how hpa works in kubernetes?
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HPA is a great tool to ensure that critical applications are elastic and can scale out to meet increasing demand as well scale down to ensure optimal resource usage. HPA makes scaling decisions based on the observed CPU utilisation values of pods that are part of a Kubernetes controller.
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In Docker, a volume is simply a directory on disk or in another Container. ... A Kubernetes volume, on the other hand, has an explicit lifetime - the same as the Pod that encloses it. Consequently, a volume outlives any Containers that run within the Pod, and data is preserved across Container restarts.
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HPE GreenLake is HPE's market-leading IT-as-a-Service offering that brings the cloud experience to apps and data everywhere, in a fully managed, pay-per-use model. Variable payments are based on actual usage of each service, using a technology-specific unit of measure, such as gigabytes of storage or number of VMs.
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Google Kubernetes Engine (GKE) provides a managed environment for deploying, managing, and scaling your containerized applications using Google infrastructure. The GKE environment consists of multiple machines (specifically, Compute Engine instances) grouped together to form a cluster.
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CMAN (an abbreviation for cluster manager) performs cluster management in the High Availability Add-On for Red Hat Enterprise Linux. CMAN is a distributed cluster manager and runs in each cluster node; cluster management is distributed across all nodes in the cluster.
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A Pod always runs on a Node. A Node is a worker machine in Kubernetes and may be either a virtual or a physical machine, depending on the cluster. Each Node is managed by the Master. A Node can have multiple pods, and the Kubernetes master automatically handles scheduling the pods across the Nodes in the cluster.
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['Navigate to the Manage Jenkins > Manage Plugins page in the web UI.', 'Click on the Advanced tab.', 'Choose the . hpi file under the Upload Plugin section.', 'Upload the plugin file.']
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A PersistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes. It is a resource in the cluster just like a node is a cluster resource.
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['#1) Apache Hadoop.', '#2) CDH (Cloudera Distribution for Hadoop)', '#3) Cassandra.', '#4) Knime.', '#5) Datawrapper.', '#6) MongoDB.', '#7) Lumify.', '#8) HPCC.']
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vSphere HA provides high availability for virtual machines by pooling the virtual machines and the hosts they reside on into a cluster. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts.
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yaml file for the Kubernetes object you want to create, you'll need to set values for the following fields: apiVersion - Which version of the Kubernetes API you're using to create this object. ... metadata - Data that helps uniquely identify the object, including a name string, UID , and optional namespace.
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According to the company, Kubernetes is the kernel of distributed systems, while OpenShift is the distribution. At its core, OpenShift is a cloud-based Kubernetes container platform that's considered both containerization software and a platform-as-a-service (PaaS).
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Like mod_jk and mod_proxy, mod_cluster uses a communication channel to forward requests from the load balancer to one of a set of application server nodes. Unlike mod_jk and mod_proxy, mod_cluster leverages an additional connection between the application server nodes and the load balancer.
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Hadoop is a Java application, and hence it can run on any JVM regardless of the Operating System. In the early days, Hadoop had some issues on Windows but those were sorted out gradually. HDP Sandbox is a virtual machine which you can run on VMware Fusion or Oracle Virtual Box on Windows.
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When you have a large cluster and multiple users, each user doesn't know which compute nodes and CPU cores to use, nor how much resources are available on each node. To solve this, cluster batch control systems are used to manage jobs on the system using HPC Schedulers.
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So a persistent volume (PV) is the "physical" volume on the host machine that stores your persistent data. A persistent volume claim (PVC) is a request for the platform to create a PV for you, and you attach PVs to your pods via a PVC.
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Ingress and egress From the point of view of a Kubernetes pod, ingress is incoming traffic to the pod, and egress is outgoing traffic from the pod. In Kubernetes network policy, you create ingress and egress “allow” rules independently (egress, ingress, or both).