Provakil Technologies Devops Engineer Interview Questions and Answers

The VPN port used for UDP is typically 500.

• The VPN port used for UDP is usually port 500.

• UDP is a protocol that allows for faster transmission of data but does not guarantee delivery or order of packets.

• Port 500 is commonly used for IPsec VPNs, which provide secure communication over the internet.

• Other VPN protocols may use different ports for UDP, so it's important to check the specific configuration.

A Go program to find the number furthest from zero in an array, considering both positive and negative values.

• Iterate through the array of integers.

• Keep track of the number with the maximum absolute value.

• Return the number that is furthest from zero.

• Example: For [-4, 2, 24, 55, -89, 12], the output should be -89.

Syntax for grep command and regex

• grep [options] pattern [file]

• Regular expression (regex) is used to define the pattern

• Examples: grep 'hello' file.txt

• grep -i 'hello' file.txt

• grep -r 'hello' /path/to/directory

You can use the Docker API to remotely run Docker commands on a Linux server without taking a separate SSH session.

• Use the Docker API to interact with the Docker daemon on the remote Linux server.

• Make sure Docker is installed and running on both your laptop and the remote server.

• Authenticate with the remote server using appropriate credentials.

• Establish a connection to the Docker daemon on the remote server using the D...read more

Terraform, Packer, and Puppet are tools used in DevOps for infrastructure automation and configuration management.

• Terraform is used for infrastructure as code and automates the provisioning of infrastructure resources.

• Packer is used for creating machine images for multiple platforms from a single source configuration.

• Puppet is used for configuration management and automates the deployment and management of software and...read more

SG is stateful and operates at instance level, NACL is stateless and operates at subnet level.

• SG is a firewall that controls inbound and outbound traffic for an instance.

• SG is stateful, which means it tracks the state of connections and allows return traffic.

• NACL is a firewall that controls traffic in and out of a subnet.

• NACL is stateless, which means it does not track the state of connections.

• NACL rules are evaluated ...read more

CloudWatch is for monitoring while CloudTrail is for auditing.

• CloudWatch is used to monitor AWS resources and applications in real-time.

• CloudTrail is used to log and audit AWS account activity and API calls.

• CloudWatch can be used to set alarms and trigger actions based on metrics.

• CloudTrail can be used to track changes to resources and troubleshoot issues.

• Both services can be used together to provide a comprehensive mo...read more

Yes, it is possible to attach multiple instances to a single EBS volume.

• This is achieved by using Amazon EBS Multi-Attach feature.

• It allows multiple EC2 instances to attach to a single EBS volume simultaneously.

• This feature is useful for applications that require high availability and shared access to data.

• However, not all EC2 instance types support multi-attach.

• It is important to ensure that the application is designe...read more