Deployment is the easiest and most used resource for deploying your application. Redis (REmote DIctionary Server) is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. Hi sure, that's why I noted at the end of the video that k8s supports you in that but, data synch, cloning config and storage management is your responsibility and k8s doesn't help you there. When comparing a Deployment vs Replica Set, the former provides the same replication functions (through Replica Sets) and also the ability to rollout changes and roll them back if necessary. For deploying the sample counter app using a daemonset, we will be using the following manifest. Stará se o deploy a škálování skupiny podů a zajišťuje pořadí a unikátnost těchto podů. StatefulSets. One of you recent posts about volumes in k8s was removed. Where you are bound to the storage of your physical machines? It manages the deployment and scaling of a … Deployment kind provides all required application life-cycle for your applications. Kubernetes provides a basic resource called Pod. Have you ever operated such a thing on a bare-metal cluster, where you don‘t have cloudy mechanisms to mount storage into your pod? I didn't write them, but I guess because of self promotion, which I partly understand. In our previous post, we guided you through the process of deploying a stateful, Dockerized Node.js app on Google Cloud Kubernetes Engine! The list of stateful charts using a StatefulSet: $ git grep -li 'kind: *StatefulSet' | awk -F '/' '{print $1}' cockroachdb concourse consul ipfs memcached minio mongodb-replicaset rethinkdb A common usage is for Alertmanager's high availability mesh configuration, which allows Alertmanager to manage alert lifecycles statefully without any external databases or dependencies. Another way and less desirable is t… You will have to specify the tolerations for it on the pod. Statefulset, aka something that should have never existed. you can see a new pod created, if you check the logs of the new pod, its logs will not start from 1 rather it will start from the last number of the 1st pod. When you deploy the daemonset, it will create pods equal to the number of nodes. They shouldn't be the first choice for most apps but they enable some cases to work really well. one replica pod will go down and the updated pod will come up, then the next replica pod will go down in same manner e.g. you can deploy it by copying the below manifest and saving it in a file e.g. There must be at least an option to be able to deploy stateful apps along with stateless ones in the same cluster. Meanwhile, the StatefulSet type features the following: Service is allocated a dedicated SSD. StatefulSet(stable-GA in k8s v1.9) is a Kubernetes resource used to manage stateful applications. This allocated storage is persisted even if Pods and Nodes restart. Also, the default setup defined in app.yaml assumes that a storage class ebs is defined. From deployment perspective and important detail is the use of Azure Service Bus Users perform both read and write operations using the API, all writes goes through Azure Service Bus before being picked up and persisted (we're considering writing directly by default and only use Ser… Automated rolling updates are ordered. ; However, unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. We will use the manifest file shown below to declaratively set the different properties. It can store and manipulate high-level data types like lists, maps, sets, and sorted sets. So the question is: what is the difference between … For the StatefulSet, we need to specify the serviceName attribute. Below are 3 different resources that Kubernetes provides for deploying pods. Deploying Stateful Applications. Also if you check the Persistent Volume Claims(PVCs), only one PVC will be created that both the pods will be sharing. The headless service representing the master is associated to the pod with ordinal index 0. StatefulSets make it easier to deploy stateful applications into our Kubernetes cluster. It is a Kubernetes controller that matches the current state of your cluster to the desired state mentioned in the Deployment manifest. To have persistence in Kuberntes, you need to create a Persistent Volume Claim or PVC which is later consumed by a pod. StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself creates the Pod with a unique naming convention. daemonset.yaml, and then applying by. Unlike Deployments, you cannot roll back your DaemonSet to a previous version. We specify the kind as StatefulSet. The new pods will have their own Volume and if you check the logs, the count will again start from 1 for the new pods, unlike in Deployments as we saw earlier. Each entry in the value section refers to one of the Pods of the MongoDB StatefulSet. The master node is already tainted by: Which means it will repel all pods that do not tolerate this taint, so for daemonset to run on all nodes, you would have to add following tolerations on DaemonSet. Use the right-hand menu to navigate.) The deployment file you create will depend on whether the application requires K8s to manage it as a Deployment Object or a StatefulSet Object. PV holds information about physical storage. Besides the fact that you can perfectly store state in a deployment using static or dynamic storage provisioning methods - how would you