Shivakumar – Best DevOps

Assignment 8 DataDog

Shivakumar — Sun, 11 Dec 2022 13:45:07 +0000

1) What is Datadog Agent?
ans. The Datadog Agent is software that runs on your hosts. It collects events and metrics from hosts and sends them to Datadog, where you can analyze your monitoring and performance data.
3)Top 10 commands of Datadog Agent
ans. Start the Agent – systemctl start datadog-agent
Stop the Agent – systemctl stop datadog-agent
Restart the Agent – systemctl restart datadog-agent
Status of the agent systemctl status datadog-agent
Print all configurations – datadog-agent configcheck
Runtime configuration – datadog-agent config
Print the ggent health – datadog-agent health
Print the hostname of Agent – datadog-agent hostname
Print version – datadog-agent version
Help about any command – datadog-agent help
4) Locate how to enable Logs monitoring in datadog.yaml?
ans. To enable log collection with an Agent running on your host, change logs_enabled: false to logs_enabled: true in the Agent’s main configuration file (datadog.yaml).
5) Top 10 Techniques for troubleshooting Datadog Agent
ans. Is your Agent container stopping right after starting? It can be a hostname detection issue.
Is your host connected to the internet or able to access it through a proxy?
If using a proxy: is your Agent configured for this proxy?
Is the Datadog API key set up in your datadog.yaml configuration file the API key corresponding to your Datadog platform?
Is the site configured in your datadog.yaml configuration file matching the one from your organization?
Is there only one Datadog Agent running on your host?
Did you restart the Datadog Agent after editing a yaml configuration file?

Assignment 7 GIT

Shivakumar — Wed, 16 Nov 2022 15:44:58 +0000

What are differences between the git distributed model and svn server-client model
Ans: Git is a distributed version control system known for its speed, workflow compatibility, and open source foundation. With Git, software teams can experiment without fearing that they’ll create lasting damage to the source code. Teams using a Git repository can tackle projects of any size with efficiency and speed.
Subversion (SVN) is a free, open source version control system that operates according to the client/server model. An SVN server is usually installed on a central computer and it manages the data of the SVN repository in a database.
Explain the use of Git Workspace – Staging – Repository area in detail with few use cases
Ans: A workspace is simply a set of git repositories. They are listed in the “Repos” tab in a main window’s left pane. You can have several different sets of repositories, each one stored in a different workspace file.
One of the core functions of Git is the concepts of the Staging Environment, and the Commit. As you are working, you may be adding, editing and removing files. But whenever you hit a milestone or finish a part of the work, you should add the files to a Staging Environment.
A Git repository tracks and saves the history of all changes made to the files in a Git project. It saves this data in a directory called . git , also known as the repository folder. Git uses a version control system to track all changes made to the project and save them in the repository.
Write down the Types of git branch and use cases of it
Ans: feature: The Git Feature Branch Workflow is a composable workflow that can be leveraged by other high-level Git workflows
Release: Automatically generated release notes provide an automated alternative to manually writing release notes for your GitHub releases.
Maintenance or “hotfix” branches are used to quickly patch production releases.
Hotfix: Hotfix branches are a lot like release branches and feature branches except they’re based on main instead of develop
Explain the Types of Merging and use cases of it.
Ans: There are two main ways Git will merge: Fast Forward and Three way
A Git fast forward is an extremely useful and efficient mechanism for harmonizing your project’s main branch with changes introduced in a given feature branch. Git makes ample use of fast-forwarding merges behind the scenes, speeding up your development workflow in the process.
the Merge Commit is based on 3 different commits. The common ancestor of our branches, in this case commit number C3. This commit contains code before we diverge into different branches.
Create a Table with Top 20 Git commands along with one line explanations like self cheatsheet.
Ans: git config :This command sets the author name and email address respectively to be used with your commits.
git init :This command is used to start a new repository.
git clone:This command is used to obtain a repository from an existing URL.
git add: This command adds a file to the staging area.
git commit: This command records or snapshots the file permanently in the version history.
git diff: This command shows the file differences which are not yet staged.
git reset: This command unstages the file, but it preserves the file contents.
git status:This command lists all the files that have to be committed.
git rm: This command deletes the file from your working directory and stages the deletion.
git log:This command is used to list the version history for the current branch.
git show: This command shows the metadata and content changes of the specified commit.
git tag: This command is used to give tags to the specified commit.
git branch: This command lists all the local branches in the current repository.
git checkout: This command is used to switch from one branch to another.
git merge: This command merges the specified branch’s history into the current branch.
git remote: This command is used to connect your local repository to the remote server.
git push: This command sends the committed changes of master branch to your remote repository.
git pull: This command fetches and merges changes on the remote server to your working directory.
git stash: This command temporarily stores all the modified tracked files

Assignment 6 Confluence

Shivakumar — Thu, 10 Nov 2022 14:07:45 +0000

What are top 5 use cases of Confluence?
ans: Writing product requirements
Build a release planning page
Create customer interview pages
Create sprint retrospective and demo pages
Make better development decisions
What is Space Vs Blogs Vs Pages
ans: Pages are great for when you want the information to last and evolve over time. If it’s a point-in-time update or one-time communication then a blog post is the way to go. These aren’t hard-and-fast rules; they’re just pointers to give you a place to start.Spaces are Confluence’s way of organizing content into meaningful categories.
List out Top 20 Macros of Confluence with one short intro
ans: Advanced Roadmaps Macro
Anchor Macro
Attachments Macro
Blog Posts Macro
Change History Macro
Chart Macro
Cheese Macro
Children Display Macro
Code Block Macro
Column Macro
Content by Label Macro
Content by User Macro
Content Report Table Macro
Contributors Macro
Contributors Summary Macro
Create from Template Macro
Create Space Button Macro
Excerpt Include Macro
Excerpt Macro
Expand Macro
Favorite Pages Macro
Gadget Macro
Gallery Macro

assignment 5 jira

Shivakumar — Wed, 09 Nov 2022 15:01:41 +0000

What are top 10 use cases of Jira and give short explanations of each use cases
ans: Issue tracking
Customizable workflows
Estimation & work logging
Progress reporting
Scrum boards
Kanban boards
Project-level permissions
Project backlogs
Email notifications
Roadmaps
Write down step by step process of adding custom fields in Jira issue with screenshot attached of each step
ans: Select settings > Issues.
Under FIELDS, select Custom fields.
Click Create custom field. Make sure to select All to view the available field options.
Select the type of field you want to create and click Next. See a list and descriptions for the available custom field types in company-managed projects.
Add the details for your field.
The name you select appears as the custom field’s title wherever the field appears. The description appears below the field when creating and editing issues, but not when browsing issues.
When you have entered the field details, select Create.
Add the new custom field to one or multiple screens by ticking the corresponding box and click Update.
Write down step by step process of adding New workflow in Jira with screenshot attached of each step
ans: Choose Projects and select a starred or recent project, or choose View all projects and select a project.
From your project’s sidebar, select Project settings > Workflows.
Click the edit pencil to the right of the workflow.
Do either or both of the following:
Click Add status to add a new step to the workflow (you can add existing statuses or create new ones)
Click Add transition or drag from a node on one status to another to add a transition
Click Publish Draft.
List of Top 10 tasks to be done by Jira Administrator
ans: Setting up Jira
Configuring User Permissions
Optimizing Workflows
Prioritize Security
Avoid Unnecessary Workflows
Align Jira with Business Goals

