Admin cluster configuration file

This page describes the fields in the admin cluster configuration file.

Generating a template for your configuration file

If you used gkeadm to create your admin workstation, then gkeadm generated a template for your admin cluster configuration file. Also, gkeadm filled in some of the fields for you.

If you did not use gkeadm to create your admin workstation, you can use gkectl to generate a template for your admin cluster configuration file.

To generate a template for your admin cluster configuration file:

gkectl create-config admin --config=[OUTPUT_FILENAME]

where [OUTPUT_FILENAME] is a path of your choice for the generated template. If you omit this flag, gkectl names the file admin-cluster.yaml and puts it in the current directory.

Filling in your configuration file

In your configuration file, enter field values as described in the following sections.

bundlePath

String. The path of your GKE on-prem bundle file.

The GKE on-prem full bundle file contains all of the components in a particular release of GKE on-prem. When you create an admin workstation, it comes with a full bundle at:

/var/lib/gke/bundles/gke-onprem-vsphere-[VERSION]-full.tgz

For example:

bundlePath: "/var/lib/gke/bundles/gke-onprem-vsphere-1.5.1-gke.8-full.tgz"

vCenter

This section holds information about your vCenter environment.

vCenter.address

String. The IP address or the hostname of your vCenter server.

Before you fill in the address field, download and inspect the serving certificate of your vCenter server. Enter the following command to download the certificate and save it to a file named vcenter.pem.

true | openssl s_client -connect [VCENTER_IP]:443 -showcerts 2>/dev/null | sed -ne '/-BEGIN/,/-END/p' > vcenter.pem

where [VCENTER_IP] is the IP address of your vCenter Server.

Open the certificate file to see the Subject Common Name and the Subject Alternative Name:

openssl x509 -in vcenter.pem -text -noout

The output shows the Subject Common Name (CN). This might be an IP address, or it might be a hostname. For example:

Subject: ... CN = 203.0.113.100
Subject: ... CN = my-vcenter-server.my-domain.example

The output might also include one or more DNS names under Subject Alternative Name:

X509v3 Subject Alternative Name:
    DNS:vcenter.my-domain.example

Choose the Subject Common Name or one of the DNS names under Subject Alternative Name to use as the value of vcenter.address in your configuration file. For example:

vCenter:
  address: "203.0.113.100"
vCenter:
  address: "my-vcenter-server.my-domain.example"

vCenter.datacenter

String. The name of your vCenter datacenter. For example:

vCenter:
  datacenter: "MY-DATACENTER"

vCenter.cluster

String. The name of your vCenter cluster. For example:

vCenter:
  cluster: "MY-CLUSTER"

vCenter.resourcePool

String. The name of your vCenter resource pool. For example:

If you are using a non-default resource pool, provide the name of your vCenter resource pool. For example:

vCenter:
  resourcePool: "MY-POOL"

If you are using the default resource pool, provide the following value:

vCenter:
  resourcePpool: "[VCENTER_CLUSTER]/Resources"

where [VCENTER_CLUSTER] is the name of your vCenter cluster.

vCenter.datastore

String. The name of your vCenter datastore. For example:

vCenter:
  datastore: "MY-DATASTORE"

See Specifying the root resource pool for a standalone host.

vCenter.caCertPath

String. When a client, like GKE on-prem, sends a request to your vCenter server, the server must prove its identity to the client by presenting a certificate or a certificate bundle. To verify the certificate or bundle, GKE on-prem must have the root certificate in the chain of trust.

Set vCenter.caCertPath to the path of the root certificate. For example:

vCenter:
  caCertPath: "/usr/local/google/home/me/certs/vcenter-ca-cert.pem"

Your VMware installation has a certificate authority (CA) that issues a certificate to your vCenter server. The root certificate in the chain of trust is a self-signed certificate created by VMware.

If you do not want to use the VMWare CA, which is the default, you can configure VMware to use a different certificate authority.

If your vCenter server uses a certificate issued by the default VMware CA, download the certificate as follows:

curl -k "https://[SERVER_ADDRESS]/certs/download.zip" > download.zip

where [SERVER_ADDRESS] is the address of your vCenter server.

Install the unzip command and unzip the certificate file:

sudo apt-get install unzip
unzip downloads.zip

If the unzip command doesn't work the first time, enter the command again.

