CloudWatch

Create a Dashboard from the AWS Console

1. From the AWS console, select CloudWatch.
2. From the left menu, select Dashboards , and then select the Create dashboard button.
3. Enter a Dashboard name in the field, and then select the Create dashboard button.
4. From the Add widget page, choose your Widget type.
   1. Graph (Line/Stacked area): Select Configure and then select one or more metrics in the Add metric graph dialog. Select the Create widget.
      1. If a metric isn’t listed (for example, if there is no data from the last 14 days), you can manually add it. For more information, see Graph metrics manually on a CloudWatch dashboard.
5. Choose Add widget, and repeat the step 4 to add more widgets. You can add as many as metrics you want.
6. For any graph, click the info icon to see metric descriptions.
7. Click on the Save dashboard button to save your changes.

For example, a custom dashboard is created using the metrics of two virtual machines in an Exadata VM Cluster. This dashboard displays a comparative analysis of metrics such as CPU Utilization, SWAP Utilization, Memory Utilization, and Load Average for the two VMs in the cluster.

A metric alarm monitors a single CloudWatch metric or the result of a mathematical expression based on CloudWatch metrics. It triggers one or more actions when the monitored metric or expression breaches a specified threshold over a set number of evaluation periods. These actions include sending notifications through Amazon Simple Notification Service (SNS) , executing Amazon EC2 or Auto Scaling actions, or creating OpsItems or incidents in AWS Systems Manager.

In this following example, you will create an Amazon SNS topic to enable notifications by email and text message. Create a topic named AutonomousMonitor and subscribe your work email address to receive notifications. This SNS topic will also be used later when configuring CloudWatch alarms.

1. Create an Amazon SNS topic by running the following command:

   aws sns create-topic --name <Name of the SNS topic>

2. Subscribe to the topic, then specify the email protocol and the email address for the notification endpoint by running the following command:

   aws sns subscribe --topic-arn <ARN of the SNS topic created> --protocol email --notification-endpoint <Email ID>

3. Confirm the subscription before the email address can start receiving messages.
   1. Check your email and choose Confirm subscription in the email you receive from Amazon SNS.
   2. Amazon SNS automatically opens your web browser and displays a subscription confirmation with your subscription ID.
   
4. Check the status of the subscription. It will return 1 if the status is Confirmed.

   aws sns get-topic-attributes \
   
     --topic-arn < ARN of the topic > \
   
     --query 'Attributes.SubscriptionsConfirmed' \
   
     --output text

5. Now, you can create a CloudWatch alarm on any of the dashboard widgets. Collect the metrics from the three namespaces—AWS/ODB. You can use the following query to identify the available metrics in each namespaces:

   aws cloudwatch list-metrics --namespace "AWS/ODB"

6. Choose any metric and use the following code to create a CloudWatch alarm. Be sure to specify the correct namespace, dimensions, and metric name. The example below demonstrates how to creatw an alarm for high CPU utilization when a database exceeds 60 percent.

   aws cloudwatch put-metric-alarm \
   
     --alarm-name cpu_monitor_ATP \
   
     --alarm-description "Alarm when CPU exceeds 60% for ATP PDBTESTARNAB" \
   
     --metric-name CpuUtilization \
   
     --namespace AWS/ODB \
   
     --statistic Average \
   
     --period 60 \
   
     --threshold 60 \
   
     --comparison-operator GreaterThanThreshold \
   
     --dimensions Name=ociCloudAutonomousVmClusterId,Value=ocid1.cloudautonomousvmcluster.oc1.iad.anuwcljtbpyurlyac4bbp52ehggvqadbtsjeqwuiqcgah4i6mndr6swd6u2a \
   
                  Name=deploymentType,Value=Dedicated \
   
                  Name=resourceId,Value=ocid1.autonomousdatabase.oc1.iad.anuwcljtbpyurlyai6xy7kik3wdj4sz273wjg2kolfbkse6ons7v2dcte76q \
   
                  Name=cloudExadataInfrastructureId,Value=exa_e913o1khws \
   
                  Name=cloudAutonomousVmClusterId,Value=avmc_xgzshl9ela \
   
                  Name=displayName,Value="CPU Utilization" \
   
                  Name=resourceName,Value=PDBTESTARNAB \
   
                  Name=region,Value=iad \
   
                  Name=autonomousDBType,Value=ATP \
   
                  Name=ociCloudExadataInfrastructureId,Value=ocid1.cloudexadatainfrastructure.oc1.iad.anuwcljtbpyurlyazqzf3ggqwaydvu32l34izfzm4a4vnsay7b67iaedza6a \
   
     --evaluation-periods 2 \
   
     --alarm-actions arn:aws:sns:us-east-1:182399700237:AutonomousMonitor

   
7. The following screenshot shows the email that you will receive.