Day #4 : AWS Alarm
Just after setting up the account and started learning this things need to be cover first so as not have a Big amount of Bill for the AWS resources that you just coonsumed …..
AWS sent notification if things doesnt go upto your expectation in forms of Alarms. Alarms section comes under AWS Cloudwatch which we will learn more about upcoming days.
The most important tip of this article is that CloudWatch can alert you when your bill is likely to become too high. You should never run any workload on AWS without this alarm, as it is quite easy to forget resources spun up for testing purposes. To create such a billing alarm, you need to log in to the AWS console using either the root user or an IAM user who has permission to access the billing section of the console.
The first step is to enable billing alerts. Click on your user name in the top-right corner of the screen, then click on “My Billing Dashboard.” In the left pane, select “Billing preferences,” then enable “Receive Billing Alerts,” and finally click on “Save preferences.”
Enabling Billing Alerts on AWS
The second step is to actually create a billing alarm. Head over to the CloudWatch service. In the left pane, click on “Alarms,” and then click on the “Create Alarm” button. Choose the “Billing, Total Estimated Charge” metric, and configure the alarm to go off when this metric is greater than a monthly amount you would like to be alerted; click “Next.” Then select “Create a New SNS Topic,” and enter a name for the SNS topic and your email address; click “Create topic.” Click “Next,” enter a name for the alarm, click “Next” again, and, finally, “Create Alarm.” That’s it!
Talking about more advance use case of Alarms there are 2 type of alarms metric alarms and composite alarms in CloudWatch.
- A metric alarm watches a single CloudWatch metric or the result of a math expression based on CloudWatch metrics. The alarm performs one or more actions based on the value of the metric or expression relative to a threshold over a number of time periods. The action can be an Amazon EC2 action, an Auto Scaling action, or a notification sent to an Amazon SNS topic.
- A composite alarm includes a rule expression that takes into account the alarm states of other alarms that you have created. The composite alarm goes into ALARM state only if all conditions of the rule are met. The alarms specified in a composite alarm’s rule expression can include metric alarms and other composite alarms.Using composite alarms can reduce alarm noise. You can create multiple metric alarms, and also create a composite alarm and set up alerts only for the composite alarm. For example, a composite might go into ALARM state only when all of the underlying metric alarms are in ALARM state.Composite alarms can send Amazon SNS notifications when they change state, but can’t perform EC2 actions or Auto Scaling actions.
You can add alarms to CloudWatch dashboards and monitor them visually. When an alarm is on a dashboard, it turns red when it is in the ALARM state, making it easier for you to monitor its status proactively.
An alarm invokes actions only when the alarm changes state. The exception is for alarms with Auto Scaling actions. For Auto Scaling actions, the alarm continues to invoke the action once per minute that the alarm remains in the new state.
Please leave a comment if you want to know more about it or about your likes dislikes about it. Thanks for reading.