. Well occasionally send you account related emails. So they add our chart to the requirements.yaml of a new chart they create, along with a bunch of other charts. to your account. If youre worrying about some of the above questions when developing your first helm charts, try to park the more difficult worries to begin with. So this approach makes it possible for users to not just set their own configuration paramters but also load their own files and run their own custom scripts using those files. }}servicePort: {{ .Values.rabbitmq.managerPort }}. BAD: {{ template "cool-thing" }} {{- toYaml Values.jobs.update-es.resources | nindent 12 }} = error. Does anybody know how I can do this in helm? jamesla commented on Mar 25, 2020. jamesla changed the title Issue with looping through an array and retrieving the key and value for each iteration Issue with looping through an array of maps in helm on Mar 25, 2020. jdolitsky added the question/support label on Mar 25, 2020. If the value is a map and the keys are of basic type with a defined order ("comparable"), the elements will be visited in sorted key order. Always pass the root scope and work from an absolute path. to your account. | b64enc }}'{{ end }}. The xray chart, for example, includes within it the option to deploy a postgres database. Error: render error in "tpl-bug/templates/configmap.yaml": template: tpl-bug/templates/configmap.yaml:5:17: executing "tpl-bug/templates/configmap.yaml" at : error calling tpl: Cannot retrieve Template.Basepath from values inside tpl function: {{ .name }} (BasePath is not a value), I have developed a minimal chart that reproduces the issue: tpl-bug.zip. Send feedback to sig-testing, kubernetes/test-infra and/or fejta. to your account. A common case where a mutually-deployed resource needs to be referred to is a database secret. But the templating gives us a hard time if we try to put dashes in values.yaml to mirror the chart names, ifwe try to use those dashes values like this : Reading post above, it looks like that if I still want to use dashes this way, I need to use index : In addition to that, keys in values.yaml should be CamelCased (https://helm.sh/docs/chart_best_practices/values/). By clicking Sign up for GitHub, you agree to our terms of service and Another chart developer might like our app and decide they want to include it inside a package they want to release. I think it would be nice if Helm will pass values from parent chart to subchart-name using camelcase-ify name instead, e.g. Replacing . The sonarqube chart applies a similar approach directly to environment variables, defining some explicitly and allowing further variables to be set using an extraEnv collection: {{- range $key, $value := .Values.extraEnv }} name: {{ $key }}value: {{ $value }}{{- end }}. {{ range .Values.list }} Because this work-around is relatively easy, there are currently no plans to support using dashes in key names without index in helm. By clicking Sign up for GitHub, you agree to our terms of service and This could be a big advantage in cases where were including the chart inside a parent chart that were developing and we need to refer to a service that is part of the same parent chart. : localRecords:- name: "fake3.host.net"ip: "10.12.10.10"- name: "fake4.host.net"ip: "10.13.10.10". I'm currently experiencing the problem accessing values for such subchart. Dashes are valid as JSON keys, so are valid YAML keys, so the assumption from a user perspective is that there is no reason for them not to work as keys in helm templates. helm search key-value store helm search [keyword] [flags] Options So the values.yaml is the main interface between us as chart developers and our users. $ | indent 12 }}{{- end }}. /remove-lifecycle stale, I also face this issue when trying to use .Chart.Name and .Release.Version inside a range loop. However, we might, sometimes, want to extend this capability to the configuration file: the Helm's "values file" as well. From $27 per night. privacy statement. Helm's toYaml, toJson set of functions). @technosophos Should we change one of these to match the other? So when writing a helm chart we naturally face questions like: We can learn a lot on how to deal with these kinds of problems from the charts in the official helm charts repository. Rotten issues close after an additional 30d of inactivity. https://github.com/kierenj/helm-template-issue-repro, [stable/redmine] Unable to specify TLS configuration. | b64enc | quote }}. Example of generating multiple resources from a single template file. Principal Data Consultant at ThoughtWorks. Sign in Quality Weekly Reads About Technology Infiltrating Everything, The Art of the Helm Chart: Patterns from the Official Kubernetes Charts. The user can inject whatever shell script content they like into.Values.keycloak.preStartScript in their values.yaml. The review guidelines suggest supporting this with toYaml: {{- with .Values.ingress.annotations }}annotations:{{ toYaml . If this issue is safe to close now please do so with /close. 