<#import "/templates/guide.adoc" as tmpl>
<#import "/templates/links.adoc" as links>

<@tmpl.guide
title="Take site offline"
summary="This describes how to take a site offline so that it no longer processes client requests" >

== When to use this procedure

During the deployment lifecycle it might be required that one of the sites is temporarily taken offline
for maintenance or to allow for software upgrades. To ensure that no user requests are routed to the site requiring
maintenance, it is necessary for the site to be removed from your loadbalancer configuration.

== Procedure

Follow these steps to remove a site from the loadbalancer so that no traffic can be routed to it.

=== Global Accelerator

. Determine the ARN of the Network Load Balancer (NLB) associated with the site to be kept online
+
<#include "partials/accelerator/nlb-arn.adoc" />
+
. Update the Accelerator EndpointGroup to only include a single site
+
<#include "partials/accelerator/endpoint-group.adoc" />
+
.Output:
[source,bash]
----
{
    "EndpointGroups": [
        {
            "EndpointGroupArn": "arn:aws:globalaccelerator::606671647913:accelerator/d280fc09-3057-4ab6-9330-6cbf1f450748/listener/8769072f/endpoint-group/a30b64ec1700",
            "EndpointGroupRegion": "eu-west-1",
            "EndpointDescriptions": [
                {
                    "EndpointId": "arn:aws:elasticloadbalancing:eu-west-1:606671647913:loadbalancer/net/a49e56e51e16843b9a3bc686327c907b/9b786f80ed4eba3d",
                    "Weight": 128,
                    "HealthState": "HEALTHY",
                    "ClientIPPreservationEnabled": false
                },
                {
                    "EndpointId": "arn:aws:elasticloadbalancing:eu-west-1:606671647913:loadbalancer/net/a3c75f239541c4a6e9c48cf8d48d602f/5ba333e87019ccf0",
                    "Weight": 128,
                    "HealthState": "HEALTHY",
                    "ClientIPPreservationEnabled": false
                }
            ],
            "TrafficDialPercentage": 100.0,
            "HealthCheckPort": 443,
            "HealthCheckProtocol": "TCP",
            "HealthCheckIntervalSeconds": 30,
            "ThresholdCount": 3
        }
    ]
}
----
+
.. Update the EndpointGroup to only include the NLB retrieved in step 1.
+
.Command:
[source,bash]
----
aws globalaccelerator update-endpoint-group \
  --endpoint-group-arn arn:aws:globalaccelerator::606671647913:accelerator/d280fc09-3057-4ab6-9330-6cbf1f450748/listener/8769072f/endpoint-group/a30b64ec1700 \
  --region us-west-2 \
  --endpoint-configurations '
  [
    {
        "EndpointId": "arn:aws:elasticloadbalancing:eu-west-1:606671647913:loadbalancer/net/a49e56e51e16843b9a3bc686327c907b/9b786f80ed4eba3d",
        "Weight": 128,
        "ClientIPPreservationEnabled": false
    }
  ]
'
----

</@tmpl.guide>