Interview Questions and Answers

Apache normal restart stops and starts the server, while graceful restart allows current connections to finish before restarting.

• Normal restart stops and starts the server immediately, causing all active connections to be terminated.

• Graceful restart allows the server to continue serving current connections until they are finished, then starts a new instance of the server.

• Graceful restart is useful for minimizing downtime and avoiding disruption to users.

• Normal restart is fast...read more

Reload refers to reloading the configuration without restarting the service, while restart refers to stopping and starting the service.

• Reload is a process of reloading the configuration of a service without stopping it completely.

• Restart is a process of stopping and starting the service completely.

• Reload is faster than restart as it does not require the service to be completely stopped.

• Reload is useful when making minor changes to the configuration, while restart is required ...read more

Implemented CICD process using Jenkins, Git, Docker and Kubernetes.

• Used Jenkins for continuous integration and continuous delivery

• Git for version control and code management

• Docker for containerization and portability

• Kubernetes for container orchestration and scaling

• Implemented automated testing and deployment pipelines

• Enabled faster and more reliable software delivery

• Reduced manual errors and increased efficiency

Security groups are used to control inbound and outbound traffic for EC2 instances in AWS.

• Security groups act as virtual firewalls for EC2 instances.

• They allow or deny traffic based on rules defined by the user.

• They can be assigned to multiple instances.

• They are stateful, meaning they keep track of the traffic flow and allow the response traffic.

• They can be used to restrict access to specific ports or IP addresses.

• They are a fundamental component of AWS security.

• Example: A se...read more

NAT stands for Network Address Translation. It is used to translate private IP addresses to public IP addresses.

• NAT is used to allow devices with private IP addresses to access the internet using a public IP address.

• It can be configured on a router or firewall.

• There are three types of NAT: static, dynamic, and port forwarding.

• Static NAT maps a private IP address to a public IP address permanently.

• Dynamic NAT maps a private IP address to a public IP address temporarily.

• Port fo...read more

We are using CIDR block 10.0.0.0/16 in our VPC.

• Our VPC is using the private IP address range of 10.0.0.0/16

• This CIDR block allows us to have up to 65,536 IP addresses

• We have divided the VPC into multiple subnets using smaller CIDR blocks