Redhat Interview Questions for Freshers/RedHat Interview Questions and Answers for Freshers & Experienced

What is the total number of primary partitions you can have on one drive in Linux Red Hat?

What is the total number of primary partitions you can have on one drive in Linux Red Hat?There have only four primary partitions, with no extended partition, on one drive in Linux Red Hat. If more than four partitions needed, there have three primary partitions, one extended partition, and multiple logical partitions within the extended.

Can you elaborate on the process states in Unix?

In Unix, the processes execute the changes states considering the ongoing circumstances. However, the states in Unix are:

>> Waiting: It suggests the process is waiting for the resources or an event.

>> Running: Here, the process is in running states, or it may suggest the process is all set to work.

>> Stopped: The Unix process has been stopped. They stop functioning after getting a signal.

>> Zombie: It suggests, the Unix process is dead. However, it is still there in the process table.

How will you create a partition of 100MB and mount it?

* Use the command “partprobe” and then mkfs -t ext3 /dev/hda?
* First, to create a new partition, the users need to use fdisk /dev/had.
* Now, for the new partition, type “n.”
* Then, the users need to select between primary or logical partition. There, press “1” to go for a logical partition.
* It will then ask to choose the starting cylinder type. Keep it default by pressing “Enter.”
* Now, the users need to put the size. Put +100M then press “P” for verification of the partition list and name.
* To write the partition on the partitions table, press “W.”

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

One can use SSH, reliable remote desktop software that can help the users to control the Red Hat server remotely. It can be controlled through certain commands. Besides, SSH also effectively encrypts the data. This software uses port 22.

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

In Red Hat Linux, parted is a popular command, or you can say a tool that lets the users manage the hard disk partitions easily. This can help you in deleting, adding, extending, and shrinking hard disk partitions and file systems. However, with time it has gone through several changes. Some of its old features are now replaced with new ones.

Can you tell me about the bootloader? Give us a short description.

One of the easiest Red Hat Linux System Administrator interview questions in the interview. The answer is very simple. Just tell the recruiter that bootloader boots the operating system. Besides, it takes the decision about the kernel from which the operating system will boot.

Elaborate about sgid and suid terms?

Talking about suid, it offers the same level of ownership permissions while a user executes a file. Coming to the sgid, it comes with a group of privileges of a completed file. It inherits the ownerships while developing the directory.

Tell us about SAN and NAS?

In Red Hat Linux, NAS runs an embedded OS on the basic hardware, for example, keyboard and monitor. Its primary purpose is to verify the clients and offer to share with the multiple systems or users to a particular network that needs dedicated IP to work. On the other side, SAN is a perfect storage solution at the block-level. It is primarily developed to handle high volume data transfer. In terms of performance and capacity, this is perfectly scalable.

Tell us about SAN and NAS?

In Red Hat Linux, NAS runs an embedded OS on the basic hardware, for example, keyboard and monitor. Its primary purpose is to verify the clients and offer to share with the multiple systems or users to a particular network that needs dedicated IP to work. On the other side, SAN is a perfect storage solution at the block-level. It is primarily developed to handle high volume data transfer. In terms of performance and capacity, this is perfectly scalable.

Clearly explain the Indoes and their uses in Red Hat Linux?

It refers to a data structure of a file system found in Unix like OS. It stores all the necessary information about the file. However, it doesn’t use the actual name. The inode helps in the process of recovering the files systems, which are damages. If there is any lost inode, you can locate it in “locate + found” directory. Remember that this question comes under the most frequently asked Red Hat Linux System Administrator interview questions. So, keep the answer in your mind.

What do you mean by LVM?

In Red Hat Linux, LVM refers to Logical Volume Mangere. It is the storage management solution that lets the Red Hat Linux System Administrators split the space of hard drive into PV- Physical Volumes. After that, PV is combined into VG- Volume Groups. The VG can be further divided into LV- Logical Volumes.

Tell me about the load balancing cluster?

As the name suggests, the load balancing cluster utilized to balance the load throughout the cluster nodes. It works when the cluster dispatches the service request to a different cluster node. This cluster offers inexpensive scalability as multiple nodes can be configured considering the load requirements. In this cluster, if a node is not working correctly, it will then detect the failure and then assign required requests to available nodes. Here the collapse of the node will not be visible outside the cluster.

Can you explain DAS?

This is one of the common Red Hat Linux System Administrator interview questions that every employer asks. However, the answer is quite simple. It is, generally, a block device physically connected to the host machine. It comes with a filesystem. Only certain servers can access the device. You can find such storage devices, near-dedicated resources, and server storage. The DAS is inexpensive and easy to use. It covers SATA and SCSI technologies.

Explain the runs levels and how to alter them?