Assigenment 4 AWS

Shivakumar — Sun, 06 Nov 2022 14:18:17 +0000

What is the difference between Network firewall & Os level firewall?
ans: Network firewalls are security devices used to stop or mitigate unauthorized access to private networks connected to the Internet, especially intranets. An OS firewall can apply much finer grained protection. It can enforce policies which are enacted per APPLICATION rather than just on observed address tupls.
What are the type of pvt key?
ans: Private IP address of a system is the IP address that is used to communicate within the same network. Using private IP data or information can be sent or received within the same network.
Public IP address of a system is the IP address that is used to communicate outside the network. A public IP address is basically assigned by the ISP (Internet Service Provider).
What is Region and Availability zone?
ans: AWS Regions are large and widely dispersed into separate geographic locations. Availability Zones are distinct locations within an AWS Region that are engineered to be isolated from failures in other Availability Zones.
What are the types of Storage and use case of it?
ans: There are three main cloud storage types: object storage, file storage, and block storage
What is Policy and Permission in IAM?
ans: An allow policy is a collection of role bindings and metadata. A role binding specifies what access should be granted to a resource. It associates, or binds, one or more principals with a single IAM role and any context-specific conditions that change how and when the role is granted.
Permissions let you specify access to AWS resources. Permissions are granted to IAM entities (users, groups, and roles) and by default these entities start with no permissions.
Write down and understanding of a concept of network, subnet, network firewall, internet gateway, route table?
ans: route table—The route table that automatically comes with your VPC. It controls the routing for all subnets that are not explicitly associated with any other route table.
A subnet, or subnetwork, is a segmented piece of a larger network. More specifically, subnets are a logical partition of an IP network into multiple, smaller network segments.
A computer that sits between different networks or applications. The gateway converts information, data or other communications from one protocol or format to another.
Explain a top 5 DNS records and their use cases in DNS server
ans: ddress Mapping record (A Record)—also known as a DNS host record, stores a hostname and its corresponding IPv4 address.
IP Version 6 Address record (AAAA Record)—stores a hostname and its corresponding IPv6 address.
Mail exchanger record (MX Record)—specifies an SMTP email server for the domain, used to route outgoing emails to an email server.
Certificate record (CERT Record)—stores encryption certificates—PKIX, SPKI, PGP, and so on.
Service Location (SRV Record)—a service location record, like MX but for other communication protocols.

Assigenment-3 Docker

Shivakumar — Sat, 05 Nov 2022 13:30:31 +0000

Components of Docker and its Brief Summary
ans: The Docker components are divided into two categories; basic and advanced.
basic docker components:
Docker Client: it allows user to communicate with docker.
Docker Image: Docker images are used to build containers and hold the entire metadata that elaborates the capabilities of the container.
Docker Daemon: It runs as a background process that manages parts like Docker networks, storage volumes, containers, and images.
Docker Container: A Docker container is the instance of an image that can be created, started, moved, or deleted through a Docker API
Docker Advanced Components:
Docker Compose: Sometimes you want to run multiple containers but as a single service. This task can be accomplished with the help of Docker compose as it is specifically designed for this goal.
Docker Swarm: If developers and IT admins decide to create or manage a cluster of swarm nodes in the Docker platform, they can use the Docker swarm service.
What is the differenet between docker pause and unpause?
ans: The Docker pause command is used to pause an existing Docker container. To unpause the container, we use “docker unpause” command.
What is the differenet between docker stop and kill?
ans: The docker kill subcommand kills one or more containers. The docker stop command attempts to stop a running container first by sending a SIGTERM signal to the root process (PID 1) in the container.
What is the differenet between docker exec and attach?
ans: docker exec executes a new command . Use docker attach to attach your terminal’s standard input, output, and error to a running container using the container’s ID or name.
List of dockerfile instructions and its Brief Summary?
ans: FROM – to pull base images like alpine, ubuntu,etc..
ADD – add the files to the images(ADD supports remote urls(not encourged to use) and automaticalls unzips tar balls
RUN – executes durint the image creation like RUN apk add wget
COPY – copy the files to images
EXPOSE – expose the port of the container
ENRTYPOINT[“java”,”jar”,”webappp.jar”] start the process you want to run after staring the container]
CMD – to pass on defaults for for an container.the paramenters for entry point can be passed using CMD.
What is the differenet between CMD vs Entrypoint
ans: CMD – The CMD describes the default container parameters or commands. The user can easily override the default command when you use this. ENTRYPOINT – A container with an ENTRYPOINT is preferred when you want to define an executable. You can only override it if you use the –entrypoint flag.
List of 20 docker commands and its use cases with example?
ans: docker –versionThis command is used to get the currently installed version of docker
docker pull : This command is used to pull images from the docker repository(hub.docker.com)
This command is used to create a container from an image
docker ps: This command is used to list the running containers
docker ps -a:This command is used to show all the running and exited containers
docker exec: This command is used to access the running container
docker stop: This command stops a running container
docker kill: This command kills the container by stopping its execution immediately.
docker commit: This command creates a new image of an edited container on the local system
docker login: This command is used to login to the docker hub repository
docker push: This command is used to push an image to the docker hub repository
docker images: This command lists all the locally stored docker images
docker rm: This command is used to delete a stopped container
docker rmi: This command is used to delete an image from local storage
docker build: This command is used to build an image from a specified docker file

