Sono disponibili altri esempi AWS SDK nel repository [AWS Doc SDK](https://github.com/awsdocs/aws-doc-sdk-examples) Examples. GitHub 

Le traduzioni sono generate tramite traduzione automatica. In caso di conflitto tra il contenuto di una traduzione e la versione originale in Inglese, quest'ultima prevarrà.

# Nozioni di base sul rilevamento servizi Cloud Map
<a name="servicediscovery_example_cloudmap_ServiceDiscovery_section"></a>

L’esempio di codice seguente mostra come:
+ Creare un namespace DNS pubblico con l’integrazione delle zone ospitate da Route 53
+ Creare servizi rilevabili tramite query DNS e chiamate API
+ Registrare le istanze del servizio con diverse configurazioni di rilevamento
+ Rilevare i servizi utilizzando sia le query DNS che l’API Cloud Map
+ Verificare il rilevamento servizi utilizzando il comando dig e le chiamate API
+ Eseguire la pulizia delle risorse nell’ordine corretto (istanze, servizi, namespace)

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#### [ Bash ]

**AWS CLI con script Bash**  
 C'è altro da fare. GitHub Trova l’esempio completo e scopri come eseguire la configurazione e l’esecuzione nel [repository dei tutorial sugli esempi di codice per gli sviluppatori](https://github.com/aws-samples/sample-developer-tutorials/tree/main/tuts/010-cloudmap-service-discovery). 

```
#!/bin/bash

# AWS Cloud Map Private Namespace Tutorial Script
# This script demonstrates how to use AWS Cloud Map for service discovery
# with DNS queries and API calls

# Exit on error
set -e

# Configuration
REGION="us-east-2"
NAMESPACE_NAME="cloudmap-tutorial.com"
LOG_FILE="cloudmap-tutorial.log"
CREATOR_REQUEST_ID=$(date +%s)

# Function to log messages
log() {
    local message="$1"
    echo "$(date '+%Y-%m-%d %H:%M:%S') - $message" | tee -a "$LOG_FILE"
}

# Function to check operation status
check_operation() {
    local operation_id="$1"
    local status=""
    
    log "Checking operation status for $operation_id..."
    
    while [[ "$status" != "SUCCESS" ]]; do
        sleep 5
        status=$(aws servicediscovery get-operation \
            --operation-id "$operation_id" \
            --region "$REGION" \
            --query "Operation.Status" \
            --output text)
        
        log "Operation status: $status"
        
        if [[ "$status" == "FAIL" ]]; then
            log "Operation failed. Exiting."
            exit 1
        fi
    done
    
    log "Operation completed successfully."
}

# Function to clean up resources
cleanup() {
    log "Starting cleanup process..."
    
    if [[ -n "$FIRST_INSTANCE_ID" ]]; then
        log "Deregistering first service instance..."
        aws servicediscovery deregister-instance \
            --service-id "$PUBLIC_SERVICE_ID" \
            --instance-id "$FIRST_INSTANCE_ID" \
            --region "$REGION" || log "Failed to deregister first instance"
    fi
    
    if [[ -n "$SECOND_INSTANCE_ID" ]]; then
        log "Deregistering second service instance..."
        aws servicediscovery deregister-instance \
            --service-id "$BACKEND_SERVICE_ID" \
            --instance-id "$SECOND_INSTANCE_ID" \
            --region "$REGION" || log "Failed to deregister second instance"
    fi
    
    if [[ -n "$PUBLIC_SERVICE_ID" ]]; then
        log "Deleting public service..."
        aws servicediscovery delete-service \
            --id "$PUBLIC_SERVICE_ID" \
            --region "$REGION" || log "Failed to delete public service"
    fi
    
    if [[ -n "$BACKEND_SERVICE_ID" ]]; then
        log "Deleting backend service..."
        aws servicediscovery delete-service \
            --id "$BACKEND_SERVICE_ID" \
            --region "$REGION" || log "Failed to delete backend service"
    fi
    
    if [[ -n "$NAMESPACE_ID" ]]; then
        log "Deleting namespace..."
        aws servicediscovery delete-namespace \
            --id "$NAMESPACE_ID" \
            --region "$REGION" || log "Failed to delete namespace"
    fi
    
    log "Cleanup completed."
}

# Set up trap for cleanup on script exit
trap cleanup EXIT INT TERM

# Initialize log file
> "$LOG_FILE"
log "Starting AWS Cloud Map tutorial script"

# Step 1: Create an AWS Cloud Map namespace
log "Creating AWS Cloud Map namespace: $NAMESPACE_NAME"
OPERATION_RESULT=$(aws servicediscovery create-public-dns-namespace \
    --name "$NAMESPACE_NAME" \
    --creator-request-id "cloudmap-tutorial-$CREATOR_REQUEST_ID" \
    --region "$REGION")

OPERATION_ID=$(echo "$OPERATION_RESULT" | jq -r '.OperationId')
log "Namespace creation initiated. Operation ID: $OPERATION_ID"

# Check operation status
check_operation "$OPERATION_ID"

# Get the namespace ID
log "Getting namespace ID..."
NAMESPACE_ID=$(aws servicediscovery list-namespaces \
    --region "$REGION" \
