Using Compute Profiles (vSphere)
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This topic describes how to use compute profiles for Linux- and Windows-based Kubernetes clusters on vSphere with NSX-T networking and for Linux-based Kubernetes clusters on vSphere without NSX-T networking.
Compute profiles let you customize cluster resources parameters.
TKGI cluster administrators can create and delete compute profiles, as described in the Creating and Managing Compute Profiles with the CLI (vSphere) topic.
After an administrator creates a compute profile, cluster managers (
pks.cluster.manage) can create clusters with it or assign it to existing clusters.
To list available compute profiles, run the following command:
$ tkgi compute-profiles Name Description custom-nodes-compute-profile custom-nodes-compute-profile custom-node-pools-compute-profile custom-node-pools-compute-profile Dc-east-single-node-pool A profile for the east datacenter with a single node pool dc-east-mixed A profile for the east datacenter with heterogeneous workers
You can assign a compute profile to a Kubernetes cluster at the time of cluster creation.
To create an TKGI-provisioned Kubernetes cluster with a compute profile, run the following command:
tkgi create-cluster CLUSTER-NAME --external-hostname HOSTNAME --plan PLAN-NAME --compute-profile COMPUTE-PROFILE-NAME --node-pool-instances "NODE-POOL-NAME:INSTANCES"
CLUSTER-NAMEis a unique name for your cluster.
Note: Use only lowercase characters when naming your cluster if you manage your clusters with Tanzu Mission Control (TMC). Clusters with names that include an uppercase character cannot be attached to TMC.
HOSTNAMEis your external hostname used for accessing the Kubernetes API.
PLAN-NAMEis the name of the TKGI plan you want to use for your cluster.
COMPUTE-PROFILE-NAMEis the name of the compute profile you want to use for your cluster.
--node-pool-instancesoverrides the worker node instance counts specified in the compute profile:
NODE-POOL-NAMEis the name of the node pool you want to specify the number of worker node instances for.
INSTANCESis the number of worker nodes for the node pool name specified as
tkgi create-cluster custom-node-pools -e test.tkgi.shep.api.com --compute-profile custom-node-pools-compute-profile -p "small" --node-pool-instances "tiny-1:3" TKGI Version: 1.9.0-build.11 Name: test K8s Version: 1.18.5 Plan Name: small UUID:
1 Last Action: CREATE Last Action State: in progress Last Action Description: Creating cluster Kubernetes Master Host: test.tkgi.shep.api.com Kubernetes Master Port: 8443 Worker Nodes: 4 Kubernetes Master IP(s): In Progress Network Profile Name: Kubernetes Profile Name: Compute Profile Name: custom-node-pools-compute-profile Tags:
TKGI supports changing the compute profile for an already created cluster. You can use this procedure to:
- assign a compute profile to a cluster that does not have one, or
- change a cluster’s existing profile to a new one
Note: Compute profiles do not support moving a cluster’s nodes to different Availability Zones.
Warning: Do not scale out or scale in existing master nodes by reconfiguring the TKGI tile or by using a compute profile. Reducing a cluster’s number of control plane nodes may remove a master node and cause the cluster to become inactive.
This is the procedure to change a cluster’s compute profile:
Do one of the following
- Choose a new compute profile for the cluster. See List Compute Profiles.
- Have a TKGI cluster administrator define and create a new compute profile as described in Create a Compute Profile in Creating and Managing Compute Profiles with the CLI (vSphere).
- The name of the new compute profile must be unique and different from the previously assigned compute profile.
Run the following command to update the cluster with the new compute profile:
tkgi update-cluster CLUSTER-NAME --compute-profile NEW-COMPUTE-PROFILE-NAME ---node-pool-instances "NODE-POOL-NAME:INSTANCES"
CLUSTER-NAMEis the name of the existing Kubernetes cluster
NEW-COMPUTE-PROFILE-NAMEis the name of the new compute profile you want to apply to the cluster.
--node-pool-instances "NODE-POOL-NAME:INSTANCES"updates the number of worker nodes for node pool
NODE-POOL-NAMEshould be the name of the node pool in the new compute profile.
tkgi update-cluster test --compute-profile new-compute-profile Update summary for cluster test: Compute Profile Name: new-compute-profile Are you sure you want to continue? (y/n): y Use 'tkgi cluster test' to monitor the state of your cluster
There are strict validation rules for the
tkgi update-cluster --compute-profile command:
- You cannot use the compute profile to change Availability Zones of a cluster.
- If any optional field is unspecified at the time of cluster creation or cluster update, then the value of that field is set to the value of the corresponding field from the plan.
- Values passed to
- Values passed to
--node-pool-instancesmust match the labels of the node pools specified in the compute profile.
Clusters created with compute profile in TKGI 1.8 and earlier:
- You cannot update a compute profile for a cluster that already has an associated profile created in TKGI v1.8 or earlier.
TKGI supports using the CLI to resize a cluster already created or assigned with a compute profile, without having to create a new compute profile.
To do this, run the
tkgi update-cluster command with the
Pass in a comma-separated list that associates node pools defined in the compute profile with new instance counts.
This changes the number of instances from each node pool.
The node pools must already be defined in the cluster’s compute profile.
For example, to resize a cluster
custom-node-pools-cluster to use three nodes from the node pool named
tiny-1 and seven from the pool named
tkgi update-cluster custom-node-pools-cluster --node-pool-instances "tiny-1:3,medium-2:7"
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