今天在嘗試啟動 EC2 instance 時，突然出現了個選項 Capacity Reservation
預設是 OPEN 著實讓我嚇了一跳。詢問了大神們也不知道
於是只好發了封 support 出去
I noticed an option name Capacity Reservation when I wanna to launch a new ec2 instance. The default value is OPEN, what is this option mean?接著收到了回復，全文在最下面
由於AZ的運算資源有限，所以有時候在啟動ec2的時候會出現 Insufficient Instance Capacity 的錯誤訊息
官方文件也有關於如何解決這個問題的方法
就是等別人釋放資源
https://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/troubleshooting-launch.html
於是AWS推出這個新功能 Capacity Reservation 作為解決的方法。
總之....掏錢先把位子預留下來如何？
如果看到這篇的大爺您真的有興趣先把位子預留下來，可以直接到櫃台 https://console.aws.amazon.com/ec2sp/v1/lr/home 購買
當然啦，大爺您有錢先把場子給包了
AWS就敢數錢囉~這兒講得很明白
Capacity Reservation requests are granted or denied based on your EC2 instance limits and our available capacity. When you create a Capacity Reservation, we reserve the specified capacity for your use. The reserved capacity is charged at the selected instance type’s On-Demand rate whether an instance is running in it or not. You can also use your regional reserved instances with your Capacity Reservations to benefit from billing discounts.
不管你有沒有在用，我就是跟你算錢。當然也可以跟AWS簽RI賣身契。
有意思的是回信中有說明各種選項
Open -> the default, the instance will be automatically matched with a capacity reservation of the same type, if you have no capacity reservations at all then this option will be same as none and you can ignore it. None -> the instance will not be counted against a capacity reservation even if you have a matching one. Eligible capacity reservation id(s) -> You will see one or more capacity reservations if you have already created matching ones選 OPEN 他會優先使用你包場的部分，不足的部分就變成 None
所以開機器不用擔心會跟你多收費，因為我們本來就沒錢包場。安心Launch下去吧
至於 None 就是本來的樣子，也不用刻意去選擇他。
Eligible capacity reservation id(s) 看樣子是包場以後才會出現
看完回信以後，我還是乖乖等幾分鐘好了...(轉頭看帳戶餘額)
信件全文
Amazon Web Services Oct 26, 2018 07:03 PM +0800 Hello Thanks for contacting AWS support, my name is Asem and I will be assisting you today. You seem to have stumbled upon a newly added feature that was just released :) As you may have already known by now, the capacity of an instance type in an availability zone is finite, and if you request an instance type that we have no capacity for you will get "Insufficient Capacity Error" https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshooting-launch.html#troubleshooting-launch-capacity The new Capacity reservation feature is our attempt to remedy this problem by allowing customers to receive a number of instances of certain type and platform in a specific availability zone. You can read more about this feature here. https://aws.amazon.com/ec2/faqs/#capacityreservations Using this link https://console.aws.amazon.com/ec2sp/v1/lr/home, you can create multiple capacity reservations and when you launch an instance you can select which capacity reservation will the instance belong to. The possible options are Open -> the default, the instance will be automatically matched with a capacity reservation of the same type, if you have no capacity reservations at all then this option will be same as none and you can ignore it. None -> the instance will not be counted against a capacity reservation even if you have a matching one. Eligible capacity reservation id(s) -> You will see one or more capacity reservations if you have already created matching ones Hopefully, I have provided you with useful information, if you feel the need to follow up with any additional questions or concerns please let me know. Best regards, Asem M. Amazon Web Services Check out the AWS Support Knowledge Center, a knowledge base of articles and videos that answer customer questions about AWS services: https://aws.amazon.com/premiumsupport/knowledge-center/?icmpid=support_email_category We value your feedback. Please rate my response using the link below. =================================================== To contact us again about this case, please return to the AWS Support Center using the following URL: https://console.aws.amazon.com/support/home#/case/?displayId=5472600191&language=en (If you are connecting by federation, log in before following the link.) *Please note: this e-mail was sent from an address that cannot accept incoming e-mail. Please use the link above if you need to contact us again about this same issue. ==================================================================== Learn to work with the AWS Cloud. Get started with free online videos and self-paced labs at http://aws.amazon.com/training/ ==================================================================== Amazon Web Services, Inc. is an affiliate of Amazon.com, Inc. Amazon.com is a registered trademark of Amazon.com, Inc. or its affiliates.
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