5. I have tried to implement this behaviour as follows: Helm is not able to render the template and I get the following error: Use checksums to track config template/value changes. text/template appears to say that it should work with any structure, so I would assume yes. To eliminate these unwanted values, simply set them to null. Mark the issue as fresh with /remove-lifecycle stale. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. I am pretty new to Helm and not really sure this is indeed an issue or an intended behaviour since I haven't managed to find enough documentation about the tpl function. The issue here is the range function: when inside a range function, the scope of dot (.) And then they distribute it to users who do helm install with that chart. Client: &version.Version{SemVer:"v2.6.2", GitCommit:"be3ae4ea91b2960be98c07e8f73754e67e87963c", GitTreeState:"clean"} Then there isnt even a finite set of configuration option names to expose. { {- range $key, $val := .Values.env.normal }} - name: { { $key }} value: { { $val | quote }} { {- end}} { {- end }} Now let's see what's happening in the code above. So lets try to get a snapshot of patterns from the official charts. To see why, lets start with a picture of what happens when a user runs a`helm install`. Already on GitHub? If you need to delete a key from the default values, you may override the value of the key to be null, in which case Helm will remove the key from the overridden values merge. So that variables would be set in a values.yaml like: Many of the official charts define an extraEnv but in slightly different ways. | quote }}. Have a question about this project? So, let's say I have 2 dependent charts: gitlab and gitlab-runner. A better option is to avoid using an array and replace it with a map: label: foo: name: foo value: foo1 bar: name: bar value: bar2. Just to confirm, as per my minimal repro here - https://github.com/kierenj/helm-template-issue-repro - that this is a bug. Helm charts package up applications for installation on Kubernetes Clusters. For example. Issues go stale after 90d of inactivity. Show more. This allows the user of the chart to set annotations in the values.yaml such as: annotations:kubernetes.io/ingress.class: nginxnginx.ingress.kubernetes.io/rewrite-target: /. thanks for your response. But what will our users be able to do if weve overlooked one? If the value of the pipeline is empty, no output is generated; otherwise, dot is set to the value of the pipeline and T1 is executed. The text was updated successfully, but these errors were encountered: At runtime, the rendering engine needs to know the path of the original template as well as the name of the template, both of which cannot be inferred ahead of time. Hotel Alex. This needs to be configurable as users might not want to use ingress. If the checksum of this file is then used elsewhere (ie by a deployment) when config template/values changes. In other words, your call to tpl is the equivalent of I am not sure where such an explanation, if accurate, should go though. }}. Just for reference here in case you are landing to this issue, the documented way is working . I assigned the issue to myself to go change the convention. Ultimately the Go template parser doesn't support it and there's not much we can do about that without forking it. The disadvantages are that its a bit more abstract and that the content in the values.yaml is treated as a string there so formatting issues arent necessarily found by your editor. As it appears, neither of the two approaches from above seem to work in helmfile/environment scope. fix(helm): Add missing extraConfigs template volume mapping and fix type error on template. If you want to pass in variables to a function, use the template directive instead as others have demonstrated in this thread. If you can determine another way to find out which template is calling tpl, we'd happily accept a PR. Stale issues rot after 30d of inactivity. How can i access servicename value from: ? golang/go#23710 (comment) mentions two solutions - discouraging use of dashes (the current approach) or "rewriting the [helm] template pipelines to use the index function automatically". Looking at the code, that seems like the intended behaviour. Installing a helm chart