投稿時間:2022-07-30 19:21:03 RSSフィード2022-07-30 19:00 分まとめ(25件)

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IT	ITmedia 総合記事一覧	[ITmedia PC USER] 「ThinkPad」が生まれて30年　次の30年を占う2022年モデルはどんな感じ？	https://www.itmedia.co.jp/pcuser/articles/2207/30/news091.html	ITmediaPCUSER「ThinkPad」が生まれて年次の年を占う年モデルはどんな感じ年、当時のIBMが「ThinkPadC」を発売した。	2022-07-30 18:45:00
python	Pythonタグが付けられた新着投稿 - Qiita	不連続なグラフを綺麗に書く	https://qiita.com/take_me/items/d6bab9f71211c91269b0	abstract	2022-07-30 18:31:10
Ruby	Rubyタグが付けられた新着投稿 - Qiita	【日付計算】Rubyで◯時間前、◯日前、◯ヶ月前、◯年前と計算するメソッド	https://qiita.com/Jackpackeeer/items/b4af9a3f183dcb047cae	qiita	2022-07-30 18:18:51
Docker	dockerタグが付けられた新着投稿 - Qiita	VueをDockerコンテナ内で動かしているときにホットリロードが利かない問題	https://qiita.com/yamazaki-uhc/items/d0332c4e899b361a6936	requirevuecliservicemodu	2022-07-30 18:12:45
Ruby	Railsタグが付けられた新着投稿 - Qiita	【日付計算】Rubyで◯時間前、◯日前、◯ヶ月前、◯年前と計算するメソッド	https://qiita.com/Jackpackeeer/items/b4af9a3f183dcb047cae	qiita	2022-07-30 18:18:51
技術ブログ	Developers.IO	【Minecraft for AWS】ลองสร้างเซิร์ฟเวอร์ Minecraft ด้วย EC2 Instance	https://dev.classmethod.jp/articles/lets-build-minecraft-server-with-aws-ec2-instance/	【Minecraft for AWS】ลองสร้างเซิร์ฟเวอร์Minecraft ด้วยEC Instanceต้าจากTechnical Support Team ครับ เกี่ยวกับSeries Minecraft for AWS ผมคิดว่ามันคงน่าสนุกถ้าเราได้ใช้Mi	2022-07-30 09:31:49
技術ブログ	Developers.IO	Amazon EventBridge API destinations で Microsoft Teams へ通知させる	https://dev.classmethod.jp/articles/eventbridge-teams/	awslamnda	2022-07-30 09:18:02
技術ブログ	Developers.IO	AWS IoT Core คืออะไร? การแนะนำฟังก์ชันล่าสุดของ AWS ในปี 2022	https://dev.classmethod.jp/articles/what-is-aws-iot-core-2022/	AWS IoT Core คืออะไร การแนะนำฟังก์ชันล่าสุดของAWS ในปีเกี่ยวกับAWS IoT Core AWS IoT architecture มีโครงสร้างบริการที่หลากหลายและAWS IoT Core ก็เป็นหนึ่งในบริการเ	2022-07-30 09:15:15
海外TECH	Ars Technica	Milky seas, a bioluminescent event visible from space	https://arstechnica.com/?p=1869910	bioluminescent	2022-07-30 09:00:56
海外TECH	DEV Community	You need to learn Kubernetes RIGHT NOW!! 🚀	https://dev.to/iarchitsharma/you-need-to-learn-kubernetes-right-now-583d	You need to learn Kubernetes RIGHT NOW Why Should I learn Kubernetes Because Kubernetes can deploy Docker containers with just one command This article is for those who want to learn Kubernetes as a beginner This article takes an example of scaling a website to make you understand the concept of Kubernetes Prerequisites Computer NetworkingDockerWhat is Kubernetes Kubernetes Ks is a portable extensible open source platform for managing containerized workloads and services that facilitates both declarative configuration and automation ‍Did not get it ️ I know Let me explain Kubernetes solves a major problem with docker containers or any type of container ️Let s look at the problem with Docker by creating a cookie websitewhere we ll sell cookiesand deploy it on a docker container because of its great isolated environment better resource use and so on Problem with Docker NOTE In this blog I will not guide you through the process of creating and running a website in Docker I am only using a situation to demonstrate the issue So I have deployed our cookies website cookies com in our Docker container and now guess what people are purchasing our cookieslike crazy and our website is doing so well a bit too well in fact that it can t take it and is crashing Not only that but the server or host️it s operating on has gone down a few times causing a few outages How do we solve it Let s create another host️so that we may run our second container on another host which is quite simple using Docker Just one simple command and you re done But wait we re not done yet because we need to ensure that when people click cookies com when they visit the website it can go to this server  or the server which is normally done with a load balancer so we need to find out how to do a load balancer Now both servers are being used since they are load balanced so if one goes down the other remains running People are loving our cookies and they re coming to the website in large numbers We re receiving a lot of views visits and purchases Our servers can t take it anymore and they re crashing again so what do we do Everytime we add new servers we also have to setup a container for that server then to setup load balancer and if our website crash again