投稿時間:2021-06-02 04:22:23 RSSフィード2021-06-02 04:00 分まとめ(25件)

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AWS	AWS Database Blog	Upgrade Amazon RDS for MySQL or MariaDB database schemas with minimal downtime	https://aws.amazon.com/blogs/database/upgrade-amazon-rds-for-mysql-or-mariadb-database-schemas-with-minimal-downtime/	Upgrade Amazon RDS for MySQL or MariaDB database schemas with minimal downtimeModifying the schema of an SQL database can be time consuming resource intensive and error prone and often requires long application maintenance windows that negatively affect the end user experience Amazon Relational Database Service Amazon RDS nbsp for MySQL or MariaDB allows you to upgrade your schema while your application is still running with minimal or zero downtime In this post …	2021-06-01 18:01:26
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	pandas python .replace 最後の改行だけ消去したい	https://teratail.com/questions/341664?rss=all		2021-06-02 03:54:33
海外TECH	Ars Technica	Xiaomi’s 200 W phone charger goes from 0-100% in 8 minutes	https://arstechnica.com/?p=1768896	charger	2021-06-01 18:10:50
海外TECH	DEV Community	Distributed Load Testing in JMeter using VirtualBox	https://dev.to/qainsights/distributed-load-testing-in-jmeter-using-virtualbox-188k	Distributed Load Testing in JMeter using VirtualBoxIn this blog article we are going to use how you can run distributed load testing in JMeter using VirtualBox setup I have already posted videos about distributed load testing on AWS and Raspberry Pi You need more than one machine to run the load tests But in this guide you will use only your machine and run the JMeter tests by leveraging the VirtualBox software Why distributed load testing By using one machine you may not be able to inject more load to your application under test If you want to stress test your application you need more threads Your system resource utilization will reach its limits if you are trying to inject more threads To inject more load you need to more machines to scale horizontally JMeter has Master Worker mode where you can run your tests in server mode You will have one master machine with multiple worker machines master machine will send the instructions to worker machines After receiving the instructions worker machines will execute the test plan as per the design If you want more load you need more machines Here is the video version of this guide PrerequisitesIdeally you need multiple machines to setup this master worker But for this demo we are going to make use of VirtualBox to learn the concept of distributed load testing This set up is not ideal for production usage as we are not using the multiple machines to inject the load Following are the prerequisites required Oracle VM VirtualBox ManagerCentOS image or your favorite Linux distro CentOS Image DownloadTo download the CentOS image visit direct link click on the latest version of the image make sure you are downloading the bit version CentOS Image downloadTo view the credentials click on Info tab as shown below CentOS Image CredentialsAfter downloading the image extract it using z software After extraction you will get vdi file Oracle VM VirtualBox Manager DownloadTo download the VirtualBox visit and click on Download button Using the VirtualBox you can run multiple guest operating systems locally JMeter Master and Worker Machines SetupNext step is to setup two machines JMeter Master and JMeter Worker in VirtualBox using the CentOS image First let us create the CentOS base image from which we are going to clone it for two machines Launch VirtualBox click on New button to create a new virtual machine as shown below Create new virtual machineIn Create Virtual Machine dialog box configure the settings as shown below Create new virtual machine configClick on the yellow icon as shown above to map the downloaded vdi file Then click on Add button to map the vdi file and then click on Choose as shown below Create new virtual machine configNow back to Create Virtual Machine dialog click on Create button This will create a new virtual machine named CentOS Base Create new virtual machine CentOS Base Image configurationBefore we start cloning this machine we need to configure the network settings Select the CentOS Base image right click gt Settings Click on Network in CentOS Base Settings Select Bridged Adapter as shown below then click on OK Bridged AdapterThis will create the bridged network and also you can access the internet from this virtual machines Cloning the Virtual MachinesNext step is to clone this machine to create JMeter Master and JMeter Worker machines Right click on the CentOS Base machine then click on Clone In Clone Virtual Machine dialog box configure the below settings as is Then click on Clone This will create a new virtual machine named JMeter Master CloningRepeat the same steps again to create JMeter Worker After creating two machines in the manager you will see