How do we know if AWS Fargate spot instance is available?-CodePudding

I'm using below code to launch fargate instances, here I've a doubt what if fargate spot instance not available, does it launch an normal instance by default or raise an exception ??

I went through boto3 docs, I'm not not able to find it.

import boto3

ecs_client = boto3.client('ecs')

# Set the parameters for the task
cluster_name = 'my-cluster'
task_definition = 'my-def'
capacity_provider = 'FARGATE_SPOT'

# Launch the task
response = ecs_client.run_task(
    cluster=cluster_name,
    taskDefinition=task_definition,
    capacityProviderStrategy=[
        {
            "capacityProvider": capacity_provider
        }
    ],
    networkConfiguration={
        'awsvpcConfiguration': {
            'subnets': [
                'subnet-001',
            ],
            'securityGroups': [
                'sg-001',
            ],
            'assignPublicIp': 'ENABLED'
        }
    },
)

CodePudding user response：

No, it will not switch to on-demand instance on FARGATE and you will not get any raise exception. You can only see it on service metrics spot capacity not available.

Solution is to combine FARGATE and FARGATE_SPOT together with weight.

capacityProviderStrategy=[
        {
            'capacityProvider': 'FARGATE_SPOT',
            'weight': 4
        },
        {
            'capacityProvider': 'FARGATE',
            'weight': 1
        },
    ]

20% on FARGATE and 80% on FARGATE_SPOT