provider “aws” {region = “ap-south-1”access_key = “”secret_key = “”} provider “github” {token = “”organization = “”} variable “instance_count” {type = numberdescription = “This is for demo of number variable”default = 2 }variable “users” {type = “list”default = [“bharath”, “sharath”, “nikhil”]description = “This is for demo of list variable”} variable “amis” {type = “map”default = {“us-east-1” = “ami-““us-west-2” = “ami-“}} variable “reponame” {type = stringdescription = “This is for demo of string variable”default = “terraform”} resource “aws_iam_user” “iamuser” {name = “${var.users[0]}”}

provider “aws” {access_key = “”secret_key = “”region = “eu-east-2”} resource “aws_instance” “web” {ami = “ami-xbbsj”instance_type = “t2.micro”count = 1tags = {Name = “Demo”}} provisioner “file” {source = “conf/install-apache.yml”destination = “/etc/install-apache.yml”} provisioner “remote-exec” {inline = [“sudo apt update”, “sudo apt install python3 -y”, “sudo apt install ansible -y”] } provisioner “local-exec” {command = “ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -u root -i ‘${self.ipv4_address},’ –private-key ${var.pvt_key} -e ‘pub_key=${var.pub_key}’ install-apache.yml”} } install-apache.yml -name=install_httpdhosts=webservertasks=-name:install httpd in serveryum:name: httpdstate: latest

docker info: displays information about docker installation docker ps : to check the running containers docker ps -a : to check all the containers which are running and exited docker images: to check the list of images docker pull: to pull the image from registry docker push: to push the created image to registry docker stop: to stop the container docker start: to start the stopped container docker kill: to kill the running container unsafe docker rmi: to remove the

both the commands are when we run container using images. ENTRY POINT appends the commands given in command line CMD overrides the command given in command line

FROM : To get the base image MAINTAINER: author of the generated image ADD: It is similar to COPY but it supports get remote URLs and also unzips tar balls RUN: Run is used to run specific commands. CMD: This is similar to ENTRYPOINT it allows the override the command ENTRYPOINT: after starting the container it is the initial process that runs. Entry point doesn’t allow override the command WORKDIR: Used to create working directory inside the container. COPY: copy

when we use Docker attach it will takes to PID 1 and it will wait for input and when we exit the terminal the container is no longer up. When you use docker exec and if you exit the container is still running. Both are used to check the running container if you want to do without exiting the running container use docker exec

Docker stop will stop the running container send SIGTERM and then SIGKILL with grace period. Docker kill will kill the running container with SIGKILL and is unsafe exit

docker pause will pause the processes running inside the containerDocker unpause will unpause the processes which are paused

Docker Engine:It is the main part of docker system. It follows client-server architecture.It is installed on host machine. It contains:1.Server: It is called as dockerd used to manage images containers network2.Rest API: used to instruct daemon3.CLI: where we run the docker commands Docker Client:when you run commandon CLI client sends to daemon which makes the action.Docker clientcan communicate with more than one daemon Docker Registry:It is the location where docker images are stored.it can be public or a privatewhen we