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 defaultsto change the password of thecurrently logged-in user

User Administration - Modifying Accounts


Modifying / Deleting User Accounts

Usermod command is used to edit/modify ordelete user accounts

syntax: usermod [options] username

To change user’s home directory

Command: usermod -d /home/edureka3edureka3

The usermod -d option changed the user’shome 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 useredureka

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

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