An example of the GCPInstanceClasscustom resource

Below is a simple example of custom resource GCPInstanceClass configuration:

kind: GCPInstanceClass
  name: test
  machineType: n1-standard-1

Configuring security policies on nodes

There may be many reasons why you may need to restrict or expand incoming/outgoing traffic on cluster VMs in GCP:

  • Allow VMs on a different subnet to connect to cluster nodes.
  • Allow connecting to the ports of the static node so that the application can work.
  • Restrict access to external resources or other VMs in the cloud for security reasons.

For all this, additional network tags should be used.

Enabling additional network tags on static and master nodes

This parameter can be set either in an existing cluster or when creating one. In both cases, additional network tags are declared in the GCPClusterConfiguration:

  • for master nodes, in the additionalNetworkTags field of the masterNodeGroup section;
  • for static nodes, in the additionalNetworkTags field of the nodeGroups subsection that corresponds to the target nodeGroup.

The additionalNetworkTags field contains an array of strings with network tags names.

Enabling additional network tags on ephemeral nodes

You have to set the additionalNetworkTags parameter for all GCPInstanceClass that require additional network tags.