Status Checks are the automatic health checks that EC2 performs on your instances every minute. They detect both instance settings and underlying hardware problems.
Types of Status check
There are basically 2 types of Status checks –
1 – System status check
System status checks to keep an eye on the AWS services where your instance is running. These checks identify underlying issues with your instance that require AWS intervention to resolve.
When a system status check fails, you have the option of waiting for AWS to resolve the problem or resolving it yourself.
For Amazon EBS-backed instances, you can manually stop and restart the instance, which in most cases migrates it to a new host computer.
You can terminate and replace instances supported by an instance store.
2 – Instance Status Check
Check the software and network settings for your specific instance. These tests identify issues that need your assistance to fix.
Usually, if an instance status check fails, you will have to fix the issue on your own (for example, by rebooting the instance or by making instance configuration changes).
Step 1- Create an Alarm
First, select an EC2 instance on which you have to configure an alarm for status check failure then click on the option – ‘status checks’ as shown in the below picture.
Then, go to the “Actions” –> click on “Create status check alarm”
Now, click on “Create an alarm” and enter the name of the SNS topic(For ex – status_alarm) to receive an email whenever any of the status checks got failed.
Do the below configurations as shown in the below image.
Click on “Create”
Amazon SNS (Amazon Simple Notification Service) is a managed service that delivers messages from publishers to subscribers. It is a web service that makes it simple to set up, run, and send cloud notifications.
Step 2- Create an SNS subscription
Search for SNS service from the search bar
You will see one SNS topic is already created with the same name – status_alarm that you mentioned while creating the alarm.
Go to this SNS topic and then click on the option – “subscription” and click on the ‘Create subscription’ button.
Enter all the required details below
Then, click on Create
After Creating the subscription you will receive an email from AWS to confirm the subscription.
Once the subscription has been confirmed by you then you check the status of the subscription and whether it has been confirmed or not.
Now, whenever either of the status checks gets failed you will be notified on the registered email address and you can check the root cause of that failure.
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