Answer:- SSH is nothing but a secure shell that allows users to login with a secure and encrypted mechanism into remote computers. It is used for encrypted communications between two hosts on an unsafe network. It supports tunneling, forwarding TCP, and also transferring files.

Answer:- NRPE stands for ‘Nagios Remote Plugin Executor’. As the name suggests, it allows you to execute Nagios plugins remotely on other Linux or Unix machines. It can be helpful in monitoring remote machine performance metrics such as disk usage, CPU load, etc. It can communicate with some of the Windows agent addons. We can execute scripts and check metrics on remote Windows machines as well.

Answer:- • To plan for infrastructure upgrades before the outdated systems fail • To respond to issues quickly • To fix problems automatically when detected • To coordinate with the responses from the technical team • To ensure that the organization’s service-level agreements with the clients are being met • To make sure that the IT infrastructure outages have only a minimal effect on the organization’s net income • To monitor the entire infrastructure and business processes

Answer:- Nagios Log Server simplifies the process of searching the log data. Nagios Log Server is the best choice to perform tasks such as setting up alerts, notifying when potential threats arise, simply querying the log data, and quickly auditing any system. With Nagios Log Server, we can get all of our log data in one location with high availability.

Answer:- Nagios can provide us the complete monitoring service for our HTTP servers and protocols. Here are a few benefits of implementing effective HTTP monitoring with Nagios: • Server, services, and application availability can be increased. • Network outages and protocol failures can be detected quickly. • User experience can be monitored. • Web server performance can be monitored. • Web transactions can be monitored. • URLs can be monitored.

Answer:- Namespaces are a way to divide cluster resources between multiple users in Kubernetes. In other words, it is useful when multiple teams or users are using the same cluster which can lead to potential name collision.

Answer:- By definition, kubectl is a command-line interface for running commands against Kubernetes clusters. Here, ‘ctl’ stands for ‘control’. This ‘kubectl’ command-line interface can be used to deploy applications, inspect and manage cluster resources, and view logs.

Answer:- Selenium supports regression testing and functional testing.

Answer:- To install Ansible 2.8 on Linux, Security-Enhanced Linux (SELinux) has to be enabled and Python 3 has to be installed on remote nodes.

Answer:- The major advantages of configuration management are given below: • It enables us to manage the configurations on multiple systems. • It allows us to standardize the configurations on all systems in a cluster. • It helps us in the administration and management of multiple servers in the architecture.

Answer:- AWS in DevOps works as a cloud provider, and it has the following role in DevOps: • Flexible services: AWS provides us with ready-to-use resources for implementation. • Scaling purpose: We can deploy thousands of machines on AWS, depending on the requirement. • Automation: AWS helps us automate tasks using various services. • Security: Using its security options (IAM), we can secure our deployments and builds.

Answer:- In Maven, we define all dependencies inside pom.xml so that all the dependencies will be downloaded and can be used within the project.

Answer:- • VCS allows developers to merge the changes that are made in the same version. • It allows them to share files easily between multiple computers. • The complete history of the project is visible to all the developers so that they can use the previous version if there is any breakdown. • All the versions are packed up so that they can easily re-use them.

Answer:- Following are the different components of Selenium: • Selenium Integrated Development Environment (IDE) – The Selenium IDE consists of a simple framework and comes with a Firefox plug-in that can be easily installed. This Selenium component should be used for prototyping. • Selenium Remote Control (RC) – It is a testing framework for developers and QA that supports coding in any programming language like Java, PHP, C#, Perl, etc. This helps automate the UI testing process of web applications against any HTTP website. • Selenium WebDriver – It has a better approach to automating the testing process of web-based applications and does not rely on JavaScript. This web framework allows cross-browser tests to be performed. • Selenium Grid – This proxy server works with Selenium RC and with the help of browsers, it is able to run parallel tests on different nodes or machines.