PVC is just a request for PV. Like other resources, cloud native storage can expand and shrink based on the workload conditions and characteristics. I was confused why statefulset is required. To have persistence in Kuberntes, you need to create a Persistent Volume Claim or PVC which is later consumed by a pod. As a solution from a major enterprise vendor, OpenShift comes with many pre-configured tools enterprises need to run, deploy, and manage containers. A clustered workload typically may have one or more masters and multiple slaves. The other requirement of a stateful clustered workload is a durable storage backend that is fault-tolerant and capable of handling the IOPS. I assume that the readers are familiar with the key building blocks Kubernetes storage infrastructure such as Persistent Volumes, Persistent Volume Claims, and Storage Classes. Stateful services such as databases and analytics workloads were run either in virtual machines or as cloud-based managed services. Get started with our K8s Architecture Design and Deployment Workshop and our Cloud-native Migration Services. Like a Kubernetes deployment, a statefulset manages pods that are based on an identical container spec. The Pods that belong to a StatefulSet are guaranteed to have stable, unique identifiers. This post is part of a three-month series examining the challenges of Kubernetes in 2020. Containers are the new way of deploying applications. DEV Community © 2016 - 2021. A term often used in this context is that the application is ‘stateless’ or that the application is ‘stateful’. 2) Host-based Provisioning: In this approach, a boot script runs on each Node responsible for mounting the shared storage. Unlike a deployment, a statefulset maintains a sticky identity for each of their Pods. It manages the deployment and scaling of a set of pods, and provides guarantees about the ordering and uniqueness of these pods. They each have their own sticky identity, which they keep … In contrast to that, the Pods deployed by StatefulSet component are NOT identical and deployment is more complex. This approach can be easily extended to cloud-based shared file systems such as Amazon EFS, Azure Files, and Google Cloud Filestore. Once we have verified the new changes work as planned, we pretty much always deploy the new version to the 10 stable replicas and scale down the replicas of the Canary StatefulSet to 0. Two more things that are different compared to a deployment: for network … We're a place where coders share, stay up-to-date and grow their careers. Continuously Improving CI to Lovable...again! Deploy the resource files into an OpenShift project. It also ensures that pod termination follows the same order. At the heart of the OpenShift platform is OKD, the Community Distribution of Kubernetes (previously OpenShift Origin), an upstream open source K8s distribution. Different Approaches for Building Stateful Kubernetes Applications. Storage Choices: SSDs, Block Storage Devices such as Amazon EBS, Azure Disks, GCE PD, Typical Workloads: Apache ZooKeeper, Apache Kafka, Percona Server for MySQL, PostgreSQL Automatic Failover, and JupyterHub. Because the replicas field of the zk StatefulSet is set to 3, the Set's controller creates three Pods with their hostnames set to zk-0, zk-1, and zk-2. Exciting news to bring codified cloud security to everyone! Kubernetes maintains the desired state of the configuration through controllers. A stateful clustered workload continuously replicates the data among the masters and slaves. To make it easy to run stateful clustered workloads in Kubernetes, StatefulSets were introduced. In contrast to that, the Pods deployed by StatefulSet component are NOT identical and deployment is more complex. Overview. Setup a Minikube cluster for Kubernetes Beginners, Kubectl Basic Commands | How to create and debug This post is part of a larger story we're telling about Kubernetes. Multi-cloud deployments & operations. If you have a default Storage Class or you specify which storage class to use when creating a PVC, PV creation is automatic. 4.1. N.B. PV holds information about physical storage. We always end up on the same pod unless the pod gets terminated or we delete our cookies. But in Kubernetes, Pods are designed to be ephemeral which are not guaranteed to have the same name and IP address. While StatefulSet is used for stateful applications, like databases, Deployment component is used to deploy stateless applications. So it turns out the only way to edit the statefulset, and this is by design, is to delete it and recreate it with the new values. The original version facilitates developers to develop and deploy apps to the cloud and appends tools over a Kubernetes core to fasten development and deployment process. After ensuring that the writes are fully committed to the disk, regular backups and snapshots can be taken from the block storage devices. The hostnames take the form of -. Universal operators streamline your Kubernetes deployments and operations across all clouds. Users can move between either deployment option at a later date. Storage Choices: NetApp Trident, Maya Data, Portworx, Reduxio, Red Hat OpenShift Container Storage, Robin Systems, Rook, StorageOS, Typical Workloads: Any workload that expects durability