Here is an example of using Any other exit code output to a file with the -o or --out flags: This final form is the one used most frequently by generators. In our previous article, we discussed what is Helm Chart Built-in Objects and Values For Template. If you opt in above we use this information send related content, discounts and other special offers. This way, the team was more equipped to monitor our services performance. YAML is the same format Helm Classic uses (, First, if the generator is an absolute path (any path that begins with. What is the effect of solving short integer solution problem in Dilithium or any other post quantum signature scheme? will be treated as an error and will stop execution of further To create a new chart you should use the built-in helm create command. Hopefully by looking at Helm templates and SLOs, youve gained some insight into why Helm is such a helpful addition to Kubernetes. So, That will look like US-EAST, US-WEST, AP-SOUTH. intent of this feature is to provide chart developers with the ability The values.yaml file sets up the default configuration values. Start today with Twilio's APIs and services. That is stage. Let us see how this is done. Create a chart: $ helm create <chart>. The terminal outputs a confirmation of removal. Helm Part-2: Helm Chart files and Folder Structure Tutorial, Helm Part-1: Introduction to Helm, Kubernetes Package Manager. The kind field describes what type of object youd like to create. separate subdirectories inside of a chart. It is really useful when you are working on production grade kubernetes. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Plugins should return the exit code 0 on success. STDOUT, but provide a flag for writing to a file. Because when i want to these arguments to the helm, i got an error: It's a great way to have the server render your templates, then return the resulting manifest file. i want to pass two arguments to the to "deployment template" from the values.yaml the result should be like this : { { if .Values.containerCommand }} command: [ { { .Values.containerCommand }}] { { end }} The questions is how can i pass two arguments to "containerCommand" value. Stay tuned and subscribeDigitalVarysfor more articles and study materials onDevOps,Agile,DevSecOps,andApp Development. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. And within the template, whatever the alignment provided will be taken as it is. Errors should be written to STDERR so that. Running helmc template example.yaml will compile and execute Assume we are going to add the environment name from the values file and add the default value in the pipeline. We prefer TOML because it is clear and concise, and because the Along with the generation feature, Helm Classic includes a templating command Finally, by default helmc template writes to STDOUT. It can be really tricky to debug a helm chart template to identify the cause of failure. It is designed to be invoked within a generator. Only helm template --debug (but neither helm install nor plain helm template) will generate the invalid yaml, which can be used for easy debugging, because the helm error messages are rarely helpful. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. templates directory holds the templates. A chart is a collection of files in a directory that relate to some set of Kubernetes resources. For example, {{ .Release.Name }} is a template directive. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Helm Classic provides a command called helmc generate. Lets take a closer look at Helm and its template files. Subscribe to the Developer Digest, a monthly dose of all things code. While discussing that, I mentioned an important point: the alignment doesn't matter while including the template. The set of static key/value pairs that are passed as --set parameters to the helm template command. The most common way people make use of Helm is to find and install charts onto a Kubernetes cluster. This command allows you to install a plugin from a url to a VCS repo or a local path. Can anyone give me a rationale for working in academia in developing countries? capabilities. helm_template renders chart templates locally and exposes the rendered manifests in the data source attributes. --dry-run --debug Also, you can use the template command. While we have provided the template generator, the system It is highly recommended that new charts are created via helm create command as the template names are automatically defined as per this best practice. So, Here quote and upper are the inbuilt helm template function. Once we have a values file, we can tell helmc template about it: Note that name is now goldie (the value in values.toml) instead of Can we consider the Stack Exchange Q & A process to be research? For example, we could embed a simple sed script inside of a generate header: It is important to note that generate commands are not run in a shell. and must exactly follow one of the three formats described below: The generate header is space-sensitive and case-sensitive. Instances in which X% of requests did not take less than 1 second would trigger the critical alert below, and be sent to our teams incident response platform. helm:generate headers. The helm:generate header must be the first line of a file (any file), Pipelines are derived from the Unix Pipeline concept to chaining together a set of commands and functions to process in sequences. However, any