Chia Sẻ Khóa Học Câu Hỏi Và Câu Trả Lời Phỏng Vấn Kỹ Thuật Linux 2019 [Khóa 9957 A]
04 tháng 7 2019
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Một số Nội dung Chính:
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?
Student suggested Videos
19 new Lectures added to student suggested videos Section:
- Boot Process RHEL/CentOS 6 and 7
- Run Levels
- Targets
- NIC Bonding
- What are Linux Distributions?
- What are the advantages of using Linux?
- What is Linux?
- What is a virtual environment or virtualization?
- How to download and install Oracle Virtual Box?
- How to download and install Redhat Linux?
- How to download, install and connect through putty?
- What are different ways of accessing a Linux Server?
- What is absolute vs relative Path?
- How to Count Words, Lines and Characters in a file?
- How to display and set the server's Hostname?
- Explain vi editor basics?
- How to list and modify System Timezone?
- How to find help within Linux?
- How to compress and archive files?
New Section added: "Directory structure, Files, directories, permissions and more"
14 new lectures added:
- Explain Linux Directory Structure
- What are the common file types used in Linux?
- How to create files and directories?
- How to list files and directories?
- How to display File Contents with cat, less, more and tail?
- How to copy directories and files?
- How to move or rename directories and files?
- How to remove directories and files?
- What are the file and directory control Attributes?
- Basics of File and Directory Permissions
- How to modify file permissions?
- Explain default permissions and umask?
- How to modify file ownership and group membership?
- What are special permissions: setuid, setgid and sticky bit?
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