Find the certificate file in certs/lin.

vCenter.credentials.fileRef.path

String. The path of a credentials configuration file that holds the username and password of your vCenter user account. The user account should have the Administrator role or equivalent privileges. See vSphere requirements. For example:

vCenter:
  credentials:
    fileRef:
      path: "my-config-folder/admin-creds.yaml"

vCenter.credentials.fileRef.entry

String. The name of the credentials block, in your credentials configuration file, that holds the username and password of your vCenter user account. For example:

vCenter:
  credentials:
    fileRef:
      entry: "vcenter-creds"

vCenter.dataDisk

String. GKE on-prem creates a virtual machine disk (VMDK) to hold Kubernetes object data. The installer creates the VMDK for you, but you must provide a name for the VMDK in the vCenter.dataDisk field. For example:

vCenter:
  dataDisk: "my-disk.vmdk"

network

This section holds information about your admin cluster network.

network.hostConfig

If you want to override certain values that are in your hostconfig files, fill in this section. Otherwise, remove this section.

The values you enter in this section override values that are in the hostconfig file for your admin cluster and the hostconfig file for the Seesaw load balancer of your admin cluster.

network.hostConfig.dnsServers

Array of strings. The addresses of DNS servers for the hosts to use. For example:

network:
  hostConifg:
    dnsServers:
    - "172.16.255.1"
    - "172.16.255.2"

network.hostConfig.ntpServers

Array of strings. The addresses of time servers for the hosts to use. For example:

network:
  hostConifg:
    ntpServers:
    - "216.239.35.0"

network.hostConfig.searchDomainsForDNS

Array of strings. DNS search domains for the hosts to use. These domains are used as part of a domain search list. For example:

network:
  hostConifg:
    searchDomainsForDNS:
    - "my.local.com"

network.ipMode.type

String. If you want your cluster nodes to get their IP address from a DHCP server, set this to "dhcp". If you want your cluster nodes to have static IP addresses chosen from a list that you provide, set this to "static". For example

network:
  ipMode:
    type: "static"

network.ipMode.ipBlockFilePath

If you set ipMode.type to "static", fill in this field.

If you set ipMode.type to "dhcp", remove this field.

String. The path of the hostconfig file for your admin cluster. For example:

network:
  ipMode:
    ipBlockFilePath: "/my-config-folder/admin-hostconfig.yaml"

network.serviceCIDR and network.podCiDR

Strings. The admin cluster must have a range of IP addresses to use for Services and a range of IP addresses to use for Pods. These ranges are specified by the network.serviceCIDR and network.podCIDR fields. These fields are populated with default values. If you like, you can change the populated values to values of your choice.

The Service and Pod ranges must not overlap. Also, the Service and Pod ranges must not overlap with IP addresses that are used for nodes in any cluster.

For example:

network:
  ...
  serviceCIDR: "10.96.232.0/24"
  podCIDR: "192.168.0.0/16"

network.vCenter.networkName

String. The name of the vSphere network for your cluster nodes.

If the name contains a special character, you must use an escape sequence for it.

Special characters Escape sequence
Slash (/) %2f
Backslash (\) %5c
Percent sign (%) %25

If the network name is not unique, it is possible to specify a path to the network, such as /DATACENTER/network/NETWORK_NAME.

For example:

network:
  vCenter:
    networkName: "MY-CLUSTER-NETWORK"

loadBalancer

This section holds information about the load balancer for your admin cluster.

loadBalancer.vips.controlPlaneVIP

String. The IP address that you have chosen to configure on the load balancer for the Kubernetes API server of the admin cluster. For example:

loadBalancer:
  vips:
    controlplaneVIP: "203.0.113.3"

loadBalancer.vips.addonsVIP

String. The IP address you have chosen to configure on the load balancer for add-ons. For example:

loadBalancer:
  vips:
    addonsVIP: "203.0.113.4"

loadBalancer.kind

String. Set this to "Seesaw", "F5BigIP", or "ManualLB" For example:

loadBalancer:
  kind: "Seesaw"

loadBalancer.manualLB

If you set loadbalancer.kind to "ManualLB", fill in this section. Otherwise, remove this section.

loadBalancer.manualLB.ingressHTTPNodePort

Remove this field from your configuration file. It is not used in an admin cluser.

loadBalancer.manualLB.ingressHTTPSNodePort

Remove this field from your configuration file. It is not used in an admin cluster.

loadBalancer.manualLB.controlPlaneNodePort

Integer. The Kubernetes API server in the admin cluster is implemented as a Service of type NodePort. You must choose a nodePort value for the Service.