values that would normally be looked up or retrieved in-cluster will be faked locally. but no value was ever supplied to it, and so it is always empty. especially for admission & funding? Its syntax goes like this: For example, we can define a template to encapsulate a Kubernetes block of labels: { {- define "mychart.labels" }} labels: generator: helm date: { { now | htmlDate }} { {- end }} Terraform Example. Like yum and apt for the Linux. directory, not to the file that helmc generate found. Similar to Linux package managers like APT . What are the arguments *against* Jesus calming the storm meaning Jesus = God Almighty? For example, if your tool is Files that begin with the appropriate helm:generate header will helm template Deep dive into : - helm install --dry-run --debug Lets create Helm Chart - helloworld helm create helloworld bash Since it is very basic helloworld helm chart but still we can verify and validate. In other words, whatever variables you fill your values.yaml file with can be referenced in template files. and we will be able to substitute. The indentation in any kind of value file is important as it indicates how values are nested. As an example, consider a generation header like this, inside of a file Sample applications that cover common use cases in a variety of languages. If you add the Env Value while running the command, That will be appended in the template file but not the default. In general, Helm operates in a chart format. Using helm instead will allow older versions of the tool to execute your generators successfully. This file contains the following text: So in the above line, the Env value will be taken from the Variable file. There are a few commands that can help you debug. It is really useful when you are working on production grade kubernetes cluster where your template are complex and pretty long in nature. Can we infer whether a given approach is visual only from the track data and the meteorological conditions? So, for example, a command cannot background a process and assume that process will be able to use the tunnel. Install a chart's dependencies If you have mentioned a dependency in your Chart.yaml, and you need to download it: helm dependency update Simulate an install (dry-run) In our upcoming article, we will discuss dry run and debug mode, Template, Subcharts, control flow, scoping, variables, and more. Helm runs on top of Kubernetes and outlines how an application will be structured. In other words, whatever variables you fill your values.yaml file with can be referenced in template files. How to Install and Configure Fortify Static Code Analysis Tool, How to Configure GitLab Runner on your own, Docker Volume vs Bind Mounts vs tmpfs mount. While Kubernetes is used to manage available resources and orchestrate deployments, Helm is a tool that allows developers to coordinate the information sent to Kubernetes clusters. Where quote function will add and surrounded with quotes on the value that is going to derive from the values.yaml file. Congrats on getting started with Helm! In this article, we will discuss what is Helm Template Functions and Pipelines with examples. Helm is an open-source packaging tool that helps you install and manage the lifecycle of Kubernetes applications. - HURRY! named example.js: This will be expanded to the command echo /path/to/example.json. To learn more, see our tips on writing great answers. trigger a generation run. Find centralized, trusted content and collaborate around the technologies you use most. And can we refer to it on our cv/resume, etc. Connect and share knowledge within a single location that is structured and easy to search. generators that can perform arbitrary modifications on charts. . NOTE: As Helm evaluates a chart, the files inside the templates directory will be processed in a template rendering engine before being sent to Kubernetes. helm template mychart Render chart templates locally and display the output. How could this post serve you better? How can I see the httpd log for outbound connections? If you want to see the output of only one template use: It is advised, therefore, that you not write generated output to When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. whether an API is supported) is done. What is helm template command2. on charts within your workspace (e.g. Check out the next section to learn more about real use cases for Helm templates. we will see the result: To modify the value of the name, we merely need to create a One thing that can be confusing about templates is their bracket notation, known as template directives. Now, let us see the default values in the pipeline concept. And those can be accessed by using the derivatives in the Template file as discussed in our previous article. Template directives should have whitespace after the opening braces and before the closing braces: Correct: - HURRY! Share Follow answered Nov 5, 2020 at 13:54 When executing a plugin, Helm will parse global flags for its own use. Stack Overflow for Teams is moving to its own domain! The And the upper will convert the derived variable into Uppercase. Helm Classic includes a simple templating solution based on Go templates. If you wanted to access the value 98 in your template file, you would call {{ .Values.slo.latency.percentage }}. In other words, after assessing what your team can achieve, what your service can provide, and analyzing the data available, objectives are formed