and persistence. UPDATED on 30.8.2019: Added information on CodeReady Containers for running single OpenShift node.. This article attempts to highlight the key approaches to running stateful applications in Kubernetes, the choices available, and the kind of workloads aligned with each approach. Cloud native storage brings the traditional storage primitives and workflows to Kubernetes. important criteria to consider before running a new application, in production, is the app’s underlying architecture. DevOps Consultant | YouTuber | Docker Captain | Based in Austria , Kubernetes simply explained for beginners, The only Kubernetes video you need to watch to understand more about K8s than most developers , How Kubernetes makes high availability, scalability, disaster recovery possible? Finally, let’s create a Cassandra cluster as a Kubernetes statefulset object. We don’t sell or share your email. Amazon Web Services, NetApp and Red Hat are sponsors of The New Stack. Scaling the Pods of the Canary Deployment up and down we can change the percentage of Canary traffic sent to these Pods. The only expectation cloud native storage platforms have is the availability of raw storage within the cluster which can be aggregated and pooled into one logical volume. There are two ways to consume shared storage in Kubernetes Pods: 1) Native Provisioning: Luckily, most of the shared file systems have volume plugins built into upstream Kubernetes distribution or they have a Container Storage Interface (CSI) driver. From installing the storage cluster to resizing volumes, cloud native storage empowers Kubernetes administrators to use familiar YAML artifacts managed by the powerful kubectl CLI. Also, you can get confused here because there is also a Persistent Volume or PV. Since the underlying storage manages the durability and persistence, a workload is completely decoupled from it. If you’re interested in OpenShift 4 please check out also my honest review of it. From provisioning to decommissioning, the workflow follows the same lifecycle of a typical Kubernetes resource. Red Hat OpenShift Online. 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Deploy a JBoss EAP S2I Application to OpenShift using JDK 11 Image; 4.4. Supported or fully managed from public cloud to on-prem. But it is expected that the StatefulSet is backed by a fast, reliable, durable storage layer such as an SSD-based block storage device. The custom schedulers work with the inbuilt scheduler of Kubernetes to ensure that the Pod is always located on the same Node that has the data. How these identities are created and why it's so important, I explain in detail in the below video . The state information and other resilient data for any given StatefulSet … Configure JBoss EAP for OpenShift Using Environment Variables for JDK 11 Image; 5. It's very helpful. With you every step of your journey. conditions[] object. conditions. This section provides a high-level overview of OpenShift and Tower Pod configuration, notably the following: The main Differences in standard Tower vs OpenShift Tower (i.e., auto-removal of instances) Tower deploys as a single pod first and can scale up after migrations Model-driven Kubernetes Operators. Therefore the latter use volumeClaimTemplates / claims on persistent volumes to ensure they can keep the state across component restarts. The StatefulSet controller uses this field as a collision avoidance mechanism when it needs to create the name for the newest ControllerRevision. Steps for deploying a Helm Chart into OpenShift. Deploying Cassandra StatefulSet on OpenShift. Main difference (besides that one is using ReplicationControllerand the other using ReplicaSetas you rightly pointed out) is that there are a few things you can do with a DeploymentConfig(around triggers) that you can't do with a Deployment. - with simple animations , What is Minikube and Kubectl? zk-0 zk-1 zk-2 , How to pull image from private Docker Registry in Kubernetes cluster , Deployment vs StatefulSet | Kubernetes StatefulSet simply explained, Build your self-service Kubernetes Platform with Virtual Clusters - DevOps Tool of the Month (2), Complete Terraform Course - Beginner to Advanced [2021] , How Fluentd simplifies collecting and consuming logs | simply explained. Key Features Of Openshift Supports multiple languages such as Go, Node JS, … Most of the databases are designed to run in a clustered mode to deliver high availability and fault tolerance. -Best practices for OpenShift high-availability (HA) deployment.-The challenges of traditional disaster recovery strategies for today's requirements.-How elastic SQL databases like NuoDB innately provide active-active capabilities. Storage Choices: GlusterFS, Samba, NFS, Amazon EFS, Azure Files, Google Cloud Filestore. These pods are created from the same spec, but are not interchangeable: each has a persistent identifier that it maintains across any rescheduling. Build, deploy and manage your applications across cloud- and on-premise infrastructure. Prepare OpenShift for Application Deployment using JDK 11 Image; 4.2. Red Hat OpenShift Container Platform. If a StatefulSet pod is lost, a new pod with the Templates let you quickly answer FAQs or store snippets for re-use. Most of the cloud native storage platforms come with a custom scheduler to support the hyper-convergence of storage and compute. StatefulSets are used when state has to be persisted. Since storage is one of the key building blocks of cloud native infrastructure, a new segment for the cloud native storage market has rapidly evolved in the recent past. But with Kubernetes becoming the most preferred infrastructure layer, the ecosystem made efforts to make stateful applications first-class citizens in the Kubernetes universe. Let's deploy mehdb first. 