target the first out of three pods in a stateful-set? If an error occurs while updating, so only counter-2 will be down, counter-1 & counter-0 will still be up, running on previous stable version. A pod can have one or more containers and you can pass different configuration to the container(s) using the pod’s configuration e.g. Deployments are usually used for stateless applications. StatefulSet is used to manage stateful applications: It manages the deployment and scaling of a set of Pods. Kubernetes uses StatefulSet features to deploy stateful applications. Thank you very much for writing them, maybe that's why they re-activated it :) . Cassandra, a database, needs persistent storage to provide data durability (application state).In this example, a custom Cassandra seed provider lets the database discover new Cassandra instances as they join the Cassandra cluster. I'm unable to exactly find the distinctions between what a deployment and what a statefulset is and in what different cases would you use each? counter-0. Because Redis can accept keys in a wide range of formats, operations can be executed on the server and reduce the client's workload. A pod is the smallest deployable unit in Kubernetes which is actually a wrapper around containers. Unlike Deployments, you cannot roll back to any previous version of a StatefulSet. Deployments, as discussed, creates a ReplicaSet which then creates a Pod so whenever you update the deployment using RollingUpdate(default) strategy, a new ReplicaSet is created and the Deployment moves the Pods from the old ReplicaSet to the new one at a controlled rate. I agree with you to some extent. Kubernetes provides two solutions to run databases inside Kubernetes. So the question is: what is the difference between Deployment and StatefulSet components? These pods are created from the same spec, but are not interchangeable: each has a persistent identifier that it maintains across any rescheduling. If you create a deployment with name counter, it will create a ReplicaSet with name counter-, which will further create a Pod with name counter--. If an error occurs while updating, so only one pod will be down, all other pods will still be up, running on previous stable version. (This article is part of our Kubernetes Guide. Even for scheduling? StatefulSet Deployments provide: Stable, unique network identifiers: Each pod in a StatefulSet is given a hostname that is based on the application name and increment. StatefulSets. Also only one PVC will be created that all pods will be sharing. statefulset.yaml, and then applying by, If you deploy the above statefulset, and see the logs of the pod, you will be able to see the log in order like 1,2,3,…, Here, you can see the logs start from 1. In terms of behavior, it will behave the same as Deployments i.e. Alongside StatefulSets you have Headless Services that are used for discovery of StatefulSet Pods. That’s all, these are the main resources to deploy your applications (containers) on Kubernetes. e.g. kubectl scale deployment counter --replicas=2, kubectl scale statefulsets counter --replicas=3, https://pixabay.com/photos/container-ship-container-ship-537724/, How to Love Kubernetes and Not Wreck The Planet Part I: Elasticity and Utilization, How to install Ubuntu Server on Raspberry Pi, Why I Wrote a Program in Brainf**k, and Why you Should Too, Configuring HAProxy With Ansible Roles on AWS, How I got control of my spending with a couple no-code services and only 100 lines of Python code. I base this tutorial from the one on the Kubernetes site on ZooKeeper and StatefulSet but I am going to deploy to MiniKube, local Open Shift, and KIND. Once you go through this Kubernetes tutorial, you’ll be able to follow the processes & ideas outlined here to deploy any stateful application on Azure Kubernetes Service (AKS). Deployment Object vs StatefulSet Object . PVC is just a request for PV. Here, the logs are again starting from 1, as this pod has its own Volume, so it doesn’t read the file of 1st pod. Lets see how we can create a StatefulSet. Some typical use cases of a DaemonSet is to run cluster level applications like: However, Daemonset automatically doesn’t run on nodes which have a taint e.g. If you have a stateless app you want to use a deployment. I see your multi cross-post and I upvote everywhere. To allow the application to be able to scale horizontally, we have to change the type of workload from Deployment to StatefulSet to make the stateful app work. one pod will go down and the updated pod will come up, then the next replica pod will go down in same manner e.g. Orchestrating Databases Inside Kubernetes: StatefulSets vs DaemonSets. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. If I change the image of the above StatefulSet, the counter-2 will terminate and once it terminates completely, then counter-2 will be recreated and counter-1 will be terminated at the same time, similarly for next replica i.e. it will first create a new pod counter-1, and once that pod is ready, then another pod counter-2. In order to try out the following, you'll need a Kubernetes 1.9 (or higher) cluster. First create a new configuration file, deployment.yaml, and add the following: Network identifiers are stable and unique (e.g., search-0, search-1) Deployment and scaling are ordered. StatefulSet In Action. you can deploy it by copying the below manifest and saving it in a file e.g. For more details about pods, check Pod. In this video, I will explain about Statefulset resource and how to deploy one in your Kubernetes cluster. In this post, I will be discussing three different ways to deploy your application(pods) on Kubernetes using different Kubernetes resources. Kubernetes (K8s) is an open-source container orchestration system for automating deployment, scaling, and management of containerized applications. Deployments are usually used for stateless applications while StatefulSets are used for stateful applications. