Amazon 購物

最近因為amazon有滿60塊美金免運費的活動，所以上網站買了幾次，最近才發現他這滿60塊是指折扣前，而不像國內的購物網，都是要折扣後滿才能使用免運，然後網路找了一下，向下列這種有amazon的折扣網，滿適合拿來搭配你要買的東西，湊60塊免運門檻
https://gonglue.us/deals

台灣：電子圍籬智慧監控系統

台灣的電子圍籬智慧監控系統，主要是透過疾管署，每天會發送遭列管者的手機號碼給台灣的五大電信業者，而業者則會將手機定位固定上傳到電子平台。者要列管者離開系統劃分的基地範圍（包括關機），系統就會自動發送“告警簡訊”給當事者跟第一線的監控單位

Mac Wifi connection Dropping frequently

Recently My laptop MBP 2018 encounter the network issue frequently. The wifi will drop connection randomly. The symptom is lost connection with default gateway. Here is the note that I used to record what I did for troubleshooting.

1.check the wifi status

netwroksetup -getinfo Wi-Fi

netstat -nr -f inet

list all network devices to get wifi device id

networksetup -listhardwareports

The most WiFi device id is en0
networksetup -getairportpower en0

disable airdrop

sudo ifconfig awdl0 down

The Fix:
Disable WiFi
Open Finder
Press
Cmd+Shft+G
to go to the folder
/Library/Preferences/SystemConfiguration/
Delete (or move) the following files:
com.apple.airport.preferences.plist
NetworkInterfaces.plist
preferences.plist
Restart your computer
Re-enable WiFi

Ｗhat is blockchain(區塊鏈)

甲骨文這個影片介紹大概是我看過能在最短時間介紹blockchaing的影片了，不到一分鐘
區塊(Block)跟鍊(Chain)是兩個不同的東西
https://www.oracle.com/tw/blockchain/what-is-blockchain/

Azure storage queue API return "The value for one of the HTTP headers is not in the correct format."

The cause was possible backward incompatible issue. After the view researching, it could be resolved by changed the request header 'x-ms-version' from the one your library used to old one "2019-07-07"

How to trigger a kubenetes schedule job manually

kubectl create job --from=cronjob/[cronjob name] [new job] -n [namespace]
sometimes you may encounter the error such as
"error: unknown object type *v1beta1.CronJob"
it was caused by the kubectl is different version. you can download the old one to resolve issue

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.5", GitCommit:"c285e781331a3785a7f436042c65c5641ce8a9e9", GitTreeState:"clean", BuildDate:"2022-03-16T15:58:47Z", GoVersion:"go1.17.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.15", GitCommit:"0f9140665765825f8a4187cefd055e4b350b4a36", GitTreeState:"clean", BuildDate:"2021-09-17T23:04:02Z", GoVersion:"go1.15.15", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.23) and server (1.19) exceeds the supported minor version skew of +/-1
for me, my kubectl client is v1.23.5, but server is older version wiht v1.19.15, therefor I downgraded to the older one to resolve the issue
curl -LO https://dl.k8s.io/release/v1.19.15/bin/linux/amd64/kubectl

以銅為鏡可以正衣冠;以史為鏡可以知興替;以人為鏡可以明得失

人類總來都沒進步到哪裡去，歷史總是一而再再而三地重演，不管是俄侵烏發動的戰爭，或者現在政治上的紛亂，總是逃離不開歷史的重演