linux

Interview Questions and Answers

Linux

Question:
What's the difference between Agents and Resources?
Answer:

Agents are VCS processes that control and monitor the Resources. Resources are all those objects in your Service Group, and they all require Agents

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Linux - Questions
1. Describe Linux boot-up sequence
Answer
2. What is an INODE?
Answer
3. How do you list and flush all IPtables?
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4. How do you list compiled-in Apache modules?
Answer
5. How do check the status of VERITAS Cluster Server ?
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6. Which command you will use to check the syntax of the main.cf ?
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7. How will you check the status of individual resources of VCS cluster?
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8. What is the use of halink command ?
Answer
9. What is the difference between switchover and failover ?
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10. command to Verifying that links are active for LLT
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11. how to Change configuration to read/write mode
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12. command to check vcs licence
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13. command to list the list the parameters of a resource
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14. Which file needs to update if srequired to change default runlevel 5 to 3
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15. How can we increase disk read performance in single command
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16. .... command to change user password expiration time
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17. Command used to lock user password
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18. How many default number of Shells available and what are their names?
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19. ...... command used for changing authentication of linux system to LDAP/NIS/SMB/KERBOS
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20. How can we change speed and make full duplex settings for eth0
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21. File which stores the DNS configuration at client side
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22. Restricting insertion into file if full permission are assigned to all
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23. Kill any user's all processes
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24. Default Port numbers used by ssh,ftp,http,https,telnet,smtp,pop3,pop3s,imap,imaps
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25. How to make USB bootable?
Answer
26. How can we check disk/device status/failure/errors using smartctl utility?
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27. What is SYN Flood, ICMP Flood
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28. What is the difference between Unix vs Linux Kernels?
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29. Command to see default kernel image file
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30. How to create lvm mirror
Answer
31. what is the requirement of udev daemon?
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32. What are block and character devices?
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33. File required to modify for setting up kernel parameters permanent
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34. What is tmpfs File System
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35. How can we check vendor, version, release date, size, package information etc... of any installed rpm?
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36. What is an MX record?
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37. How do you search for a pattern and than replace it in an entire file?
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38. Which is the main config file for VCS and where it is located?
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39. What is the service group in VCS ?
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40. What is the use of hagrp command ?
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41. How to switchover the service group in VCS ?
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42. How to online the service groups in VCS ?
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43. What is jeopardy in vcs
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44. What is split brain in vcs
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45. Cluster Log File location
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46. How can I shutdown VCS without shutting down my applications?
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47. what is freeze in vcs
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48. Can I run different versions of VCS in the same cluster?
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49. Difference in critical and non-critical resource
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50. Command to clear the faulty resource
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