What Is
Kubernetes.....
Running a container on a laptop is relatively simple. But, connecting containers across multiple hosts, scaling them, deploying applications without downtime, and service discovery among several aspects, can be difficult.
Kubernetes is the one which addresses those challenges from the start with a set of primitives and a
powerful open and extensible API. The ability to add new objects and
controllers allows easy customization for various production needs.
According to
the kubernetes.io website, Kubernetes is:
"an open-source system for automating
deployment, scaling, and management of containerized applications".
Kubernetes is that it builds on 15 years of experience at Google in a project
called borg. Kubernetes is
inspired by Borg - the internal system used by Google to manage its
applications (e.g. Gmail, Apps, GCE).
Methodology of
Kubernetes
Deploying
containers and using Kubernetes may require a change in the development and the
system administration approach to deploying applications. In a traditional
environment, an application (such as a web server) would be a monolithic
application placed on a dedicated server.
As the web traffic increases, the
application would be tuned, and perhaps moved to bigger and bigger hardware.
After a couple of years, a lot of customization may have been done in order to
meet the current web traffic needs.
Instead of using a
large server, Kubernetes approaches the same issue by deploying a large number
of small web servers, or microservices. The server and client sides of the
application expect that there are many possible agents available to
respond to a request.
It is also important that clients expect the server
processes to die and be replaced, leading to a transient server deployment.
Instead of a large Apache web server with many httpd daemons responding to page
requests, there would be many nginx servers, each responding.
Communication to,
as well as internally, between components is API call-driven, which
allows for flexibility. Configuration information is stored in a JSON format,
but is most often written in YAML. Kubernetes agents convert the YAML to JSON
prior to persistence to the database.
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