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[ AWS Monitoring : CloudWatch Alarms ]

Alarm은 metric 값에 대한 알림을 주기위해 사용

- Alarms are used to trigger notifications for any metric

- Various options (sampling, %, max, min, etc..)

- Alarms States :

  1) OK

  2) INSUFFICIENT_DATA

  3) ALARM

- Period :

  -- Length of time in seconds to evaludate the metric

  -- High resolution custom metrics : 10 sec, 30 sec, or multiples of 60 sec

[ CloudWatch Alarm Targets ]

CloudWatch 가 Alarm 이 울리면(metric 값에 의해) EC2 를 Stop, Terminate, Reboot, or Recover 할 수 있음

Auto Scaling 실행

SNS 로 알림

- Stop, Terminate, Reboot, or Recover an EC2 Instance 

- Trigger Auto Scaling Action

- Send notification to SNS (from which you can do pretty much anything)

[ EC2 Instance Recovery ]

- Status Check :

  Instance status = check the EC2 VM

  System status = check the underlying hardware

Recovery : Same Private, Public, Elastic IP, metadata, placement group

[ CloudWatch Alarm : good to know ]

CloudWatch Logs Metrics Filter 에 의해 알람이 생성되며 알람은 SNS 를 통해 adm에게 알림

- Alarms can be created based on CloudWatch Logs Metrics Filters

- To test alarms and notifications, set the alarm state to Alarm using CLI

aws cloudwatch set-alarm-state --alarm-name "myalarm" --state-value ALARM --state-reason "testing purposes"

[ CloudWatch Events ]

AWS 서비스 관제기능

EC2 인스턴스 기동 등의 AWS 서비스로부터 이벤트 인터셉트. 스케쥴링이나 크론으로 설정 가능

* EC2 인스턴스 실행시 관제 메시지 발생시키거나 하는 등의 기능

Event Pattern : Intercept events from AWS services (Sources)

- Example sources: EC2 Instance Start, CodeBuild Failure, S3, Trusted Advisor

- Can intercept any API call with CloudTrail integration

Schedule or Cron

A JSON payload is created from the event and passed to a target

- Compute : Lambda, Batch, ECS task

- Integration : SQS, SNS, Kinesis Data Streams, Kinesis Data Firehose

- Orchestration : Step Functions, CodePipeline, CloudBuild

- Maintenance : SSM, EC2 Actions