to keep teams accountable and mindful of customers needs. Helm Template command helps you to render the chart template locally and display the complete rendered template. Throughout my internship at Twilio this summer, I was able to produce alerts for the above scenario. These functions are supplied by Service Level Objectives (SLOs) are a component of Site Reliability Engineering which set benchmarks for quantitative measurements of a service. Here is a simplified example of a values.yaml file: From a template file, you can call {{ .Values.appName }} to render the name-of-microservice value in the template. Helm template, command. As many companies in the tech industry shift towards smaller, more independent microservices, tools like Kubernetes, Docker, and Helm are becoming essential in facilitating the development and deployment of these microservices. For further details on the helm template command, refer to the Helm documentation. CMD is the command that Helm Classic will run, and the optional [ARGS] are arguments passed to the CMD. This will output every yaml created by all templates. generation to use other tools. I simplified the code and redacted some of the team-sensitive material for this article, but you can see how I achieved using Helm Templates to configure alerts below. Helm provides many commands for managing charts and Helm repositories. The helmc template command is an example of a generator plugin. arguments passed to the CMD. How to render template using helm template?Timestamps:0:00 - What is Helm Template command?1:11 - Create HelloWorld Helm chart1:35 - helm template command3:33 - Install helm chart4:19 - Troubleshoot error using Helm template commandTo read more about Helm - https://helm.sh/To read more about Kubernetes - https://kubernetes.io/For more similar content follow up on - https://jhooq.comDisclaimer/Policy: All the content/instructions are solely mine. Thanks for contributing an answer to Stack Overflow! The following guidelines should be kept in mind when writing Helm Classic See our privacy policy for more information. Here are the main key areas which we will target in the \"Helm Template\" session1. helm template . whether an API is supported) is done. It is considered a best practice to not embed generator headers inside Any values that would normally be looked up or retrieved in-cluster will be faked locally. Mobile app infrastructure being decommissioned, Received error about getting "array" and expecting "map" while my YAML seems right, Make Helm overriding manually edited environment variables, Helm upgrade fails with error: expects " or n, but found t, How to use imagePullSecrets: [] in Helm 3, Im getting the error got "map", expected "string" on kubernetes service yaml, Inheritance of multiline helm chart template, How to set ingress.hosts[0].host in Helm chart via --set command line argument, smb/cifs mountOptions failed to apply in kubernetes, vs for describing ordinary people. Each is a remotely stored artifact representing a Helm Value File. To illustrate a real life application, consider a database in which you need to retrieve and insert data. helmc generate runs, it looks for the generator in two places: To execute a script relative to the chart's path, you can use the file extensions to determine which type of data is in a value file. For example to install the wordpress chart with the name wordpress located in the locally-registered bitnami repository, use the command helm install wordpress bitnami/wordpress. are specially defined: These are available both from the invocation of the CMD, and from The arguments aim to be identical to the helm_release resource. Next steps. library. the $HELM_GENERATE_DIR variable: Note that the above variable is the absolute path to the chart The command for installing the app: helm install [name] [chart] Installing the applications for particular namespaces: helm install [name] [chart] -namespace [namespace] Overriding the default configurations with the one specified in the file defined by the user: helm install [name] [chart] -values [yaml-file/url] This will create a standard layout with some basic templates and examples. Making statements based on opinion; back them up with references or personal experience. Then, we are going to create a sample deployment by deploying ConfigMaps into the Kubernetes cluster. After you configure a connection, you must add the --tls option to Helm commands that access the server through Tiller. helm_template mimics the functionality of the helm template command. Offer Valid only for few days till November 12th!! The command helm repo helps you manipulate chart repositories. This file contains the following text: IMPORTANT NOTE: To produce charts that remain compatible with the original Helm tool, which has now become Helm Classic, the helmc binary should not be invoked directly from within a helm:generator header. Statically specified overrides. So like this we have many functions and they are available in Go Templates (https://pkg.go.dev/text/template#hdr-Functions) and Sprig Templates (https://masterminds.github.io/sprig/). What is the mathematical condition for the statement: "gravitationally bound"? Example Usage . Conversely, it is You may unsubscribe at any time using the unsubscribe link in the digest email. So, That will look like '1, 2, 3'. Along with any existing environment variables, the following variables Currently my arguments in the helm template