GKE REST/Node API 调用以获取池中的节点数？

Question

How can I get the current size of a GKE node pool using the REST (or Node) API ?

I'm managing my own worker pool using my Express app running on my cluster, and can set the size of the pool and track the success of the setSize operation, but I see no API for getting the current node count. The NodePool resource only includes the original node count, not the current count. I don't want to use gcloud or kubectl on one of my production VMs.

I could go around GKE and try to infer the size using the Compute Engine (GCE) API, but I haven't looked into that approach yet. Note that it seems difficult to get the node count even from Stack Driver . Has anyone found any workarounds to get the current node size?

Answer 1

The worker pool size can be retrieved from the Compute Engine API by getting the instance group associated with the node pool.

const { google } = require('googleapis')
const Compute = require('@google-cloud/compute')

const container = google.container('v1')
const compute = new Compute()

const projectId = 'project-12345'
const zone = 'us-central1-a'
const nodePoolId = 'worker-pool'
const clusterId = 'cluster-name'

async function authorize() {
  const auth = new google.auth.GoogleAuth({
    scopes: [ 'https://www.googleapis.com/auth/cloud-platform' ],
  })
  return auth.getClient()
}

const getNodePoolSize = async () => {
  const auth = await authorize()
  const clusterName = `projects/${projectId}/zones/${zone}/clusters/${clusterId}`
  const request = { name: clusterName, auth }
  const response = await container.projects.locations.clusters.get(request)
  const nodePool = response.data.nodePools.find(({ name }) => name === nodePoolId)
  const igName = nodePool.instanceGroupUrls[0].match(/.*\/instanceGroupManagers\/([a-z0-9-]*)$/)[1]
  const instanceGroup = await compute.zone(zone).instanceGroup(igName).get()
  return instanceGroup[1 /* 0 is config, 1 is instance */].size
}

Note that this is using two different Node API mechanisms. We could use google.compute instead of @google-cloud/compute . Also, the two APIs are authenticated differently. The former uses the authorize() method to get a client, while the latter is authenticated via the default account set in environment variables.