Home » Posts tagged "environment"

幫你在本機產生 localhost 的 SSL Certificate

mkcert 這個工具可以產生出讓系統 (包括瀏覽器) 信任的 https://localhost/:「mkcert: valid HTTPS certificates for localhost」。

先建立 CA 的 root key 與 root certificate,然後把 root certificate 塞到系統與各軟體的信任清單內,再產生 localhost 的 key 與 certificate 出來給前面的 CA root key 簽名。把這些事情包裝起來就是 mkcert 了。

拿來開發軟體時比較方便一點,HSTS 的程式碼就可以全環境共用了...

Amazon DynamoDB 提供 Docker Image 讓開發者可以在本地端測試

AWS 推出了 Amazon DynamoDB 的相容 Docker Image,讓開發者可以在本地端測試 DynamoDB 的 API:「Use Amazon DynamoDB Local More Easily with the New Docker Image」,在 amazon/dynamodb-local 這邊可以拉到,裡面其實是包 Java:

DynamoDB local is now available to download as a self-contained Docker image or a .jar file that can run on Microsoft Windows, Linux, macOS, and other platforms that support Java.

這樣在 Continuous Integration (CI) 的過程裡面也可以拉起 service 測試...

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.


用 pipsi 管 Python 的 command line 工具...

在「My Python Development Environment, 2018 Edition « Jacob Kaplan-Moss」這邊看到 Python 開發有哪些工具可以用 (介紹了三個),其中管理不同 Python 版本的 pyenv 用一陣子了,另外兩個則是之前沒用過...

pipsi 是將套件用 virtualenv 包起來,讓使用者在用的時候不會受到其他環境的干擾。我是拿來跟系統的 python3 (目前在 Ubuntu 16.04 上是指到 3.5.1) 使用,所以安裝 pipsi 時先切到 system 再透過 python3 安裝 (讓他偵測到系統的 python3):

$ pyenv shell system
$ which python3
$ curl https://raw.githubusercontent.com/mitsuhiko/pipsi/master/get-pipsi.py | python3

接著把 PATH 參數設好後 (設到 .bashrc 或是 .zshrc 之類的檔案),重新開一個 terminal 或是 shell (讓路徑生效),再把 awscli 裝進去:

$ pipsi install awscli

這樣這些工具就會吃系統的 python3 了...

2011 年的研究,開放辦公室與病假的關聯性

忘記從哪邊冒出來的連結,反正是個 2011 年的研究:「Sickness absence associated with shared and open-plan offices--a national cross sectional questionnaire survey.」。2011 年在丹麥的研究:

METHODS: The analysis was based on a national survey of Danish inhabitants between 18-59 years of age (response rate 62%), and the study population consisted of the 2403 employees that reported working in offices. The different types of offices were characterized according to self-reported number of occupants in the space. The log-linear Poisson model was used to model the number of self-reported sickness absence days depending on the type of office; the analysis was adjusted for age, gender, socioeconomic status, body mass index, alcohol consumption, smoking habits, and physical activity during leisure time.

都是與 cellular office 比較,可以看出大於六個人的開放辦公室病假的量高出許多:

RESULTS: Sickness absence was significantly related to having a greater number of occupants in the office (P<0.001) when adjusting for confounders. Compared to cellular offices, occupants in 2-person offices had 50% more days of sickness absence [rate ratio (RR) 1.50, 95% confidence interval (95% CI) 1.13-1.98], occupants in 3-6-person offices had 36% more days of sickness absence (RR 1.36, 95% CI 1.08-1.73), and occupants in open-plan offices (>6 persons) had 62% more days of sickness absence (RR 1.62, 95% CI 1.30-2.02).

CONCLUSION: Occupants sharing an office and occupants in open-plan offices (>6 occupants) had significantly more days of sickness absence than occupants in cellular offices.

看起來只是拉數字出來分析... 另外信心區間的洞好大 XD

eBay 在測試環境下的 Load Balancer:Neutrino

eBay 放出了一套為了測試環境用 ScalaNetty 開發的 load balancer,Neutrino:「Announcing Neutrino for Load Balancing and L7 Switching」。

可以看到設計上加入了 log 機制,像是:

Ability to send the traffic logs to API endpoints


Traffic metrics and configuration are exposed as APIs.

Metrics can be easily published to Graphite. Neutrino is also extensible to push metrics to other metrics systems.

效能不是最主要的重點,不過在 2-core VM 裡面可以有每秒 300+ requests,對測試環境應該是夠用:

We have measured upwards of 300+ requests per second on a 2-core VM.

還有不少特殊的功能 (大量模組化的設計),對於測試環境應該頗好用?