DevOps :: DevSecOps

Q.What is Kernel? Explain the task it performs.  Ans: Kernel is used in UNIX like systems and is considered to be the heart of the operating system. It is responsible for communication between hardware and software components. It is primarily used for managing the systems resources as well. Kernel Activities: The Kernel task manager allows tasks to run concurrently. Managing the computer resources: Kernel allows the other programs to run and use the resources.Resources include i/o devices, CPU, memory. Kernel is responsible for Process management. It allows multiple processes to run simultaneously allowing user to multitask. Kernel has an access to the systems memory and allows the processes to access the memory when required. Processes may also need to access the devices attached to the system. Kernel assists the processes in doing so.For the processes to access and make use of these services, system calls are used. Q. Different types of Kernel. Ans . Monolit...

Q. What is BIND? What are the key  Components of DNS ? Ans: BIND stands for Berkeley Internet Name Domain which is the most commonly used Domain Name System (DNS) server on the Internet. a) Domain Name space   :- Provide s structure of DNS distributed space.Domain name space  has hierarchical structure.The root domain is at the TOP.Below the root domain the TOP or First level domain. e.g...com,edu,biz..      Second Level Domains are registered to individual domains,such hp.com,Google.com. Second level domain have many sub domains and any domain can have host.A host is a specific computer with in a domain Such webserver1.it.hp.com ,computer.it.hp.com  .etc FQDN parts for webserver1.it.hp.com   is as described below.  webserver1 -->   host     it. --> sub domain hp. --> 2nd level domain         ...

What is NFS? NFS stands for Network File System. NFS was originally developed by Sun Microsystems in the 1980's. NFS allows remote hosts to mount file systems over a network and interact with those file systems as though they are mounted locally. This enables system administrators to consolidate resources onto centralized servers on the network. Which NFS versions are available? NFS Version 2 NFS Version 3 NFS Version 4 What is different between NFS Version 2 & 3 ? NFS 2 default 8kb transfer rate, it did not check the authentication at the time connection. Client wants to access unauthorized file it shows error messages like "write error","read error" nfs 3 32kb transfer rate. It check at the time connection- ACL Support What is the role of "all_squash" option? Treat all client users as anonymous users. Map all user and group IDs to the anonymous user and group ID. What is the role of "root_squash" option? All requ...