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Udemy - Linux Technical interview questions and answers

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Linux system Troubleshooting – Part 1

1-
How to view all messages generated by the system since the last reboot on RHEL7/CentOS 7?

2- How to check log
messages related to kernel?

3- How can you continuously monitor logs as they come in?

4- Where can
you find messages related to the installation of Linux?

5- Where are most of the log files located?

Linux system Troubleshooting – Part 2

Kernel Parameters – Ulimit

6- To improve
performance, how can you safely set the limit of processes for the super-user root to be unlimited?

7- Where
can you set the resource limits for users logged in via PAM?

8- How to check ulimit for a user?

9-
How to check and increase the limit of opened files in Linux?

10- How to view run time kernel parameters?

11- How to change runtime kernel parameter for maximum shared segment size in bytes?

12- How to view
Boot time parameters and which file is modified to change these parameters?

Linux system Troubleshooting
– Part 3

Troubleshooting with uptime lsof pidof sar and more

13- How to check system load
without top command?

14- By default load average is shown in how many intervals?

15- How can you
get the physical and virtual memory statistics?

16- How to check cpu utilization and other statistics?

17- How to find process id of a process and kill it immediatley?

18- How to list all open files by
specified user?

19- How to list all open files by specified command?

20- How can you list all
network connections by port 22?

Advanced Linux system administrations questions and answers:

1- 
Run a command that shows all lines except any lines starting with the a character “#” in a file?
2- 
How can you continuously monitor log files for errors?
3-  How to automatically remove files older than 7 days by
creating a cron job to run every night?
4-  How to list/print all created users on the system and send(redirect)
them to a file?
5-  How would you list only the 2nd column from a file?
6-  How to broadcast a message to all
logged -in users?
7-  How to create a user with no login access?
8-  How to schedule a server reboot in 15
minutes?
9-  How to find disk usage by the largest directories?
10- How to prevent users from deleting other
users files in a directory?
11- How to display 10th line of a file only?
12- Your server got hacked. Due to
the amount of damage, the whole server needs to be restored.
How would you go about doing that?
13- What
necessary steps should be taken to enhance the security of a server
after the initial install?
14- Which file
is the most commonly known to check for log messages?
15- How and why to disable ping?
16- Explain the
different fields in /etc/passwd?
17- Which cammand can tell how long the system has been running?
18- How to
check if a port is listening?
19- You got a ticket stating server is down, how would you troubleshoot?
20- How
to find all files in /bin with specified(755) permissions?

Part 2: 

1- What is the default port
& configuration file of SSH Server ?

2- How to change the default ssh port in linux ?

3- How
to change Maximum allowed sessions through SSH?

4- What is the configuration file of ssh client ?

5- How to disable SSH root login in linux server ?

6- How to allow only specific users to ssh your linux
server ?

7- SCP and how its used?

8- How to check SSH server’s Version ?

9- How
to setup password less ssh authentication in Linux?

Part 3: 

1- How to extend SWAP space?

2- How to extend a logical volume?

3- How to create a logical volume?

4- How to create a volume
group?

5- How to create a physical volume after the disk space has been added?

6- Is it possible
to increase the logical volume on the fly?

7- How to reduce the logical volume and is it possible to reduce
it on the fly?

8-9- How to scan disks for existing volume group and how to scan a logical
volume from
existing volume group?

10-11-12-13- How to activate, deactivate, disable/enable a logical volume and a volume
group?
How to activated the logical volume which in deactivated state?
How to disable the volume group ? or
Deactivate the volume group?
How to enable the volume group ? or Activate the volume group?

14- What is
the default size of a physical extent in LVM?

15-16-17-
How to list the available logical, physical
volumes and see detailed volume group info on the system?
How to list the available physical volumes in LVM?
How to see the detailed volume group information?

Part 4: 

1- How to find files that are over
10MB in size?

2- How would would you run a command that shows all lines containing a character # in a
file?

3- How would you display all lines of a file with line numbers?

4- How to find current
system information such as the version or release info of your server?

5- Where are the files located for
network interfaces?

6- Which command can you run to find if a certain package has been installed?

7- How to find out total lines in a file without opening that file?

8- How to find disk usage by the
largest directories?

9- How to find all directories named conf under root?

10- How to find files
not accessed in over 3 days?

11- How to view difference between 2 files?

12- What is the location
of system configuration files that should be backed up regularly?

13- What is the command to view all the
currently logged in users?

Linux system administration Q&A

1- Which 2 files contain default
values when creating a user with useradd command?

Questions 2-8 covered in one lecture:

2- What is
the command to create a user with a pre defined uid, shell and
home directory?
3- How to delete a user with
his home directory?
4- How to create a user specifying a primary/Secondary grp?
5- How to change primary group
for any user?
6- How can you give a normal user all the root level privileges?
7- How can you give sudo access
to any user without asking him to
provide password every time he runs a command?
7- How to view the
User’s login and logout details?
8- How to lock & unlock the User Account ?

Questions 9-14
covered in one lecture:

9- What is the command to view and change the expiry date for any user?
10- What
are the fields of /etc/passwd file?
11- What is the difference between .bash_profile and .bashrc?
12- What are
the details you get with finger command?
13- Name 3 files which are automatically created inside any user’s
home directory when a user is
added?
14- What is the command to view all the currently logged in users?

Linux basic system administration questions and answers: 

1- Which 2 files contain the default values
when creating a user with useradd command?

Questions 2-8 covered in part 2:

2- What is the command
to create a user with a pre defined uid, shell and  home directory?

3- How to delete a user with his home
directory?

4- How to create a user specifying a primary/Secondary grp?

5- How to change primary
group for any user?

6- How can you give a normal user all the root level privileges?

7- How can
you give sudo access to any user without asking him to  provide password every time he runs a command?

7- How
to view the User’s login and logout details?

8- How to lock & unlock the User Account ?

Questions 9-14 covered in part 3:

9- What is the command to view and change the expiry date for any
user?

10- What are the fields of /etc/passwd file?

11- What is the difference between
.bash_profile and .bashrc?

12- What are the details you get with finger command?

13- Name 3 files
which are automatically created inside any user’s home directory when a user is  added?

14- What is
the command to view all the currently logged in users?

Linux Basic Technical questions and answers 

How to display hidden files?

Whats the difference between $ and # prompts on CLI?

How to find an
error in a file?

How to make a directory?

How to remove a directory?

How to create a
file?

How to move a file?

How to delete a file?

What is the default port # for DNS

What is the DNS package name?

what is the configuration file for DNS and its location?

List 3 types of file system?

List any 4 Linux flavors?

How to log off from Linux system?

How to check if a package is installed?

How to check your previously typed in commands?

Where are zone files located for DNS?

What is the command to find your current directory?

How to
check file permissions?

How to find file type of a file?

How to find where passwd command is
located?

what command is used for changing file permissions?

What command is used to read
top/bottom part of a file?

How to check mtu, ip and MAC address?

How to get help on certain
commands?

How to find your host name?

How to count total lines of a file?

What is the
command to create a group?

How to reboot a Linux machine with init command?

Where are the user
passwords saved?

How to find running processes on your system?

where is the network time
configuration file located?

When is the last command used?
Who is the target audience?

    Anyone with a desire to pursue Linux as a career.
    Current Linux support professionals who would like to
level up their career.
    Advanced Linux professionals who would like to brush up on their Technical Interview
questions.
    IT Managers who would like to ask better questions in a Technical Linux interview.

Requirements

    Familiarity and understanding of Linux basics.

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