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CloudFront 在東京開到第八個點了...

看到 Amazon CloudFront 宣佈在東京開到第八個點了:「Amazon CloudFront launches eighth Edge location in Tokyo, Japan」。

Amazon CloudFront announces the addition of an eighth Edge location in Tokyo, Japan. The addition of another Edge location continues to expand CloudFront's capacity in the region, allowing us to serve increased volumes of web traffic.

這個成長速度有點驚人,一月才加了兩個,現在又要再加一個... 不過大阪還是維持一個。

Amazon EFS 在首爾先開了...

Amazon EFS 其實就是 AWS 提供的雲端版 NFS 或是 CIFS,這對於某些應用來說很好用,尤其效能不是主要考量時,像是從外面買來的商用軟體需要找個空間放資料...

不過沒想到在亞洲第一個開的點居然是首爾 (i.e. ap-northeast-2):「Amazon Elastic File System (Amazon EFS) Available in Asia Pacific (Seoul) Region」。

提到 AWS 的首爾區,台北過去的直線距離雖然比大阪與東京都近,但各家的路由都是從日本繞過去,不然其實首爾的點應該會是台灣的首選... 不曉得北京與上海到首爾的連線情況又是如何,找機會開台機器測試看看。

ALB 支援 Slow Start 了

這個功能在 ELB Classic 年代時有跟 AWS 提過,到 ALB 支援了 (總算...):「Application Load Balancer Announces Slow Start Support for its Load Balancing Algorithm」。

Application Load Balancers now support a slow start mode that allows you to add new targets without overwhelming them with a flood of requests. With the slow start mode, targets warm up before accepting their fair share of requests based on a ramp-up period that you specify.

然後時間可以設定,從 30 秒到 15 分鐘:

Slow start mode can be enabled by target group and can be configured for a duration of 30 seconds to 15 minutes. The load balancer linearly increases the number of requests sent to a new target in a target group up to its fair share during the slow start ramp-up window.

就之前的經驗來說,這在跑 PHP 的時候會很需要這個功能 (之前是在 F5 的設備上設定)。其他的語言因為性質不太一樣,可能不會這麼吃這個功能。

主要是因為 PHP 是在 request 進來時 compile 並且 cache。所以在機器剛起來時,儘量將 CPU 留給 opcache,把常用的頁面 compile 完並且放進 cache,而不是讓大量的連線灌進來,這樣對使用體驗不會太好... (要避免 CPU 吃滿 100% 很久,造成每個連線都很慢才跑完)

AWS 推出 Slow Start 後對 auto scaling 時的順暢度會好不少...

MySQL 版本的 Amazon Aurora 會將各種記錄丟到 CloudWatch Logs 了...

剛好今天才被問是不是可以在 Amazon Aurora (MySQL-Compatible Edition) 裡面翻出有哪些 Slow Query,剛好想到這幾天發表了這個功能:「Amazon Aurora Publishes General, Slow Query and Error Logs to Amazon CloudWatch」。

You can now configure the MySQL-compatible edition of Amazon Aurora to publish general logs, slow query logs, and error logs to Amazon CloudWatch Logs. Previously, you could only publish audit logs.

看起來是要另外開 (畢竟 CloudWatch Logs 不是免費的 XD),不過以這類型的 log 產生速度與數量來說應該還行...

PostgreSQL 的 Amazon RDS Database Preview Environment

AWS 推出了 PostgreSQL 試爆場讓大家測試 XDDD:「Amazon RDS Database Preview Environment is now available」。

可以測還沒有正式 release 的版本:

The Amazon RDS Database Preview Environment is now available, offering an environment for customers to easily test beta, release candidate, and early production versions of PostgreSQL database engine software with the convenience and flexibility of Amazon RDS.

這個產品定位有點奇怪...

Amazon EC2 推出 C5d instance:對 CPU 與 Disk 最佳化

AWS 推出了 C5d instance,同時針對 CPU 與 Disk 最佳化的機種:「EC2 Instance Update – C5 Instances with Local NVMe Storage (C5d)」。可以看出是在本地端掛上 NVMe 的方式在租用,價錢也不算高:

以帶了一個 local NVMe 的規劃來看,像是補 c3 系列產品線的感覺:

然後不是每個有 c5 的區域都會有 c5d,目前只有五區有:

C5d instances are available in On-Demand, Reserved Instance, and Spot form in the US East (N. Virginia), US West (Oregon), EU (Ireland), US East (Ohio), and Canada (Central) Regions. Prices vary by Region, and are just a bit higher than for the equivalent C5 instances.

AWS 推出 EC2 Fleet:直接混搭標準 EC2、Spot、RI 的計算

AWS 將本來 EC2Spot Fleet 加上了 EC2 Fleet,計算的公式從本來只有 Spot Instace,變成把標準 EC2 Instance 與 RI 的計算全部都納進來:「EC2 Fleet – Manage Thousands of On-Demand and Spot Instances with One Request」。

Today we are extending and generalizing the set-it-and-forget-it model that we pioneered in Spot Fleet with EC2 Fleet, a new building block that gives you the ability to create fleets that are composed of a combination of EC2 On-Demand, Reserved, and Spot Instances with a single API call.

不過目前有些服務還沒整,主要是跟 auto scaling 有關的部份,這部份應該是一次上一大包:

We plan to connect EC2 Fleet and EC2 Auto Scaling groups. This will let you create a single fleet that mixed instance types and Spot, Reserved and On-Demand, while also taking advantage of EC2 Auto Scaling features such as health checks and lifecycle hooks. This integration will also bring EC2 Fleet functionality to services such as Amazon ECS, Amazon EKS, and AWS Batch that build on and make use of EC2 Auto Scaling for fleet management.

整完以後對於要省成本就更簡單了...

CloudFront 在台北的第二個 PoP

Twitter 上看到了 Amazon CloudFront 宣佈了台北的第二個 PoP:

這個也是喊好久了,從去年就有消息一直到現在... 這樣台灣多了一個 backup,比較不會導去香港或是日本了。不過新 PoP 的代碼找不到,試著找 tsatpe 以及後面接數字,還是只有找到 tpe50,不知道是不是後來不露出代碼了...

t2 系列機器的 CPU credit 超出 Quota 的現象

在看 CPU credit 時發現 EC2 上有台 t2.micro CPU credit 一直掉,但是上面沒有跑什麼東西,所以先在內部的 Trac 上開張 ticket 追蹤... 然後這種事情都是一開 ticket 就馬上想到了 @_@

首先發現這些 CPU credit 是超出 max quota 144 的限制 (參考 AWS 的文件「CPU Credits and Baseline Performance」),就馬上想到是因為 t2 系列的機器在開機時會贈送 CPU credit 以避免開機時太慢 (參考文件「T2 Standard」),而贈送的這塊會優先使用,但不吃 max quota:

Launch credits are spent first, before earned credits. Unspent launch credits are accrued in the CPU credit balance, but do not count towards the CPU credit balance limit.

另外系統對每個帳號有限制,每個帳號每 24 小時在每區有 100 次的贈送限制:

There is a limit to the number of times T2 Standard instances can receive launch credits. The default limit is 100 launches or starts of all T2 Standard instances combined per account, per region, per rolling 24-hour period.

新帳號可能會更低,隨著使用情況調昇:

New accounts may have a lower limit, which increases over time based on your usage.

所以就知道為什麼會緩緩下降了,在到 144 之前都應該是下降的趨勢...

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