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What is Kubernetes
Kubernetes is an open-source container management tool which includes container deployment, scaling & descaling of containers & load balancing which is managed on the clustered environment. In other words, we can say that the main aim of Kubernetes is to provide a better platform for automating deployment, and operations of application containers across clusters of hosts. Using Kubernetes for your business will help your application workflow to go modernized/smooth and also accelerate better developer velocity.
Security and Compliance
Kubernetes comes with high security and also with highly secured servers. And it has got both HIPAA and PCI DSS 3.1 Compliance.
Quickly and automatically scale your application deployment (RAM, CPU, Disk space, etc) up and down as per your requirements.
Quick Consistent Builds
We using HostingRaja Container Builder to deploy your containers on Kubernetes cluster with better setup authentication.
Kubernetes uses the hybrid networking system and enables rapid application development by having a reserve IP address for your cluster and allowing your cluster IPs to synchronize with a private network.
Kubernetes clusters are fully managed with better security and it is also managed by HostingRaja Dedicated Support team and ensuring better availability and also up-to-date.
Stateful Application Support
Get better Stateful application support where you can attach and have determined storage to your containers and also host the complete databases.
What is a Kubernetes Service?
Kubernetes Services is a service that consists of a grouping of pods which are running on the cluster. It is also a concept which defines a logical set of Pods. And in Kubernete services, the set of Pods which are targeted by a Service is normally determined by a Label Selector. Moreover, Kubernetes services can efficiently power a microservice architecture.
Kubernetes is portable and also a popular open-source platform for managing containerized workloads and services where it helps both declarative configuration and automation. In Kubernetes it supports a lot of application services which is simple Endpoints API which can be updated whenever the set of Pods in a Service changes. Kubernetes services, support, and tools are widely available.
Virtual IPs and service proxies
In Kubernetes cluster every node will run a Kube-proxy which is responsible for performing a form of virtual IP for services other than ExternalName. With each new release of Kubernetes version, there are different layers where new features are added. With the latest version of Kubernetes that is after Kubernetes v1.1, you get iptables proxy. And in iptables, you no need to switch back between userspace and kernel space and it is faster and more reliable than the userspace proxy.
Choosing Your Own IP Address
Choose your own cluster IP address as part of a service creation request. So to do this you need to set the .spec.clusterIP field in your Kubernetes cluster. And if you already have a DNS entry and if you wish to replace it then it is difficult to re-configure. You also need to see that you need to choose a valid IP address that is within the service-cluster-IP-range CIDR range which is a flag to the API server.
Our Kubernetes supports 2 main services that are environment variables and DNS. In environment variables when a pod is running on a node the kubelet adds will set of the environment variables from active service. And in it - it supports both Docker links compatible variables and simpler variables. In DNS server an optional cluster is added on. In DNS service a DNS server will watch the Kubernetes API for newly created service and performs a set of DNS records for each.
If you need many services on the Kubernetes cluster then you need to have more than one port. So with our Kubernetes service, it supports multiple ports which are definitions on a Service object. And while using the multiple ports you need to give all of your ports names so that endpoints can be rephrase.
The Glory Details of Virtual IPs
In Kubernetes it will avoid collisions or crashes. Because one of the basic perspectives of Kubernetes is that users should not be presented to circumstances that could make their actions to fail through no fault of their own. In this scenario, it will be because of network ports. Because sometimes users will choose a port number so in that case there is a chance to collide with another user. To overcome this issue you need to allocate each server with its own IP address.
Depending upon your requirements of load-balancing and a single service IP you can easily create a headless service by specifying "None" for your Kubernetes cluster IP. This will reduce the coupling to the Kubernetes system and allow your developers to have the better freedom to design. Moreover, you can easily build an application on API which uses self-registration pattern and other discovery systems.
If you want to expose some of your application onto an external cluster IP address then in Kubernetes Service it allows you to do so. Over there you can also specify what kind of service that you want. You can choose the service type that you want to use here are some of the services that you can use- ClusterIP, NodePort, LoadBalancer, ExternalName. You can also use the PROXY protocol support on HostingRaja, ELB Access Logs on HostingRaja, and Other ELB annotations with our Kubernetes services.
If you want to use userspace proxy for VIPs then it will work only on the medium scale but if you want to use it with large cluster then it is not possible. And using the userspace proxy will cover the source IP of a container accessing a Service. This will give you a strong firewall. Moreover, the iptables proxier will not involve in-cluster source IPs but sometimes it will still impact clients coming through a load-balancer or node-port. This type field is designed as nested functionality where each level adds to the previous.