In Linux, a run level is a stage of initialization that effectively defines what types of system services are functioning. They are generally defined by numbers. In general, there are a total of 7 run levels in the Linux system, and they serve a different purpose. They are:

* Halt system (Sued to turn off the system)
* Basis multi-user mode but there will be no NFS
* Single users mode
* Full multi-user mode (based on the text)
* Multi-user mode (graphical UI)
* Unused
* Reboot system

Now talking about the process for changing the level, one needs to change the file – /etc/inittab. Alter the initdefault entry (id:5: initdefault:). If the users want to alter the run level on the fly, they can do it through the ‘init’ command. Let’s take an example.

When a user types Init 3 in the command line, this will shift the system to run level 3 from run level. To list the current level, the users can use the command “Who -r.”

Explain about rgmanager and CMA?

This is one of the most complex Red Hat Linux System Administrator interview questions. So, while answering it, remember to tell transparently. In the Red Hat cluster, Cman works as a cluster manager, especially a distributed cluster manager. It operates in a cluster node. Talking about its functions, it effectively tacks the cluster quorum by observing the cluster nodes. Cman is responsible for a quorum, voting, communication, and monitoring between clusters.

Coming to the rgmanager, it is a resource group manager. Rgmanager is responsible for collecting cluster resources defined as resource trees, resource groups, and services. This dramatically helps a Red Hat administrator to define, monitor, and configure the cluster services. When a node fails to work, it will locate that particular clustered service to other nodes without affecting the services.

Is Redhat Linux is free or paid?

Linux is an open-source Operating System that can be available free of cost.

While installing Apache, what is the web port used to serve web pages?

Well, most of the web servers operate on Port 80. So, while installing Apache, it automatically defaults to Port 80. However, users can use some alternative ports. But this will force them to type a port into a browser to get access to the website. You can also use Port 8080 for this.

Elaborate about SELinux?

Talking about SELinux, it is a Linux program with enhanced security features. SELinux keeps the server protected from compromise and misconfiguration. This is sued to access the control implementation for the Linux Kernel. It puts a limit and then instructs the servers to only access the particular files and security policies.

Can you explain the difference between umask and ulimit?

In general, ulimit is a Linux built-in command which offers excellent control over available resources to start the process. The users, if want, can limit the range by customizing the limits.conf files. Besides, the users can update the system settings by editing the sysctl.conf file. Now talking about umask, it defines the use file creation mask. When the users create a directory and file, umask sets the permission for the directories and files.

Explain in short about the storage cluster?

This is one of the most commonly asked Red Hat Linux System Administrator interview questions that you will face during your job interview. Talking about the cluster, here multiple computers combined together to carry out some tasks. Some major types of clusters are high performance, load balancing, high availability, and storage.

The storage cluster helps in providing the perfect view of the file system in the servers in the group. It dramatically improves the servers to write and read at the same time to a shared file system. Besides, storage simplifies the storage administration by effectively limiting the patching and application installation process.

What is the command to install Rpm packages?

To install Rpm packages in CentOS and Red Hat, you can use yum and rpm command lines.

How to know what the version of the Red Hat is?

For this, the users can use the command “cat /etc/Redhat-release.” You will get the output that will show the version.

Can you explain the functionality of a Puppet Server?

Yes. In general, this is an enterprise application and perfect for configuration management. A puppet server is for Unix like OS. Explaining in detail, this a completely open-source and fully automated program. Using this, one can send the configurations to puppet agents through codes. Some essential tasks such as updating user accounts, verifying permissions of the file, new software installation, and others and can be carried out using the puppet code.

Can you explain the objectives of Red Hat Linux?

The users who know everything about Red Hat Linux can use the Red Hat Enterprise Linux for customization of the operating environment. Besides, it also helps in completing some basic command-line tasks as well as productivity roles related to the desktop.

How can a user rename a file in Red Hat Linux?

To rename the file, you need first to open the shell command line of Red Hat Linux. There you need to use the “mv command.” Then the command will take to the original file and the newly named file. You need to check the parameters before renaming the files. However, if you forget to mention the parameters, then the command will notify you to put those.

How can one change the user password?

The users to change the password, can use the command “passwd.” While executing the command through the terminal, the users need to put the current password. After that, put the new password. The process is quite easy.

What do you mean by Red Hat Network?

Red Hat Network is a platform, especially a system management platform which provides the users with effective lifecycle management of different applications and operating system. It helps in:

* Installing as well as provision new Linux systems.
* Configuration file management.
* Updating systems.
* Performance monitoring.
* Redeploying the systems for satellite and hosted deployment architectures.

How to verify the uptime of a Linux server?

For this, you can use the uptime command. It can show you the duration of how long the Linux box is running. Besides, w and top command can verify the uptime.

What do you mean by Red Hat Enterprise Linux?

This is one type of Linux/ GNU distribution developed by Red Hat, a multinational open-source software provider.

What do you mean by Linux?

Linux s one of the most widely used operating systems, developed based on Linux Kernel. As this is an open-source OS and can use on various hardware platforms. Those who are looking for low-cost and free OS, then this one is the best. It comes with a user-friendly interface, and users can customize the source code as per their requirements.

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