three machines as shown below List of machinesStarting the Virtual MachinesNext step is to start the JMeter Master and JMeter Worker machines Select the machine and then click on Start button as shown below Starting the virtual machineThis will start the two machines which will take couple of minutes for the complete bootup After successful boot you will see the login screen for both the machines as shown below Enter the password and hit enter to login into the machines CentOS Login ScreenAfter logging in launch the Terminal to make changes in the hosts and host name You have to repeat the steps for both the machines To change the host name enter the below command and name your host as jmetermaster sudo vi etc hostnameTo change the hosts file enter the below command and configure as shown in the below screenshot sudo vi etc hostsChanging the hostsIt is time to restart the machines Enter the below command to restart shutdown now rAfter restart login again and get the IP address using the below command ifconfigMinimize the virtual machine windows because it will be hard to navigate Instead we can use the SSH to login and perform the commands To login into the virtual machines I am using MobaXterm software But you can use your favorite Installing Java in Master and Worker MachinesAfter you login into the master worker machine the first step is to download and install Java To install Java you can use the below command sudo yum install java yThis will install Java To verify you can issue the below command java versionJava version checkRepeat the same steps for Worker machine as well Installing JMeter in Master and Worker MachinesTo install JMeter you can use the below command curl O This will download the tar file from JMeter site To veriy the integrity you can issue the below command shasum apache jmeter tgzThe output string must match with the SHA value which you can get it from the JMeter site JMeter DownloadTo extract the tar file tar xzf apache jmeter tgzNow cd into bin folder cd apache jmeter bin Repeat the above steps in both the machines Distributed Load Testing ModeJMeter Master SetupIn the master machine open the user properties using your favorite editor and configure the below properties vim user propertiesuser propertiesremote hosts lt worker ip gt server rmi localport By default JMeter uses secured communication between the master and worker machines To generate the secured tunnel we need to make use of rmi key store To add multiple workers use comma separated values Execute create rmi keystore sh file to generate the keystore file as shown below Let us go with the default values rmi as first and last name and the password as changeitkeystore generationrmi keystore jks will be generated in the bin folder You have to place this file in all the worker machines To transfer this file to the worker machine you can use scp command scp rmi keystore jks osboxes lt worker ip gt Above command transfer the keystore to the home directory of the worker machine Next step is to disable to firewall service If the firewall is enabled JMeter tests will not run in distributed mode To disable firewall sudo systemctl stop firewalld serviceTo check firewall status sudo systemctl status firewalld serviceJMeter Worker SetupOpen a new SSH session to login into worker machine The keystore file now present in the home directory paste that into bin folder Next step is to configure the user properties Open it in your favorite editor and configure the below property server rmi localport Now disable the firewall by following the above mentioned steps Starting the Distributed Load Mode in Worker MachineTo begin the distributed load testing first step is to start the worker machine Issue the below command to get started jmeter server Djava rmi server hostname lt Worker IP gt OutputWorker Machine StartupIf you get the above output you are good Starting the Distributed Load Testing in Master MachineTo begin the distributed load test you can issue the below command jmeter sh Djava rmi server hostname lt Master IP gt n t examples CSVSample jmx l Run log R lt Worker IP gt Above command start the sample JMeter test which is located in examples folder store the output in current directory named Run log the load will be injected using the remote worker machine R JMeter Master OutputJMeter Master OuputJMeter Worker OutputJMeter Worker Output Distributed Load Testing in JMeter using VirtualBoxImportant PointsUse the identical version of Java and JMeter in all the machinesDisable firewallMaster and Worker machines must be in the same subnettry pinging the machines from each other to verify the connectivitySSL for RMI certificate has the validity of days by default make sure you generate the certificate once in days The number of days can be changed in the create rmi keystore file  keytool genkey keyalg RSA alias rmi keystore rmi keystore jks storepass changeit validity keysize If the test plan uses plugins and or CSV Data set config make sure it is available in the worker nodesHere is the GitHub Repo to star GitHub Repo Remote Distribution Load Testing in JMeter lt wp button gt ConclusionFor beginners this setup might be overwhelming but this guide will be very helpful to understand the setup without needing of multiple machines This setup should not be used in production this is just for learning purpose	2021-06-01 18:47:20
