Lesson 22 – Introduction to Linux Systems Administration

About Linuxconf Managing users Network configuration Managing client NFS file systems with Linuxconf Linux command-line basics OVERVIEW

Administrative tasks: User administration. Network administration. Disk administration. About LINUXCONF

Start Linuxconf: Invoke linuxof command from terminal window. About Linuxconf

Linuxconf’s first-time starting window

About Linuxconf Linuxconf’s opening window

Adding users. Removing users. Editing users. Changing root’s password. MANAGING USERS

Adding users

User Accounts menu’s options

Adding users

Adding a user

Adding users

Removing users

Editing users

Changing root’s password

Changing your host name. Changing your IP address. Working with /etc/ hosts file. Changing DNS client configuration. Changing your default route. Changing how host names are looked up. NETWORK CONFIGURATION

Changing your host name

Changing your IP address

Changing IP address

/etc/hosts file - Add entries

Editing the /etc/ hosts file via Linuxconf

/etc/hosts file - Add entries

/etc/hosts file - Edit entries

/etc/hosts file - Remove entries

Changing DNS client configuration

Changing your default route

Changing how host names are looked up

Changing order in which host names are looked up

Changing how host names are looked up

Adding an NFS mount. Editing a mount point. Removing a mount point. MANAGING CLIENT NFS FILE SYSTEMS WITH LINUXCONF

Adding an NFS mount

Adding NFS mounts

Adding an NFS mount

Editing a mount point

Removing a mount point

Environment variables. Nuances on the command-line. Documentation tools. File listings, ownerships, and permissions. File management and manipulation. Process manipulation. Miscellaneous tools. LINUX COMMAND-LINE BASICS

Printing environment variables: Use printenv command to list variables. Use printenv and a specific environment variable to see a variable. Environment variables

Setting environment variables: Use variable=value. Environment variables

Clearing environment variables: Use the unset command. Environment variables

Wildcard characters: Asterisk (*) Question mark (?) Nuances on the command-line

Environment variables as parameters: Command line parameters include environment variables. Nuances on the command-line

Multiple commands: Can be executed on the same line by separating commands with a semicolon (;). Nuances on the command-line

Back ticks (`): Embeds commands as parameters to other commands. Nuances on the command-line

Man command: Documents found online covering tools usage and corresponding configuration files. Format is man program_name. For example, man useradd. Documentation tools

Info command: Info pages are a common feature of documentation. Documentation tools

ls command: Lists all the files in a directory. File listing, ownerships, and permissions

About files and directories: Normal files Directory files Hard links Symbolic links File listing, ownerships, and permissions

About files and directories: Block devices Character devices Named pipes File listing, ownerships, and permissions

chown: Change ownership File listing, ownerships, and permissions

chgrp: Change group File listing, ownerships, and permissions

chmod: Change mode. Permissions are broken into 4 parts. Octal/Symbolic representations. File listing, ownerships, and permissions

Commands: cp: Copy files. mv: Move files. ln: Link files. find: Find a file. dd: Convert and copy a file. gzip: Compress a file. File management and manipulation

Commands: mknod: Make special files. mkdir: Create a home directory. rmdir: Remove a directory. pwd: Show present working directory. tar: Tape archive. cat: Concatenate files. File management and manipulation

Commands: more: Display a file one screen at a time. du: Disk utilization. which: Show directory in which file is located. whereis: Locate Binary, Source, and Manual Page for a command. df: Find out amount of free disk space. sync: Synchronize disks. File management and manipulation

Commands: ps: List processes. top: Show an interactive list of processes. kill: Send a signal to a process. Process manipulation

Commands: uname: Show system name. who: Find out who is logged in. su: Switch users. Miscellaneous tools

About Linuxconf: User administration. Network administration. Disk administration. SUMMARY

Managing users: Adding users. Removing users. Editing users. Changing root’s password. Summary

Network configuration: Changing your host name. Changing your IP address. Working with /etc/ hosts file. Changing DNS client configuration. Changing your default route Changing how host names are looked up. Summary

Managing client NFS file systems with Linuxconf: Adding an NFS mount. Editing a mount point. Removing a mount point. Summary

Linux command-line basics: Environment variables. Nuances on the command-line. Documentation tools. File listings, ownerships, and permissions. File management and manipulation. Process manipulation. Miscellaneous tools. Summary