第3章 Installing OpenShift Serverless
You are viewing documentation for a release of Red Hat OpenShift Serverless that is no longer supported. Red Hat OpenShift Serverless is currently supported on OpenShift Container Platform 4.3 and newer.
OpenShift Serverless is not tested or supported for installation in a restricted network environment.
3.1. Cluster size requirements
The cluster must be sized appropriately to ensure that OpenShift Serverless can run correctly. You can use the MachineSet API to manually scale your cluster up to the desired size.
An OpenShift cluster with 10 CPUs and 40 GB memory is the minimum requirement for getting started with your first serverless application. This usually means you must scale up one of the default MachineSets by two additional machines.
For this configuration, the requirements depend on the deployed applications. By default, each pod requests ~400m of CPU and recommendations are based on this value. In the given recommendation, an application can scale up to 10 replicas. Lowering the actual CPU request of the application further pushes the boundary.
The numbers given only relate to the pool of worker machines of the OpenShift cluster. Master nodes are not used for general scheduling and are omitted.
For more advanced use-cases, such as using OpenShift logging, monitoring, metering, and tracing, you must deploy more resources. Recommended requirements for such use-cases are 24 vCPUs and 96GB of memory.
Additional resources
For more information on using the MachineSet API, see Creating MachineSets.
3.1.1. Scaling a MachineSet manually
If you must add or remove an instance of a machine in a MachineSet, you can manually scale the MachineSet.
Prerequisites
-
Install an OpenShift Container Platform cluster and the
occommand line. -
Log in to
ocas a user withcluster-adminpermission.
Procedure
View the MachineSets that are in the cluster:
$ oc get machinesets -n openshift-machine-api
The MachineSets are listed in the form of
<clusterid>-worker-<aws-region-az>.Scale the MachineSet:
$ oc scale --replicas=2 machineset <machineset> -n openshift-machine-api
Or:
$ oc edit machineset <machineset> -n openshift-machine-api
You can scale the MachineSet up or down. It takes several minutes for the new machines to be available.
重要By default, the OpenShift Container Platform router pods are deployed on workers. Because the router is required to access some cluster resources, including the web console, do not scale the worker MachineSet to
0unless you first relocate the router pods.
