投稿時間:2023-01-07 15:06:33 RSSフィード2023-01-07 15:00 分まとめ(10件)

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Git	Gitタグが付けられた新着投稿 - Qiita	GitlabへのSSH接続がTimeoutする場合の処方箋	https://qiita.com/holmes64/items/0b51fc5c335b52ffffc0	hvvvgitgitlabcomopensshp	2023-01-07 14:58:28
Ruby	Railsタグが付けられた新着投稿 - Qiita	『API』を基本からまとめてみた	https://qiita.com/kanfutrooper/items/5598ad54aaf6ebbe58e4	基本	2023-01-07 14:31:45
海外TECH	DEV Community	Bundling YAMLs for Kubernetes with Helm	https://dev.to/aniket762/bundling-yamls-for-kubernetes-with-helm-4pck	Bundling YAMLs for Kubernetes with HelmThe introduction of microservice architecture revolutionised the way softwares are developed today Post microservice architecture replaced monoliths containers replaced virtual machines With this transformations building application became complex due to multiple containers Container orchestration was a new bottleneck which was solved by Kubernetes In the process containers and Kubernetes brought in many new challenges The most difficult being deploying and managing applications on Kubernetes An array of open source tools are being developed to ease out the process One such tool is Helm History Start of Helm After being in the community for more than a year Kubernetes finally made its first general availability release with version in the summer of Deis a business devoted to supporting the Kubernetes Ecosystem created Helm in its initial iteration Introduced at the inaugural KubeCon In January of the project merged with a GCS tool called Kubernetes Deployment Manager and the project was moved under Kubernetes Since its beginning Helm has been intended to function as a package management tool With Helm V Helm is currently on its fourth iteration With Helm V its third iteration it attracted a lot of adoption due to reduction of security concerns What exactly is Helm If you are a javascript or a python developer you can think Helm to be equivalent to npm or PyPI The concept of package managers are not new if you are a linux users I am pretty sure you have used apt yum for installing and uninstalling softwares With the growth of complex services deploying with only one ks configuration file was not feasible Where to even store these YAMLs became a problem as the amount of YAMLs grew Helm is here to help with these issues Graphics Logz ioSuppose we want to implement Elastic Stack for logging To do it we need to write configmap secret stateful set permissions and more Writing all of these at times becomes pretty tedious and often increases the chance of error So bundling is done These bundles are known as Helm Charts Why is Helm so popular The big benefits to using Helm are pretty similar to CI and CD goals repeatability and consistency Imagine a server used by millions of users having reductant code the amount of cash burn will be insane Moreover bundling reduces the chance of errors Helm also referred as templating engine helps in defining a common blueprint Dynamic values are replaced by place holders which helps in achieving code consistency and POCs Ultimately using Helm saves the development time It takes care of the CI CD pipeline where in we can focus on building what matters With Helm we no longer need to construct individual YAML files for every application in a stack Helm Charts are highly customisable we can just download a Helm Chart and combine it with our YAML file thus no longer we are required to build everything from scratch Helm Developer develops the Helm Charts such that it can be used by everyone Post creating the Chart it is pushed into the repository which is then further used by developers Developers pull the image from the repository using Helm post modifying according to the required value they use it while defining their own clusters Not only software developers or open source initiatives can use Helm packaging Every individual or organisation installing softwares for day to day purpose can use Helm packaging Using a package manager lowers complexity and duplication in coordinating the procedures specified in the package manager as Kubernetes investments continue Helm having the feature of Release Management also power rollback add on incase anything goes wrong What are Helm Charts Helm charts are bundles or collections of Kubernetes YAML files that make up an application The main format that Helm operates is a Chart Helm Charts can be stored in Chart Repositories with ease because they are file based and adhere to a convention based directory structure Charts can be installed and uninstalled into Kubernetes clusters A running instance of a Chart is referred to as a Release just as the relationship between an image and its container A Helm Chart is ultimately an executable template that transforms Chart definitions into Kubernetes manifests Helm Charts when created must have a version number Helm Charts can reference other Charts as dependencies a core to any package manager Moreover there are private and public repositories where in we can store Helm Charts Demystifying Helm Charts ‍ ️Using a single Helm Chart Helm allows us to deploy many configurations for the same application Helm accomplishes this using a template engine In response to input parameters that can be modified in a values yaml file the template engine generates manifest files Application configurations can be created and shared via Helm We can search for Helm Charts on Artifact Hub or using cli via helm search keyword command We can also find Helm