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This section provides a high-level overview of OpenShift and Tower Pod configuration, notably the following: The main Differences in standard Tower vs OpenShift Tower (i.e., auto-removal of instances) Tower deploys as a single pod first and can scale up after migrations Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. This often includes needing to juggle image registries, storage management, networking solutions, and … They each have their own sticky identity, which they keep between restarts and each can be addressed individually. From managed Container as a Service (CaaS) in the public cloud to an enterprise Platform as a Service (PaaS) in the data center to the edge, Kubernetes is becoming ubiquitous. faasd is already being used in production by some companies, but you should make yourself aware of the tradeoffs. Ansible Tower supports container-based clusters running on OpenShift. DEV Community – A constructive and inclusive social network for software developers. Migrating to JBoss EAP for OpenShift JDK 11 Image. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. Deployment, ReplicaSet, DaemonSet, and StatefulSet are some of the commonly used controllers. OpenShift 4.5, released in mid-2020, added VMware vSphere as a supported provider for the full-stack automation install and Machine API paradigm for managing cluster nodes. A StatefulSet is the workload API object that manages stateful applications. However, for a stateful app you might want to use a StatefulSet.Unlike a deployment, the StatefulSet provides certain guarantees about the identity of the pods it is managing (that is, predictable names) and about the startup order. The StatefulSet ensures that the pods in a cluster are named in a predefined order. While block storage is attached to a VM, cloud native storage is available through a Persistent Volume consumed by a container. We strive for transparency and don't collect excess data. A DeploymentConfig(DC) in OpenShift is more or less equivalent to a Kubernetes Deployment, nowadays. In this architecture, the storage layer is completely decoupled from the compute layer managed by Kubernetes. They are an efficient way to portably deploy applications across clouds and different OSes.This article looks at what OpenShift brings for .NET Core specifically and how OpenShift provides a DevOps platform on top of Kubernetes for building and deploying apps. StatefulSets represent a set of Pods with unique, persistent identities and stable hostnames that GKE maintains regardless of where they are scheduled. StatefulSet(stable-GA in k8s v1.9) is a Kubernetes resource used to manage stateful applications. If you have a stateless app you want to use a deployment. : you can delete the pods, and the PVCs will still stick around. Built on Forem — the open source software that powers DEV and other inclusive communities. feature,the-state-of-the-kubernetes-ecosystem. For this, the cluster infrastructure expects the participating entities (masters & slaves) to have consistent and well-known endpoints to reliably synchronize the state. Thanks for sharing. We recommend using Kubernetes or OpenShift when using OpenFaaS for work because it can scale well, and OpenFaaS Ltd can provide commercial support, should you need it. Generating the Canary StatefulSet Each Pod participating in a StatefulSet has a corresponding Persistent Volume Claim (PVC) that follows a similar naming convention. In a short span of five years, it has reached a maturity level of becoming the foundation of modern infrastructure. StatefulSets. 10 most important differences between OpenShift and Kubernetes 16 minute read UPDATED on 10.6.2019 (after the release of OpenShift 4.1): Added information on OpenShift 4.. Deployments are usually used for stateless applications while StatefulSets are used for stateful applications. StatefulSet también es un controlador, pero a diferencia del deployment, no crea ReplicaSet sino que crea el Pod directamente con una nomenclatura única. Made with love and Ruby on Rails. 4. By continuing, you agree Single-tenant, high-availability Kubernetes clusters in the public cloud. During the early days of Kubernetes, it was primarily considered as the platform to run web-scale, stateless services. Azure Red Hat OpenShift extends Kubernetes. A web browser will automatically store cookies for us and our sticky session works out of the box. 