CometChat Devops Engineer Interview Questions, Process, and Tips

Kubernetes can be implemented on AWS using Elastic Kubernetes Service (EKS) or self-managed Kubernetes clusters.

• EKS is a managed Kubernetes service provided by AWS

• Self-managed Kubernetes clusters can be set up using EC2 instances and other AWS services like Elastic Load Balancing, Elastic Block Store, etc.

• AWS provides tools like kops and eksctl to simplify the deployment and management of Kubernetes clusters on AWS

Docker Swarm is a container orchestration tool that is simpler to use than Kubernetes.

• Docker Swarm is built into Docker Engine, while Kubernetes requires additional installation.

• Docker Swarm is easier to set up and manage than Kubernetes.

• Kubernetes is more powerful and flexible than Docker Swarm, with more advanced features for scaling and managing containers.

• Kubernetes has a larger community and more third-party tools...read more

AWS architecture consists of various components such as compute, storage, database, networking, security, and management tools.

• Compute: EC2, Lambda

• Storage: S3, EBS, EFS

• Database: RDS, DynamoDB

• Networking: VPC, Route 53

• Security: IAM, KMS

• Management Tools: CloudFormation, CloudWatch

EKS is a managed Kubernetes service, ECS is a container orchestration service, and Beanstalk is a PaaS for deploying web applications.

• EKS is best for running Kubernetes workloads on AWS

• ECS is best for running containerized applications on AWS

• Beanstalk is best for deploying web applications without worrying about infrastructure

• EKS and ECS both offer auto-scaling and load balancing capabilities

• Beanstalk supports multiple

ELB services of AWS are load balancing services that distribute incoming traffic across multiple targets.

• ELB stands for Elastic Load Balancer

• There are three types of ELB services: Classic Load Balancer, Application Load Balancer, and Network Load Balancer

• Classic Load Balancer is used for distributing traffic across EC2 instances, while Application Load Balancer is used for routing HTTP/HTTPS traffic to different target...read more

Github basic commands and their usecases

• git clone : clones a repository to local machine

• git add : adds a file to staging area

• git commit -m : commits changes to local repository

• git push: pushes changes to remote repository

• git pull: fetches and merges changes from remote repository

• git branch: lists all branches in the repository

• git checkout : switches to a different...read more

To maintain maximum availability of databases in AWS, we can use various methods such as Multi-AZ deployment, Read Replicas, and Elastic Load Balancing.

• Multi-AZ deployment ensures that a standby replica of the primary database is always available in a different availability zone.

• Read Replicas can be used to offload read traffic from the primary database and improve performance.

• Elastic Load Balancing can distribute traf...read more

Create a plan to troubleshoot and resolve the issue as quickly as possible.

• Identify the root cause of the failure

• Check AWS service health dashboard for any known issues

• Check CloudWatch logs for error messages

• Rollback changes if necessary

• Restore from backups if data is lost

• Implement preventive measures to avoid similar issues in the future

AWS provides various monitoring services to monitor resources and applications.

• CloudWatch is a monitoring service for AWS resources and applications

• CloudTrail provides event history of AWS account activity

• AWS Config provides inventory of resources and configuration history

• Trusted Advisor provides best practices and recommendations

• X-Ray helps debug and analyze distributed applications

Route53 is a DNS web service provided by AWS that routes internet traffic to the appropriate resources.

• Route53 is used for domain registration, DNS routing, and health checking of resources

• It can be used to route traffic to EC2 instances, S3 buckets, and load balancers

• Route53 also supports routing policies such as weighted, latency-based, and geolocation-based routing

Code to separate userid and domain in email

• Use the split() method to split the email address at the '@' symbol

• The first part of the split result is the userid, and the second part is the domain

• Handle cases where there are multiple '@' symbols in the email address

Code to check for absence of a specific pattern in strings

• Use regular expressions to define the pattern to be avoided

• Use the 'not' operator to check if the pattern is absent in the string

• Implement the code in the language of your choice

Beanstalk uses Elastic Load Balancer (ELB) instead of creating its own load balancer.

• Beanstalk is a platform as a service (PaaS) that automates the deployment of applications.

• It uses Elastic Load Balancer (ELB) to distribute traffic to instances.

• ELB provides more features and flexibility than a custom load balancer.

• Beanstalk also supports other load balancers like Application Load Balancer (ALB) and Network Load Balanc

A service in ECS is a group of tasks that are defined to run together. A task is a set of container instances.

• A service is used to define the desired state of a task and maintain it

• A task is a set of container instances that run together on a single EC2 instance or across multiple instances

• Services can be scaled up or down based on demand

• Tasks can be defined using task definitions which specify the container images, po...read more

Additional security can be added in ECS by implementing security groups, IAM roles, and VPCs.

• Implement security groups to control inbound and outbound traffic

• Use IAM roles to manage access to AWS resources

• Create VPCs to isolate resources and control network traffic

• Enable encryption for data at rest and in transit

• Implement multi-factor authentication for user access

AWS networking architecture is based on Virtual Private Cloud (VPC) which allows users to create isolated virtual networks.

• VPC allows users to create subnets, route tables, and network gateways

• Security groups and network access control lists (ACLs) can be used to control traffic flow

• AWS Direct Connect and VPN can be used to connect on-premises networks to VPC

• Elastic Load Balancing and Amazon Route 53 can be used for lo

NLB and ALB are both ELBs but differ in their routing capabilities.

• NLB routes traffic based on IP addresses and ports, while ALB routes traffic based on HTTP/HTTPS requests.

• NLB is better suited for TCP/UDP traffic, while ALB is better suited for HTTP/HTTPS traffic.

• ALB supports advanced routing features like path-based routing and host-based routing.

• NLB is more performant and can handle higher traffic loads than ALB.

• Bot...read more

Packages in Lambda are libraries or modules that can be used to extend the functionality of the code. Environment variables are used to store sensitive data.

• Packages can be installed using pip or uploaded as a zip file

• Environment variables can be set in the Lambda console or using AWS CLI

• They can be accessed in the code using os.environ['variable_name']

• Examples of sensitive data that can be stored in env variables are

I joined cometchat because of its innovative approach to communication and its strong reputation in the industry.

• Cometchat offers cutting-edge technology and solutions for real-time communication.

• The company has a proven track record of success and a strong reputation in the industry.

• I was impressed by the company's commitment to innovation and staying ahead of the curve.

• Cometchat provides a collaborative and dynamic w...read more

DevOps engineers are responsible for bridging the gap between development and operations teams.

• Automating deployment processes

• Monitoring system performance

• Collaborating with development and operations teams

• Ensuring system security and reliability

• Implementing continuous integration and delivery

• Managing infrastructure and configuration

• Troubleshooting issues and providing solutions