Building Scalable Web Applications Using AWS CLI & WordPress/

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Setting up Health Checks

Setting up Health Checks

Learn what health checks are and how they help with scalability and high availability.

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We briefly talked about the output of the create-load-balancer command and that it contained some information regarding health checks. Let’s take a look at it again. This was the output from the create-load-balancer command:

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{
    "TargetGroups": [
        {
            "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-2:970721244190:targetgroup/wordpress-instances/f90da387759cfd22",
            "TargetGroupName": "wordpress-instances",
            "Protocol": "HTTP",
            "Port": 80,
            "VpcId": "vpc-0b9d694685a2ca2ee",
            "HealthCheckProtocol": "HTTP",
            "HealthCheckPort": "traffic-port",
            "HealthCheckEnabled": true,
            "HealthCheckIntervalSeconds": 30,
            "HealthCheckTimeoutSeconds": 5,
            "HealthyThresholdCount": 5,
            "UnhealthyThresholdCount": 2,
            "HealthCheckPath": "/",
            "Matcher": {
                "HttpCode": "200"
            },
            "TargetType": "instance",
            "ProtocolVersion": "HTTP1",
            "IpAddressType": "ipv4"
        }
    ]
}

As we can see, there is a whole section related to health checks, even though we didn’t configure them. ...