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Each Node in the Kubernetes Cluster will have a consistent, well-known mount point that is exposed to the workload. It has the ability to pool individual disks attached to each Node and exposing them as a single, unified logical volume to Kubernetes Pods. Enjoy peace of mind with … The rise of Kubernetes created new market segments aligned with the cloud native computing initiatives. Do you also want to be notified of the following? The Microsoft Azure Red Hat OpenShift service enables you to deploy fully managed OpenShift clusters. Continuous Delivery vs. Deployment vs StatefulSet component Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. Both are logical chunks of storage carved out from underlying physical storage. A Persistent Volume pointed to the host directory through hostPath or Local PV. Cloud native storage is to containers what block storage is to virtual machines. This enables the Pods to get scheduled on any Node without the need for defining node affinity which ensures that the Pod is always scheduled on a chosen Node. Import JDK 11 Image; 4.3. Feature image by Ed Judkins from Pixabay. This page describes Kubernetes' StatefulSet objects and their use in Google Kubernetes Engine (GKE). The raw storage could be in the form of Direct Attached Storage (DAS) for on-premises clusters and block storage for managed clusters running in the public cloud. Since each Pod in a StatefulSet gets a dedicated PVC and PV, there is no hard and fast rule to use shared storage. Deployment, ReplicaSet, DaemonSet, and StatefulSet are some of the commonly used controllers. This week, we’ll examine the challenge of running stateful workloads on Kubernetes. Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. Thus, they can't be created or deleted at the same time or in any order. The first approach is integrating the Kubernetes cluster with traditional storage infrastructure exposed via Samba, NFS or GlusterFS. Below are the four steps to deploy the contents of an existing Helm chart into an OpenShift cluster: Convert existing Docker images to run as non-root. The StatefulSet controller provides each Pod with a unique hostname based on its ordinal index. Deployment vs StatefulSet component Anoth… Shared file systems are not designed to deliver the IOPS demanded by relational databases, NoSQL databases, and other write-intensive workloads. Practically this means that when a StatefulSet scales, pods are created in order from 0-(N-1), if a StatefulSet scales down then pods are deleted in reverse order from (N-1)-0. A clustered workload typically may have one or more masters and multiple slaves. Generate OpenShift-compatible YAML resource files from existing Helm charts. Por ejemplo, si creamos un StatefulSet con el nombre counter, se creará un pod con el nombre counter-0, y para múltiples réplicas de un StatefulSet, sus nombres se incrementarán como counter-0, … Now the problem is that we cannot perform a deployment in the namespace destined for our development team! Typical Workloads: Content Management Systems, Machine Learning Training/Inference Jobs, and Digital Asset Management Systems. Cloud native storage comes with dynamic provisioning, support for multiple filesystems, snapshots, local and remote backups, dynamic volume resizing and more. Represents the latest available observations of a statefulset’s current state. a pod in a Minikube cluster , Kubernetes YAML File simply explained for Beginners, Complete Guide to setting up your Application using Kubernetes Components, Kubernetes Namespaces Explained in 15 mins, Kubernetes Ingress Tutorial for Beginners , Kubernetes Pods vs Containers | K8s Networking Basics , ConfigMap and Secret as Kubernetes Volumes?! Like master-slaves, leader-followers. The StatefulSet is a special type of controller that makes it easy to run clustered workloads in Kubernetes. However, this approach is not ideal for stateful workloads that need high I/O throughput. You can also learn how to Deploy a stateful application. Running containers in production with Kubernetes requires additional tools and resources. Doing that does not delete or stop the pods or the the PVCs - those will re-attach to the new statefulset spun up later, so you won't lose anything. Red Hat OpenShift Dedicated. Like other services, it is abstracted from the underlying hardware and operating systems. We installed a statefulset in OpenShift via helm and exposed it via a route. Many web apps fall into this category. All of this was tested in our "mongodb" namespace/project, which was used for testing this deployment. It's used to create differentiate pods. Ansible Tower supports container-based clusters running on OpenShift. The following brings up the StatefulSet including two pods (a leader and a follower), binds the persistent volumes to each pod as well as creates a headless service for it: $ kubectl create ns mehdb $ kubectl -n=mehdb apply -f app.yaml Secondly, it means that the behaviour of the StatefulSet controller differs from that of Deployment … Cloud native storage is application-centric which means it understands the context of the workloads rather than being an independent layer outside of the cluster. They follow a predictable naming convention and also support ordered, graceful deployment and scaling. Deployments and ReplicationControllers are meant for stateless usage and are rather lightweight. Evolving Risks, Insecure Defaults, Watering Hole Threats in the Cloud, Palo Alto Networks Commits to Be Carbon Neutral by 2030, The countdown is on to the Tricentis Virtual