Getting Started With Linux Administration

Getting Started with Linux Administration

What will you learn today?
 Why you should learn Linux?
 Roles & Responsibilities of a Linux Administrator
 Installation and Upgradation in Linux
 Storage Migration using LVM
 User Administration in Linux
www.edureka.co/linux-admin

Why Linux?
Multiple
Distributions
Very Easy To Learn and Use
Very Secured
Freely Available
Fast and Effective
Virus Free

Roles & Responsibilities
 Installation & Upgradation
 Patching
 Application support
 Storage migrations
 User Administration
 Installation and configuring servers/services
 Backup & Restore
 Troubleshooting
 Network Engineer
 Linux Admin
 System Engineer
 Application support
 Support Engineer
 Software Engineer

Installation & Upgradation
 Performing manual & network based installations
 VMWare installations
 Implementation OS upgradation by performing
necessary tests
 Writing and implementing necessary pre & post
install scripts as a part of installation

Installation
 Power on your computer system.
 Go to BIOS setup and change your first boot device to CD/DVD
 Insert the CentOS CD/DVD disk into your computer
 Follow steps from the installation guide in LMS.
 For installing as a VM, install Virtual manager software for your OS.
 Start VM and select CentOS as guest OS.
 Insert the CentOS CD/DVD disk into your computer
 Follow steps from the installation guide in LMS.
Pre-requisites
OR

RPM Package Manager
 RPM provides complete software packaging features, including pre-and post-install scripts, dependencies, meta
information, and an installed software database
 The database of all installed software maintained on the machine comes in handy for tracking and updating,
dependency verification, and software management
 RPM format – Packagename.version.release.architect.rpm
Prerequisites

RPM Package Manager (Contd.)
RPM Features :
 Provides package management:
»Install
»Remove or Uninstall
»Query
»Upgrade
»Verify
 Automatically verifies packages using GPG, MD5, SHA1SUMs
 Automatically reports on unresolved dependencies

Patching
 Deploying patches in test, monitor and deploy to production
$ patch < patch.file $ patch source.code.file < patch.file $ patch -p LEVEL < {/path/to/patch/file}
 Documentation  Bug fixes

How to Apply a Patch?

Application Support
 Perform system/application installation
 Perform system/service problem
management and troubleshooting
 Execute system/service configuration management

Application Support
 Participate in ticket support for internal teams and
external vendors by troubleshooting customer issues in
Production, Pre-Production and Customer test
environments
 Track day to day incidents and issues using special
monitoring tools

Storage Migrations
Migrating LVM partitions
• One of the excellent feature, where we can migrate the logical volumes to a new disk without the data-loss and
downtime.
Map networks
• Nagios/Nagvis, Mila_Ajax_Map, Safe Mapping and Reporting Tool (SMART), Network Scaner, NMap Console

Storage Migrations
Check file system layout
LUN
• virtual layer between physical disk and application

User Administration
 Creating / Using groups
 Managing user accounts
 Automation if needed

User Administration
User Administration
 To manage users via command line, the following commands are used
» useradd
» usermod
» userdel
» passwd
 The user configuration files are stored in two files
» /etc/passwd
» /etc/shadow

User Administration – cat command (Contd.)
Adding a New User Account
 Syntax: useradd [options] username
 Command: useradd edureka1
To set password for a specific user
 Syntax: passwd username
 Command: passwd edureka1
passwd without argument defaults
to change the password of the
currently logged-in user

User Administration - Modifying Accounts
Modifying / Deleting User Accounts
Usermod command is used to edit/modify or
delete user accounts
 syntax: usermod [options] username
To change user’s home directory
 Command: usermod -d /home/edureka3
edureka3
 The usermod -d option changed the user’s
home directory from /tmp/edureka3 to
/home/edureka3

User Administration – Sudo users
Sudo user
 Sudo allows a permitted user to execute a
command as the superuser or another
user as specified by the security policy

User Administration – Sudo users (Contd.)
Sudo user
 visudo command edits /etc/sudoers file in
a safe fashion, locking the file from making
simultaneous edits

User Administration - Setting ACL
Access Control Lists (ACLs)
Setting ACL
 Command: setfacl -m u:edureka:rw linux.txt
 Assigned read and write permission to user
edureka

User Administration - Remove Permissions
Access Control Lists (ACLs)
Remove permissions for the user
 Command: setfacl -x u:joial linux.txt

Configuring Services
Manage high availability and high traffic servers
Maintain the performance, security,
consistency, backup and availability of servers
Server Administration
Working on open source software
Proactive Server Monitoring
Writing Scripts for Systems management &
automation
Ticket handling

Course Details
Become an expert in Linux Administration
Go to www.edureka.co/linux-admin
Edureka's Linux Administration course:
• This course is designed to shape you as a Linux professional & help you to run applications, perform desired functions on your
system and networks, create a network configuration, and maintain security administration.
• You will work on a Project which involves performing some of the day-to-day activities you would need to do as a Linux
administrator.
• Online Live Courses: 42 hours
• Assignments: 25 hours
• Project: 20 hours
• Lifetime Access + 24 X 7 Support

Thank You
Questions/Queries/Feedback
Recording and presentation will be made available to you within 24 hours

Getting Started With Linux Administration

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