Overview
- Automatically add/remove EC2 instances based on certain conditions you set
- Ensures sufficient capacity at all times, without over-provisioning
- Scaling - “adding more instances”
Creating an Auto Scaling Group
EC2 console > Auto Scaling Groups- You create a group of rules that will ensure that a certain amount of EC2 instances are running based on certain conditions
- Choose a launch template
- a feature that tells AWS how your EC2 instances should be configured
- since we won’t be creating them manually
- Creating a launch template → same with EC2 launch wizard
- You need to choose VPCs and subnets that can be used for launching
- Choose a load balancer (Elastic Load Balancer (ELB)) + target group
- make sure u choose the same VPCs and subnets that you chose in the previous step
- Set up the rule for which kind of requests you want to listen
- ex. HTTPs requests
- Create a new target group - a collection of instances (EC2, containers, IP addresses, etc.) that receive traffic from a load balancer
- group of instances that will be used for forwarding requests to
- If a load balancer is connected to an auto scaling group, then it will automatically add all instances that are created by that auto scaling group to this target group
- Health check
- is an instance healthy - capable of receiving requests
- Choose Auto scaling conditions
- set the capacities you want to have for your instances
- desired capacity - the default capacity you want to have
- minimum/maximum capacity
- scaling policy
- define the metric where you want to scale up
- CPU utilization, network, etc
- set the capacities you want to have for your instances
- Choose notifs
- maybe an email so you know when an instance is added
- Tags
- identify resources
- Choose a launch template