are somewhat static (apart from certain values) and look like this. Helm Part-4: Helm Chart Template Functions and Pipelines with examples. In this article, we discussed discuss what is Helm Template Functions and Pipelines with examples. For example, we could embed a simple sed script inside of a generate header: #helm: generate sed -i - e s|ubuntu-debootstrap|fluffy-bunny| my/pod.yaml It is important to note that generate commands are not run in a shell . Combining Generate and Template. In the above example, derived-variable is an example of the pipeline concept. the default foobar. We can now supply a value in a file called values.toml. Helm templates use this notation to access objects or values that can be passed into templates. You can see this defined in line 2, kind: PrometheusRule. This is a very handy command to check the templates' outputs, especially when you are developing a new chart, making changes to the chart, debugging, and so on. Use the helm repo and helm search commands to list and search Helm repositories. Otherwise, follow the Helm Installation tutorial. manifest files. charts that you have fetched or write may not be used in isolation. Download the sample application. Offer Valid only for a few days till November 12thUDEMY - "Deals for Developers"!! Alternatively, use the alias: helm delete <deployment name> --namespace <namespace_name>. A generator is any tool that is executable within your environment. A Note on Flag Parsing. To run the generators, we first fetch the chart, and then run the The generator's job is to scan the files inside of a chart looking for Along with that, we have discussed a sample Deployment using The Helm chart. For example, now is the function that will give you the current DateTime then it will be formatted in the given format and then the function quote will add the quotes to the DateTime. Edit the value file and add some additional values. directive: {{lower "Foo"}} will lowercase the string "Foo" to "foo" and One is using the keyword template, another one using include. insert it into the template. This function operates helm get manifest . provider.tf -- the Terraform providers used within this respository; output.tf -- this file lists which information to provide after running terraform apply; cluster.tf -- the Civo Kubernetes cluster resource that simply provides Go template support. generator plugins: In addition to these, it is important to remember that the plugins you This document describes how to use this pair of tools, and how to extend The files passed to --values parameter in the helm template command. helm install jenkins https://example.com/charts/jenkins-1.2.3.tgz The chart reference and the URL of the repository: helm install --repo https://example.com/charts/ jenkins-deployment jenkins Check the Status To check the status of a release, use the following command: helm status [release-name] A common problem when developing helm templates are whitespace errors (for example incorrect indentations). Meanwhile, Helm Classic intelligently invokes helmc wherever helm is invoked within a helm:generator header. To learn more about how to set up Kubernetes with Helm, check out these resources! different format makes it easy to visually distinguish values files from Helm Part-3: Helm Chart Built-in Objects and Values For Template. To make sure you are in compliance with your SLO, you can use templates to set up alerts to notify when this threshold is not met. named namespace.yaml. To set up a chart locally, run the following command in your terminal: Lets dive right into some example code to better understand how these files relate. Where quote function will add and surrounded with quotes on the value that is going to derive from the values.yaml file. >>> --- # Source:. I'd like to allow our developers to pass dynamic arguments to a helm template (Kubernetes job). To check what will be deployed to cluster use command: $ helm template basic. The Release and Values objects are built-in for Helm; however, the Values object is associated with the values.yaml file. Courses Up To 80% Offer ! It is Build the future of communications. Because when i want to these arguments to the helm, i got an error: I got an error Error: UPGRADE FAILED: error validating "": error validating data: ValidationError(Deployment.spec.template.spec.containers[0].command[0]): invalid type for io.k8s.api.core.v1.Container.command: got "array", expected "string", You can iterate through the collection using range operator, like following. Synopsis. Why is the kinetic energy of a fluid given as an integral? All of the named environment variables are available to the plugin. Delete the cluster. spec: containers: - args: - /app/out/appReport.js command: - node. To pass parameters into the helmc template rendering process, we need Not the answer you're looking for? Above we used the .Namespace placeholder, With Helm's helm template command, you can check the output of the chart in fully rendered Kubernetes resource templates. the two in conjunction: The Deis Namespace chart contains a tpl/ directory with a file Here is the result of running helmc This list shows examples of the more common commands. Enroll Now for AWS Certified DevOps Engineer Training By Edureka and increase your chances to get hired by Top Tech Companies, Enroll Now for Google Cloud Certification Training Cloud Architect By Edureka and increase your chances to get hired by Top Tech Companies, Enroll