海外TECH	DEV Community	The 7 Most Popular DEV Posts from the Past Week	https://dev.to/devteam/the-7-most-popular-dev-posts-from-the-past-week-56g3	The Most Popular DEV Posts from the Past WeekEvery Tuesday we round up the previous week s top posts based on traffic engagement and a hint of editorial curation The typical week starts on Monday and ends on Sunday but don t worry we take into account posts that are published later in the week Slow and steady wins the race ruppysuppy has some great tips to share about improving your GitHub profile ーspoiler go slow and don t try to cheat the process Beautify Your GitHub Profile like a Pro Tapajyoti Bose・May ・ min read git github markdown tutorial Conscious accessibility eevajonnapanula s very first sentence is a great indication of how helpful and compelling the rest of the article is We as developers tend to develop sites unconsciously for people like ourselves If we don t actively pay attention the sites are often accessible only for certain types of people So very true Don t Develop Just for Yourself A Developer s Checklist to Accessibility Eevis she her ・May ・ min read ay html webdev css Testing TypeScript dastasoft s post is all about going through the basics of TS and understanding the benefits so you can decide if you want those benefits or not Pretty helpful stuff Here s what every React Developer needs to know about TypeScript Part dastasoft・May ・ min read beginners react javascript typescript Decluttering ーfast If you re like me yomdroid s article about how you can sweep out your inbox with Python is both extremely applicable and a little triggering Thank you for sharing Ogheneyoma I need to try this Decluttering Mailbox Using Python Ogheneyoma Obomate Okobiah・May ・ min read python email The good the bad and the booleanThe TL DR of this overview from mpocock Bad booleans represent state Good booleans are derived from state That said there s so much more to glean from the entire article State Management How to tell a bad boolean from a good boolean Matt Pocock・May ・ min read webdev tutorial Save the date ️Congrats to christinecontreras on their upcoming nuptials I love that your wedding planning prep includes building an app to predict the best date to get married based on historical weather patterns and location lt Perfect Date A Javascript and API Project Christine Contreras・May ・ min read javascript beginners flatiron webdev Resetting your Git knowledgeIf you are confused about much of the terminology in Git you are FAR from alone Thank you for clearing some of it up for us pragativerma Confusing Terms in the Git Terminology Pragati Verma・May ・ min read opensource github codenewbie computerscience That s it for our weekly wrap up Keep an eye on dev to this week for daily content and discussions and if you miss anything we ll be sure to recap it next Tuesday	2021-06-01 18:45:47
海外TECH	DEV Community	Google Stock Price Prediction Using LSTM-RNN	https://dev.to/gauravsingh9356/google-stock-price-prediction-using-rnn-lstm-5a2h	Google Stock Price Prediction Using LSTM RNNRecurrent Neural Networks can Memorize remember previous inputs in memory When a huge set of Sequential data is given to it These loops make recurrent neural networks seem kind of mysterious However if you think a bit more it turns out that they aren t all that different than a normal neural network A recurrent neural network can be thought of as multiple copies of the same network each passing a message to a successor Made Google Stock Price PredictorGithub Link	2021-06-01 18:29:55
海外TECH	DEV Community	DevTools Tip of the day: The Console dollars	https://dev.to/ishtiaq156/devtools-tip-of-the-day-the-console-dollars-476j	DevTools Tip of the day The Console dollars is a reference to the currently selected html node in the Elements pane Also is the one selected previously the one before that etc up to the number You can use that additional references to try out some relative operations e g appendChild and in the console is an alias for the lengthy document querySelector method That s if you don t already have variable defined in your app e g jQuery is an even bigger timesaver because it not only runs document QuerySelectorAll but also returns an array of nodes instead of NodeList type Basically Array from document querySelectorAll div div Much shorter The variable references the result of the last evaluated expression iWith the Console Importer browser extension for Chrome you can quickly import and play with npm libraries right in the console Just run e g i lodash or i moment and after a couple of seconds you have lodash momentjs available	2021-06-01 18:08:07