Set this field to the nodePort value. For example:

loadBalancer:
  manualLB:
    contolPLaneNodePort: 30968

loadBalancer.manualLB.addonsNodePort

Integer. The add-ons server in the admin cluster is implemented as a Service of type NodePort. You must choose a nodePort value for the Service.

Set this field to the nodePort value. For example:

loadBalancer:
  manualLB:
    addonsNodePort: 31405

loadBalancer.f5BigIP

If you set loadbalancer.kind to "f5BigIP", fill in this section. Otherwise, remove this section.

loadBalancer.f5BigIP.address

String. The address of your F5 BIG-IP load balancer. For example:

loadBalancer:
  f5BigIP:
    address: "203.0.113.2"

loadBalancer.f5BigIP.fileRef.path

String. The path of a credentials configuration file that holds the username and password of an account that GKE on-prem can use to connect to your F5 BIG-IP load balancer. For example:

loadBalancer:
  f5BigIP:
    fileRef:
      path: ""my-config-folder/admin-creds.yaml"

loadBalancer.f5BigIP.fileRef.entry

String. The name of the credentials block, in your credentials configuration file, that holds the username and password of your F5 BIG-IP account. For example:

loadBalancer:
  f5BigIP:
    fileRef:
      entry: "f5-creds"

loadBalancer.f5BigIP.partition

String. The name of a BIG-IP partition that you created for your admin cluster. For example:

loadBalancer:
  f5BigIP:
    partition: "my-f5-admin-partition"

loadBalancer.f5BigIP.snatPoolName

String. If you are using SNAT, the name of your SNAT pool. If you are not using SNAT, remove this field. For example:

loadBalancer:
  f5BigIP:
    snatPoolName: "my-snat-pool"

loadBalancer.seesaw

If you set loadbalancer.kind to "Seesaw", fill in this section. Otherwise, remove this section.

loadBalancer.seesaw.ipBlockFilePath

String. Set this to the path of the hostconfig file for your Seesaw VMs. For example:

loadBalancer:
  seesaw:
    ipBlockFilePath: "admin-seesaw-hostconfig.yaml"

loadBalancer.seesaw.vird

Integer. The virtual router identifier of your Seesaw VM. This identifier must be unique in a VLAN. Valid range is 1-255. For example:

loadBalancer:
  seesaw:
    vrid: 125

loadBalancer.seesaw.masterIP

String. The VIP of your Seesaw VM or VM pair. For example:

loadBalancer:
  seesaw:
    masterIP: 172.16.20.21

loadBalancer.seesaw.cpus

Integer. The number of CPUs for your Seesaw VM. For example:

loadBalancer:
  seesaw:
    cpus: 8

loadBalancer.seesaw.memoryMB

Integer. The number of megabytes of memory for your Seesaw VM. For example:

loadBalancer:
  seesaw:
    memoryMB: 8192

loadBalancer.seesaw.vCenter.networkName

String. The name of the network that contains your Seesaw VMs. For example:

loadBalancer:
  seesaw:
    vCenter:
      networkName: "my-seesaw-network"

loadBalancer.seesaw.enableHA

Boolean. If you want to create a highly-available Seesaw load balancer, set this to true. Otherwise set this to false. For example:

loadBalancer:
  seesaw:
    enableHA: true

antiAffinityGroups.enabled

Boolean. Set this to true to enable DRS rule creation. Otherwise, set this to false. For example:

antiAffinityGroups:
  enabled true

GKE on-prem automatically creates VMware Distributed Resource Scheduler (DRS) anti-affinity rules for your admin cluster's nodes, causing them to be spread across at least three physical hosts in your datacenter.

This feature requires that your vSphere environment meets the following conditions:

  • VMware DRS is enabled. VMware DRS requires vSphere Enterprise Plus license edition.

