![]() This backup includes all the deployments, secrets, and configmaps for the cluster. Etcd backups are used to back up the state of the Kubernetes cluster. Snapshots of the etcd database can be taken and saved locally or to S3. You can either follow these Docker installation instructions or use Rancher's install scripts. In this example, we'll be making a standard three-node with all nodes running all roles. They can also be clusters that are built outside Rancher then imported. Building a D ownstream C lusterĭownstream clusters in Rancher are RKE/RKE2/K3s clusters that Rancher manages for you. The DNS record for the Rancher URL should be pointed at the load balancer.įor more details, please see Rancher's documentation. To provide a HA setup for Rancher, we'll want to create a Layer-4 (TCP mode) or Layer-7 (HTTP mode) load balancer for ports 80 and 443 sitting in front of and forwards traffic to all nodes in the cluster. Configuring the F ront- E nd L oad B alancer for HA In single-node mode, DNS is optional, and the node IP/Hostname can be used in place of the Rancher URL. Helm install rancher rancher-latest/rancher -namespace cattle-system -set hostname= To make access more manageable, we'll want to copy this file to kubectl 's config directory. RKE will also create the file kube_config_cluster.yml this file is used by kubectl to access the cluster. Once these steps are done, RKE will create the file cluster.rkestate this file contains credentials and the current state of the cluster. ![]() Create the worker plane and join all the nodes to the cluster.Create the control plane, which includes kube-apiserver, kube -controller-manager, and kube -scheduler.Create the etcd plane and config all the etcd -related services.Generate SSL certificates for all the different Kubernetes components.Create an SSH tunnel to each node for Docker CLI access.Creating the C lusterĪfter creating the cluster.yml, we need to run the command rke to build the cluster using the following steps: Nodes can support multiple roles, and in the default Rancher configuration, we'll be building a three-node cluster with all nodes running all roles.įor more examples, check out the Rancher documentation. The final role is the worker plane, which hosts your applications and related services. Note: The control plane doesn't scale horizontally very well and scales more vertically. The second role being the control plane, which hosts the Kubernetes controllers and other related management services, should be deployed in a HA configuration with a minimum of two nodes. With three different roles that a node can have, the first is the etcd plane, the database for Kubernetes, and this role should be deployed in a HA configuration with an odd number of nodes and the default size of three nodes.Ī five-member etcd cluster is the largest recommended size due to write performance suffering at scale. RKE uses a cluster.yml file to define the nodes in the cluster and what roles each node should have. You can either follow the Docker installation instructions or use Rancher's install scripts to install Docker.Ĭurl -LO $(curl -L -s )/bin/linux/amd64/kubectlĬreating the Cluster Config Configuration Three Linux nodes with the following minimum specs: K3s have also been built to support ARM64 and ARMv7 nodes fully, so they can even be ran on a Raspberry Pi. It is designed to run resource-constrained, remote locations, or inside IoT appliances. This includes etcd, traefik, and all Kubernetes components. All duplicate, redundant, and legacy code is removed and baked into a single binary that is less than 40MB and contains everything needed to run a Kubernetes cluster. K3s is a lightweight certified Kubernetes distribution. As long as you can run a supported Docker version, you can deploy and run Kubernetes with RKE. It solves the common frustration of installation complexity with Kubernetes by removing most host dependencies and presenting a stable path for deployment, upgrades, and rollbacks. RKE is a CNCF-certified Kubernetes distribution that runs entirely within Docker containers. RKE is mainly used in more traditional data centers and cloud deployments, and K3s are primarily used in more edge and developer laptop deployments. Rancher is primarily deployed on two types of clusters, RKE and K3s. He Rancher server is built on Kubernetes and runs as an application on any certified Kubernetes cluster, and, of course, Rancher is 100% open source with no license keys. Providing the primary controller for managing downstream clusters, the Rancher server also provides access to your downstream clusters in a standardized web UI and API.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |