Wednesday, August 11, 2010

Linux Interview Questions: Experienced

1)How to implement Squid proxy?
2)How to see bandwidth used by ftp user?
3)ow to implement Squid as reverse proxy?
4)How to see logs of Squid proxy?
5)How to see cache in Squid proxy?
6)How to clear Cache in Squid proxy?
7)Totally how many configuration modules are there in Squid proxy?
A)nearly some 127 modules in squid proxy
8)What is the authentication used in Samba when it is used as PDC?
9)Where is the logs present for samba PDC server?
10)Some of the logs in my system are not time stamped how to resolve this ?
11)How to see what is the encryption used by ssl?
11)How to host different domains on with different ip add on single system?
12)How to assigned different ip add to single interface?
13)How to assign different ip addresses to single interface? what is the default gateway to each ip address?

what is DNS?
why we required CHROOT package? can you explain it?
What is the location for DHCP server default leased configs file?
what is the command and syntax to check DNS server named.conf file errors?
What is the command and syntax to check DNS server zone files config errors?
How do you update DNS zone file entries with out restarting named demon?
What are the services/demons will restart when you restart NFS service?
how do you update NFS sharing details with out restarting NFS server?
What are the advantages of NIS?
Can you explain me about LVM and how you configure LVM?
What is the difference between LVM1 and LVM2?
What is Amanda server and where is it used?
Can you explain me corntab?
How to resize LVM?
Can you explain me about RAID5?
How many RAID devices are there in RHEL5 by default?
Min how many Raid devices will participate in RAID5?
How do you do Kernel patching and what is the command?
Can you explain me about in details how you do kernel recompilation?
Can you explain what is the use fo access file in sendmail and what is its location?
Can you explain me what is the advantage of local-hosts file and virtusertable in sendmail?
How you will specify static IP's in DHCP server?
how do you update NIS users with out restarting the NIS server?
What is the partation no for LVM?
What is the partation no for RAID?
What is the port no for DNS?
Can we change default port no for DNS? if yes, how?
How many RAID device we can create in RHEL4?
Can you explain me Disk quota in detail and configuration details?
How to increase RAID devices after it excied max limit?

1)What is the difference between Xen and VMware?
A)XEN : Xen is an open-source virtualization solution. The Xen hypervisor acts as a thin layer between the hardware and the operating system, allowing multiple virtual servers to run simultaneously on a single physical server. Each virtual server acts independently of the others, with its own allocated area of RAM and virtual disks.
VMware : VMware is a company that provides virtualization software for x86-compatible computers.

2)Can we install HPUX( (Hewlett Packard UniX) on Vmware?
A)No. Because HPUX can be installed only on PA-RISC or Itanium and Vmware can not emulate this hardware.
3)How to use SAMBA as PDC(Primary Domain Controller)?
4)What is IPchains?
A)Ipchains is a utility for Linux that System Administrators can use to create and modify the ruleset that is used for their host based firewall. These rules are used by a system to decide whether or not it is going to allow a specific remote connection.
5)What is the difference between IPchains and IPtables?
IPchains : Ipchains is a utility for Linux that System Administrators can use to create and modify the ruleset that is used for their host based firewall. These rules are used by a system to decide whether or not it is going to allow a specific remote connection.
IP tables : Iptables is a generic table structure that defines rules and commands as part of the netfilter framework that facilitates Network Address Translation (NAT), packet filtering, and packet mangling in the Linux 2.4 and later operating systems.
6)Explain me how we can use parted command to create partitions ?
7)What is hard NFS(Network File System)? mount and soft NFS mount?
8)Explain briefly about Linux Booting process?
9)What is the difference between TCPdump and Nmap?
10)How to create EXT3 and EXT2 file system?
11)What is the difference between ext2,ext3 and ext4?
12)How to extend LV(Louis Vuitton)?
13)How to see how many VG's are there?
14)Explain the process of configure Apache.
15)How many types of chains are there in IPtables and what are they explain each?
16)What is super block?
17)What is INODE limit? If the file system reaches that limits how to resolve that?
A)Inode is a unique number given to a file in Unix OS. Every file in Unix has a inode number. unix treats directories/folders as a file so they are also having a inode value.
18)What are ACL's in Linux how to implement it in Linux?
19)How to take backup to Tape-drives?
20)How to rectify if tape drive file(hardware file) is missing?
21)What is the difference between RAID01 and RAID10?
22)When using RAID in which cases will you use RAID1 and which cases you will use RAID5?
23)How to implement password less SSH logins?
24)How a user can change a password?
25)How can you get info that my last command executed properly?