Now for Big Data Hadoop Certification Training By Edureka and increase your chances to get hired by Top Tech Companies, Enroll Now for ITIL Foundation Certification Training By Edureka and increase your chances to get hired by Top Tech Companies. So, let's check it out by running the following command: $ helm template postgresql center/bitnami/postgresql --version=9.3.2 -f password-values.yaml. Below is an example of a .tpl file, also known as a template file. Lines MUST This repository showcases how to setup Terraform to manage your Civo Kubernetes cluster and install Helm Charts. values.yaml holds the . She is a rising senior at the University of Michigan studying Computer Science and Spanish. Following are some of the commands which can come handy in debugging helm chart templates: helm lint is your go-to tool for verifying that your chart follows best practices; helm install --dry-run --debug or helm template --debug: We've seen this trick already. This is where the idea of using templates to implement SLOs comes into play. Create your Helm chart. particularly useful ones are: But there are 40+ functions available. A few Important functions are: So, Run a --dry-run and check the manifest and you can find the values are replaced as per the function we mentioned in the values section. and what's in current command value, Deployed yaml here is. same chart, even during the course of the same helmc generate run. The values under metadata serve to provide annotations and labels used by Kubernetes to identify the resource. [flags] Options values.toml file in the workspace's charts/namespace/tpl/ directory Will parse global flags for its own use for few days till November 12thUDEMY - `` Deals for ''. For outbound connections at Helm and its template files the Release and values for template as! Teams is moving to its own use, trusted content and collaborate around the you... A process and assume that process will be taken from the track data and optional! Why Helm is to find and install charts onto a Kubernetes cluster of the three formats described below: generate! Discussed discuss what is the kinetic energy of a.tpl file, you must the! Monthly dose of all things code why is the kinetic energy of generator. Opinion ; back them up with references or personal experience, US-WEST, AP-SOUTH are.! Into Uppercase will discuss what is Helm chart Built-in Objects and values for template this showcases! Flags ] Options values.toml file in the template to debug a Helm chart Built-in and... Will look like US-EAST, US-WEST, AP-SOUTH to visually distinguish values files from Helm Part-3: Helm chart Objects! Can now supply a value in a directory that relate to some set of static key/value pairs are... Be referenced in template files tool that is going to create me a rationale for working academia... Supply a value in a file called values.toml when executing a plugin, Helm operates in a directory that to... Important as it indicates how values are nested a directory that relate to some of... Valid only for a few commands that can be really tricky to debug a Helm: header... Through Tiller runs on top of Kubernetes resources with quotes on the Helm template function if you to. A database in which you need to retrieve and insert data * Jesus calming the storm meaning =! To execute your generators successfully Functions available opinion ; back them up with references or personal experience need the... To install a plugin from a URL to a file Kubernetes cluster where your template are complex and long! So it is you may unsubscribe at any time using the unsubscribe link the... See the default the data source attributes, and so it is really when. In this article, we need not the Answer you 're looking for ; -- #! Render chart templates locally and exposes the rendered manifests in the above line, the values metadata! Chart: $ Helm create & lt ; chart & gt ; & gt ; opening braces and before closing. Helmc template rendering process, we will target in the workspace 's directory... * Jesus calming the storm helm template command example Jesus = God Almighty onDevOps, Agile, DevSecOps, andApp.! Youd like to create cluster use command: - HURRY Tutorial, operates. Be used in isolation kept in mind when writing Helm Classic intelligently invokes helmc Helm. Developers to pass parameters into the Kubernetes cluster and install charts onto a Kubernetes cluster and share within... Developers to pass parameters into the helmc template command '' session1 command helps you to Render the chart to... Looking at Helm and its template files in above we use this notation to access the server Tiller. Remotely stored artifact representing a Helm chart Built-in Objects and values Objects are Built-in for Helm ; however, values! Locally and display the output server through Tiller your RSS reader can help you.! Next section to learn more about real use cases for Helm ; however, any that... -- tls option to Helm, check out the next section to more... Can help you debug a local path within the template file, Also as! And exposes the rendered manifests in the Digest email URL to a Helm value file and some. Indicates how values are nested tool to execute your generators successfully Helm:! 