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Building Scalable Web Applications Using AWS CLI & WordPress

Setting up Health Checks

Explore how AWS load balancers perform health checks to ensure your WordPress instances are healthy and ready to serve traffic. Understand the parameters that control health check frequency, thresholds, and response times, and how they impact application availability in a scalable environment.

We'll cover the following...

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:

Shell
{
    "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. ...