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所在平台: Udemy |
课程主页: https://www.udemy.com/course/linux-technical-interview-qa-with-practical-sessions/
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本课程《Linux技术面试QA实战》旨在帮助学习者系统性地掌握Linux在实际工作面试中常遇到的各类问题。课程内容涵盖了Linux用户管理、文件权限、LVM（逻辑卷管理）、Linux启动过程以及SSH（安全外壳协议）等核心领域。 在**用户管理**方面，课程会深入讲解`/etc/passwd`文件的字段含义，如何创建和管理用户，包括指定用户ID、主/次组；用户删除时家目录的处理；以及如何授予普通用户root权限，分析`/etc/group`等文件，并讨论`visudo`命令的重要性。 **文件权限**主题将重点介绍SUID、SGID和Sticky Bit权限的作用与区别，`umask`的配置与影响，`chmod`命令的`-R`参数用法；同时会探讨软链接与硬链接的区别，以及`umask`与`ulimit`的差异。 **LVM**部分，课程将讲解LVM的创建、扩展、缩减逻辑卷的各种方法，扫描LUN/磁盘，激活/禁用卷组和逻辑卷的操作，以及如何查看卷组的镜像信息和列出系统中的各种LVM组件。 **Linux启动过程**将带你了解BIOS、MBR、GRUB/GRUB2的区别，`initramfs`的作用；重点介绍RHEL 7的特性，包括`systemd`的优势和在启动过程中的应用。此外，课程还会教授如何进入和理解Linux的救援模式（Rescue Mode）与紧急模式（Emergency Mode），以及恢复MBR和处理`/bin/mount`丢失等紧急情况。 **SSH**部分，课程将讲解SSH服务器和客户端的配置文件，如何更改默认端口，禁用root登录，限制用户访问；介绍`sshpass`、`scp`命令的用法，文件传输的带宽限制，以及实现密码less SSH认证的方法。 最后，**进程管理**将涵盖进程的定义、列表展示，PID和PPID的概念，进程的nice值设置，以及进程的不同状态（如D状态、Z状态和Paging Stat）。 通过本课程的学习，学员将能够全面理解Linux系统的各项基础和进阶知识，并掌握应对技术面试的实用技巧和常见问题解答。
LINUX Basic Course Outline Here are topic wise Linux System Administrator Interview Questions … Interview Questions on topic User Administration in Linux What the fields of /etc/passwd file?How to create a user with specifying a primary/Secondary grp?How can you create a user without useradd command?What is the default permission on user's home directory?What is the difference between.bash_profile and.bashrc?What is the command to create a user with a pre defined uid, shell and home directory?How to change primary group for any user?If I delete a user, does it's home directory gets deleted? If not then what is the command to delete the home directory of user along with the userName any 3 files which are automatically created inside any user's home directory when a user is added.What is the command to view all the currently logged in users?What is the command to change and view the expiry date for any user?What are the details you get with finger command?How can you give a normal user all the root level privileges?Name any 3 groups of which root is a member by defaultHow can you give sudo access to any user without asking him to provide passord every time he runs a command?Why should I use visudo command instead of directly editing the file with vi or any other editor?Default permission of file and Directory ?How to view the User's login and logout details ?How to check Primary and Secondary Group of One User ?How to lock & unlock the User Account ? Interview Questions on topic permissions in Linux What is the difference between SUID and SGID?What is Sticky Bit permission?What is umask?What is the default umask value for useradd command and where is it defined?Will you be able to cd into a directory with only read permission?What is -R argument used for along with chmod command?How can you restrict a normal as well as root user from making any changes as well as deleting any file?What is the difference between small t and capital T when applying sticky bit permission?List out few of the differences between Softlink and Hardlink?What is the difference between umask and ulimit ? Interview Questions on topic LVM in LINUX How many volume groups can be created in Linux ?Is it possible to increase the logical volume on fly ?How to reduce the logical volume ? is it possible to reduce on fly ?How to increase the logical volume?How to do you scan the new LUN or disk for LVM physical volume ?How to scan disks for existing volume group ? How to scan a logical volume from existing volume group? How to stop the logical volume ? or deactivate the logical volume ?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 ?How do you find that what are the disks are used for logical volume mirroring ? How to list the imported volume groups ?How to list the available logical volumes on the system?How to list the available physical volumes in LVM?How to see the detailed volume group information ? Interview Questions on topic Linux Boot Process Explain booting process ?Define BIOS, MBR?Explain GRUB and how it differs from latest GRUB2?How would you define initramfs and what is its function in the Linux booting process?What is the one new feature of RHEL 7?What is systemd? And tell few features of systemd which makes it differs from other OS.Overview of Systemd in RHEL 7?List few features of Systemd? And tell few features of systemd which makes it differs from other OS.Booting process of RHEL 7?When it is required to boot the Linux box in to rescue mode and how we can boot it on rescue mode?What is the command to change the runlevel in RHEL 7? and also to view what targets are available you can issue the list-units option with the type target?Rescue mode in RHEL7 & how can we boot into Rescue mode?What is basic difference between Rescue & Emergency Mode?How can we recover MBR if it gets corrupted?Suppose someone accidently deleted the mount binary i.e. (/bin/mount) and rebooted the Linux Box, then how would recover your box from this situation? Interview Questions on topic SSH in LINUX What is the default port & configuration file of SSH Server ?How to change the default ssh port in linux ?What is the configuration file of ssh client ?How to disable the root login in linux server ?How to allow only specific users to ssh your linux server ?How to enable debugging in ssh command ?What is the difference between ssh & Telnet ?What is use of sshpass command in linux ?What is the use of scp command ?What is the use of blowfish options in scp command ?How to limit the bandwidth used by scp command ?How to enable passwordless ssh authentication in Linux ?How to check SSH server's Version ?How to Copy the file "server.txt" from the local machine to a remote host using port 2751 in /opt folder.Technical Interview QA on Process ManagementWhat is a prcoess and whats the command to list all the process?How to use custom properties while running a ps command?What is PID & PPID ? Example with an example?What is a nice value & how can we set it for a process?What is 'D Uninterruptible sleep mode?What is Z and paging Stat process stats?
