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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
