AWS - EC2 Fundamentals
You want to launch 3 EC2 instances with the same settings but different subnet IDs for high availability. Which approach is best?
You want to launch 3 EC2 instances with the same settings but different subnet IDs for high availability. Which approach is best?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand subnet and instance launch
Each EC2 instance can be launched in only one subnet at a time.Step 2: Plan for multiple subnets
To launch instances in different subnets, run separate commands specifying each subnet ID.Step 3: Evaluate options
Run three separateaws ec2 run-instancescommands, each with a different--subnet-id. This runs three commands with different subnet IDs, ensuring instances spread across subnets.Final Answer:
Run three separate aws ec2 run-instances commands, each with a different --subnet-id -> Option DQuick Check:
One subnet per instance, multiple commands for multiple subnets [OK]
Quick Trick: One subnet per instance, use multiple commands for multiple subnets [OK]
Common Mistakes:
MISTAKES- Trying to launch multiple subnets in one command
- Assuming cloning instances copies subnet settings
- Confusing subnet creation with instance launch
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