as our website traffic keeps on increasingWe have to repeat the process We need a solution We need to automate this or orchestrate it in some way perhaps using container orchestration Problem Solution This is where Kubernetes Ks comes into play It will handle all the junk Let s see how A part of the setup has already been done as Kubernetes is a container orchestrator so we ll still need servers and some sort of container runtime which in our case will be Docker Kubernetes will basically help us make Docker better So where do we begin Kubernetes Architecture We ll first introduce a new server someone who will be in charge of our servers and we are going to call it Master component Master is the one who instructs them what to do and keeps them on track We do need to include our servers in the team therefore we ll install Kubernetes on these servers which will include two components that is Kube Proxy and kubelet They are now part of the team after installing those two components along with their container runtime which in our case is Docker These servers or machines are called Worker Nodes mostly referred as Nodes These components are just a way for the Master to control them Kubelet Kubelet is just a Kubernetes process that makes it possible for the cluster to talk to each other or communicate with each other and execute some task on those Nodes like running application processes Kube proxy Kube proxy is a network proxy load balancer that implements the Service abstraction It programs the iptables rules onthe node to redirect service IP requests to one of its registered backend pods What is Kubernetes cluster A Kubernetes cluster is a collection of Node machines Master is a server or Node like any other but it has certain specific components and tasks that we have assigned to it Master have four jobs or components that is Kubernetes API Server Scheduler Controller Manager and etcd These are nothing but just processes running on Master Nodes that are absolutely necessary to run and manage the Cluster properly Kubernetes API Server API Server is an entry point to the Kubernetes cluster This is the process to which different Kubernetes client will talk to like UI User Interface if you are using Kubernetes dashboard an API if you are using some scripts and automating technologies and a CLI Command Line Interface Controller Manager Controller Manager basically keeps an overview of what s happening in the cluster whether something needs to be repaired or maybe if a container stopped and it needs to be restarted etc Scheduler Scheduler is basically responsible for scheduling containers on different Nodes based on the workload and available server resources on each Node So it s an intelligent process that decides on which worker Node the next container should be scheduled based on available resources on Worker Nodes etcd It s an key value storage which basically holds at any time the current state of the Kubernetes cluster so it has all the configuration data inside and all the status data of each Node and each container inside of that Node The backup and restore is actually from these etcd snapshot because you can recover the whole cluster state using that etcd snapshot What is Virtual Network Virtual Network is also a very important component of Kubernetes which enables Worker Nodes and Master Nodes talk to each other It basically turns all the Nodes inside of a cluster into one powerful machine that has sum of all the resources of individual Nodes Thing to be noted here is that Worker Nodes has most load because they are running the actual application so they are much bigger and have more resources Whereas Master Node will just be running handful of master processes so it doesn t need much resources However Master Node is much more important than Individual Worker Nodes because if you lose a Master Node access you will not be able to access the cluster anymore and that means you absolutely have to have a backup of your Master Node at any time In Production environment usually you would have at least two Master Nodes but you can have multiple Master Nodes So if one Master Node goes down the cluster will still run smoothly because you have other masters available In the next article we ll take a look at Main Kubernetes Components and will talk about them one by one in detail Thank you for reading this blog do follow me	2022-07-30 09:13:00
