Cloud DevOps Engineer

The three types of EC2 instances based on the costs are:

On-Demand Instance - These instances are prepared as and when needed. Whenever you feel the need for a new EC2 instance, you can go ahead and create an on-demand instance. It is cheap for the short-time but not when taken for the long term.

Spot Instance - These types of instances can be bought through the bidding model. These are comparatively cheaper than On-Demand Instances.

Reserved Instance - On AWS, you can create instances that you can reserve for a year or so. These types of instances are especially useful when you know in advance that you will be needing an instance for the long term. In such cases, you can create a reserved instance and save heavily on costs.

Auto Scaling is a feature in aws that automatically scales the capacity to maintain steady and predictable performance. While using auto scaling, you can scale multiple resources across multiple services in minutes. If you are already using Amazon EC2 Auto- scaling, then you can combine Amazon EC2 Auto-Scaling with the Auto-Scaling to scale additional resources for other AWS services.

Benefits of Auto Scaling

1) Setup Scaling Quickly : 
It sets the target utilization levels of multiple resources in a single interface. You can see the average utilization level of multiple resources in the same console, i.e., you do not have to move to the different console.

2) Make Smart Scaling Decisions : 
It makes the scaling plans that automate how different resources respond to the changes. It optimizes the availability and cost. It automatically creates the scaling policies and sets the targets based on your preference. It also monitors your application and automatically adds or removes the capacity based on the requirements.

3) Automatically maintain performance : 
Auto Scaling automatically optimize the application performance and availability even when the workloads are unpredictable. It continuously monitors your application to maintain the desired performance level. When demand rises, then Auto Scaling automatically scales the resources.

Amazon EC2, or Elastic Compute Cloud as it is called, is a secure web service that strives to provide scalable computation power in the cloud. It is an integral part of AWS and is one of the most used cloud computation services out there, helping developers by making the process of Cloud Computing straightforward and easy.

Lifecycle hooks perform custom actions by pausing instances when Autoscaling group launches or terminates an instance. When instance is paused, an instance moves in a wait state. By default, an instance remains in a wait state for 1 hour. For example, when you launch a new instance, lifecycle hooks pauses an instance. When you pause an instance, you can install a software on it or make sure that an instance is completely ready to receive the traffic.

They are executable packages(bundled with application code & dependencies, software packages, etc.) for the purpose of creating containers. Docker images can be deployed to any docker environment and the containers can be spun up there to run the application.

This can be done using the docker load command and the syntax is 
docker load -i .tar

The Namespace in Docker is a technique which offers isolated workspaces called the Container. Namespaces also offer a layer of isolation for the Docker containers.

CMD defines default commands and/or parameters for a container. CMD is an instruction that is best to use if you need a default command which users can easily override. If a Dockerfile has multiple CMDs, it only applies the instructions from the last one.

ENTRYPOINT is preferred when you want to define a container with a specific executable.
You cannot override an ENTRYPOINT when starting a container unless you add the --entrypoint flag.

The different stages of the docker container from the start of creating it to its end are called the docker container life cycle.The most important stages are:

1) Created: This is the state where the container has just been created new but not started yet.
2) Running: In this state, the container would be running with all its associated processes.
3) Paused: This state happens when the running container has been paused.
4) Stopped: This state happens when the running container has been stopped.
5) Deleted: In this, the container is in a dead state.

Choose Merge : 
1) Whenever we want to add changes of a feature branch back into the base branch.
2) If you want to keep the same history rather than rewrite it.
3) If you want to revert the changes quickly


Choose Rebase : 
1) Whenever we want to add changes of a base branch back to a feature branch.
2) Squash multiple commits
3) Reiterate each commit and update the changes
4) Reverting rebase would be very difficult

Git stash can be used in cases where we need to switch in between branches and at the same time not wanting to lose edits in the current branch. Running the "git stash" command basically pushes the current working directory state and index to the stack for future use and thereby providing a clean working directory for other tasks.

Tip 1 : Prepare the points that you will speak in your introduction prior to the interview.
Tip 2 : Tell about your current cgpa, achievements and authenticated certification
Tip 3 : I told about my role in current internship and what all I do