Lab Environment

• Create an ubuntu 18.04 vm on any virtual environment
• Create an Centos 7 vm on any virtual environment
• For more info refer video content here

Basic Software(Application)

• Any software(Application) in linux is some files or folders or both copied to linux machine.
• Just like .exe file in windows, we have executable permissions in linux
• Lets try to evaluate ping

whereis ping

ls -la /usr/bin | less

Environmental Variable PATH

• PATH will contain directories where linux will search for executables.
• If your executable/application folder is not added to PATH then to run your application you need give full path.

Installing Softwares on Linux

• Many ways of installing softwares. Popular ones are
  • 1
  • Get the Code of the software and build the code locally in linux machines
  • Use Debian/RPM packages to install softwares
  • Use YUM/APT/Snap to install softwares.

Downloading software executable directly

• Example: Terraform.

# note : Ensure unzip is installed (sudo apt-get install unzip -y)
wget https://releases.hashicorp.com/terraform/0.12.23/terraform_0.12.23_linux_amd64.zip
unzip terraform_0.12.23_linux_amd64.zip
ls -al .

• two ways of running executables
  • Copy application to existing folders in PATH
  • Create a new folder copy executable into it and add new folder to PATH variable

# 1st approach of copying to existing folders in PATH
cp /home/ubuntu/terraform /usr/bin/
terraform --version

# 2nd approach
mkdir mybin
cp /home/ubuntu/terraform /home/ubuntu/mybin/
export PATH=/home/ubuntu/mybin/:$PATH
terraform --version

• Exercise: Install Packer from https://packer.io/downloads.html

Building Code into package(application)

• To build the code there is a popular tool called as make
• Lets understand the make by installing nagios. Refer Here

using Debian or rpm packages

• Download the debian package and to install execute

sudo dpkg -i <package path>

• Refer Elastic Beats installation From Here
• Download the rpm package and to install execute

sudo rpm -ivh <package path>

• Refer Elastic Beats installation From Here