A Day In The Life Of A Linux Administrator

A day in the life of A linux administrator

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Why you should learn Linux

What are the responsibilities of a Linux Admin

How Installation and Upgradation is done

LVM Storage Migration

User Administration in Linux

How to Configure Services in Linux

By the end of this webinar, you will be able to understand:

Objectives

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Multiple Distributions

Very Easy To Learn and Use

Very Secured

Freely Available

Fast and Effective

Virus Free

Why Linux?


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

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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

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Check file system layout

LUN

• virtual layer between physical disk and application

Storage Migrations


User Administration

Creating / Using groups

Managing user accounts

Automation if needed


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


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

User Administration – cat command (Contd.)

passwd without argument defaultsto change the password of thecurrently logged-in user


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 theuser’s home directory from/tmp/edureka3 to/home/edureka3

User Administration - Modifying Accounts


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


Sudo user

Visudo command edits /etc/sudoers file in

a safe fashion, locking the file from making

simultaneous edits

User Administration – Sudo users (Contd.)


Access Control Lists (ACLs)

Setting ACL

Command: setfacl -m u:edureka:rwlinux.txt

Assigned read and write permission touser edureka

User Administration - Setting ACL


Access Control Lists (ACLs)

Remove permissions for the user

Command: setfacl -x u:joial linux.txt

Removed ACL entries assigned to user joial

User Administration - Remove Permissions


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


Reference ( Images ):

• www.geekrepublic.org• www.automationworld.com• www.talktohacker.com

Questions


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Date post:	17-Aug-2015
Category:	Technology
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A Day In The Life Of A Linux Administrator

Technology