is a bit like running an install wizard. Send feedback to sig-testing, kubernetes/test-infra and/or fejta. Running it will produce: toppings: |- 0: mushrooms 1: cheese 2: peppers 3: onions For data structures that have both a key and a value, we can use range to get both. Beautiful garden with cute cats :) really ok for the price. So this means that instead of setting extraEnv entries in the values.yaml as simple pairs we would also need to name each of the keys (name) and values (value) in the pairs like: extraEnv: name: ENV_VAR1value: "var1" name: ENV_VAR2value: "var2". And we should probably change the convention. The current section in the chart best practices section is a little misleading. It is not a best practice as such to not use them, it actually requires workarounds to use them. Helm releases usually have multiple revisions. Based on the docs, there is a convention to name charts with dashes. Located in Galai, FLY - Regim Hotelier Galati provides accommodation with free WiFi and free private parking. Then it might be necessary to allow the user to include our chart inside a parent chart alongside a database of their choosing. Use the helm template to read all secrets in the values file and add it to pod environment variables. value (like .Template), the rendering fails. In that case its likely that the user will instead override the path (so that rabbitmq is exposed on a unique route, distinct from other exposed services): - path: {{ default "/" .path }}backend:serviceName: {{ template "rabbitmq.fullname" . This does not work at all in templates, this example code: To get values from a previous revision of a Helm release, use: helm get values <release name> --revision <release number>. $.Chart.name) to access the top level variables. For example, the keycloak chart needs to allow a user to package the keycloak chart inside a parent chart that also supplies a user-defined a json file that the user needs to be able to mount into keycloak Pods. Hopefully the explanation in this post can help encourage others to dive into the official repo and take inspiration from its charts. For me having clarity on the situation is a great first step. {{ index .Values "first-key" "secondkey" }} works in NOTES.txt but in _helpers.tpl when issuing an upgrade command: | indent 4 }}{{- end }}. What if my application parses configuration dynamically so that I cant say upfront what all the possible parameter names will be? For the last example, I get the same error. range. Actually a side-bar explanation in the intro docs saying something like: Because helm uses the go templating language, you are not able to use dashes - in keys directly in the templates using the normal reference mechanism {{ .Values.mybasekey.my-key }} (this is NOT valid). The issue here is the range function: when inside a range function, the scope of dot (.) The rabbitmq chart just offers a single host.). The output of kubectl describe pod ignorant-camel-mysql-5dc6b947b-lf6p8 tells me that my chosen imageTag has been applied. What we expose in the values.yaml determines what users can and cant do with our charts. The only way I can see of providing more direct access would be to remove dashes in keys, but as you mentioned it is valid YAML/JSON and that would likely be even more confusing. Helm generates a unique release name for me (`ignorant-camel`) and mysql is deployed in my cluster. Mark the issue as fresh with /remove-lifecycle stale. Typically resources deployed through helm are prefixed with a release name, so that multiple releases can be installed from the same chart (and in the same namespace) without naming conflicts between the installed resources. The text was updated successfully, but these errors were encountered: Issue with looping through an array of maps in helm. Subchart names will also be keys in templates, so if you use a subchart with a dash in the name and want to override a value, you will need to provide an alias for the chart name or use the work-around mentioned here ({{ index .Values "my-chart" "name" }}). You signed in with another tab or window. Example pipelines to use as conditions. I'm sure I am just missing something simple. Inside the configmap it has entries such as: {{- range .Values.localRecords }}local-data: "{{ .name }} A {{ .ip }}"local-data-ptr: "{{ .ip }} {{ .name }}"{{- end }}. The value of the pipeline must be an array, slice, map, or channel. What does allow template directives to be used inside a file is to load the file content with.Files.Get and pass that into [tpl](https://stackoverflow.com/questions/47595295/how-do-i-load-multiple-templated-config-files-into-a-helm-chart/52009992#52009992). What