Oracle Senior Devops Engineer Interview Questions, Process, and Tips

Q1. What is ipconf.pl?
Ans. 
ipconf.pl is a Perl script used for configuring network interfaces on Linux systems.
• ipconf.pl is typically used to set up IP addresses, netmasks, gateways, and DNS servers on Linux machines.

• It can be used to automate the configuration of network interfaces during system setup or maintenance.

• The script may also be used to troubleshoot network connectivity issues by checking and modifying network settings.

• ipconf.pl is of...read more
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Q2. What is the difference between scan vip & node vip?
Ans. 
Scan VIP is used for load balancing traffic to multiple nodes, while Node VIP is assigned to a specific node for direct access.
• Scan VIP is a virtual IP address used for load balancing traffic across multiple nodes in a cluster.

• Node VIP is a virtual IP address assigned to a specific node in the cluster for direct access.

• Scan VIP is typically used for services that need to be highly available and distributed across multi...read more
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Q1. What is quarantile in Exadata?
Ans. 
Quarantile in Exadata is a feature that isolates problematic cells to prevent them from affecting the rest of the system.
• Quarantile is a feature in Exadata that identifies and isolates cells that are experiencing issues or failures.

• It helps prevent the spread of issues to other cells in the system, ensuring high availability and performance.

• Quarantiled cells are still accessible for diagnosis and maintenance, but are n...read more
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Q2. How to identify the master switch in Exadata?
Ans. 
The master switch in Exadata can be identified by checking the status of the cell server software.
• Check the status of the cell server software using the 'cellcli' command

• The cell server with the 'MS' role is the master switch

• The master switch can also be identified by checking the 'cellinit.ora' file
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Q3. What is spine switch & leaf switch in exadata?
Ans. 
Spine switch and leaf switch are networking components in Exadata used for connecting database servers and storage servers.
• Spine switch acts as the core of the network, connecting all leaf switches and providing high-speed connectivity.

• Leaf switches connect database servers and storage servers to the spine switch, facilitating communication between them.

• Exadata uses a leaf-spine network architecture for efficient data ...read more
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One of the node of a 3 node cluster is down. Explain the step by step process to troubleshoot the issue.

Shell script & terraform code output was asked.

Q1. K8s fundamentals. Role of each component
Ans. 
Kubernetes (k8s) fundamentals and role of each component
• Kubelet - agent that runs on each node in the cluster and ensures containers are running

• Kube-proxy - network proxy that maintains network rules on nodes

• Kubernetes API server - central management entity that serves the Kubernetes API

• etcd - distributed key-value store used for storing cluster data

• Kube-controller-manager - runs controller processes to manage the stat...read more
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Q2. How can one troubleshoot the crashloop error in Kubernetes (k8s)?
Ans. 
Troubleshooting crashloop error in Kubernetes involves checking pod logs, examining resource limits, and verifying configuration files.
• Check pod logs to identify the cause of the crashloop.

• Examine resource limits to ensure the pod has enough resources to run.

• Verify configuration files for any errors or misconfigurations.

• Use kubectl commands like describe, logs, and exec to troubleshoot further.

• Consider checking for iss...read more
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1. Log parsing using python

Q1. What are inodes?
Ans. 
Inodes are data structures in Unix-like file systems that store metadata about files, such as permissions, ownership, and location.
• Inodes contain information about files, such as file size, permissions, timestamps, and pointers to data blocks.

• Each file in a Unix-like file system is represented by an inode.

• Inodes are used to efficiently locate and manage files on the file system.

• When a file is created, an inode is also ...read more
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Q2. How do you list all the files held by a process
Ans. 
Use the lsof command to list all files held by a process
• Use the lsof command followed by the -p flag and the process ID to list files held by a specific process

• For example, to list all files held by process ID 1234, run: lsof -p 1234

• You can also use the -c flag to specify a process name instead of ID, like: lsof -c chrome
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Q3. Container vs Virtaul Machines?
Ans. 
Containers are lightweight, portable, and efficient, while virtual machines are more isolated and resource-intensive.
• Containers share the host OS kernel, making them more lightweight and faster to start compared to VMs.

• VMs provide stronger isolation and security by running a separate OS instance for each VM.

• Containers are ideal for microservices architecture and rapid deployment, while VMs are better for running multip...read more
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DSA, Hashmaps, Arrays and String Manipulation

Q1. What are terraform modules
Ans. 
Terraform modules are reusable components that can be used to create infrastructure resources.
• Modules are collections of .tf files that define resources and their dependencies

• They can be used to create reusable infrastructure code

• Modules can be published to the Terraform Registry for others to use

• They can be used to create complex infrastructure setups easily
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