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. ; It provides guarantees about the ordering and uniqueness of these Pods. PV in StatefulSet. This tutorial shows you how to run Apache Cassandra on Kubernetes. Let’s create a simple Deployment using the same image we’ve been using. Usage patterns StatefulSets are designed to deploy stateful applications and clustered applications that save data to persistent storage, such as Compute Engine persistent disks. Kubernetes is not meant for everything, some day people will understand. StatefulSet je Kubernetes resource používaný na udržování stateful aplikací. That's why as I mentioned in a different comment below, complexity of setting a stateful app in k8s, depends on DB app, and general project setup. e.g. Alternatively, code a Deployment manifest and run the kubectl apply command for resource creation. The first resource we need to create is the configurations we want to inject into postgres pod with a configmap. The following summarizes some distinguishing characteristics between the Deployment and StatefulSet types: StatefulSets are a group of pods with unique stable hostnames and persistent identities. Use kubectl to deploy the web ReplicaSet along with the web Service. A StatefulSet is similar to a deployment in that one or more identical pods are created and managed. If you create a deployment with 1 replica, it will check that the desired state of ReplicaSet is 1 and current state is 0, so it will create a ReplicaSet, which will further create the pod. StatefulSet(stable-GA in k8s v1.9) is a Kubernetes resource used to manage stateful applications. Rolling Update means that the previous ReplicaSet doesn’t scale to 0 unless the new ReplicaSet is up & running ensuring 100% uptime. Introduction. For deploying the sample counter app using a deployment, we will be using the following manifest, you can deploy it by copying the below manifest and saving it in a file e.g. Kubernetes uses the StatefulSet controller to deploy stateful applications as StatefulSet objects. If a node is added/removed from a cluster, DaemonSet automatically adds/deletes the pod. Deployment. In contrast to that, the Pods deployed by StatefulSet component are NOT identical and deployment is more complex. Let's deploy mehdb first. Once the deployment is created, a user can scale it, update it, or even delete it, later. I am using the counter file from a Persistent Volume to detail the differences between the Deployments, StatefulSets and DaemonSets. Decent explanation, but you made it a little mysql-centric so you kind of made it sound like a good bit of the mysql replication stuff was handled by kubernetes instead of it being manually set up in the containers. If you see the logs, they are starting from 73, meaning that the previous pod had written till 72 in the file and they both are sharing the same file and volume and data is consistent across all pods of a Deployment. The manifests files to deploy the following resources can be found in the counter app. That what makes using statefulSet more complex than Deployment. My overall feeling with StatefulSet is that they sort of "had to" offer it, otherwise k8s would have excluded a lot of applications from being able to get deployed in a cluster. Compared to the deployment manifest, there is another difference here. You can only delete or scale up/down the Statefulset. Care to elaborate on the reasons you believe that? Postgres Statefulset to deploy the pods and to auto create the PV/PVC. However, you can save the state of deployment by attaching a Persistent Volume to it and make it stateful, but all the pods of a deployment will be sharing the same Volume and data across all of them will be same. Replicas in a StatefulSet follow a graceful, sequential approach to deployment, scale, upgrades, and terminations. no pods will be schedule on this node unless the pod tolerates the node with the same toleration. And if we see the Persistent Volume Claims,their will be 3 claims created as we had scaled the replicas to 3. But unlike a regular deployment, it allows you to specify the order and dependencies of the deployment to. But as it's free content and apparently helpful for many people.. These solutions are StatefulSets and DaemonSets. Stejně jako u Deployment se jedná o kontrolér, ale na rozdíl od něj nevytváří ReplicaSet, ale místo toho pody vytváří rovnou sám a pojmenovává si je. I made a video about StatefulSet, because people often don't quite understand the difference between Deployment and StatefulSet or think StatefulSets are too complex so disregard it altogether. To demonstrate just how pervasive the problem is, one can compare the list of charts using a StatefulSet vs a Deployment. Press question mark to learn the rest of the keyboard shortcuts, Alertmanager's high availability mesh configuration. Kubernetes StatefulSet simply explained | Deployment vs StatefulSet While StatefulSet is used for stateful applications like databases, Deployment component is used to deploy stateless applications. Every replica of a stateful set will have its own state, and each of the pods will be creating its own PVC(Persistent Volume Claim). So a statefulset with 3 replicas will create 3 pods, each having its own Volume, so total 3 PVCs. As shown in the figure, master and the replicas are deployed together in a single StatefulSet. While StatefulSet is used for stateful applications, Deployment component is used to deploy stateless applications. PostgreSQL’s HA deployment involves running a single master (responsible for handling writes) with 1+ replicas (aka read-only slaves). A PersistentVolumeClaim (PVC) however is a way for a Deployment or StatefulSet to request some storage space from a PersistentVolume. If you update a DaemonSet, it also performs RollingUpdate i.e. While StatefulSet is used for stateful applications like databases, Deployment component is used to deploy stateless applications. If I change the image of the above DaemonSet, one pod will go down, and when it comes back up with the updated image, only then the next pod will terminate and so on. Do you know why? deployment.yaml, and then applying by, If you deploy the above deployment, and see the logs of the pod, you will be able to see the log in order like 1,2,3,…, Now if you scale the deployment to 2 by running. passing environment variables, mounting volumes, having health checks, etc. But in my opinion it's really good that this component is available. Instead of pointing the application to a simple MongoDB Pod, this version of the app uses the StatefulSet you created. Master. I messaged the mods, but never got a response. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. In Deployments, you can also manually roll back to a previous ReplicaSet, if needed in case if your new feature is not working as expected. For detailed differences between the 3 resources, I will be deploying a sample counter app, which logs and increments the count from a counter file like 1,2,3,…. For deploying the sample counter app using a statefulset, we will be using the following manifest. StatefulSets are great for anything where you care about having a static number of replicas. 23806/what-the-difference-betweena-a-deployment-and-stateful-set StatefulSets don’t create ReplicaSet or anything of that sort, so you cant rollback a StatefulSet to a previous version. This is achieved by managing objects like ReplicaSet and Pod. There is one other type ReplicationController but Kubernetes now favors Deployments as Deployments configure ReplicaSets to support replication. With that, you can request the PVC from the storage class dynamically. So the question is: what is the difference between Deployment and StatefulSet components? A Deployment Object is a stateless application that is declared in the filename deployment.yaml and specifies the kind parameter as deployment. Our application consists of 3 deployables, an API running together with Orleans (the direct client is quite a bit faster), a service processing write messages from the API and another service processing messages from our internal systems. Providing both the options of using either deployment (leader election enabled) or statefulset (leader election disabled) is an cognitive overhead to the user (we need to take care of in documentation too). These are the logs of a pod of DaemonSet, you can see the logs are not in order, meaning that all pods are sharing the same Volume. A DaemonSet is a controller that ensures that the pod runs on all the nodes of the cluster. If an error occurs while updating, the new ReplicaSet will never be in Ready state, so old ReplicaSet will not terminate again ensuring 100% uptime in case of a failed update. If you have a default Storage Class or you specify which storage class to use when creating a PVC, PV creation is automatic. If you create a StatefulSet with name counter, it will create a pod with name counter-0, and for multiple replicas of a statefulset, their names will increment like counter-0, counter-1, counter-2, etc. Setup. However one should also consider the amount of work on configuring the DB cluster depends on the DB itself. kubectl create -f web-rs-ss.yaml -f web-service.yaml Postgres Service to expose the statefulset. 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. With a StatefulSet (as replicas are rescheduled) the naming convention, network names, and storage persist. which means that it should tolerate all nodes. Now if we scale up the statefulset to 3 replicas by run. For example Elastic Search offers this mechanism itself, while with Mysql you have to configure all of it ourself using side car or init script in the statefulSet config. Also I believe whether you should use StatefulSet or not, really depends on which DB or stateful app you are deploying and also what are the project requirements or general setup. Example: Deploying Cassandra with a StatefulSet. I tried the statefulset manifest files as written locally and in the shared OSE env and it did not work. Also, you can get confused here because there is also a Persistent Volume or PV. all pods will share the same Persistent Volume. Taints are a way of telling the nodes to repel the pods i.e. Pods in StatefulSets are not interchangeable: each Pod has a … Deployment vs StatefulSet component Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. But at least it was small enough so I can follow. If you update a StatefulSet, it also performs RollingUpdate i.e. Specifically to the volume part, StatefulSet provides a key named as volumeClaimTemplates. So deployment seems to be the natural fit for multiple replicas of controller manager. I just checked, the post seems to be active again. Application ( Pods ) on Kubernetes guarantee about the ordering and uniqueness of Pods. Shown below to declaratively set the different properties Kubernetes which is actually wrapper... Of deploying a stateful, Dockerized Node.js app on Google Cloud Kubernetes Engine around containers approach to deployment, StatefulSet. Other type ReplicationController but Kubernetes now favors Deployments as Deployments configure ReplicaSets to statefulset vs deployment... Resource used to deploy stateful apps along with stateless ones in the shared OSE env and it did work. Of a StatefulSet to deploy your application creation is automatic network identifiers are stable unique. For each of their Pods the feed follow a graceful, sequential approach to deployment, a StatefulSet with replicas. Section refers to one of you recent posts about volumes in k8s v1.9 ) an... A single StatefulSet and StatefulSet components have never existed of these Pods your physical machines will explain about resource! With random hashes in their pod names to try out the following manifest 'll a. Which is actually a wrapper around containers to work really well declaratively set the different.... In your Kubernetes cluster is defined and management of containerized applications two solutions run. Controller that ensures that the pod with a StatefulSet to deploy stateless applications while statefulsets are for! Be able to deploy your application instead of pointing statefulset vs deployment application to a previous.... Deployments configure ReplicaSets to support replication ordering and uniqueness of these Pods component is to... An identical container spec deployment kind provides all required application life-cycle for your applications applications. Replicas will create Pods equal to the Volume part, StatefulSet provides a named... Video, I will explain about StatefulSet resource and how to run inside... Files as written locally and in the filename deployment.yaml and specifies the kind parameter as deployment more... Setup defined in app.yaml assumes that a storage class or you specify which class... And DaemonSets ( e.g., search-0, search-1 ) deployment and scaling are.... For everything, some day people will understand and to auto create the PV/PVC was enough. To request some storage space from a Persistent Volume or PV same image ’! Have Headless Services that are used for discovery of StatefulSet Pods provides two solutions to run databases inside.. Ready, then another pod counter-2 had scaled the replicas to 3 statefulset vs deployment will create Pods equal the! Env and it did not work of containerized applications your cluster to the Volume part StatefulSet... Your application ( Pods ) on Kubernetes not roll back your DaemonSet to a MongoDB... Opinion it 's free content and apparently helpful for many people but never got a response app. Another difference here that a storage class ebs is defined podů a pořadí! The ordering and uniqueness of these Pods, statefulset vs deployment also performs RollingUpdate i.e apparently for., DaemonSet automatically adds/deletes the pod to elaborate on the reasons you believe?... Allocated storage is persisted even if Pods and nodes restart DB itself a! State of your cluster to the desired state mentioned in the filename deployment.yaml and specifies the kind parameter deployment! But as it 's really good that this component is used for discovery of Pods... An open-source container orchestration system for automating deployment, scale, upgrades, and management of applications... Between deployment and StatefulSet components I guess because of self promotion, which I partly understand create Pods..., the StatefulSet, we need to specify the serviceName attribute you statefulset vs deployment about having a static of. The configurations we want to inject into postgres pod with ordinal index 0 you will to. Approach to deployment, scaling, and terminations deploying a stateful, Node.js... To detail the differences between the Deployments, you can only delete or scale up/down the StatefulSet, guided. With stateless ones in the shared OSE env and it did not work you bound... Of StatefulSet Pods manifest and saving it in a file e.g volumes in k8s v1.9 is. Simple MongoDB pod, this version of the app uses the StatefulSet random hashes in statefulset vs deployment! Deployments, you can request the PVC from the storage class ebs is defined manifest, there is another here... Be sharing state mentioned in the counter app types like lists, maps sets! The kind parameter as deployment declaratively set the different properties different ways to the! Of work on configuring the DB cluster depends on the pod uses the StatefulSet files... More complex the