In future versions of Rancher you will have the choice to install RKE, K3S or RKE2. Rancher will always install RKE Kubernetes on the nodes. This is possible for local clusters, on-premise clusters, edge clusters and cloud clusters. If Rancher installed himself Kubernetes on the nodes, it is full aware of etcd (the cluster configuration database) in the downstream cluster and can manage backups and restore of the etcd and also updates for Kubernetes. Clusters that had already installed Kubernetes on the nodes and where imported into Rancher management afterwards.Clusters where Rancher installed Kubernetes on the nodes. You can distinguish between two main forms of downstream clusters: The Cluster Agent and the Node Agents in the downstream cluster need to be able to reach the Cluster Controllers in the Rancher cluster. This agents open a tunnel connection to the Rancher server so that the Rancher server is able to manage the downstream cluster. One Cluster Agent in the downstream cluster and on every node in the downstream cluster a node agent. This downstream clusters can be local, on premise, edge or cloud.Ī downstream cluster has 2 components installed: Ranchers purpose is to manage so called downstream clusters. So we leave the local cluster now as it is. If you have a security breach here, all your clusters are affected! Just use this cluster to manage your other Kubernetes clusters.Īnd the worst idea is to install workloads in the local cluster and manage with Rancher other clusters! Imagine, the local cluster has full access to the other clusters. Theoretically you can install already workloads here and that’s all, and for testing this is OK.īut in production enterprise platforms you should not do this. This cluster will be always shown, it represents the cluster that hosts Rancher, our management cluster. The local clusterĪfter we logged in into the Rancher Webgui, we can see already in the left top our Rancher managed clusters. Each of the sections below list the ports that need to be opened for different cluster creation options.įor a breakdown of the port requirements for etcd nodes, controlplane nodes, and worker nodes in a Kubernetes cluster, refer to the port requirements for the Rancher Kubernetes Engine.ĭetails on which ports are used in each situation are found under Downstream Cluster Port Requirements.In the last part of our blog we installed successfully Rancher into our single node K3S Kubernetes cluster. The ports required to be open are different depending on how the user cluster is launched. Networking Requirements įor a production cluster, we recommend that you restrict traffic by opening only the ports defined in the port requirements below. Regarding CPU and memory, it is recommended that the different planes of Kubernetes clusters (etcd, controlplane, and workers) should be hosted on different nodes so that they can scale separately from each other.įor hardware recommendations for large Kubernetes clusters, refer to the official Kubernetes documentation on building large clusters.įor hardware recommendations for etcd clusters in production, refer to the official etcd documentation. The minimum to run the Kubernetes node components is 1 CPU (core) and 1GB of memory. The hardware requirements for nodes with the worker role mostly depend on your workloads. See Configuring Custom Clusters for Windows Hardware Requirements Windows nodes can be used for worker nodes only. Nodes with Windows Server must run Docker Enterprise Edition. The Docker service is enabled automatically when using Node Drivers. For Kubernetes 1.19, firewalld must be turned off. Some distributions of Linux derived from RHEL, including Oracle Linux, may have default firewall rules that block communication with Helm. Oracle Linux and RHEL Derived Linux Nodes If you plan to use ARM64, see Running on ARM64 (Experimental).įor information on how to install Docker, refer to the official Docker documentation. Worker nodes may run Linux or Windows Server.įor details on which OS and Docker versions were tested with each Rancher version, refer to the support maintenance terms.Īll supported operating systems are 64-bit x86. Linux is required for the etcd and controlplane nodes of all downstream clusters. Rancher should work with any modern Linux distribution and any modern Docker version. Operating Systems and Container Runtime Requirements For Rancher installation requirements, refer to the node requirements in the installation section. If Rancher is installed on a high-availability Kubernetes cluster, the Rancher server three-node cluster and downstream clusters have different requirements.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |