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A Kubernetes Cluster is a collection of Docker hosts, and a set of management features for running Docker containers in a clustered environment. A Kubernetes Cluster contains node agents (minions) and master components. Kubernetes creates a cluster of Docker hosts to provide high availability for the Docker containers. An API is provided to manage the containers.
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Why is a Kubernetes Cluster needed?
A Kubernetes Cluster manages the clusters you create. Clusters are the compute resources on top of which your containers are built.
How does a Kubernetes Cluster work?
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Network partition
A partition depicts the division in an IaaS and defines an area of an IaaS cloud used by a service subscription. A network partition is an area of an IaaS that is bound by one network of an IaaS. Therefore, it is possible to include one or more partitions inside a network partition. Network partitions use private IPs for internal communication.
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Deployment policy
A deployment policy defines how (such as, which partition algorithm to use) and where to spawn cartridge instances, and it also defines the maximum instances that are allowed in a service cluster. DevOps define deployment policies based on deployment patterns. You need to add the network partitions, which you plan on referring to in a deployment policy, prior to adding a deployment policy.
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Auto-scaling policy
An auto-scaling policy defines the threshold values pertaining to scaling up and scaling down decisions. Auto-scaler will refer to the auto-scaling policy that is defined by DevOps.
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Application policy
An application policy defines the application availability in network partitions. Thereby, it would define whether to start the application in all the network partitions or whether to carryout cloud bursting.
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Cartridge
A cartridge is a container for a framework, load balancer or data management system. You can add a cartridge in a platform as a service (PaaS) for scalability. In Stratos, cartridge runtimes create service runtimes. For example, if you want to have a PHP runtime, you can use a PHP cartridge to get the runtime to deploy your PHP application. A cartridge can be fully configured with all the software and configurations, or zero configured where the cartridge user can install and configure what they want.
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Cartridge group
A cartridge group defines the relationship among a set of cartridge groups and a set of cartridges. The relationship among the children of a group can be the startup order, termination behavior and any scalable dependencies. Writing a cartridge group definition provides the ability to re-use the same frequently used cartridges as needed in different composite applications. The cartridges that correspond to a cartridge group have to be added to Stratos before the cartridge group is added.
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Application
The application provides the actual data required to create the clusters, start the instances and specifies how to connect them in the run-time.
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Overview
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