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Make CPU and memory reqs generic for hosted K8s installs #2996

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Catherine Luse
2021-02-09 10:12:57 -07:00
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content/rancher/v2.x/en/installation/requirements/_index.md
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@@ -12,9 +12,12 @@ Make sure the node(s) for the Rancher server fulfill the following requirements:
- [Operating Systems and Container Runtime Requirements](#operating-systems-and-container-runtime-requirements)
- [Hardware Requirements](#hardware-requirements)
- [CPU and Memory](#cpu-and-memory)
- [CPU and Memory for Rancher prior to v2.4.0](#cpu-and-memory-for-rancher-prior-to-v2-4-0)
- [Disks](#disks)
- [CPU and Memory](#cpu-and-memory)
- [RKE and Hosted Kubernetes](#rke-and-hosted-kubernetes)
- [K3s Kubernetes](#k3s-kubernetes)
- [RancherD](#rancherd)
- [Rancher prior to v2.4.0](#rancher-prior-to-v2-4-0)
- [Disks](#disks)
- [Networking Requirements](#networking-requirements)
- [Node IP Addresses](#node-ip-addresses)
- [Port Requirements](#port-requirements)
@@ -72,16 +75,17 @@ Docker is required for Helm chart installs, and it can be installed by following
Docker is not required for RancherD installs.
# Hardware Requirements
This section describes the CPU, memory, and disk requirements for the nodes where the Rancher server is installed.
The following sections describe the CPU, memory, and disk requirements for the nodes where the Rancher server is installed.
### CPU and Memory
# CPU and Memory
Hardware requirements scale based on the size of your Rancher deployment. Provision each individual node according to the requirements. The requirements are different depending on if you are installing Rancher in a single container with Docker, or if you are installing Rancher on a Kubernetes cluster.
{{% tabs %}}
{{% tab "RKE" %}}
### RKE and Hosted Kubernetes
These requirements apply to each host in an [RKE Kubernetes cluster where the Rancher server is installed.]({{<baseurl>}}/rancher/v2.x/en/installation/install-rancher-on-k8s/)
These CPU and memory requirements apply to each host in the Kubernetes cluster where the Rancher server is installed.
These requirements apply to RKE Kubernetes clusters, as well as to hosted Kubernetes clusters such as EKS.
Performance increased in Rancher v2.4.0. For the requirements of Rancher prior to v2.4.0, refer to [this section.](#cpu-and-memory-for-rancher-prior-to-v2-4-0)
@@ -94,11 +98,10 @@ Performance increased in Rancher v2.4.0. For the requirements of Rancher prior t
| XX-Large | Up to 2000 | Up to 20,000 | 32 | 128 GB |
[Contact Rancher](https://rancher.com/contact/) for more than 2000 clusters and/or 20,000 nodes.
{{% /tab %}}
{{% tab "K3s" %}}
### K3s Kubernetes
These requirements apply to each host in a [K3s Kubernetes cluster where the Rancher server is installed.]({{<baseurl>}}/rancher/v2.x/en/installation/install-rancher-on-k8s/)
These CPU and memory requirements apply to each host in a [K3s Kubernetes cluster where the Rancher server is installed.]({{<baseurl>}}/rancher/v2.x/en/installation/install-rancher-on-k8s/)
| Deployment Size | Clusters | Nodes | vCPUs | RAM | Database Size |
| --------------- | ---------- | ------------ | -------| ---------| ------------------------- |
@@ -110,37 +113,30 @@ These requirements apply to each host in a [K3s Kubernetes cluster where the Ran
[Contact Rancher](https://rancher.com/contact/) for more than 2000 clusters and/or 20,000 nodes.
{{% /tab %}}
{{% tab "RancherD" %}}
### RancherD
_RancherD is available as of v2.5.4. It is an experimental feature._
The following requirements apply to each instance with RancherD installed. Minimum recommendations are outlined here.
These CPU and memory requirements apply to each instance with RancherD installed. Minimum recommendations are outlined here.
| Deployment Size | Clusters | Nodes | vCPUs | RAM |
| --------------- | -------- | --------- | ----- | ---- |
| Small | Up to 5 | Up to 50 | 2 | 5 GB |
| Medium | Up to 15 | Up to 200 | 3 | 9 GB |
{{% /tab %}}
### Docker
{{% tab "Docker" %}}
These requirements apply to a host with a [single-node]({{<baseurl>}}/rancher/v2.x/en/installation/other-installation-methods/single-node-docker) installation of Rancher.
These CPU and memory requirements apply to a host with a [single-node]({{<baseurl>}}/rancher/v2.x/en/installation/other-installation-methods/single-node-docker) installation of Rancher.
| Deployment Size | Clusters | Nodes | vCPUs | RAM |
| --------------- | -------- | --------- | ----- | ---- |
| Small | Up to 5 | Up to 50 | 1 | 4 GB |
| Medium | Up to 15 | Up to 200 | 2 | 8 GB |
{{% /tab %}}
{{% /tabs %}}
### CPU and Memory for Rancher prior to v2.4.0
### Rancher prior to v2.4.0
{{% accordion label="Click to expand" %}}
These requirements apply to installing Rancher on an RKE Kubernetes cluster prior to Rancher v2.4.0:
These CPU and memory requirements apply to installing Rancher on an RKE Kubernetes cluster prior to Rancher v2.4.0:
| Deployment Size | Clusters | Nodes | vCPUs | RAM |
| --------------- | --------- | ---------- | ----------------------------------------------- | ----------------------------------------------- |
@@ -151,7 +147,7 @@ These requirements apply to installing Rancher on an RKE Kubernetes cluster prio
| XX-Large | 100+ | 1000+ | [Contact Rancher](https://rancher.com/contact/) | [Contact Rancher](https://rancher.com/contact/) |
{{% /accordion %}}
### Disks
# Disks
Rancher performance depends on etcd in the cluster performance. To ensure optimal speed, we recommend always using SSD disks to back your Rancher management Kubernetes cluster. On cloud providers, you will also want to use the minimum size that allows the maximum IOPS. In larger clusters, consider using dedicated storage devices for etcd data and wal directories.