评估 DynamoDB 表的自动扩缩设置

在 Application Auto Scaling 中将您的 DynamoDB 表或 GSI 注册为可扩展目标。可扩展目标是 Application Auto Scaling 可以扩大或缩小的资源。

aws application-autoscaling register-scalable-target \
    --service-namespace dynamodb \
    --scalable-dimension dynamodb:table:WriteCapacityUnits \
    --resource-id table/<table-name> \
    --min-capacity 90 \
    --max-capacity 1500

根据您的要求设置预定操作。

我们需要两条规则来覆盖此场景：一条规则用来扩大，一条规则用来缩小。第一条规则扩大预定操作：

aws application-autoscaling put-scheduled-action \
    --service-namespace dynamodb \
    --scalable-dimension dynamodb:table:WriteCapacityUnits \
    --resource-id table/<table-name> \
    --scheduled-action-name my-8-5-scheduled-action \
    --scalable-target-action MinCapacity=800,MaxCapacity=1500 \
    --schedule "cron(45 8 ? * MON-FRI *)" \
    --timezone "Australia/Brisbane"

第二条规则缩小预定操作：

aws application-autoscaling put-scheduled-action \
    --service-namespace dynamodb \
    --scalable-dimension dynamodb:table:WriteCapacityUnits \
    --resource-id table/<table-name> \
    --scheduled-action-name my-5-8-scheduled-down-action \
    --scalable-target-action MinCapacity=90,MaxCapacity=1500 \
    --schedule "cron(15 17 ? * MON-FRI *)" \
    --timezone "Australia/Brisbane"

运行以下命令来验证两条规则是否已激活：

aws application-autoscaling describe-scheduled-actions --service-namespace dynamodb

应得到类似如下的结果：

{
    "ScheduledActions": [
        {
            "ScheduledActionName": "my-5-8-scheduled-down-action",
            "ScheduledActionARN": "arn:aws:autoscaling:<region>:<account>:scheduledAction:<uuid>:resource/dynamodb/table/<table-name>:scheduledActionName/my-5-8-scheduled-down-action",
            "ServiceNamespace": "dynamodb",
            "Schedule": "cron(15 17 ? * MON-FRI *)",
            "Timezone": "Australia/Brisbane",
            "ResourceId": "table/<table-name>",
            "ScalableDimension": "dynamodb:table:WriteCapacityUnits",
            "ScalableTargetAction": {
                "MinCapacity": 90,
                "MaxCapacity": 1500
            },
            "CreationTime": "2022-03-15T17:30:25.100000+10:00"
        },
        {
            "ScheduledActionName": "my-8-5-scheduled-action",
            "ScheduledActionARN": "arn:aws:autoscaling:<region>:<account>:scheduledAction:<uuid>:resource/dynamodb/table/<table-name>:scheduledActionName/my-8-5-scheduled-action",
            "ServiceNamespace": "dynamodb",
            "Schedule": "cron(45 8 ? * MON-FRI *)",
            "Timezone": "Australia/Brisbane",
            "ResourceId": "table/<table-name>",
            "ScalableDimension": "dynamodb:table:WriteCapacityUnits",
            "ScalableTargetAction": {
                "MinCapacity": 800,
                "MaxCapacity": 1500
            },
            "CreationTime": "2022-03-15T17:28:57.816000+10:00"
        }
    ]
}