Ansible playbook demo.yaml -name= install nginxhosts= webservertasks=-name: install nginx in serveryum:name: httpdstate: latest Terraform script to insstall ansible and python provider “aws” {access_key = “*******************”secret_key = “*********************”region = “eu-west-3”} resource “aws_instance” “web” {ami = “ami-12345”instance_type = “t3.micro”count = 1tags = {Name = “Demo”}} provisioner “file” {source = “etc/demo.yaml” destination = “etc/demo.yaml”} provisioner “remote-exec” {inline = [“sudo apt update”, “sudo apt install python3 -y”, “sudo apt install ansible -y”] connection {host = self.ipv4_addresstype = “ssh”user = “root”private_key = file(var.pvt_key)} } provisioner

provider “aws” {access_key = “************”secret_key = “************”region = “eu-west-3”} provider “github” {token = “*************”} variable “instance_count” {type = numberdescription = “This is for demo of number variable”default = 3} variable “reponame” {type = stringdescription = “This is for demo of string variable”default = “day3-broad”} variable “users” {type = “list”default = [“demo1”, “demo2”, “demo3”]description = “This is for demo of list variable”} variable “amis” {type = “map”default = {“us-east-1” = “ami-b374d5a5”“us-west-2” = “ami-4b32be2b”}} resource “github_repository” “repo” {name = var.reponamedescription = “Demo

docker ps — To check running containers docker images — To check pulled images docker pull — To pull images from docker hub registry docker push — To push custom images to docker hub registry docker run — To start and run a container docker exec — To enter inside the container with shell docker start — To start a container docker stop — To stop a container docker restart — To restart a container docker build — To build

Both ENTRYPOINT and CMD allow you to specify the startup command for an image. The main difference is we cannot override the ENTRYPOINT instruction by using command-line parameters to the docker run command.

FROM : To create a base image such as an operating system RUN: A RUN instruction is used to run specified commands. We can use multiple RUN instructions to run different commands. CMD: If we need to run a default command that executed for all the containers of the image. If we want to run command during docker run command it overrides the default one. ENTRYPOINT: If we try to specify default arguments in the docker run command, it will

Docker exec command is used run a new process inside the container. Attach isn’t for running an extra thing in a container, it’s for attaching to the running process. Docker attach command is used to attaches to the process that runs in the container with PID. Docker exec is specifically for running new things in a already started container with shell.

Both docker stop and docker kill commands are stopped the container but docker stop command stops the process inside the container and safe. Docker kill command will kill the process inside the container and terminate the running container and unsafe exit for that container.

Docker pause command suspends all processes in the specified containers. Docker unpause command resumes the all suspended processes in the specified containes.

Components of docker are Docker engine Docker registry Docker image Docker container Docker engine Docker engine is a command-line and it is interact with docker daemon. When we run docker commands the instructions sends to the daemon and perform operation by other components. Docker registry Docker registry is a hosted service where the docker images are stored. We can create an repository and store our own images also. It has both private and public repositories. Docker image. Docker image is