Linux Topic

Introduction to Linux and UNIX

Duties Of A Linux Administrator

https://linuxadminlinux.blogspot.com/2019/04/duties-of-linux-administrator.html

this will ask you for the restart or shutdown you linux machine

https://linuxadminlinux.blogspot.com/2019/04/this-will-ask-you-for-restart-or.html

• History of UNIX & LINUX
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• https://linuxadminlinux.blogspot.com/2019/02/history-of-unix-and-linux.html
• Basic Concepts of Operating Systems, Kernel, shell and file system structure
• https://linuxadminlinux.blogspot.com/2019/04/what-is-kernel.html
• https://linuxadminlinux.blogspot.com/2019/04/basic-concepts-of-operating-systems.html

 Installation of Linux

• Different types of Installation Methods
• GUI
• Text
• https://linuxadminlinux.blogspot.com/2019/04/rhel-7-virtualbox-installation.html

 Linux System Structure

• Basic concepts of Linux
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• https://linuxadminlinux.blogspot.com/2019/04/basic-concepts-of-linux.html
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• Differences between Red Hat Enterprise Linux & CentOS
• 
  
• https://linuxadminlinux.blogspot.com/2019/04/differences-between-red-hat-enterprise.html

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• Basic bash commands of Linux
• https://linuxadminlinux.blogspot.com/2019/04/basic-bash-commands-of-linux.html
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• Editors [GUI & CLI]
• https://linuxadminlinux.blogspot.com/2019/04/gui-and-cli-linux.html

Boot Process of Linux

• What is booting and boot process of Linux?
• https://linuxadminlinux.blogspot.com/2019/04/rhel7-boot-process-step-by-step.html
• https://linuxadminlinux.blogspot.com/2019/04/linux-boot-sequence.html
• Init Process or 
• https://linuxadminlinux.blogspot.com/2019/04/init-process-in-linux.html
• Runlevels
• https://linuxadminlinux.blogspot.com/2019/04/runlevel-in-linux.html

Software Package Administration

• Description of a Repository
• https://linuxadminlinux.blogspot.com/2019/04/a-linux-repository.html
• Difference between RPM and YUM
• https://linuxadminlinux.blogspot.com/2019/04/yum-vs-rpm.html
• Configuration of YUM server
• https://linuxadminlinux.blogspot.com/2019/04/how-to-configure-yum-repository-in-rhel.html
• Installing and deleting software packages
• https://linuxadminlinux.blogspot.com/2019/04/installing-software-on-linux.html
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• Querying and updating software packages
• https://linuxadminlinux.blogspot.com/2019/05/rpm-commands-in-linux-with-examples.html

User and Group Administration

• Types of Users in Linux
• Creating and deleting Users and Groups
• Modifying Users profile
• Adding Users into the Groups
• Important system files related to User & Group administration
• https://linuxadminlinux.blogspot.com/2019/05/what-are-user-and-group-permissions.html

Advanced File Permissions

• Importance of Permissions
• Types of Permissions
• User level Permissions
• Group level Permissions
• Setting Access Level Permissions on Users & Groups
• https://linuxadminlinux.blogspot.com/2019/05/advanced-file-permissions-in-linux.html
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 Disk Partitioning and Mounting File System

• Definition of Partition
• Types of Partitions
• Difference between ext2, ext3 and ext4 file systems
• Creating partitions using fdisk utility
• Formatting partitions using mkfs to create filesystems
• Mounting various filesystems temporarily and permanently

https://linuxadminlinux.blogspot.com/2019/05/unixlinux-partitions-and-file-systems.html

Logical Volume Management

• What is LVM?
• Conversion of Partition into Physical Volume
• Creating volume groups and logical volumes
• Mounting the logical volume filesystems
• Extend and Reduce the logical volumes.
• Data storage using LVM
• Renaming volume groups and logical volumes
• Removing physical volume, volume group and logical volume

https://linuxadminlinux.blogspot.com/2019/05/linux-lvm-logical-volume-manager.html

Backup and Recovery

• Introduction to various types of backup media
• Backup and restoring using tar commands
• https://linuxadminlinux.blogspot.com/2019/05/how-to-do-backup-restore-in-linux.html
• Automation of Jobs
• https://linuxadminlinux.blogspot.com/2019/05/automation-of-jobs.html

NFS

• Configuring NFS server
• Mounting NFS exports on clients

 NIS

• Basics of NIS
• Configuring NIS Servers and client
• Creating NIS users

DNS

• Basics of Internet
• Basics of DNS and BIND 9
• Configuring DNS primary server

DHCP

• Configuring Linux as DHCP Server
• Configuring various clients for DHCP Server

Web Server (Apache)

• Basics of Web Service
• Introduction to Apache
• Configuring Apache for main site
• Configuring Apache for multiple sites using IP-based, port based and name-based

FTP Server

• Basics of File Transfer Protocol.
• Configuring vsftpd for anonymous ftp service.

Proxy Server (SQUID)

• Basics of proxy services
• Configuring proxy services
• Creating ACL’s for controlling access to internet

 Samba Server

• Basics of file sharing in Windows
• Configuring Samba service for file sharing with windows systems

Mail Server Configuration

• Basics of Mail Servers
• Configuring SMTP service using sendmail

 Log Server

• Importance of logs
• Configuring Syslog Messages

 Network Connections

• Configuring Physical IP Address
• Configuring Virtual IP Address
• Enabling & Disabling the Network Connections
• Iptables

 Basics of Shell scripting

 Troubleshooting Linux

• Recovering the super user password.
• Troubleshooting network related problems.

Roles of Linux Engineer:

• Worked as a Linux Engineer in 24/7 team responsible to maintain servers and provide FCR at any point of time.
• Monitoring/Troubleshooting the following alerts/issues.
  1. CPU
  2. Load Average
  3. Memory Usage
  4. Network Issues
  5. Disk Space issues
  6. Service Status
  7. Website Blips
• Perform the TRIAGE with regards to the alerts by following SOP and find the RCA.
• Escalating the alerts to level-2 team incase unable to provide resolution.
• Creating a production ticket for each and every alert.
• Open trouble tickets with the 3rd party service provider for any network outages, site blips, database issues & Disk failed issues.