  • Your vSphere user account has the Host.Inventory.Modify cluster privilege.

  • There are at least three physical hosts available.

Recall that if you have a vSphere Standard license, you cannot enable VMware DRS.

If you do not have DRS enabled, or if you do not have at least three hosts where vSphere VMs can be scheduled, set antiAffinityGroups.enabled to false.

proxy

If your network is behind a proxy server, fill in this section. Otherwise, remove this section.

proxy.url

String. The HTTP address of your proxy server. Include the port number even if it's the same as the scheme's default port. For example:

proxy:
  url: "http://my-proxy.example.local:80"

The proxy server you specify here is used by your GKE on-prem clusters. Also, your admin workstation is automatically configured to use this same proxy server unless you set the HTTPS_PROXY environment variable on your admin workstation.

If you specify proxy.url, you must also specify proxy.noProxy.

proxy.noProxy

String. A comma-separated list of IP addresses, IP address ranges, host names, and domain names that should not go through the proxy server. When GKE on-prem sends a request to one of these addresses, hosts, or domains, the request is sent directly. For example:

proxy:
  noProxy: "10.151.222.0/24, my-host.example.local,10.151.2.1"

privateRegistry

If you have a private Docker registry, fill in this section. Otherwise, remove this section.

privateRegistry.address

String. The IP address of the machine that runs your private Docker registry. For example:

privateRegistry:
  address: "203.0.113.10"

privateRegistry.credentials.fileRef.path

String. The path of a credentials configuration file that holds the username and password of an account that GKE on-prem can use to access your private Docker registry. For example:

privateRegistry:
  credentials:
    fileRef:
      path: "my-config-folder/admin-creds.yaml"

privateRegistry.credentials.fileRef.entry

String. The name of the credentials block, in your credentials configuration file, that holds the username and password of your private Docker registry account.

privateRegistry:
  credentials:
    fileRef:
      entry: "private-registry-creds"

privateRegistry.caCertPath

String. When Docker pulls an image from your private registry, the registry must prove its identity by presenting a certificate. The registry's certificate is signed by a certificate authority (CA). Docker uses the CA's certificate to validate the registry's certificate.

Set thie field to the path of the CA's certificate. For example:

privateRegistry:
  caCertPath: "my-cert-folder/registry-ca.crt"

gcrKeyPath

String. The path of the JSON key file for the service account you want to use for downloading GKE on-prem components. For example:

gcrKeyPath: "my-key-folder/access-key.json"

stackdriver

This section holds information about the project and service account that you want to use for storing logs and metrics.

stackdriver.projectID

String. The project ID of the Google Cloud project where you want to view logs. For example:

stackdriver:
  projectID: "my-logs-project"

stackdriver.clusterLocation

String. The Google Cloud region where you want to store logs. It is a good idea to choose a region that is near your on-prem data center. For example:

stackdriver:
  clusterLocation: "us-central1"

stackdriver.enableVPC

Boolean. If your cluster's network is controlled by a VPC, set this field to true. This ensures that all telemetry flows through Google's restricted IP addresses. Otherwise, set this field to false. For example:

stackdriver:
  enableVPC: false

stackdriver.serviceAccountKeyPath

String. The path of the JSON key file for your logging-monitoring service account. For example:

stackdriver:
  serviceAccountKeyPath: "my-key-folder/log-mon-key.json"

cloudAuditLogging

If you want to integrate the audit logs from your cluster's Kubernetes API server with Cloud Audit Logs, fill in this section. Otherwise, remove this section.

cloudAuditLogging.projectid

String. The project ID of the Google Cloud project where you want to view audit logs. For example:

cloudAuditLogging:
  projectid: "my-audit-project"

cloudAuditLogging.clusterlocation

String. The Google Cloud region where you want to store audit logs. It is a good idea to choose a region that is near your on-prem data center. For example:

cloudAuditLogging:
  clusterlocation: "us-central1"

cloudAuditLogging.serviceaccountkeypath

String. The path of the JSON key file for your audit-logging service account. For example:

cloudAuditLogging:
  serviceaccountkeypath: "my-key-folder/audit-log-key.json"

autoRepair.enabled

Boolean. Set this to true to enable node auto repair. Otherwise, set this to false. For example:

autoRepair:
  enabled: true