Charts on GitHub GitLab BitBucket and related platforms Here is the verified Helm Chart for Nginx Now that we have an idea on where to find Helm Charts let s dive in to Helm Chart s skeleton Breaking down Helm Charts Helm Charts are stored in a modular fashion All particular charts have similar directories Chart yaml Charts templates NOTES txt deployment yaml ingress yaml service yaml values yaml With these pieces out of the way Helm can execute on our Chart To understand Helm Charts we need to understand the basic building blocks ️⃣Chart yaml file This is where we put all the information about the chart we are packaging So for example the version number etc This is where we will put all those details ️⃣Values yaml file This is where we define all the values we want to inject into our templates Values yaml is similar to variable tf in terraform ️⃣Charts This is where we store other charts that our chart depends on We might be calling another chart that our chart need for functioning properly ️⃣Templates directory This directory contains the templates files of the chart and when they combined with values they generate the valid manifest files Walkthrough Let s see how it works To install Helm command use supported package manager or simply download the pre complied binary brew install kubernetes helmInstalling Tiller with the Helm init command to start deploying applications into pure Kubenetes cluster helm initNow Helm can be used particularly in two ways Either modifying post fetching from web or creating from scratch Install Charts from Web For the first way ie to install Helm chart from web we need to do two things Managing remote stable repositories helm repo add bitnami And then installing the chart helm install my nginx bitnami nginx Now if we want to use with custom yaml file and override some of the values we simply need to runhelm install my nginx bitnami nginx f example config yaml Creating Charts locally ‍Using Helm packages is really simple Writing Helm charts is only a little bit more complex Creating a Helm chart involves creating the chart itself configuring the image pull policy and specifying additional details in the values yaml file Initialising with the create chart commandhelm create explore helmPost running the command and checking out the starter directory We can find the chart directory which consists of Chart yaml Charts templates values yaml Post configuring according to requirement we can deploy This way Helm charts simplify application deployment on a Kubernetes cluster Outro Helm is undoubtedly the future of Ks Package Management Helm not just only helps developers who want to install some apps on it but it also helps DevOps engineer they can still create YAML manifest files and use kubectl commands to do deployments Using the templating engine engineers can focus on what really matters Helm takes care of code consistency and redundancy The bundling of YAML files has ultimately reduced the bundle size of the server application and enhanced the CI CD flow Moreover Helm simplifies the DevOps learning curve we do not require a full detailed understanding of the function of each Kubernetes object in order to start developing and deploying container applications Helm easily integrates into CI CD pipelines and allows software engineers to focus on writing code not deploying applications The purpose of this blog is to create awareness about Helm and similar package managers It is further recommended to go through Helm s official Documentation Incase you have some questions regarding the article or want to discuss something under the sun feel free to connect with me on LinkedIn If you run an organisation and want me to write or create video tutorials please do connect with me	2023-01-07 05:11:45
海外ニュース	Japan Times latest articles	Republican McCarthy wins U.S. House leadership bid after unprecedented string of losses	https://www.japantimes.co.jp/news/2023/01/07/world/politics-diplomacy-world/kevin-mccarthy-house-leadership-14th-loss/	Republican McCarthy wins U S House leadership bid after unprecedented string of lossesOn his th try McCarthy finally won after a week of repeated votes that highlighted Republicans divisions and raised questions about their ability to govern	2023-01-07 14:39:04
海外ニュース	Japan Times latest articles	International fusion energy project faces delays, chief says	https://www.japantimes.co.jp/news/2023/01/07/world/science-health-world/international-nuclear-fusion-delay/	International fusion energy project faces delays chief saysA deadline wasn t realistic in the first place even before two major problems surfaced the International Thermonuclear Experimental Reactor head said	2023-01-07 14:18:55
ニュース	BBC News - Home	Heated exchange between Kevin McCarthy and Matt Gaetz annotated	https://www.bbc.co.uk/news/world-us-canada-64195940?at_medium=RSS&at_campaign=KARANGA	kevin	2023-01-07 05:04:55
ニュース	BBC News - Home	What has Kevin McCarthy given up, and at what price?	https://www.bbc.co.uk/news/world-us-canada-64194129?at_medium=RSS&at_campaign=KARANGA	speaker	2023-01-07 05:39:14
ニュース	BBC News - Home	The key claims made in Spare	https://www.bbc.co.uk/news/uk-64179164?at_medium=RSS&at_campaign=KARANGA	camilla	2023-01-07 05:14:54
北海道	北海道新聞	八村は５得点、渡辺３点　米プロバスケＮＢＡ	https://www.hokkaido-np.co.jp/article/784507/	渡辺	2023-01-07 14:33:00
ニュース	Newsweek	毎日ウオッカを1.5リットル...重度の「依存症」だった私が救われた「瞬間」の出来事	https://www.newsweekjapan.jp/stories/world/2023/01/post-100505.php		2023-01-07 14:50:00