Updating the condition of an existing node on a Cloud Load Balancer

lb-update-condition.js

// Updating the condition of an existing load balancer node with pkgcloud.

var pkgcloud = require('pkgcloud');

var client = pkgcloud.loadbalancer.createClient({
  provider: 'rackspace',
  username: process.env.RACKSPACE_USERNAME,
  apiKey: process.env.RACKSPACE_APIKEY,
  region: process.env.RACKSPACE_REGION
});

var lbName = process.env.CLB_NAME;
var serverAddr = process.env.CLB_SERVER_ADDR;

// 1. Find the load balancer you wish to update.
client.getLoadBalancers(function (err, lbs) {
  if (err) {
    console.error("Unable to list load balancers.");
    console.error(err);
    return;
  }

  var lb;
  lbs.forEach(function (each) {
    if (each.name === lbName) {
      lb = each;
    }
  });

  if (!lb) {
    console.error("Unable to find the load balancer.");
    return;
  }

  console.log("Found load balancer: %s", lb.name);

  // 2. Find the node that you wish to update.
  lb.getNodes(function (err, nodes) {
    if (err) {
      console.error("Unable to list the load balancer's nodes.");
      console.error(err);
      return;
    }

    var node;
    nodes.forEach(function (each) {
      if (each.address === serverAddr) {
        node = each;
      }
    });

    if (!node) {
      console.error("Unable to locate the server's node.");
      console.error(err);
      return;
    }

    console.log("Found node for server: %s", node.address);

    // 3. Update the node's condition.
    node.condition = 'DRAINING';
    lb.updateNode(node, function (err) {
      if (err) {
        console.error("Unable to update the node's condition.");
        console.error(err);
        return;
      }

      // 4. Wait for the load balancer to become mutable again.
      // Necessary before you can perform any other modifications to this load balancer.
      lb.setWait({status: 'ACTIVE'}, 2500, function (err) {
        if (err) {
          console.error(err);
          return;
        }

        console.log("Successfully updated the node's condition to draining.");
      })
    })
  });

});