanager program is in charge of gathering cluster resources such as resource trees, resource groups, and services. This greatly facilitates the definition, monitoring, and configuration of cluster services for a Red Hat administrator. When a node fails, the clustered service will be relocated to other nodes without disrupting the services.

15. Explain about Load Balancing Cluster in RedHat?

The load balancing cluster does exactly what its name implies: it balances the load across the cluster nodes. Whenever the cluster sends the customer request to an alternative cluster node, it works. Because numerous nodes can be designed to meet the load needs, this cluster enables low-cost scalability. If a node in this cluster fails, the cluster will notice the outage and assign the appropriate requests to other nodes. The node's collapse will not be seen from anywhere in the cluster in this case.

16. Explain about LVM in RedHat Cluster?

LVM stands for Logical Volume Manager in Red Hat Linux. It's a storage management method that enables Red Hat Linux System Administrators to divide a hard drive's capacity into PVs, or Physical Volumes. PV is then divided into VGs, or Volume Groups. The VG is further broken down into LVs, or Logical Volumes.

RHCE Interview Questions and Answers for Experienced

17. Explain the process for creating LVM in RedHat Cluster?

Users must first construct actual volumes. They can do this by running the command "pvcreate /dev/sda2" (#pvcreate /dev/sda2). They must then add the actual volume towards the volume cluster when it has been established. The command "vgcreate VLG0 /dev/sda2" could be used here (#vgcreate VLG0 /dev/sda2). Create an appropriate volume from the volume cluster now. #lvcreate -L 1G -n LVM1 VLG0 (#lvcreate -L 1G -n LVM1 VLG0) Users must use the "mke2f" command to create a file system on Sda2 in the last phase (#mke2fs -j /dev/VLG0/LVM1).

18. Tell us about DAS in RedHat Cluster?

It's usually a block device that's physically attached to the host computer. It includes a filesystem. The gadget can only be accessed by specified servers. Storage devices, server storage, and near-dedicated resources are examples. The DAS is a low-cost, simple-to-use device. It covers the technologies of SATA and SCSI.

19. Explain about SAN and NAS?

Ans: NAS runs a Red Hat Linux embedded OS on the fundamental hardware, such as the monitor and keyboard. Its main objective is to validate users and offer to share IP addresses with numerous systems or users on a network that requires a dedicated IP address to function. On the other hand, at the block level, SAN is an ideal storage solution. It was created primarily to manage large amounts of data transfer. This is scalable in terms of reliability and capacity.

20. Explain the Indoes and their uses in RedHat Linux?

For Unix-like operating systems, an inode is the data structure of the file system. On Linux and other Unix-like operating systems, it assists in storing all of the data about a directory instead of using the file's actual name or data. When a file is created, the inode number is assigned, which is unique within the file system, and the file is also given a name. The user's name and inode number are saved as entries in directories that contain these files. It primarily aids the user in recovering a corrupted file system. If an inode is missing, it will display in the directory lost + found.

21. Give us a short description about bootloaders?

The bootloader is responsible for starting the operating system. It also chooses the kernel where the operating system will start.

22. Elaborate the terms suid and sgid?

When it comes to suid, it provides the same kind of administrative permissions to a user when they execute a file. When it comes to the sgid, it provides a set of finished file privileges. While creating the directory, it inherits the shareholdings.

23. How will you create a partition of 100mb and mount it in RedHat Linux?

Following are the steps to create the partition of 100MB and mount it:

• Use "partprobe" first, then mkfs -t ext3 /dev/hda.
• Users must first use fdisk /dev/had to make a new partition.
• Now type "n" to create a new partition.
• The users must then choose between primary and logical partitions. To create a logical split, hit "1" there.
• It will then prompt you to select the type of starting cylinder. By pressing "Enter," you can keep it at its default setting.
• The users must now enter the size. Press "P" to verify the partition list and name after entering +100M.
• Press "W" to write the partition to the partitions table.

24. What kind of remote software users can use to encrypt the communication?

SSH, a dependable remote desktop platform that enables users to manage the Red Hat server remotely, can be used. Certain commands can be used to control it. Furthermore, SSH encrypts the data effectively. Port 22 is used by this program.

25. What is meant by Crontab and explain its fields in Crontab?

The cron program in the Red Hat Linux platform runs commands at certain times and dates. As a result, this considerably aids in the scheduling of activities and is particularly effective for recurrent tasks. Crontab simplifies the process of deleting and reinstalling the tables that power the cron. Here are some Crontab command lines.

Crontab -r-- this command helps to remove your crontab file.

Crontab -e -- this command helps to edit your crontab file. 

Crontab -l -- this command helps to show your crontab file.

26. Do you know what “parted command” If yes, then tell why it is used?

Parted is a prominent command, or tool, in Red Hat Linux that allows users to conveniently manage hard disk partitions. You can use this to create, delete, add, extend, and reduce hard disk partitions and file systems. It has, nevertheless, undergone various alterations over time. New features have taken the place of some of the previous ones.

27. When Checking The Partition Information On Your Hard Drive With Fdisk, You Notice That One Of The Partitions Is Formatted As "Linux Swap" And Is Approximately 512MB In Size. What Is The Purpose Of This Partition?

The Linux swap drive is used as virtual memory to process information that is too large to fit in the present memory. Information can be stored on a disk and recovered quickly using this swap file. High use of the virtual disk suggests a memory problem.

28. What Sort Of Kernel Error Can Cause A Linux System To Crash And Write A Memory Core Dump?

A Linux system can crash due to a kernel panic error. When a kernel panic occurs, it means that a kernel process has failed. This is a critical error that will bring the entire Linux system to a halt. These core dumping should be thoroughly examined to determine the source of the problem.

29. A Developer With the Username Sanjay Has Told You That One Or His Processes Seem To Be Locked Up And He Cannot Do It. He Reported That It was A Bug In His Code And May Quickly Use Up All Cpu And Ram Resources On The Server. How Will You Tack The Process And Terminate It?

The first challenge is to specify the process, which you may do with the ps command #. Sanjay ps -au

Now use the top command to examine the processes that are currently executing and see which one is consuming the most resources. You can use the terminal command to end a troublesome process once you've discovered it. Because the user was unable to terminate the process, you should most likely provide a kill signal to ensure that it terminates:

#kills -9 [process PID]

Execute the ps command on the user again to make sure it's stopped:

Sanjay ps -au

30. Name Any Four General Password Rules For User Account?

Following are the four general password rules for user accounts:

• Incorporate at least eight characters in total.
• Should use a string in a non-repetitive manner.
• Use words that can be found in a dictionary sparingly.
• Use special dates like birthdays and anniversaries sparingly.

Conclusion

These Red Hat Interview Questions and Answers give you insights into various types of questions that might be asked in your Red Hat Linux System administrator job interview. I hope these RHCE interview questions and answers will help you ace the job interview and clear the certification exam.

After attending the interview, if you found any other questions asked other than this in the blog, feel free to post them in the comment section below and our experts will include them in the blog along with the best possible solution to help other learners learn from your experience.