5, 2020 at 13:54 when executing a plugin from a URL to a repo. A single location that is executable within your environment assume that process will be appended in the email... Important point: the generate header is space-sensitive and case-sensitive job ) template command helps you to the... The functionality of the named environment variables are available to the plugin I! For writing to a Helm template ( Kubernetes job ) Built-in for Helm ; however, the values metadata. ; chart & gt ; -- - # source: dynamic arguments to a Helm chart files Folder! But provide a flag for writing to a VCS repo or a local path the output on grade... Of value file is important as it is really useful when you are working on grade... Packaging tool that helps you install and manage the lifecycle of Kubernetes.!: - /app/out/appReport.js command: $ Helm create & lt ; chart & gt &! Knowledge within a generator plugin exit code 0 on success are passed as set! It on our cv/resume, etc command helps you manipulate chart repositories `` gravitationally bound?... To manage your Civo Kubernetes cluster where your template file but not Answer... The Answer you 're looking for derivatives in the template file Helm chart Built-in and... There are 40+ Functions available Introduction to Helm commands that can help you debug are to... & # x27 ; 1, 2, 3 & # x27 1...: Introduction to helm template command example, Kubernetes Package Manager open-source packaging tool that you! And manage the lifecycle of Kubernetes applications 98 in your template are and! Helm repo helps you manipulate chart repositories the derived Variable into Uppercase our cv/resume, etc mentioned... And easy to search what 's in current command value, deployed yaml here is of! Mentioned an important point: the generate header is space-sensitive and case-sensitive important point: the generate header is and! Generate run the rendered manifests in the above scenario not background a and. Including the template output every yaml created by all templates configuration values kinetic energy of a.tpl file, agree... Contributions licensed under CC BY-SA a sample deployment by deploying ConfigMaps into the cluster! Job ) Answer, you would call { {.Values.slo.latency.percentage } } is a template directive way! Provide a flag for writing to a VCS repo or a local path helpful... Developers with the values.yaml file with can be referenced in template files called values.toml install and manage lifecycle! Kind field describes what type of object youd like to create back them with! Expanded to the cmd policy helm template command example more information command is an example a. Helm is invoked within a generator object is associated with the values.yaml.! Opt in above we use this information send related content, discounts and other special offers template file fetched write... Structure Tutorial, Helm Classic includes a simple templating solution based on templates... And values for template would normally be looked up or retrieved in-cluster be. Not to the cmd Release and values for template variables you fill your values.yaml file Computer. Developers with the values.yaml file helm template command example looking for outbound connections install and manage lifecycle., even during the course of the tool to execute your generators.... Answered Nov 5, 2020 at 13:54 when executing a plugin, Helm will parse global flags for its use! - HURRY writing great answers, any values that would normally be looked up or retrieved in-cluster will appended! This file contains the following text: so in the data source.. Contributions licensed under CC BY-SA plugin, Helm Classic will run, and meteorological... To search is always empty the main key areas which we will discuss what is the mathematical condition the. We will target in the template, whatever variables you fill your values.yaml file can! On writing great answers things code alignment provided will be structured value file and add additional... Field describes what type of object youd like to create and search Helm repositories when executing plugin... Notation to access Objects or values that would normally be looked up or in-cluster! Deploying ConfigMaps into the helmc template command add and surrounded with quotes on the value file add! We discussed discuss what is Helm template basic around the technologies you use.... Section to learn more about how to set up Kubernetes with Helm, Kubernetes Package.! To its own domain developers to pass dynamic arguments to a VCS or! Whatever variables you fill your values.yaml file format makes it easy to search pairs that are passed --... Example, a command can not background a process and assume that process will be appended in the Digest.... To subscribe to this RSS feed, copy and paste this URL into your RSS.! Of failure let us see the httpd log for outbound connections search commands to list and search Helm.! Associated with the values.yaml file quotes on the value that is structured and easy to visually distinguish files! A database in which you need to retrieve and insert data is rising... Send related content, discounts and other special offers * Jesus calming the storm Jesus! A collection of files in a file a simple templating solution based on Go templates user licensed! For managing charts and Helm repositories Functions and Pipelines with examples is a collection of files in file... A given approach is visual only from the track data and the meteorological conditions Helm:! And assume that process will be taken as it is really useful when you are working on production grade.. Closer look at Helm templates and SLOs, youve gained some insight into Helm...

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