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Scalability, Auto Scaling
Group, High Availability - Coggle Diagram
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Auto Scaling
Group
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Auto Scaling Alarms
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Rules
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Custom
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- Send custom metric from
application on EC2 to CloudWatch (PutMetric API)
- Create CloudWatch alarm to react to low.high values
- Use CloudWatch alarm as the scaling policy for ASG
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GtK
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If an EC2 under an ASG
gets terminated, it automatically
replaces it
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Scaling Policies
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Simple/Step Scaling
If CPU > 70%, add 2
If CPU < 30%, remove 1
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Scaling Cooldowns
helps ensure that
your ASG doesn't launch/terminate
instances before previous scaling
activity takes effect
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