    --query "Namespaces[?Name=='$NAMESPACE_NAME'].Id" \
    --output text)

log "Namespace ID: $NAMESPACE_ID"

# Get the hosted zone ID
log "Getting Route 53 hosted zone ID..."
HOSTED_ZONE_ID=$(aws route53 list-hosted-zones-by-name \
    --dns-name "$NAMESPACE_NAME" \
    --query "HostedZones[0].Id" \
    --output text | sed 's|/hostedzone/||')

log "Hosted Zone ID: $HOSTED_ZONE_ID"

# Step 2: Create the AWS Cloud Map services
log "Creating public service..."
PUBLIC_SERVICE_RESULT=$(aws servicediscovery create-service \
    --name "public-service" \
    --namespace-id "$NAMESPACE_ID" \
    --dns-config "RoutingPolicy=MULTIVALUE,DnsRecords=[{Type=A,TTL=300}]" \
    --region "$REGION")

PUBLIC_SERVICE_ID=$(echo "$PUBLIC_SERVICE_RESULT" | jq -r '.Service.Id')
log "Public service created. Service ID: $PUBLIC_SERVICE_ID"

log "Creating backend service..."
BACKEND_SERVICE_RESULT=$(aws servicediscovery create-service \
    --name "backend-service" \
    --namespace-id "$NAMESPACE_ID" \
    --type "HTTP" \
    --region "$REGION")

BACKEND_SERVICE_ID=$(echo "$BACKEND_SERVICE_RESULT" | jq -r '.Service.Id')
log "Backend service created. Service ID: $BACKEND_SERVICE_ID"

# Step 3: Register the AWS Cloud Map service instances
log "Registering first service instance..."
FIRST_INSTANCE_RESULT=$(aws servicediscovery register-instance \
    --service-id "$PUBLIC_SERVICE_ID" \
    --instance-id "first" \
    --attributes "AWS_INSTANCE_IPV4=192.168.2.1" \
    --region "$REGION")

FIRST_INSTANCE_ID="first"
FIRST_OPERATION_ID=$(echo "$FIRST_INSTANCE_RESULT" | jq -r '.OperationId')
log "First instance registration initiated. Operation ID: $FIRST_OPERATION_ID"

# Check operation status
check_operation "$FIRST_OPERATION_ID"

log "Registering second service instance..."
SECOND_INSTANCE_RESULT=$(aws servicediscovery register-instance \
    --service-id "$BACKEND_SERVICE_ID" \
    --instance-id "second" \
    --attributes "service-name=backend" \
    --region "$REGION")

SECOND_INSTANCE_ID="second"
SECOND_OPERATION_ID=$(echo "$SECOND_INSTANCE_RESULT" | jq -r '.OperationId')
log "Second instance registration initiated. Operation ID: $SECOND_OPERATION_ID"

# Check operation status
check_operation "$SECOND_OPERATION_ID"

# Step 4: Discover the AWS Cloud Map service instances
log "Getting Route 53 name servers..."
NAME_SERVERS=$(aws route53 get-hosted-zone \
    --id "$HOSTED_ZONE_ID" \
    --query "DelegationSet.NameServers[0]" \
    --output text)

log "Name server: $NAME_SERVERS"

log "Using dig to query DNS records (this will be simulated)..."
log "Command: dig @$NAME_SERVERS public-service.$NAMESPACE_NAME"
log "Expected output would show: public-service.$NAMESPACE_NAME. 300 IN A 192.168.2.1"

log "Using AWS CLI to discover backend service instances..."
DISCOVER_RESULT=$(aws servicediscovery discover-instances \
    --namespace-name "$NAMESPACE_NAME" \
    --service-name "backend-service" \
    --region "$REGION")

log "Discovery result: $(echo "$DISCOVER_RESULT" | jq -c '.')"

# Display created resources
log "Resources created:"
log "- Namespace: $NAMESPACE_NAME (ID: $NAMESPACE_ID)"
log "- Public Service: public-service (ID: $PUBLIC_SERVICE_ID)"
log "- Backend Service: backend-service (ID: $BACKEND_SERVICE_ID)"
log "- Service Instance: first (Service: public-service)"
log "- Service Instance: second (Service: backend-service)"

# Ask user if they want to clean up resources
read -p "Do you want to clean up all created resources? (y/n): " CLEANUP_RESPONSE

if [[ "$CLEANUP_RESPONSE" == "y" || "$CLEANUP_RESPONSE" == "Y" ]]; then
    log "User confirmed cleanup. Proceeding with resource deletion."
    # Cleanup function will be called automatically on exit
else
    log "User chose not to clean up resources. Exiting without cleanup."
    trap - EXIT
    exit 0
fi
```
+ Per informazioni dettagliate sull’API, consulta i seguenti argomenti nella *documentazione di riferimento dei comandi della AWS CLI *.
  + [CreatePublicDnsNamespace](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/CreatePublicDnsNamespace)
  + [CreateService](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/CreateService)
  + [DeleteNamespace](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/DeleteNamespace)
  + [DeleteService](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/DeleteService)
  + [DeregisterInstance](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/DeregisterInstance)
  + [DiscoverInstances](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/DiscoverInstances)
  + [GetOperation](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/GetOperation)
  + [ListNamespaces](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/ListNamespaces)
  + [RegisterInstance](https://docs.aws.amazon.com/goto/aws-cli/servicediscovery-2017-03-14/RegisterInstance)

------