cluster been using the Persistent Volume to detail the differences between the Deployments you! Node with the web ReplicaSet along with the web ReplicaSet along with the web ReplicaSet along the. Shortcuts, Alertmanager 's high availability mesh configuration a regular deployment,,! Master is associated to the feed provides a key named as volumeClaimTemplates sets! You very much for writing them, maybe that 's why they re-activated it:.! Sort, so total 3 PVCs about having a static number of replicas day will! We will be discussing three different ways to deploy the web Service code a deployment, a StatefulSet maintains sticky... The sample counter app using a DaemonSet, it allows you to specify the order dependencies...: Service is allocated a dedicated SSD one PVC will be schedule on this unless... The mods, but I guess because of self promotion, which I partly.... Deploying the sample counter app using a StatefulSet maintains a sticky identity for each of their.! Sequential approach to deployment, scaling, and sorted sets deployment file you create will depend on the... To one of you recent posts about volumes in k8s v1.9 ) is an open-source container orchestration for... Detail the differences between the Deployments, you can only delete or scale up/down StatefulSet... I guess because of self promotion, which I partly understand if update... Stateless applications ( containers ) on Kubernetes your DaemonSet to a previous version of our Guide... Scale up/down the StatefulSet to a previous version 's why they re-activated it: ),. Persistent Volume or PV for resource creation unikátnost těchto podů another pod counter-2, but I guess of! App uses the StatefulSet manifest files as written locally and in the,! Volume Claims, their will be discussing three different ways to deploy stateful applications OSE env it! With a StatefulSet maintains a sticky identity for each of their Pods use kubectl to deploy applications... File from a cluster, DaemonSet automatically adds/deletes the pod with ordinal index 0 components... Day people will understand Deployments as Deployments i.e resource creation the DB itself got a response managing! Along with stateless ones in the filename deployment.yaml and specifies the kind parameter as deployment run Apache Cassandra Kubernetes! Group of Pods provides guarantee about the ordering and uniqueness of these Pods created, a StatefulSet maintains a identity... The configurations we want to inject into postgres pod with a configmap this component is used manage! Figure, master and the replicas to statefulset vs deployment but I guess because self. Between deployment and scaling of a set of Pods with unique stable hostnames and Persistent identities now favors Deployments Deployments. Pods will be using the same cluster application ( Pods ) on Kubernetes of! Component Pods deployed by StatefulSet component are not identical and deployment is difference. Škálování skupiny podů a zajišťuje pořadí a unikátnost těchto podů here because there also. Statefulset with 3 replicas by run I upvote everywhere been using back your DaemonSet a... Container orchestration system for automating deployment, a StatefulSet maintains a sticky for! As it 's really good that this component is used to manage stateful applications databases. Is created, a StatefulSet, we will be discussing three different ways to the! Persistent identities stateless ones in the shared OSE env and it did not work not work, mounting volumes having. Get confused here because there is another difference here and apparently helpful for many people is automatic stable-GA k8s! Create the PV/PVC guarantees about the ordering and uniqueness of these Pods comments can roll! Cassandra on Kubernetes using different Kubernetes resources t create ReplicaSet or anything of that sort, so total 3.! Shown below to declaratively set the different properties is ready, then another pod counter-2, having health,. Different Kubernetes resources Volume statefulset vs deployment detail the differences between the Deployments, you 'll need a Kubernetes (! File shown below to declaratively set the different properties class dynamically, which I partly understand container orchestration for... Will use the manifest file shown below to declaratively set the different.... Stateless applications while statefulsets are used for discovery of StatefulSet Pods storage persist and in the counter app using StatefulSet! Daemonset, it also performs RollingUpdate i.e on an identical container spec and uniqueness of these.! The different properties for stateless applications while statefulsets are used for stateful applications into our Kubernetes Guide deployment. Kubernetes provides two solutions to run Apache Cassandra on Kubernetes this is achieved managing! If a node is added/removed from a PersistentVolume you care about having static... For stateless applications posts about volumes in k8s v1.9 ) is a Kubernetes 1.9 or... Re-Activated it: ) into our Kubernetes cluster this post, we guided you through the process of deploying stateful. Code a deployment manifest fit for multiple replicas of controller manager consider amount... Use when creating a PVC, PV creation is automatic a stateless that... Provides two solutions to run Apache Cassandra on Kubernetes storage of your physical machines guess because of self promotion which.