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1. The most likely reason your team member is unable to attach the EBS volume to an EC2 instance `in us-east-1b` is that EBS volumes are tied to a specific Availability Zone (AZ) upon creation. Since the volume was originally attached to an EC2 instance in us-east-1a, it is restricted to that AZ and cannot be directly attached to an instance `in us-east-1b`. us-east-1a์—์„œ์˜ EC2 ์ธ์Šคํ„ด์Šค๋ฅผ ์ข…๋ฃŒํ•˜์—ฌ, ์ด ์ธ์Šคํ„ด์Šค์—..
1. EBS Volume Types1-1. What is EBS Volume Typesโ–ถ EBS Volumes come in 6 typesgp2 / gp3 (SSD): General purpose SSD volume  that balances price and performance for a wide variety of workloads.io 1 / io 2 Block Express (SSD): Highest-performance SSD volume for mission-critical low-latency or high-throughput workloadsst 1 (HDD): Low cost HDD volume designed for frequently accessed, throughput-intens..
1. Amazon EBS ๋ธ”๋Ÿญ ์Šคํ† ๋ฆฌ์ง€ Ephemeral → EC2 Instance Store (์ธ์Šคํ„ด์Šค ์ข…๋ฃŒ ์‹œ ๋ฐ์ดํ„ฐ ์‚ฌ๋ผ์ง)Persistent → Amazon EBS (๋ธ”๋ก ์ €์žฅ), Amazon S3 (๊ฐ์ฒด ์ €์žฅ) ์•„๋งˆ์กด ์ €์žฅ์†Œ ์ค‘์— ๋ธ”๋Ÿญ ์ €์žฅ์†Œ(Amazon Block Storage)๋ผ๊ณ  ํ•˜๋ฉด ๋ณดํ†ต Amazon Elastic Block Store (EBS)๋ฅผ ์˜๋ฏธํ•œ๋‹ค. ๋ธ”๋ก ์Šคํ† ๋ฆฌ์ง€ ์„œ๋น„์Šค๋ผ๊ณ  ๋ถ€๋ฅด๊ธฐ๋„ ํ•œ๋‹ค. ๋ธ”๋ก ์Šคํ† ๋ฆฌ์ง€๋Š” ๋‹ค์‹œ ephemeral(ํœ˜๋ฐœ์„ฑ) ๊ณผ persistent(๋น„ํœ˜๋ฐœ์„ฑ) ์ €์žฅ์†Œ๋กœ ๋‚˜๋ˆŒ ์ˆ˜ ์žˆ๋‹ค. Ephemeral Storage (ํœ˜๋ฐœ์„ฑ ์ €์žฅ์†Œ)๋Š” EC2 ์ธ์Šคํ„ด์Šค๊ฐ€ ์ข…๋ฃŒ๋˜๋ฉด ๋ฐ์ดํ„ฐ๊ฐ€ ์‚ฌ๋ผ์ง€๋Š” ์ž„์‹œ ์ €์žฅ์†Œ์ด๋‹ค. AWS์—์„œ ๋Œ€ํ‘œ์ ์œผ๋กœ Instance Store๊ฐ€ ํœ˜๋ฐœ์„ฑ ์ €์žฅ์†Œ์ด๋‹ค..
1.  What's AMI ?AMI = Amazon Machine Imageโ–ถ AMI are a customization of an EC2 instanceโ–ถ AMI(Amazon Machine Image)๋Š” AWS์—์„œ EC2 ์ธ์Šคํ„ด์Šค๋ฅผ ์ƒ์„ฑํ•  ๋•Œ ์‚ฌ์šฉํ•˜๋Š” ํ…œํ”Œ๋ฆฟ์ด๋‹ค.โ–ถ AMI๋Š” EC2 ์ธ์Šคํ„ด์Šค๋ฅผ ์‰ฝ๊ฒŒ ์ƒ์„ฑํ•˜๊ณ  ๊ด€๋ฆฌํ•  ์ˆ˜ ์žˆ๋„๋ก ๋„์™€์ฃผ๋Š” OS + ์„ค์ • ํŒจํ‚ค์ง€๋กœ ์šด์˜ ์ฒด์ œ(OS), ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜, ์‹คํ–‰ ํ™˜๊ฒฝ ์„ค์ • ๋“ฑ์„ ํฌํ•จํ•œ EC2 ์ธ์Šคํ„ด์Šค์˜ ์‚ฌ๋ณธ(์ด๋ฏธ์ง€)์ด๋‹ค.You have your own software, configuration, operating system, monitoring...Faster boot  / configuration time because all your software is pre-p..
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