Linux System Administration
Actions for Shells
Linux shells are used to enter commands to perform functions in your Linux distribution. Describe the shells which are available. Which one would be your preference? Why?
Actions for Redirections
Linux distributions have three basic forms of Input/Output (standard input, standard output, and standard error) redirections which will need to understand how to use each one.
• State the purpose of each of three I/O forms including which file descriptor is used for each one
• Provide your own redirection command syntax example as well as description what your command syntax will do
(optional-challenging) How would command syntax appear if you want redirect the cat command standard ouput and standard error to the same file? This would be useful if you want to view results of the cat command in a file containing both regular output and any error(s) which might appear (ex. syntax error).
3) File-Viewing Commands
Actions for File-Viewing Commands
Three file-viewing commands (head, tail, and less) are used to display a portion of a file. These are especially useful when you have a very large text file you want to view and you want to narrow you display of it.
Provide me one or more command syntax examples using each of the three file-viewing commands. You must provide me using at least one command option (ex. with head command you can specify the number of lines to display using “-n num” option).
Actions for bash
What are some reasons why bash is considered a defacto standard shell on Linux distributions?
5) inittab File
Actions for inittab File
/etc/inittab file is one of the most important files on a Linux (and UNIX) operating system. It is read when the Linux /sbin/init program starts your system. The /etc/inittab file lists what programs to start depending on the run level.
Provide a sample syntax (id:runlevels:action:process) of an /etc/inittab entry as follows:
id = identify your entry
runlevels = specify that the process will run at run levels 3 and 5
Action = specify to init program how to treat the program
Process = provide your own name including if there is any input or output redirection
6) Localization and Internationalization
Actions for Localization and Internationalization
Since Linux is an international operating system you can configure it to support a specific region. Discuss how you can configure its character set, keyboard layout, and date/time display formats for a specific region (or country) of your choice.
7) Default User Accounts
Actions for Default User Accounts
What default user accounts are created during installation? What are they for? What should you do with them? Explain in detail.
8) Installation Sources
Actions for Installation Sources
What type of installation sources are available for Linux? What are the differences? Give some advantages and disadvantages of each of them.
Actions for runlevel
How many runlevel are there? Explain each one and when would you use each of them.
10) Package Dependencies and Conflicts
Actions for Package Dependencies and Conflicts
Linux software packages have dependencies and conflicts that can occur for numerous reasons. Discuss at least 3 ways they can occur
11) RPM vs Debian
Actions for RPM vs Debian
Compare Red Hat Package Manager vs Debian package Manager. How are they similar and how are the different
12) Modifying User Accounts
Actions for Modifying User Accounts
The usermod command is used to change a Linux user account settings. There are a few of parmeters (ex. “-l” to change the user name) require considerations before using with the usermod command. Discuss a specific parameter you would used with the usermod and what you need to consider either before or after applying your usermod. Also, provide an example of your usermod command including the parameter.
13) useradd vs. adduser
Actions for useradd vs. adduser
The useradd utility is used to create user account but on some Linux distributions we also have adduser script to create users as well. Explain the differences between these two utilities to create user accounts on Linux distributions. Which one would you use ?
Actions for Groups
When creating user account using useradd how is the default group determined? Is there a default group users are added automatically unless specified in the useradd command ?
15) Partitioning a Disk
Actions for Partitioning a Disk
Discuss the steps required (including exact commands) to partition a disk using the fdisk utility.
16) Mounting a File System
Actions for Mounting a File System
Provide the steps required to create and then mount a filesystem
17) Different Disk Types
Actions for Different Disk Types
What type of disk does each of the following represents ?
18) USB Basics
Actions for USB Basics
Discuss USB capabilities you can configure in your Linux distribution
19) File System Health
Actions for File System Health
What are some of the tools you can use to tune or correct a Linux filesystem?
20) Coldplug vs. Hotplug Devices
Actions for Coldplug vs. Hotplug Devices
Explain the differences between coldplug verses Hotplug devices. Provide examples of coldplug devices as well as a hotplug device.
21) /proc directory
Actions for /proc directory
/proc directory is a virtual filesystems that provides information about hardware, running processes, etc.. Lists at least three files located in /proc that you can reference to determine the hardware resources for devices installed on your Linux distribution.
22) ps Command
Actions for ps Command
ps command is use to list processs running on your Linux system. Provide five examples using the ps command
23) runlevel Services
Actions for runlevel Services
when you move from one run level to the next there are certain methods you can use to make that happen. Explain how /etc/inittab file and specific commands are used to manage runlevel services.
24) Aliases and Environment Variables
Actions for Aliases and Environment Variables
Explain the function of environment variables.
What is the purpose of shell aliases? Provide an example of a alias you may use.
Actions for syslogd
The syslogd daemon maintains logfiles on Linux distribution. Discuss how you would use the syslogd daemon to maintain a log file.
26) System Time
Actions for System Time
There are two methods of changing system time: date command and Network Time Protocol (NTP). Discuss the significant advantages using NTP has over manually setting time using date command
27) Local Security Good Practices
Actions for Local Security Good Practices
Discuss in detail several effective local security practices to harden your Linux distribution.
Actions for ssh
Discuss what is SSH and the advantages and disadvantages of using it on your Linux distribution.
Also discuss how to control ssh access and how you configure this service.
29) Resolving Hostnames
Actions for Resolving Hostnames
Compare and contrast the following programs which are helpful in debugging TCP/IP networks:
Actions for DNS
Discuss how you would configure your Linux distribution to perform name resolution using DNS.
Actions for XDM
A manager has asked the administrator to change the default background of her machine, which uses XDM. Which file does the administrator need to modify in order to achieve this?
Explain the main differences between XDM and KDM. Which would you prefer?
32) Linux-based Systems
Actions for Linux-based Systems
Please provide one example of a Linux Based (i.e. router, hypervisor, appliance, etc.) system.
Provide a brief product description, use, and function
Actions for lsof
Discuss how you would use the lsof command. Provide some command examples
34) Day Light Saving Time
Actions for Day Light Saving Time
Must post first.
As everyone knows Daylight Savings Time (DST) events second Sunday 2am in March and first Sunday 2am in November for the states that participate. What can you do to verify your Linux distribution won’t have any issues?
Actions for vi
vi editor is a standard editor found on all Linux and UNIX systems. It is best to be able to use it to insure you can edit a file.
Provide me at least five command line keys you can use when editing a file using vi editor. Include a description for each commmand line key
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