/// <summary>
/// Removes instances from the load balancer. Once the instance is deregistered, it will stop receiving traffic from the load balancer.
/// </summary>
/// <param name="loadBalancer">The name associated with the load balancer.</param>
/// <param name="instances">A list of instance IDs that should be deregistered with the load balancer.</param>
/// <param name="settings">The <see cref="LoadBalancingSettings"/> used during the request to AWS.</param>
/// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
public async Task <bool> DeregisterInstances(string loadBalancer, IList <string> instances, LoadBalancingSettings settings, CancellationToken cancellationToken = default(CancellationToken))
{
if (String.IsNullOrEmpty(loadBalancer))
{
throw new ArgumentNullException("loadBalancer");
}
if ((instances == null) || (instances.Count == 0))
{
throw new ArgumentNullException("instances");
}
//Create Request
AmazonElasticLoadBalancingClient client = this.CreateClient(settings);
DeregisterInstancesFromLoadBalancerRequest request = new DeregisterInstancesFromLoadBalancerRequest();
request.LoadBalancerName = loadBalancer;
foreach (string instance in instances)
{
request.Instances.Add(new Instance(instance));
}
//Check Response
DeregisterInstancesFromLoadBalancerResponse response = await client.DeregisterInstancesFromLoadBalancerAsync(request, cancellationToken);
if (response.HttpStatusCode == HttpStatusCode.OK)
{
_Log.Verbose("Successfully deregistered instances '{0}'", string.Join(",", instances));
return(true);
}
else
{
_Log.Error("Failed to deregister instances '{0}'", string.Join(",", instances));
return(false);
}
}