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兩個都用 Slack 的公司可以直接在 Slack 上合作了

Slack 推出的新功能 Shared Channels:「Introducing Shared Channels: Where you can work with anyone in Slack」。

Shared Channels are a new kind of channel that connects two separate organizations, creating a common space for both sides to make use of Slack’s communication features and platform integrations when working together.

在截圖可以看到界面上,左半部會以 Shared Channels 顯示:

這邊也有提到 Shared Channels 需要透過管理員核准:

Accept the request: The other organization’s admin will receive a direct message from Slackbot, from which they can accept your request and add the channel to their workspace.

這樣就不用另外再開 guest 了...

Cloudflare 的 F-Root

Cloudflare 從三月底開始跟 ISC 簽約合作,服務 F-Root 這個 DNS Service (f.root-servers.net):「Delivering Dot」。

Since March 30, 2017, Cloudflare has been providing DNS Anycast service as additional F-Root instances under contract with ISC (the F-Root operator).

Linode 東京的機器上面可以看出來 www.cloudflare.com 走的路徑跟 f.root-server.net 相同:

gslin@one [~] [22:49] mtr -4 --report www.cloudflare.com
Start: Tue Sep 12 22:49:29 2017
HOST: one.abpe.org                Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|--               0.0%    10    0.6   0.6   0.5   0.6   0.0
  2.|--               0.0%    10    2.0   1.1   0.6   2.5   0.5
  3.|--               0.0%    10    0.7   1.0   0.7   2.1   0.3
  4.|--               0.0%    10    0.8   0.8   0.8   1.0   0.0
  5.|--             0.0%    10    0.7   0.7   0.7   0.8   0.0
gslin@one [~] [22:49] mtr -4 --report f.root-servers.net
Start: Tue Sep 12 22:49:46 2017
HOST: one.abpe.org                Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|--               0.0%    10    0.5   0.6   0.5   0.6   0.0
  2.|--               0.0%    10    0.7   0.7   0.6   0.8   0.0
  3.|--               0.0%    10    0.7   0.7   0.6   0.8   0.0
  4.|--               0.0%    10    0.8   0.8   0.8   0.8   0.0
  5.|-- f.root-servers.net         0.0%    10    0.8   0.8   0.7   0.8   0.0

而且也可以從監控發現,f.root-servers.net 的效能變好:

Using RIPE atlas probe measurements, we can see an immediate performance benefit to the F-Root server, from 8.24 median RTT to 4.24 median RTT.

DNS query 的量也大幅增加:

而且之後也會隨著 Cloudflare 的 PoP 增加而愈來愈快... 在原文的 comment 也提到了 Cloudflare 也有打算跟其他的 Root Server 合作,所以看起來會讓整個 infrastructure 愈來愈快而且穩定。

另外這也代表台灣在本島也會直接連到 F-Root 了,不過 HiNet 自己也有 F-Root,所以 HiNet 的部份就沒什麼差...

Homebrew 蒐集到的安裝資訊

在「Homebrew Analytics Install On Request Events — Homebrew」這邊,Homebrew 利用了傳回來的資訊算出 2016/07/14 到 2017/07/14 的安裝套件次數,列出前一千名。(我是把他關掉,因為隱私問題不想要傳出去... 參考「Homebrew 會將安裝資訊送到 Google Analytics 上」這篇。)

比較有趣的是第一名的 node 超級多,比第二名加第三名的 git + wget 還多...

拿來翻一翻還 ok,順便看一下大家用什麼...

AWS 推出新的 Load Balancer:NLB (Network Load Balancer)

從一開始推出的 ELB (Elastic Load Balancer),到 ALB (Application),現在則推出了 NLB (Network):「New Network Load Balancer – Effortless Scaling to Millions of Requests per Second」。


  1. Static IP Addresses
  2. Zonality
  3. Source Address Preservation
  4. Long-running Connections
  5. Failover

雖然不能確定 AWS 用的技術是什麼,但這裡面有好幾個很明顯就是 DSR (Direct Server Return) 架構的特性 (包括了限制與優點)。

另外也因為不用處理 L7 的內容,效能比起 ELB/ALB 好很多,夠大的用量下,價錢也低不少。對於不少非 HTTP/HTTPS 的應用應該很好用,就算是 HTTP/HTTPS,單純一點的應用應該也不錯...

KeyCDN 的台灣 PoP...

GCP 推出 Standard Tier 後,KeyCDN 就利用台灣的 GCP 機房建立了 PoP:「KeyCDN Launches New POP in Taiwan」。

GCP 在台灣的 Standard Tier 價錢是:

Source geolocation of traffic0-10 TB10-150 TB150-500 TB
From Asia$0.11$0.075$0.07

KeyCDN 亞洲區頻寬的價錢則是 USD$0.12/GB,加上機器費用,有機會不虧?

在 AWS 的 NGINX Plus

主要是看到「Quick Start Update: Deploy NGINX Plus on the AWS Cloud」這篇才知道在 AWS Marketplace 上有「NGINX Plus - Amazon Linux AMI (HVM)」可以用,而且有三十天試用期可以使用:

30 Day Free Trial Available - NGINX Plus is a high performance load balancer, edge cache and origin server for web content, streaming media and API traffic. It complements the load balancing capabilities of Amazon ELB and ALB by adding support for multiple HTTP, HTTP/2, and SSL/TLS services, content-based routing rules, caching, autoscaling support, and traffic management policies. NGINX Plus for AWS is provided and supported by the original creators of NGINX web server.

所有機器的年約都是 USD$2500/year,使用 t2.{nano,micro,small} 的話因為 hourly 的價錢乘以一年後反而還比較便宜,記得別亂買...

另外這代表可以直接付錢測試功能... (或是免費,如果 free trial 還沒用)

Amazon Route 53 對地區的微調功能

Amazon Route 53 推出新功能,針對地區微調資源的比重:「Amazon Route 53 Traffic Flow Announces Support For Geoproximity Routing With Traffic Biasing」。


For example, suppose you have EC2 instances in the AWS US East (Ohio) region and in the US West (Oregon) region. When a user in Los Angeles browses to your website, geoproximity routing will route the DNS query to the EC2 instances in the US West (Oregon) region because it's closer geographically. If you want a larger portion of users in the middle of the United States to be routed to one region, you can specify a positive bias for that region, a negative bias for the other region, or both.

有點 CDN 的想法在裡面...

AWS ALB 可以設定 IP address 當作後端伺服器了

AWS ALB 推出直接設定 IP address 當作後端伺服器的功能:「New – Application Load Balancing via IP Address to AWS & On-Premises Resources」。

ip – Targets are registered as IP addresses. You can use any IPv4 address from the load balancer’s VPC CIDR for targets within load balancer’s VPC and any IPv4 address from the RFC 1918 ranges (,, and or the RFC 6598 range ( for targets located outside the load balancer’s VPC (this includes Peered VPC, EC2-Classic, and on-premises targets reachable over Direct Connect or VPN).

這樣就能拿 ALB 當 load balancer 把部份內容接到自己機房內的伺服器群了,一種隨便串的概念... (可以透過 AWS Direct Connect 或是 VPN 直接串,所以對外的部份就直接是 AWS 端,對內要怎麼接就隨便接...)