Kubernetes as a Service
What is Kubernetes?
Kubernetes is an open source orchestration system, which makes it possible to automate the operation of Linux containers. It serves as a platform for provision, scaling and running of application containers via cluster and hosts. Multiple groups of hosts are taken into a cluster and Kubernetes supports their efficient administration. Thereby, it eliminates multiple manual processes, which are accompanied by containerised applications. Furthermore, it offers a high degree of availability as well as scalability and additionally it is extensively predictable. Kubernetes enables the administration of containerised applications over their entire lifecycle and users are able to decide themselves how to run applications and how these should interact with each other. Said applications can therefore run on the same computer without interfering with one another. This once more offers a higher degree of efficiency and greatly reduces costs, as there are less hardware requirements.
What are the advantages of Kubernetes for its users?
Next to the previously mentioned advantages, Kubernetes solves a multitude of general problems, which can arise with an increasing number of containers. Multiple containers are taken together into a so-called pod, which adds another abstraction layer to such infrastructure. This assists in the planning of workloads and delivers required services such as storage and interconnection. More generally, a pod is a group of one or multiple containers, which are implemented onto a single node. All containers in such a pod share IP-addresses, IPC and other resources. Pods thus make it possible to abstract networking and storage of the underlying container and thereby ensure facile relocation of said containers within a cluster. Furthermore, Kubernetes aids in the load distribution and ensures that the right amount of containers are available for any given workload.
Kubernetes makes use of a so-called declarative configuration which stands in contrast to imperative configuration, which is a given for traditional hosting. Generally, this bears the advantage that Kubernetes hosting can always depict the required state of the system, as it is a declarative object of configuration. Consequently, users can always choose the state in which their system is supposed to be. This further reduces the susceptibility to errors and offers usage of development tools such as control repository, which once more makes rollbacks much easier.
Kubernetes is also a self-healing online system. This means that the system continuously works toward the status you require. Thus, Kubernetes always ensures that the current condition is in line with the required one and protects the system from errors, which restrict reliability and availability. Kubernetes gives opportunity that maintenance is done independently from administrators. In general, this is both quicker and less costly while freeing up capacity of operators, which can once again be used for the testing of new features.
How to scale?
Naturally, in sight of growing product portfolios the software has to scale as well. Kubernetes makes scaling easier with aid of decoupled architectures. For such architectures every component is separated from other components via previously defined API’s and service load balancers. Therefore, the load balancers function as a buffer between the working instances, while the API’s function as a buffer between the implementer and the user. Since the components are decoupled through the load balancer, the size of the program can be increased effortlessly. This is done without adjustment or reconfiguration of other layers. In addition, Kubernetes allows for automated scaling next to the ordinary manual scaling. The manual scaling assumes that there is a sufficient amount of resources available at all times. If this is not the case, the cluster will have to be increased in size manually once more. This process is still simplified, because all machines within the cluster are identical and applications are taken off machines via the containers. To add new resources, all that is necessary is to create a new machine with given prerequisites.
Area of application – microservice architecture
In general, microservices are a design pattern, under which complex application software is comprised of independent processes. When building such architectures, multiple teams work on a single service, which can afterwards once again be used by other teams for the purpose of implementation. A connection of these services lastly offers integration for the entire product interface. Kubernetes supports the implementation of such microservice architecture with the aid of different API’s and abstractions. Like this, pods can connect the different containers of individual teams to a single disposable unit. The decoupling of these containers makes it possible for multiple microservices to coexist on the same underlying machine without interfering with one another. A direct consequence is the reduction in overhead and microservice architecture costs. Furthermore, Kubernetes hosting offers both load balancing as well as discovery, to isolate certain microservices from one another. To enhance the control of interactions between individual services, so-called namespaces offer additional isolation and access control. Thus, every microservice can decide on to what extend other services are able to interact with it.
Kubernetes was developed to give other developers more agility and efficiency. The advantages of Kubernetes generally are the declarative administration of services, which hence works exactly as planned. A maximisation of resources for the operation of necessary applications for your entity as well as the facile provision and automatic update of applications, together with quick scalability if required. We do hope that the previously mentioned areas of application and the listed functions show you why making use of Kubernetes for certain applications can be highly advantageous for your entity.