Kubernetes is an open source system for automating deployments, scaling and managing containerized applications.
We will first briefly look at some of the concepts in Kubernetes that you may come across doing the Hands-on.
There is something called Images where you find the executable package of your application that includes your code, libraries, conf files, runtime, environment variables, etc. By running these images we launch something called Containers. These containers run in a container cluster which is managed using Kubernetes.
A container cluster is nothing but a group of compute engine VM (Virtual Machine) instances. In a container cluster, there are two types of VM instances.
Thus, in the above diagram, there are four VM instances, for each node instance and master.
Master is the supervising machine. It manages the cluster. Kublet is used to communicate with the master. The pods contain containers. Inside each pod, there can be multiple containers running. All the containers inside a pod share the same underlying resources. That means they all have the same IP address, share the same disk volumes, etc. A service is a grouping of pods that are running on the cluster.
If you want to have more in-depth knowledge on Kubernetes, I would recommend you refer their docs.
For this practical, I will be using Ubuntu 18.04.1 and node.js
1.Sign in to your Google account. If you do not have one, sign up for a new account.
Install Google Cloud SDK.
sudo snap install kubectl --classic
Go to the Google Cloud Platform Console and create a new project.
Open the newly created project.
In the Navigation menu, click the APIs & Services and go to the Library page.
Search for Kubernetes Engine API and click Enable
Now let us create a cluster.
Go to the Navigation menu, select Kubernetes Engine -> Clusters.
Then you will be prompted to Create a Cluster. You can customize your cluster according to your needs, but for this project, I will be using all the default settings.
Click the create button, and wait till the cluster is created.
Configure kubectl command line access by running the following command:
gcloud container clusters get-credentials <cluster name> -- zone <zone name> --project <project ID> eg: gcloud container clusters get-credentials standard-cluster-service --zone us-central1-a --project k8s-api-service-project
Open the gcloud shell, and type
gcloud container clusters list
This will list out all the existing clusters for running containers. In our case, we have a cluster with three nodes.
a list of existing clusters for running containers
Now, in your local machine, open the terminal, go inside the folder where your application is at.
Create a text file named “Dockerfile” inside the folder you are now at.
Open the created text file and copy and paste the following commands, and save it.
FROM node:8 # Create app directory WORKDIR /usr/src/app # Install app dependencies # A wildcard is used to ensure both package.json AND package-lock.json are copied # where available (npm@5+) COPY package*.json ./ RUN npm install # If you are building your code for production # RUN npm ci --only=production # Bundle app source COPY . . CMD [ "npm", "start" ]
Dockerfile is a text file that has a series of instructions on how to build your image. It supports a simple set of commands that you need to use in your Dockerfile.>
<em>WORKDIR <path></em>: Sets the working directory for any
<em>ADD</em>instructions that follow it in the
<em>Dockerfile</em>. If the
<em>WORKDIR</em>doesn’t exist, it will be created even if it’s not used in any subsequent
<em>COPY <src>... <dest></em>: Copy new files or directories from
<em><src></em>and adds them to the filesystem of the container at the path
<em>RUN <command></em>: The command is run in a shell, which by default is
<em>/bin/sh -c</em>on Linux>
<em>CMD [“executable”,”param1",”param2"]</em>: Sets the command to be executed when running the image.
Similarly, create a “.dockerignore” file using
touch .dockerignoreand copy and paste the following commands.
In most cases, you’ll be copying in the source code of your application into a docker image. Typically you would do that by adding
<em>COPY src/ dest/</em>or similar to your
<em>Dockerfile</em>. That’s a great way to do it, but that’s also going to include things like your
<em>/tmp</em>folders that belong to your project, which you really do not need for building the docker image. Including such files will increase the docker image size unnecessarily.> We can exclude files and directories we do not need within our final image. All you have to do is create a
<em>.dockerignore</em>file alongside your
<em>Dockerfile</em>.> At this point, it’s pretty similar to what a
<em>.gitignore</em>file does for your git repos. You just need to tell it what you want to ignore.
Then, build the container image for the data service application.
docker image build -t <image repository name>:<tag name> . eg: docker image build -t dataserver:v2 .
Note the “dot” at the end of the line. It specifies the current working directoryyou are in. Here, it is the directory where you are running the ‘docker image build’ command from, which is also where your Dockerfile is at.
To see your built image, type
Now, let’s put this image to the Docker Hub. ( If you do not have an account at docker hub, first you need to sign up there)
Create a new repository. Mine would be “apiservice”
Now push the image we built into the docker hub
Log in to the Docker Hub from the terminal
Enter your username and password
Get your image ID by typing
Tag your image
docker image tag <image ID> <docker hub repository name>:<tag> eg: docker image tag 377026348163 varuni95/dataservice:v2
If you do not specify the tag, it will always default to “latest”.
Push your image
docker image push <docker hub repository name> eg: docker image push varuni95/dataservice
Now let’s pull our image and create a new container from it.
Go to the Gcloud shell,
kubectl run <container name> --image=<docker hub repository name>:<tag name> --port=<port number> eg: kubectl run data --image=varuni95/dataservice:v2 --port=3101
Now expose the Kubernetes deployment through a load balancer
kubectl expose deployment data --type=LoadBalancer
Get the external IP address
kubectl get svc
Copy that IP address ( 18.104.22.168), and paste it there as the request URL in your api_service application (go inside api_service>routes>states_hash.js. Do the same for api_service>routes>states_titlecase.js)
Now let’s follow the same steps as mentioned above to expose the api service
docker image build -t apiserver:v2 .
Go to the Docker Hub and create a new repository (eg: apiservice)
Get your image Id from
Tag your image
docker image tag c174a3d43afa varuni95/apiservice:v2
Push your image
docker image push varuni95/apiservice
Pull our image and run a new container in the cluster
kubectl run api --image=varuni95/apiservice:v2 --port=3100
Expose the deployment through a load balancer
kubectl expose deployment api --type=LoadBalancer
Get your external IP address
Now you should now be able to access the service by pointing your browser to this address:
Try out with different US state codes 😉
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Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend.
Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers.
Alongside prevalence, Node.js additionally acquired the fundamental JS benefits:
In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development).
In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based.
There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations).
Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.
Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while.
Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements.
Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility.
Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root.
What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations.
Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation.
In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.
So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development.
I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call.
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If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.
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Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.
Are you striving to develop an application using Node.js? But can’t decide which company to hire for NodeJS app development? Well! Don’t stress over it, as the following list of NodeJS app development companies is going to help you find the best partner.
Let’s take a glance at top NodeJS application development companies to hire developers in 2021 for developing a mind-blowing application solution.
Before enlisting companies, I would like to say that every company has a foundation on which they thrive. Their end goals, qualities, and excellence define their competence. Thus, I prepared this list by considering a number of aspects. While making this list, I have considered the following aspects:
I believe this list will help you out in choosing the best NodeJS service provider company. So, now let’s explore the top NodeJS developer companies to choose from in 2021.
JSGuru is a top-rated NodeJS app development company with an innovative team of dedicated NodeJS developers engaged in catering best-class UI/UX design, software products, and AWS professional services.
It is a team of one of the most talented developers to hire for all types of innovative solution development, including social media, dating, enterprise, and business-oriented solutions. The company has worked for years with a number of startups and launched a variety of products by collaborating with big-name corporations like T-systems.
If you want to hire NodeJS developers to secure an outstanding application, I would definitely suggest them. They serve in the area of eLearning, FinTech, eCommerce, Telecommunications, Mobile Device Management, and more.
Headquarters: Banja Luka, Bosnia, and Herzegovina
Price: Starting from $50/hour
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