LINUX Assigenment-2

Shivakumar — Thu, 22 Sep 2022 18:55:35 +0000

1) What is EPEL and Write a instructions to install and use it.
Ans : extra packages for enterprise Linux its a special intrest group from the fedora project that provides a set of additional package for rhelfrom the fedora resources. it creates, maintains and manages a high quality set of additional packages for enterprise Linux including red hat enterprise linux, cent os, scientific Linux, oracle Linux, almalinux and rocky Linux
steps to install
step 1: login to a host called server 1 using ssh client
step 2: install epel repository using – yum install epel-release-y
step 3: refresh epel repository by typing – yum repo list
step 4: install packages from epel repo – yum install pkg1

2) What is difference between hypervisor and cloud?
Ans: hypervisor is a software that creates and runs virtual machine. it can create simulated environment from one hardware system.
cloud is method of accessing the resources over the internet.it depends on multiple system so it helps in disaster recovery
3) What are the Network Adaptor(Driver) you have in VirtualBox and write a use case of it?
Ans: 1. not attached – network card present without connection mode
2. NAT-network address translation- to accesses web, mails, download as a guest with limitations
3. NAT network- for the purpose of internal network with outbound connections
4. bridge adapter- for advanced networking needs like simulating network and running server as a guest exchanging network packets directly
5. internal network- used to create software based network which is visible only to selected virtual machines
6. host only adapter – used to create network path for selected host’s virtual machine
7. Generic driver -This network mode allows you to share the generic network interface. A user can select the appropriate driver to be distributed in an extension pack or be included with VirtualBox.
4) Find a list 10 commands and write 10 example of it
Ans: 1.grep – used to search a pattern or keyword
2.find – used to find the files and perform operations on it
3. xargs – used to build and execute commands from common input
4. sed- stream editor can be used to perform search, replace, insert, delete operations
5. chmod- change mode- used to change the access mode of a file
6. Netstat- Netstat command displays various network related information such as network connections, routing tables, interface statistics, masquerade connections, multicast memberships etc.,
7. route- used when we want to work with the ip kernal routing table
8. record-
9. vmstat- virtual memory static reporter -performance monitoring of the system command for
10. visudo- it edits the sudoers file which is used by the sudo command
11. Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling and allows the user to use variables, numeric functions, string functions, and logical operators.

Assigenment-1

Shivakumar — Sun, 18 Sep 2022 04:57:05 +0000

What is DevOps in simple terms?
Ans: devops is a combination of all the teams such as development, testing, architecture where all work on common goal or to solve a problem and reduce the time of delivery and to maintain the software quality
What exactly do DevOps do?
Ans: reduces the time of delivery and improves the quality of the software product by automating the processes. it combines all the teams like development, testing, architecture to work on the goal or problem, coordinating with each other
What are the list of DevOps Tools?
Ans: Linux, kubernets, doker, jenkins, aws, git, ansiable
How DevOps and SRE are different?
Ans: Devops is to handle the runtime errors by automating the processes of delivery. SRE is approach to have system reliability, availability, stability by managing the errors
What is Develops?
Ans: Development, security, Operations. it automatically breaks into the security at every phase enabling the development of secure software