Solera Senior Devops Engineer Interview Questions and Answers

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.

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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Data Structure related questions

Q1. Java related interview questions
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Simple coding test - DSA questions. Questions on JS

Q1. JS Concepts - Closures, Promise
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Q1. Regarding js coding
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Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
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Q2. How to serialize and deserialise a tree
Ans. 
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
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Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
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Q4. Explain about throttling and implement throttle function.
Ans. 
Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
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Q1. Find squares of elements in a sorted array and return the sorted response.
Ans. 
Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
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Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
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Q3. Explain event loop, what are different types of queues in event loop
Ans. 
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
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Q4. What is virtual DOM and why its faster
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
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Q1. Presented me with an existing code containing the unit tests and actual code in python and asked me to debug and fix all the issues in code so that all unit test cases will pass
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Q1. Its an architecuture/desing round, interviewed asked me about the architecture of one of service i have created in my previous company then he cross questioned on the architecture. Then he asked me if I w...read more
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Q1. Its managerial round, the manager asked about my mentor skills like tell me cases where you have confilct with your mentees or lead or manager.
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