Tag Archives: cross

AWS 支援跨帳號丟 CloudWatch Events 了

Posted on July 2, 2017 by Gea-Suan Lin

以前要記錄行為會透過 AWS Lambda 轉丟到其他帳號下記錄，有一堆眉眉角角的東西要注意，現在則是直接支援了：「New – Cross-Account Delivery of CloudWatch Events」。文章裡有提到兩種用途，其中一種就是做安全性的記錄： Separation of Concerns – Customers would like to handle and respond to events in a separate account in order to implement advanced security schemes. 另外一種則是為了將記錄丟到同一個地方： Rollup – Customers are … Continue reading →

Posted in AWS, Cloud, Computer, Murmuring, Network, Security | Tagged account, amazon, aws, cloud, cloudwatch, cross, delivery, event | Leave a comment

SQL 的各種 JOIN

Posted on April 25, 2017 by Gea-Suan Lin

SQL 的各種 JOIN 其實是個很好玩的主題，不是很難，但沒有仔細練習過一次通常只能答出常用的那幾種... 而且過一陣子又會忘記 XD 這幾天不知道哪邊看到的舊文章「Say NO to Venn Diagrams When Explaining JOINs」，這篇作者大聲疾呼不要用 Venn diagram 解釋 SQL 的 JOIN，把比較特別的 JOIN 拿出來舉例... 因為 Venn diagram 是講集合交聯集這類的操作，但 JOIN 不僅僅是如此... 舉例來說，CROSS JOIN 對應到 cartesian product 就沒辦法用 Venn diagram 簡單的表示出來，而必須畫的更「具體」：

Posted in Computer, Database, Murmuring, Programming, Software | Tagged cartesian, cross, database, db, diagram, join, product, rdbms, sql, venn | Leave a comment

AWS 美東第二區開放

Posted on October 18, 2016 by Gea-Suan Lin

如同之前 AWS 的規劃，宣佈啟用美東第二區了 (us-east-2，在俄亥俄州)：「Now Open – AWS US East (Ohio) Region」。看了一下 EC2 的價錢，與 us-east-1 是同一個級別的，其他的服務應該是都差不多... 另外因為跨州了 (而且跟 us-east-1 很近)，所以官方也推薦拿來做異地服務： With just 12 ms of round-trip latency between US East (Ohio) and US East (Northern Virginia), you can make good use … Continue reading →

Posted in AWS, Cloud, Computer, Murmuring, Network | Tagged amazon, aws, az, cloud, cross, data, east, inter, ohio, pricing, rate, region, us | Leave a comment

Comodo 取消對 WoSign CA 的 Cross-signed

Posted on October 5, 2016 by Gea-Suan Lin

剛剛看到 Comodo 的 Rob Stradling 在群組上說明了 Comodo 透過 CRL 與 OCSP 取消對 WoSign CA 的 cross-signed：「Incidents involving the CA WoSign」。 Today we have revoked (via CRL and OCSP) all 3 of the cross-certificates that we'd issued to WoSign: https://crt.sh/?id=3223853 https://crt.sh/?id=12716343 … Continue reading →

Posted in Computer, Murmuring, Network, Security, WWW | Tagged authority, ca, certificate, comodo, cross, mozilla, privacy, security, signed, wosign | 1 Comment

Amazon Aurora 支援跨區域 Read Replica

Posted on June 3, 2016 by Gea-Suan Lin

傳統的作法 (自己擁有機房時) 就是在兩個機房中間建立 site-to-site VPN (通常是 IPsec)，然後再用 MySQL 的 replication 接起來，而現在 Amazon Aurora 直接在界面上支援這件事情，可以在網頁上點一點開起來：「New – Cross-Region Read Replicas for Amazon Aurora」。不過好像沒講到跨區的 VPC 對接設定問題？所以是透過他們自己的 network 接起來？這樣的話流量費用要怎麼算？