Apple	AppleInsider - Frontpage News	What to expect from WWDC 2021 - and what not to	https://appleinsider.com/articles/21/06/01/what-to-expect-from-wwdc-2021---and-what-not-to?utm_medium=rss	What to expect from WWDC and what not toIt would be great if Apple released everything that everyone is predicting for WWDC but it never does and is no exception Here s what Apple will absolutely debut what might see the light of day and won t make an appearance WWDC will feature software Guaranteed There are always wild rumors and predictions ahead of any WWDC keynote Since it comes exactly half way through Apple s two year transition to Apple Silicon there is of course an expectation that Apple will talk about that and roll out everything that s missing from the Mac product line Read more	2021-06-01 18:06:14
Apple	AppleInsider - Frontpage News	Apple TV app launches on Nvidia Shield with 4K, Dolby Atmos support	https://appleinsider.com/articles/21/06/01/apple-tv-app-launches-on-nvidia-shield-with-4k-dolby-atmos-support?utm_medium=rss	Apple TV app launches on Nvidia Shield with K Dolby Atmos supportThe Apple TV app and Apple TV are now available on the Android TV based Nvidia Shield streaming device Credit NvidiaStarting June Nvidia Shield owners will be able to stream content via the Apple TV app including the Cupertino tech giant s full slate of originals and other TV shows and films purchased through Apple s platforms Read more	2021-06-01 18:07:25
海外TECH	Engadget	NASA delays the James Webb Space Telescope launch again	https://www.engadget.com/nasa-james-webb-space-telescope-launch-delay-181128125.html?src=rss_b2c	october	2021-06-01 18:11:28
Cisco	Cisco Blog	Introducing continuous remote worker visibility and expanded data collection with Secure Network Analytics Release 7.3.2	https://blogs.cisco.com/security/introducing-continuous-remote-worker-visibility-and-expanded-data-collection-with-secure-network-analytics-release-7-3-2	Introducing continuous remote worker visibility and expanded data collection with Secure Network Analytics Release With Cisco Secure Network Analytics release users can gain complete and continuous remote worker visibility expand data collection capabilities to experience further extended visibility and enhanced context and more	2021-06-01 18:46:14
海外科学	NYT > Science	Editor of JAMA to Step Down Following Racist Incident	https://www.nytimes.com/2021/06/01/health/jama-bauchner-racism.html	journal	2021-06-01 18:13:09
ニュース	BBC News - Home	Covid: Zero daily deaths announced in UK for first time	https://www.bbc.co.uk/news/uk-57320320	indian	2021-06-01 18:07:27
ニュース	BBC News - Home	Covid: Scotland 'at the start' of a third wave	https://www.bbc.co.uk/news/uk-scotland-57323037	clinical	2021-06-01 18:35:24
ニュース	BBC News - Home	'I would have picked more right-backs' - Southgate defends squad selection	https://www.bbc.co.uk/sport/football/57321192	x I would have picked more right backs x Southgate defends squad selectionGareth Southgate says if he could have picked five or six right backs for England s European Championship campaign he would have done	2021-06-01 18:43:45
ビジネス	ダイヤモンド・オンライン - 新着記事	東京五輪、どう対処しても失うもの多い日本 - WSJ PickUp	https://diamond.jp/articles/-/272818	wsjpickup	2021-06-02 03:50:00
ビジネス	ダイヤモンド・オンライン - 新着記事	古河グループ多角化の立役者、中川末吉が振り返る新事業の起こし方 - The Legend Interview不朽	https://diamond.jp/articles/-/272714	古河グループ多角化の立役者、中川末吉が振り返る新事業の起こし方TheLegendInterview不朽三井、三菱、住友、安田の四大財閥に次ぐ規模で、戦後はGHQによって解体対象とされた大財閥に数えれれる古河財閥。	2021-06-02 03:45:00
ビジネス	ダイヤモンド・オンライン - 新着記事	【社説】ネタニヤフ時代終焉も新政権は左傾化せず - WSJ PickUp	https://diamond.jp/articles/-/272819	wsjpickup	2021-06-02 03:40:00
ビジネス	ダイヤモンド・オンライン - 新着記事	中国の3人目出産容認、早分かりQ&A - WSJ PickUp	https://diamond.jp/articles/-/272820	qampampawsjpickup	2021-06-02 03:35:00
ビジネス	ダイヤモンド・オンライン - 新着記事	トーマス・クック破産が象徴する「旅行業界のデジタル化」、新風を吹き込むのは？ - 経営・戦略デザインラボ	https://diamond.jp/articles/-/272361	トーマス・クック破産が象徴する「旅行業界のデジタル化」、新風を吹き込むのは経営・戦略デザインラボ「世界初の旅行代理店」とも言われてきたトーマス・クックが年に破産申請をしたことは、旅行業界に大きな衝撃を与えました。	2021-06-02 03:30:00
ビジネス	ダイヤモンド・オンライン - 新着記事	部下が嫌いな上司の言動14選！ウェブ会議で鼻息「スーハー」、出社させて不在… - ニュース3面鏡	https://diamond.jp/articles/-/271915	部下が嫌いな上司の言動選ウェブ会議で鼻息「スーハー」、出社させて不在…ニュース面鏡新卒として会社に入ってから年目、年目とキャリアによって会社での立場も変化していきます。	2021-06-02 03:25:00
ビジネス	ダイヤモンド・オンライン - 新着記事	「学力の二極化」が止まらない！幼少期の読書が必要なこれだけの理由 - 教育現場は困ってる	https://diamond.jp/articles/-/272307	国語教育	2021-06-02 03:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	ストレスの9割は刷り込み・思い込みで決まる、上手に逃げる力とは - ニュース3面鏡	https://diamond.jp/articles/-/272849	さらに、コロナ禍での生活が長期化する中、以前よりもストレスを強く感じる人が増えているのではないでしょうか。	2021-06-02 03:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	ファーウェイの独自モバイルOS、グーグルの覇権に挑む - WSJ発	https://diamond.jp/articles/-/272910	覇権	2021-06-02 03:13:00
ビジネス	ダイヤモンド・オンライン - 新着記事	【論破王】ひろゆきが語る「大企業」で働くリスク - 1％の努力	https://diamond.jp/articles/-/272717	youtube	2021-06-02 03:05:00