exactly are you trying to do? Sign in I'am trying to understand how index works. One solution is to use an alias in the requirements.yaml so that your subchart name is changed to something without the -, but this is indeed a pain. tpl function fails when called within a named template that uses a dict. Here is the part of our values.yaml file. $ | indent 8 }}{{- end }}, {{- with .Values.keycloak.extraVolumeMounts }}{{ tpl . Can't refer to aliased subcharts by alias names in master chart, proposal: text/template: support "-" in value maps without "index", ft: ZENKO-310 Update Kafka and Zookeeper Dependencies, Nested loops over keys (with unknown names) and their lists, https://helm.sh/docs/chart_best_practices/conventions/, https://helm.sh/docs/chart_best_practices/values/, Error when accesing values with dash in subchart name (i.e. @spearsem I think the above comment has got the right workaround for that problem. The rabbitmq chart also allows for the host to be not set (the else condition above). The 'version' field should contain a semantic version or version range. Hackernoon Contributor of the Year - Engineering. The use of extraEnv in the keycloak chart suggests a possible pattern for dealing with other kinds of definitions that might need to be injected into a chart. As the helm charts developer guide says, we could create a configmap with a range function. If you have a template and you see Error: UPGRADE FAILED: render error in "MY_APP/templates/deployment.yaml": template: MY_APP/templates/deployment.yaml:29:25: executing "MY_APP/templates/deployment.yaml" at <.Chart.name>: can't evaluate field Chart in type interface {} something to that effect; you need to add a dot to your template call. Lets take a look at some of the patterns that those charts use, so that we can understand how to use the same patterns in our own charts. When the user runs helm install stable/mysql with parameters or a values file, then the parameters or values file will be overlaid on the one in the chart. To load a set of files into a secret we could use [Glob](https://github.com/helm/helm/blob/master/docs/chart_template_guide/accessing_files.md#glob-patterns) to find the files and [Get](https://github.com/helm/helm/blob/master/docs/chart_template_guide/accessing_files.md#glob-patterns) to load them: {{ range $path, $bytes := .Files.Glob "files/*" }}{{ base $path }}: '{{ tpl ($root.Files.Get $path) . What is the Difference Between Front-End, Back-End, and Full-Stack Development? Then the user could then set our charts extraEnv to point to postgres even if weve not defined it explicitly in our original chart. For anyone who stumbles upon this issues, one solution is to pass the Template object into the tpl function alongside your other values via dict. is limited to the scope of the range. Client: &version.Version{SemVer:"v2.14.1", GitCommit:"5270352a09c7e8b6e8c9593002a73535276507c0", GitTreeState:"clean"} Server: &version.Version{SemVer:"v2.14.1", GitCommit:"5270352a09c7e8b6e8c9593002a73535276507c0", GitTreeState:"clean"}, Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5", GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean", BuildDate:"2019-03-25T15:19:22Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}, Cloud Provider/Platform (AKS, GKE, Minikube etc. By clicking Sign up for GitHub, you agree to our terms of service and Stale issues rot after an additional 30d of inactivity and eventually close. Description. If you really want to use dashes in your keys, you can work around this restriction by using the index function, like so {{ index .Values.mybasekey "my-key" ]}. The values.yaml would then have an entry like: extraEnv: |- name: POSTGRES_USERvalue: {{ .Values.postgresql.postgresUser }} name: POSTGRESS_PASSWORDvalueFrom:secretKeyRef:name: {{ .Release.Name }}-postgresqlkey: postgres-password name: POSTGRESS_DBvalue: {{ .Values.postgresql.postgresDatabase }}. How would you use dash names in a control structure, such as a with or range block? While working around this is obviously possible, it just seems a little childish from the go authors and worth fixing for helm. Instead of just one file can with load a set of files into a ConfigMap using.Files.Glob: {{ (tpl (.Files.Glob "files/*").AsConfig . ) @JParkinson1991 thank you very much for your answer. range is as similar to for/foreach loops in any other programming language. I am not familiar with the implementation of with to know if it can utilize the result of another function evaluation as "the context". In the previous section we looked at the built-in objects that Helm templates offer.

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