Posted in AWS, Cloud, Computer, Database, Murmuring, MySQL, Network, Software | Tagged amazon, aurora, aws, cloud, cross, database, db, mysql, read, region, replica | Leave a comment

HTTPS 因為安全性而不能使用 Referrer 的問題

Posted on February 22, 2016 by Gea-Suan Lin

在 Nuzzel 上看到老文章在討論 HTTPS 環境下因為安全性考量，而不能帶出 Referrer 的問題：「Where did all the HTTP referrers go?」。原文中「Fixing Referrers in HTTPS: The Meta Referrer」這邊就有提到 HTML5 meta referrer，也就是 W3C 的「Referrer Policy」，問題是到現在還是 Draft 啊... 也因為過了三年，其實 draft 裡面多了不少參數可以用： never 或 no-referrer 表示不傳。 origin 表示只傳 protocol + host … Continue reading →

Posted in Browser, Computer, Murmuring, Network, Security, Software, WWW | Tagged always, cross, default, downgrade, draft, edge, https, ie, meta, microsoft, never, no, origin, privacy, referer, referrer, unsafe, url, w3c, when | Leave a comment

Amazon API Gateway 支援 CORS 了

Posted on November 14, 2015 by Gea-Suan Lin

在「Enable CORS in Amazon API Gateway」這邊看到 Amazon API Gateway 支援 CORS (Cross-origin resource sharing) 了，這樣前端頁面就可以直接 call 進去使用了... 文件可以在「Enable CORS for a Method in API Gateway」這邊看到，主要就是這個頁面的設定：看起來是個小功能，但卻影響很大... 這代表又有一大塊開發者會進去研究。

Posted in AWS, Cloud, Computer, Murmuring, Network, Programming, Security, WWW | Tagged amazon, api, aws, cloud, cors, cross, gateway, javascript, js, origin, resource, sharing, web | Leave a comment

DynamoDB Streams...

Posted on July 17, 2015 by Gea-Suan Lin

去年 (2014) 十一月時 AWS 推出了 DynamoDB Streams，像是 RDBMS 裡 trigger 的東西，不過當時還沒這麼方便，而且也是 preview 階段：「Sneak Preview – DynamoDB Streams」。 Once you enable it for a DynamoDB table, all changes (puts, updates, and deletes) made to the table are tracked on a rolling … Continue reading →

Posted in AWS, Cloud, Computer, Database, Murmuring, Network, Software | Tagged amazon, aws, beanstalk, cloud, cloudformation, container, cross, database, db, dynamodb, ec2, elastic, lambda, preview, region, replication, service, streams, template, trigger | Leave a comment

Amazon S3 的 Cross-Region Replication

Posted on March 25, 2015 by Gea-Suan Lin

AWS 宣佈的新功能，自動 replicate 到其他區域的 Amazon S3 上：「New – Cross-Region Replication for Amazon S3」。需要打開 Versioning 的功能，然後就可以設定了：新上傳的 object 才會被 replicate，原先的 object 是不會有改變的。

Posted in AWS, Cloud, Computer, Murmuring, Network | Tagged amazon, aws, cross, region, replication, s3 | Leave a comment

Amazon CloudFront 的新增功能

Posted on June 28, 2014 by Gea-Suan Lin

Amazon CloudFront 新增了 Whitelist Header 的功能：「Deliver Custom Content With CloudFront」。如同在 post 裡說明的： If you choose the Whitelist option, each header that you add to the list becomes part of the cache key for the URLs associated with the distribution. … Continue reading →

Posted in AWS, CDN, Cloud, Computer, Murmuring, Network, Security, WWW | Tagged amazon, aws, cdn, cloudfront, cors, cross, header, http, origin, resource, sharing, vary, whitelist | Leave a comment

Tag Archives: cross

SQL 的各種 JOIN

Comodo 取消對 WoSign CA 的 Cross-signed

HTTPS 因為安全性而不能使用 Referrer 的問題

Amazon S3 的 Cross-Region Replication

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