1. 在CloudFormation模板中设置Stickiness Policies：

"LoadBalancer": {
    "Type": "AWS::ElasticLoadBalancingV2::LoadBalancer",
    "Properties": {
        "Name": "example-lb",
        "Type": "application",
        "Scheme": "internet-facing",
        "IpAddressType": "ipv4",
        "SecurityGroups": ["sg-XXXXXXX"],
        "Subnets": ["subnet-XXXXXXX", "subnet-XXXXXXX"],
        "LoadBalancerAttributes": [
            {
                "Key": "load_balancing.cross_zone.enabled",
                "Value": "true"
            }
        ],
        "Tags": [
            {
                "Key": "Name",
                "Value": "example-lb"
            }
        ],
        "Listeners": [
            {
                "Port": "80",
                "Protocol": "HTTP",
                "DefaultActions": [
                    {
                        "Type": "forward",
                        "TargetGroupArn": {"Ref" : "TargetGroup"}
                    }
                ]
            }
        ]
    }
},
"TargetGroup": {
    "Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
    "Properties": {
        "Name": "example-tg",
        "Port": "80",
        "Protocol": "HTTP",
        "VpcId": "vpc-XXXXXXX",
        "TargetType": "instance",
        "HealthCheckIntervalSeconds": 30,
        "HealthCheckProtocol": "HTTP",
        "HealthyThresholdCount": 2,
        "UnhealthyThresholdCount": 2,
        "HealthCheckPath": "/health-check",
        "Matcher": {
            "HttpCode": "200"
        },
        "StickinessEnabled": true,
        "StickinessType": "lb_cookie",
        "StickinessLBCookieDurationSeconds": 604800
    }
}

2. 确认DNS名称已更新：

aws cloudformation describe-stacks --stack-name  --query "Stacks[].Outputs[?OutputKey=='DNSName'].OutputValue" --output text

3. 更新DNS TTL:

aws route53 change-resource-record-sets --hosted-zone-id  --change-batch file://t2.json

t2.json:

{
    "Comment": "Update record TTL",
    "Changes": [
        {
            "Action": "UPSERT",
            "ResourceRecordSet": {
                "Name": "",
                "Type": "A",
                "TTL": 300,
                "ResourceRecords": [
                    {
                        "Value": ""
                    }