DevOps Classroomnotes 05/Apr/2023

Application Deployments

Generation 1: Directly run on Physical Servers
- Directly run on physical servers
- If your application is not utilizing hardware completely, ROI is very long
Generation 2: Hypervisors create virtual machines and applications installed in virtual machines
- Hypervisors perform hardware virtualizationa and provide
  - virtual cpu
  - virtual ram
  - virtual disk
  - virtual network
- In the isolated area created by hypervisor, we can install os and necessary softwares
- Application can be installed and used from here
- Better ROI
Generation 3: Containers: These are isolated areas which look like vms but the container is an isolated area which has virtualized os.
- Applications running in Containers will not feel the difference
- We can run more applications on a single box

Docker (dock worker) is used to create containers which is standard way of packaging any application
Application can be any of the below but have a standard way of packaging i.e docker image.
- developed in any technology
- developed on any server
Packaging in docker image format helps us to run our application

Containerize any application run by your organization.
Manage Data, Security and Networks for containerized applications.
To acheive the above expectations, we need to use
- docker and understand how it runs and creates containers
- play with docker aroud networks, data and security
- apply them to our application.

sudo apt update
sudo apt install apache2 -y