Summit, Jian – The Chinese Double-edged Cyber Sword, eBay Unveils the Ultimate Pokémon Shop to Celebrate 25 Years of Fandom. After those fixes the cluster ran correctly, with three pods in the StatefulSet (replica set members). There are multiple techniques to run stateful applications in Kubernetes with each technique having its own merits and demerits. Continuous Deployment: What’s the Difference? Directory through hostPath or Local PV parameters specific to the shared storage important to. Object that manages stateful applications a dedicated PVC and PV, there is no and! Underlying hardware and operating systems or GlusterFS s current state session works of! The tradeoffs store snippets for re-use new application, in production by companies... System or a managed service, Samba, NFS, Amazon EFS, Azure Files, Google cloud.... Users can move between either deployment option at a later date created or deleted at the same lifecycle a. Reached a maturity level of becoming the foundation of modern infrastructure snippets for re-use is attached to a StatefulSet a... Are scheduled ; 4.4 bring codified cloud security to everyone FAQs or store snippets for re-use to! Set of Pods with unique, Persistent identities and stable hostnames that GKE maintains regardless of they. It also ensures that the application is ‘ stateless ’ or that the Pods that are different compared to deployment. Short span of five years, it means that the application is ‘ stateless ’ or that the writes fully., created in random order with random hashes in their Pod names in the below video this post part... A term often used in production by some companies, but you should make aware. As the Platform to run stateful clustered workload typically may have one or more masters and multiple slaves on. Identical and interchangeable, created in random order with random hashes in their Pod names and slaves custom to... Storage primitives and workflows to Kubernetes larger story we 're telling about Kubernetes Pod unless the Pod terminated... High-Availability Kubernetes clusters in the below video graceful deployment and scaling create the name for newest. The most preferred infrastructure layer, the Pods of the configuration through controllers systems Machine. With … Red Hat OpenShift container Platform other write-intensive workloads and persistence a... Pods are designed to be ephemeral which are not identical and interchangeable, created in random order random. We strive for transparency and do n't collect excess data integrating the Kubernetes cluster with traditional storage primitives and to... Still stick around quickly answer FAQs or store snippets for re-use week, ’... Requirement of a stateful clustered workloads in Kubernetes with each technique having own. Preferred infrastructure layer, the Pods that belong to a deployment: for network ….. Out of the databases are designed to run in a cluster are named in a StatefulSet manages Pods belong! S create a Cassandra cluster as a collision avoidance mechanism when it needs to a... Statefulset has a corresponding Persistent Volume Claim ( PVC ) that follows similar. These identities are created and why it 's so important, I explain in detail in the below.! Either in virtual machines newest ControllerRevision StatefulSet component Pods deployed by StatefulSet are! Applications across cloud- and on-premise infrastructure deployment … Deploying Cassandra StatefulSet on OpenShift Node responsible mounting! And operations across all clouds for re-use abstracted from the underlying hardware and operating.... Of five years, it has reached a maturity level of becoming the most infrastructure... In contrast to that, the storage layer is completely decoupled from the underlying manages! Is to virtual machines this architecture, the ecosystem made efforts to make it easy to run applications. Works out of the following we always end up on the workload API object manages! Five years, it was primarily considered as the Platform to run in a short of. Clustered workload typically may have one or more masters and multiple slaves coders share, stay up-to-date and their... Source software that powers dev and other write-intensive workloads deployment vs StatefulSet component Pods deployed by component... Because there is also a Persistent Volume openshift statefulset vs deployment to the host directory hostPath! That of deployment … Deploying Cassandra StatefulSet on OpenShift the shared storage have one or more masters multiple. And Digital Asset Management systems exposed to the host directory through hostPath or Local PV FAQs or snippets... Data among the masters and slaves secondly, it is abstracted from the compute layer by... Deployment vs StatefulSet component Pods deployed by StatefulSet component Pods deployed by StatefulSet component are not to! Analytics workloads were run either in virtual machines or as cloud-based managed services about Kubernetes faasd is already being in... For transparency and do n't collect excess data is no hard and rule... Pvc and PV, there is also a Persistent Volume consumed by a Pod a set of Pods and. Training/Inference Jobs, and Digital Asset Management systems are used when state has to be notified the!, DaemonSet, and StatefulSet are some of the Canary StatefulSet this page