Interview Questions - Part II

1. Booting procedure of linux?

2. What is initrd image?
3. what is the last file executed during the boot process.
4. How to restrict login to a server for maintanence
6. What is NIS. What are the configuration files both server and client
7. NIS database format?
8. What all can be shared using NIS.
9. What is consept of NIS mater and slave.
10. WHich all way an NIS slave server get the database get updated?
11. Daemons/services used for NIS.
12. Whatis NFS.What are the configuration files?
13. How to enable client side root access to NFS shares?
14. Daemons/Services required for NFS.
15. Ports used by portmap.
16. port used by NFS.
17. If you accidently removed the password file how can you restore it. (Not)
18. If the system is not booting after grub is loded . How you are going troubleshoot?
19. What all the resource records of DNS?
20 what is the port used by DNS
21 What is primary and secondary DNS server?
22. Is it possible to register the DNS server only with primary DNS server
23. What is the client side configuration file for DNS
24. What is maxium number of DNS server entries at client side.
25. What is automount?
26. what all the daemons required for automount
27. what is the purpose of using automount.
28. How do you change the kernal parameters.
28. how to see the current kernal parameters.
29. How to make the modules automaticall y loded on boot.
30. What are the different types of kernals in linux.
31. Kernal comilation procedure.
32. How mail works in general.
29. What is the port for SMTP.
30. What is the pot for POP3
31. What is IMAP?
32. what is MTA.
33. wHAT IS ssh?
34. How ssh is secured.
35. Is it possible to have passwordless login usign SSH.
36. What is the difference between telnet and ssh.
37. What is the difference between xinetd and init.d services?
38. What is the core process in linux OS?
39. What is difference between hardlink and soft link in linux.
40. What is umask and what is the default umask for root user and normal user.
41. Where can be set the system wide environment variables?
42. Where can be set the user level environment variables.
43. If we need to execute a script when ever a user login where to place that script ?
44. How to load a module in to the running kernal
45. How to unload a module from the running kernal.
46. How to compile new modules in to a kernal.
47. how to list the listening ports on a linux ox
48. How to list only a particular user process.
49. How to list all the processes ina linux box.
50. How to list all the iopen files in a linux box.
52. What is cpio?
53. how to list the most space used files and directories.
54. How to delete all the files older than 10 days from a directory tree
55. What all the different fields of a crontab file.
56. NFS options
57. How to boot in to single user mode.
58. What are the difference run levels in linux.
59. where is the default runlevel is mentioned?
60. If yousee the memory usage os 100% what all the step you will take to make the server stable. Reboot is not possible.
61. Is it possible to reduce the size of a logical volume.?
61 how to increase the size of a logical volume/volumegroup.
63. What are the differenttype of the devices in linux.
64. How to create raw devices in linix.
65. If you see a log files is grown up to some GB and you want to free up some space. You are not supposed to stop the application. How do you do it?
66. What are the different kill signlas.
67. What kill -HUP does?
68. What is the default port for apache?. How to change the default port?
69. What are the different types of virtual servers in apache. and difference.
70. What it the reverse proxy in apache?. and where it can be useful.?
71. Are you familer with module in apache?
72. What is the use of rewringing modules.
73. what is the ports for http?. Is it possible to use another port?.
74. If we use another port for http how it can be accesed from a web browser with out putting the port in the URL.
75. How to see the speed of a NIC?
76. What is duplex of NIC? and what is difference between half duples and full duplex?
77. How to change the duplex settings of an NIC?
78. What you mean by auto negotiation of an NIC?.
79. How to see the performance of of a linux box?
80. How to see the disk performance of a linux box?.
81. How to see the network traffic on a linux box?.
82. What is SNMP?.
83. Ports used by SNMP?.
84. How to see the file system usage?.
85. What happened if /tmp is full on a mail server?.
86. what happened of /var is full on a mail server?.
87. If you have 100 systems to install. How you are going to do it?.
88. What you mean by TCP wrapper. What all the files used in this?
89. If you find your system is targeted for a bruteforce attack how you are going to prevent it?
90. WHat is GFS?
91. What is the latest version of GFS?
92. What is the difference between gfs and gfs2.
93. Command for creating GFS files syste, gfs_mkfs(gfs.mkfs for gfs2) -p lock_dlm(gulm) -t clusterName:FSname -j Number of Journal
94. For a 5 node cluster the the number of journal required for a GFs?
95. List the cluster specific Daemons.
96. What is ccsd ?
97. What is CMAN?.
98. What is the service required for GFS+LVM?
99. What is fenced
100. How do you see the status of cluster services.
101. How do you manage cluster services (relocationg and starting and stoping)
102. Steps to create a cluster services.(HTTPD)
104. Does the GFS files system required to be put it in /etv/fstab? Why?.
105. What is OOM?.
106. What is the immediate fix for the OOMM killing process?
107. What is the permanent fix for OOM killing process?.
108. The most destructive commands in linux?.
109. How do you make root mails to forward to your email address [Update /etc/alaises with mail address root: email]
110. How to update /etc/aliases


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