10 Effective RedHat Interview Questions
Looking for RedHat Interview Questions? Here are 10 Powerful RedHat Interview Questions for Red Hat Developers.
Red Hat, Inc. is an American multinational software company providing open source software products to the enterprise community. Founded in 1993, Red Hat has its corporate headquarters in Raleigh, North Carolina, with other offices worldwide. It became a subsidiary of IBM on July 9, 2019.
Red Hat has become associated to a large extent with its enterprise operating system Red Hat Enterprise Linux. With the acquisition of open-source enterprise middleware vendor JBoss, Red Hat also offers Red Hat Virtualization (RHV), an enterprise virtualization product. Red Hat provides storage, operating system platforms, middleware, applications, management products, and support, training, and consulting services. Source: Wikipedia
RedHat Interview Questions
Q1. Explain the functionality of Puppet Server?
It is an enterprise application for configuration management toll in Unix like operating systems. It is an open source and automated software used to push the configuration to puppet agents with the help of code. Installing new software, verifying file permissions, updating the user accounts and other tasks can be easily done or performed with help of puppet code.
Q2. Explain the storage cluster?
This is the common Red Hat Interview Questions asked in an interview. A Cluster is defined as two or more computers that combined together to work or to perform tasks. Storage, high availability, load balancing, High performance are the different types of available clusters. Storage cluster is used to provide the consistent view of file systems in all the mentioned servers in a cluster. It helps servers to read and write simultaneously to a single shared file system. It also simplifies the storage administration with help of limiting the installation and patching of applications to a single file system.
Q3. Explain the difference between ulimit and umask?
ulimit is referred to as Linux built-in command that provides the control over the available resources to shell or to started processes. A user can limit to a specific range by editing the limits.conf file and the system settings can be updated in sysctl.conf file. Umask refer to user file creation mask. when file or directory has been created, umask determines permissions of a file for file and directories.
Q4. Explain about SELinux?
SELinux is known as Security- Enhanced Linux. It helps in protecting the server from misconfigurations and compromised daemons. It is used as a security feature and access control implementation for Linux kernel. It is used to put limits and instruct the server programs to access the specific or permission granted files and security policy defines the required action that can be taken.
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Q5. Explain cman and rgmanager in Red hat cluster?
cman is referred to as Cluster manager. It is a distributed cluster manager that runs in each cluster node. It helps in keeping the track of cluster quorum by monitoring the cluster nodes as cman is responsible for monitoring, voting, quorum, heartbeat, and communication between each cluster node.
rgmanager is referred to as Resource group manager.
It manages the collections of cluster resources termed as services, resource trees, and resource groups. It will help red hat administrators to configure, define and monitor cluster services. If any node failure happens, this will try to locate the same clustered service again to another node with minimal service disruption.
Q6.What do you know about DAS?
It is block device from a disk, which is physically attached to host machine. There should be filesystem on it to get it used. Only defined number of servers can access this device. This storage device needs to be near to server storage and the dedicated resources. Sometimes it is not possible to dedicate the hard disk to multiple computers. The solution DAS is easy to configure and less expensive. It includes IDE, SCSI, and SATA technologies.
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Q7. Explain the Load Balancing Cluster?
As the name refers, load balancing cluster used to balance the request load among the cluster nodes when load cluster dispatches the network service requests to multiple cluster nodes. Load balancing cluster provides the cost-effective scalability as a number of nodes can be matched according to load requirements. In load balancing cluster, any node is not working properly, it will check that failure and assign the requests to other available cluster nodes. In load balancing cluster, node failures cannot be visible outside the cluster to clients. Load balancing Add-on helps in doing the load balancing.
Q8. Explain Inodes and its functionality in red hat Linux?
An Inode is defined as the data structure of the file system for Unix like operating systems. It helps in storing all the information about the file but without using its actual name and data on Linux and other Unix like operating systems. The inode number is assigned which is unique within the file system when a file has been created and a name is also provided to file.
The name and inode number are stored in directories as entries for the user who contain these files. It mainly helps in recovering the damaged file system for the user. If any inode is lost, it will appear in lost + found directory. This is the most frequently asked Red Hat Interview Questions in an interview.
Q9. Explain NAS and SAN?
NAS is a device which mainly runs the embedded operating system on simplified hardware like monitor or keyboard. It is used to authenticate clients and also provides sharing to the other computers or users to a network that requires dedicated IP to get it accessible. Automatic or manual backups can be set with help of software program that can be even used copy the files between NAS and all other connected devices. It allows user permissions, folder privileges, restricted access to documents etc.
SAN is block-level storage solution. It is mainly optimized for a high volume of block-level data transfer. It is highly scalable, in terms of capacity and performance. It provides the solution for storage and multiple access to files simultaneously like streaming audio, video, cloud computing etc. It is an architecture to attach remote storage and appear like it is locally attached.
Q10.What are suid and sgid terms?
- Suid provides the same permissions as the owner of a file is having when the file is executed by the user.
- Sgid inherits the group privileges of the file on execution. It inherits the group ownership of directories when a file is created within the directory.