Linux Boot camp Series – 21/Mar/2020

Package Based Software Installation on Centos/RedHat

Lab Setup

• Centos Machine: Ensure you create one centos/RHEL machine

YUM (Yellowdog Updater Modified)

• Opensource tool developed for RPM Based Packages by RedHat
• Main configuration file will be at /etc/yum.conf which specifies repository locations at /etc/yum.repos.d
• Yum will pick any file with extension .repo

Yum commandline

• Searching the package:
  • Syntax by using command line: yum search <package-name>
  • Example: Lets try to find a openjdk8 package yum search openjdk
  • Example: Find a package to install nginx
• In your system there is some executable, you want to which package can be used to install that executable
  • Syntax: yum whatprovides '*/executable'
  • Example “`yum whatprovides ‘*/git’
• To install any package
  • Synatax: yum install <package-name>
  • Example: Install openjdk11

  sudo yum search openjdk
  sudo yum install java-11-openjdk-devel
  

• To install using rpm you can use sudo yum localinstall <path-to-rpm>
• Displaying information about package sudo yum info <package-name>
• Display all the packages installed sudo yum list installed
• List all the available packages sudo yum list
• Uninstall a package is sudo yum remove <package>
• Exercise: Install any version of tomcat using yum commands

yum search tomcat
yum -q list available --showduplicates tomcat
yum install tomcat -y

• To Check updates to the system

yum check-update

• To apply all updates

yum update

• To apply update to specifc package

yum update <package-name>

• If you need add a custom repository to the yum add .repo file in /etc/yum.repos.d and then install the additional packages. Refer Here for elastic file beat installation

Managing repositories using yum

• Display all the enabled repositories

yum repolist

• Display all the available (enabled or disabled) repositiries

yum repolist all

• Enabling a repository

yum-config-manager --enable <repo id>

History management using yum

yum history
# use id 

yum history undo <ID>

Exercise

• Install ansible control server on Centos7
• Install nginx on Centos7
• Install nodejs on Centos7