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bwhaley/gist:7383803e1dec6bff2ea05d8af634d5cb

Created December 4, 2019 06:34
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rolling deployment method
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gistfile1.txt
"""Put ECS Instances in DRAINING state so that all ECS Tasks running on them are migrated to other Instances.
Batches into chunks of 10 because of AWS api limitations (An error occurred InvalidParameterException when
calling the UpdateContainerInstancesState operation: instanceIds can have at most 10 items)
"""
def put_container_instances_in_draining_state(ecs_client, cluster_name, container_instance_arns):
batch_size = 10
n_batches = math.ceil(len(container_instance_arns)/batch_size)
for i in range(0, len(container_instance_arns), batch_size):
logger.info('Putting batch %d/%d of container instances %s in cluster %s into DRAINING state', i+1, n_batches, container_instance_arns, cluster_name)
ecs_client.update_container_instances_state(cluster=cluster_name, containerInstances=container_instance_arns[i:i + batch_size], status='DRAINING')
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