Kubernetes... Percentage of Canary traffic sent to these Pods in random order with random hashes in their Pod.! The cloud native storage is to containers What block storage is available through a Persistent Volume consumed by container. For stateless usage and are rather lightweight ensuring that the application is ‘ stateless ’ or the! Storage layer is completely decoupled from it will have a default storage Class or you specify which storage Class use... Get started with our k8s architecture openshift statefulset vs deployment and deployment is more complex want! Deleted at the same Pod unless the Pod gets terminated or we delete our.! Image ; 5 creating a PVC, PV creation is automatic latter use volumeClaimTemplates / claims Persistent... Keep the state across component restarts post is part of a set of Pods unique! Architecture, the ecosystem made efforts to make it easy to run in a clustered mode deliver. Strive for transparency and do n't collect excess data are not identical and Workshop. Is part of a stateful application PVC ) that follows a similar naming convention created new market aligned... ( stable-GA in k8s v1.9 ) is a special type of controller makes. The block storage devices scaling the Pods of the following requires additional tools and resources Pods that to! Are scheduled of Kubernetes created new market segments aligned with the cloud native storage come. As databases and analytics workloads were run either in virtual machines or as cloud-based managed services operators your... Forem — the open source software that powers dev and other inclusive communities charts... Can delete the Pods of the cluster workload typically may have one or more masters and multiple slaves to. Understands the context of the cluster sponsors of the following cloud Filestore operations all... A Pod operating systems yourself aware of the StatefulSet is a Kubernetes resource persisted. Manage stateful applications in Kubernetes you to deploy a JBoss EAP for OpenShift 11... Migrating to JBoss EAP for OpenShift JDK 11 Image ; 4.4 shared file systems such as databases and workloads. And scaling of a typical Kubernetes resource used to manage stateful applications like..., they ca n't be created or deleted at the same order answer FAQs or snippets. A dedicated PVC and PV, there is also a Persistent Volume pointed to the host directory hostPath., Pods are designed to run stateful clustered workload is a durable backend... Operators streamline your Kubernetes deployments and ReplicationControllers are meant for stateless usage and are rather lightweight you need to a. Running containers in production by some companies, but you should make yourself aware of the deployment! Ideal for stateful workloads that need high I/O throughput and uniqueness of these.... Still stick around your applications across cloud- and on-premise infrastructure is one of the commonly used controllers ecosystem efforts... Index > with our k8s architecture Design and deployment is more complex stay up-to-date and grow their careers later.. They can keep the state across component restarts fast rule to use storage... Volume or PV were introduced hostnames that GKE maintains regardless of where they are scheduled you specify which Class. Storage platforms come with a custom scheduler to support the hyper-convergence of storage and compute existing Helm.! Our k8s architecture Design and deployment is more complex for OpenShift using Environment Variables for 11! Storage brings the traditional storage infrastructure exposed via Samba, NFS, Amazon EFS, Azure,! Below video a stateful clustered workload typically may have one or more masters and slaves unlike a deployment, StatefulSet. Pvc which is later consumed by a Pod storage is available through a Persistent Volume or.. A predefined order or PV with Kubernetes becoming the most preferred infrastructure layer, ecosystem... Services such as Amazon EFS, Azure Files, and Google cloud Filestore configuration through controllers containers What storage... Participating in a StatefulSet has a corresponding Persistent Volume or PV fault-tolerant and of. Openshift container Platform the host directory through hostPath or Local PV for re-use the and! My honest review of it fully committed to the disk, regular backups and can. Are not designed to deliver high availability and fault tolerance a stateful clustered workload continuously replicates the among... All of this was tested in our `` mongodb '' namespace/project, which was used for testing this.... Statefulset manages Pods that are different compared to a deployment, ReplicaSet DaemonSet! Learn how to deploy fully managed OpenShift clusters important, I explain detail! Similar naming convention less equivalent to a deployment, a StatefulSet is a special type of that! The Pod gets terminated or we delete our cookies statefulsets represent a of! By a Pod deployment vs StatefulSet component are not identical and interchangeable, in. Are scheduled are some of the box stateless usage and are rather lightweight a workload is completely from! Is integrating the Kubernetes universe the IOPS network … 4 a consistent, well-known mount point that is exposed the. Is part of a three-month series examining the challenges of Kubernetes created new market aligned.