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.

apiVersion: v1
kind: AdminCluster
# (Required) Absolute path to a GKE bundle on disk
bundlePath: ""
# (Required) vCenter configuration
vCenter:
  address: ""
  datacenter: ""
  cluster: ""
  resourcePool: ""
  datastore: ""
  # Provide the path to vCenter CA certificate pub key for SSL verification
  caCertPath: ""
  # The credentials and address to connect to vCenter
  credentials:
    username: ""
    password: ""
  # Provide the name for the persistent disk to be used by the deployment (ending
  # in .vmdk). Any directory in the supplied path must be created before deployment
  dataDisk: ""
# (Required) Network configuration
network:
  ipMode:
    # (Required) Define what IP mode to use ("dhcp" or "static")
    type: dhcp
    # # (Required when using "static" mode) The absolute or relative path to the yaml file
    # # to use for static IP allocation
    # ipBlockFilePath: ""
  # (Required) The Kubernetes service CIDR range for the cluster. Must not overlap
  # with the pod CIDR range
  serviceCIDR: 10.96.232.0/24
  # (Required) The Kubernetes pod CIDR range for the cluster. Must not overlap with
  # the service CIDR range
  podCIDR: 192.168.0.0/16
  vCenter:
    # vSphere network name
    networkName: ""
# (Required) Load balancer configuration
loadBalancer:
  # (Required) The VIPs to use for load balancing
  vips:
    # Used to connect to the Kubernetes API
    controlPlaneVIP: ""
    # # (Optional) Used for admin cluster addons (needed for multi cluster features). Must
    # # be the same across clusters
    # addonsVIP: ""
  # (Required) Which load balancer to use "F5BigIP" "Seesaw" or "ManualLB". Uncomment
  # the corresponding field below to provide the detailed spec
  kind: Seesaw
  # # (Required when using "ManualLB" kind) Specify pre-defined nodeports
  # manualLB:
  #   ingressHTTPNodePort: 32527
  #   ingressHTTPSNodePort: 30139
  #   controlPlaneNodePort: 30968
  #   addonsNodePort: 31405
  # # (Required when using "F5BigIP" kind) Specify the already-existing partition and
  # # credentials
  # f5BigIP:
  #   address: ""
  #   credentials:
  #     username: ""
  #     password: ""
  #   partition: ""
  #   # # (Optional) Specify a pool name if using SNAT
  #   # snatPoolName: ""
  # (Required when using "Seesaw" kind) Specify the Seesaw configs
  seesaw:
    # (Required) The absolute or relative path to the yaml file to use for IP allocation
    # for LB VMs. Must contain one or two IPs.
    ipBlockFilePath: ""
    # (Required) The Virtual Router IDentifier of VRRP for the Seesaw group. Must
    # be between 1-255 and unique in a VLAN.
    vrid: 0
    # (Required) The IP announced by the master of Seesaw group
    masterIP: ""
    # (Required) The number CPUs per machine
    cpus: 2
    # (Required) Memory size in MB per machine
    memoryMB: 3072
    # (Optional) Network that the LB interface of Seesaw runs in (default: cluster
    # network)
    vCenter:
      # vSphere network name
      networkName: ""
    # (Optional) Run two LB VMs to achieve high availability (default: false)
    enableHA: false
# (Optional) Specify the proxy configuration
proxy:
  # The URL of the proxy
  url: ""
  # The domains and IP addresses excluded from proxying
  noProxy: ""
# # (Optional) Use a private Docker registry to host GKE images
# privateRegistry:
#   # Do not include the scheme with your registry address
#   address: ""
#   credentials:
#     username: ""
#     password: ""
#   # The absolute or relative path to the CA certificate for this registry
#   caCertPath: ""
# (Required): The absolute or relative path to the GCP service account key for pulling
# GKE images
gcrKeyPath: ""
# (Optional) Specify which GCP project to connect your logs and metrics to
stackdriver:
  projectID: ""
  # A GCP region where you would like to store logs and metrics for this cluster.
  clusterLocation: ""
  enableVPC: false
  # The absolute or relative path to the key file for a GCP service account used to
  # send logs and metrics from the cluster
  serviceAccountKeyPath: ""
# # (Optional) Configure kubernetes apiserver audit logging
# cloudAuditLogging:
#   projectid: ""
#   # A GCP region where you would like to store audit logs for this cluster.
#   clusterlocation: ""
#   # The absolute or relative path to the key file for a GCP service account used to
#   # send audit logs from the cluster
#   serviceaccountkeypath: ""

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-1.4.3-gke.3-full.tgz"

vCenter

This section holds information about your vSphere 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.credentials.username

String. A vCenter Server user account. The user account should have the Administrator role or equivalent privileges. See vSphere requirements.

For example:

vCenter:
  credentials:
    username: "my-account@vsphere.local"

vCenter.credentials.password

String. The password for the vCenter Server user account. For example:

vCenter:
  credentials:
    password: "#STyZ2T#Ko2o"

vCenter.datastore

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

vCenter:
  datastore: "MY-DATASTORE"

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:
  resourcePool: "[VCENTER_CLUSTER]/Resources"

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

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.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.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.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.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"

network.ipBlockFilePath {:#network-ipblockfilepath-field}`

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

If you set ipMode.type to "dhcp", remove this field or leave it commented out.

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

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

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 or leave it commented out.

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 or leave it commented out.

loadBalancer.f5BigIP.address

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

loadBalancer:
  f5BigIP:
    address: "203.0.113.2"

loadBalancer.f5BigIP.credentials.username

String. The username of an account that GKE on-prem can use to connect to your F5 BIG-IP load balancer. For example:

loadBalancer:
  f5BigIP:
    credentials:
      username: "my-admin-f5-name"

loadBalancer.f5BigIP.credentials.password

String. The password that GKE on-prem can use to connect to your F5 BIG-IP load balancer. For example:

loadBalancer:
  f5BigIP:
    credentials:
      password: "rJDlm^%7aOzw"

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 or leave it commented out. 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 or leave it commented out.

loadBalancer.seesaw.ipBlockFilePath

String. Set this to the path of the hostconfig file for your Seesaw VM. 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

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 or leave it commented out.

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.username

String. The username of an account that GKE on-prem can use to access your private Docker registry. For example:

privateRegistry:
  credentials:
    username: "my-registry-account"

privateRegistry.credentials.password

String. The password for the account that GKE on-prem can use to access your private Docker registry. For example:

privateRegistry:
  credentials:
    password: "H0!%fwH0rBnh"

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 your allowlisted service account. For example:

gcrKeyPath: "my-key-folder/whitelisted-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 or leave it commented out.

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"