Category: Technology

Reading Time: 2 minutes (Update 12-04-022) Today a friend told me about another book, prealgebra, which is roughly about a 7th or 8th-grade math textbook in the USA. My daughter (7th grade) is doing the exercises on Afficient (this is a bit like the online version of the good old Kumon). (Original) In my daughters school, we started this

stlplace
March 16, 2022

Reading Time: < 1 minute High profile or high impact outage or incidents are just a way of the life in modern internet, or public cloud. The key is to recover quickly from the incident, and learn from those incidents: post mortem analysis, or in some places they do root cause analysis or RCA, and in my personal opinion, RCA

stlplace
February 4, 2022

Reading Time: < 1 minute I listened to or watched a few interesting youtube video and or twitter space recently. The most significant one is the “storytelling”, I believe this is probably as important as “compounding effect” in investing and life time learning. Below is the youtube video, how to speak, by Prof Patrick Winston of MIT Twitter Space (how

stlplace
January 22, 2022

Reading Time: < 1 minute I am thinking about this, also there was an ask from two parents. Some of the things I think I can start at first class, also some of the things I am thinking about teaching (more systematic). Starter: raspberry pi (and micro bit), coder master (Sophia’s game), the lego technic motor sets (not coding but

stlplace
December 30, 2021

Reading Time: 3 minutes For 12 factor application the No. 1 principle is one source code base. Today I was thinking about this topic: one sets of source code for one app, and use configuration for language, region or other different settings for different customers. And this reminded me of some of the articles I read (such as this

stlplace
November 11, 2021

Reading Time: 2 minutes Downloaded Noobs image installer (imager_1.6.2) to Mac, unpack (or install) so that I have “Raspberry Pi Imager” on Mac, and then used it to create the bootable OS on the sd card using that software. After that insert the sd card to the appropriate slot on p3, also plugged in hdmi for monitor, and usb

stlplace
November 7, 2021

Reading Time: < 1 minute (Update 4: 01-21-2022) Roblox published the root cause here. (Update 3: 11-03-2021) I came across this website that shows nice stats for Roblox (I noticed downdetector only shows 24 hours history by default, not sure how to customize it). I vaguley recall I also see a github repo that can scan the roblox APIs, but

stlplace
October 29, 2021

Reading Time: 2 minutes In a little over last year or so, I was involved in many technical interviews, and sometimes hiring decisions (one vote only, but a No vote is usually a No for the candidate). This is quite different from normal technical contributor’s job. But I learn something from this process too. I think overall I had

stlplace
December 10, 2020

Reading Time: < 1 minute Keytool The Most Common Java Keytool Keystore Commands import keytool -import -trustcacerts -alias root -file Thawte.crt -keystore keystore.jks (or cacerts) (keytool -keystore $CACERTS_STORE -storepass changeit -importcert -alias jfrog.root -file jfrog.root.cer -noprompt) list keytool -list -v -keystore $JAVA_HOME/jre/lib/security/cacerts create mulesoft keytool -genkey -keyalg RSA -alias <key-alias> -keystore <keystore-name>.jks sslshopper keytool -genkey -keyalg RSA -alias mydomain -keystore

stlplace
November 19, 2020

Reading Time: < 1 minute https://brandur.org/postgres-connections https://news.ycombinator.com/item?id=18220906 https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-Sizing

stlplace
November 17, 2020
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