海外TECH	DEV Community	Black Line Follower with Arduino	https://dev.to/ndrohith/black-line-follower-with-arduino-4mje	Black Line Follower with ArduinoIn this blog I will show you how to build a black line follower robot with an Arduino microcontroller and IR Sensors Components requiredArduino UNO IR Sensor Gear Motors IC LD Arduino UNOArduino is an opensource electronics platform based on easy to use hardware and software Arduino boards are able to read inputs light on a sensor a finger on a button or a twitter message and turn it into an output activating a motor turning on a LED publishing something online To do so use the Arduino programming language based on wiring and the Arduino Software IDE based on processing IR SensorAn infrared sensor is an electronic device that emits and or detects infrared radiation in order to sense some aspects of its surroundings Gear MotorsIt is a DC motor with a gear box for decreasing the speed and increasing the torque and power This type of motors is commonly used for robotic applications IC LDIC LD is a dual H bridge motor driver integrated circuit that can drive current of up to mA with voltage range of to volts Codeint leftir int rightir int leftmotor int leftmotor int rightmotor int rightmotor void setup Serial begin pinMode leftir INPUT pinMode rightir INPUT pinMode leftmotor OUTPUT pinMode leftmotor OUTPUT pinMode rightmotor OUTPUT pinMode rightmotor OUTPUT void loop if digitalRead leftir HIGH amp amp digitalRead rightir HIGH digitalWrite leftmotor HIGH digitalWrite leftmotor LOW digitalWrite rightmotor HIGH digitalWrite rightmotor LOW Serial println FORWARD if digitalRead leftir HIGH amp amp digitalRead rightir LOW digitalWrite leftmotor HIGH digitalWrite leftmotor LOW digitalWrite rightmotor LOW digitalWrite rightmotor HIGH Serial println LEFT if digitalRead leftir LOW amp amp digitalRead rightir HIGH digitalWrite leftmotor LOW digitalWrite leftmotor HIGH digitalWrite rightmotor HIGH digitalWrite rightmotor LOW Serial println RIGHT if digitalRead leftir LOW amp amp digitalRead rightir LOW digitalWrite leftmotor LOW digitalWrite leftmotor HIGH digitalWrite rightmotor LOW digitalWrite rightmotor HIGH Serial println BACKWARD	2022-07-30 09:07:33
ニュース	BBC News - Home	Ukraine war: UN and Red Cross should investigate prison deaths, says Ukraine	https://www.bbc.co.uk/news/world-europe-62356211?at_medium=RSS&at_campaign=KARANGA	donetsk	2022-07-30 09:36:05
ニュース	BBC News - Home	Kentucky: At least 19 dead in worst Appalachia floods for years	https://www.bbc.co.uk/news/world-us-canada-62351166?at_medium=RSS&at_campaign=KARANGA	geologist	2022-07-30 09:15:21
ニュース	BBC News - Home	Commonwealth Games: David Weir punctures as Johnboy Smith wins Men's T53/54 Wheelchair Marathon gold	https://www.bbc.co.uk/sport/commonwealth-games/62360275?at_medium=RSS&at_campaign=KARANGA	Commonwealth Games David Weir punctures as Johnboy Smith wins Men x s T Wheelchair Marathon goldEngland s Johnboy Smith wins the Men s T Wheelchair Marathon after compatriot David Weir suffers a puncture when leading	2022-07-30 09:28:37
北海道	北海道新聞	後志管内２５６人感染　３日連続２００人超　新型コロナ	https://www.hokkaido-np.co.jp/article/712080/	新型コロナウイルス	2022-07-30 18:38:05
北海道	北海道新聞	自然災害、米各地で相次ぐ　南部で洪水、２５人死亡	https://www.hokkaido-np.co.jp/article/712120/	自然災害	2022-07-30 18:37:00
北海道	北海道新聞	ＧＰＳでストーカー疑い、苫小牧の男逮捕　道内初適用	https://www.hokkaido-np.co.jp/article/712117/	適用	2022-07-30 18:35:20
北海道	北海道新聞	横浜隼人と開志学園が勝つ　女子野球、決勝は甲子園	https://www.hokkaido-np.co.jp/article/712119/	兵庫県丹波市	2022-07-30 18:32:00
北海道	北海道新聞	維新、８月２７日に新代表選出　党大会で松井氏辞任承認	https://www.hokkaido-np.co.jp/article/712118/	日本維新の会	2022-07-30 18:32:00
北海道	北海道新聞	牛襲う「忍者グマ」オソ１８出現か？　標茶町のカメラが撮影	https://www.hokkaido-np.co.jp/article/712102/	釧路管内	2022-07-30 18:28:59
北海道	北海道新聞	防災訓練、コロナ禍で半減　住民の自主組織集まれず	https://www.hokkaido-np.co.jp/article/712115/	地域住民	2022-07-30 18:28:00
北海道	北海道新聞	「エヴァンゲリオン」ジオラマで再現　網走市立美術館でフィギュア展	https://www.hokkaido-np.co.jp/article/712113/	庵野秀明	2022-07-30 18:16:00
北海道	北海道新聞	牧島デジタル相が道情報大視察　江別	https://www.hokkaido-np.co.jp/article/712114/	牧島かれん	2022-07-30 18:22:00
北海道	北海道新聞	北大博物館、構内の植物標本化し一般公開「気軽に触れて」	https://www.hokkaido-np.co.jp/article/712112/	一般公開	2022-07-30 18:12:24
北海道	北海道新聞	平城宮跡出土の木球、「打毬」か　奈文研が分析、貴族に流行	https://www.hokkaido-np.co.jp/article/712111/	平城宮跡	2022-07-30 18:03:00