For example, the stable Drupal chart allows . Its also especially important that the user has flexibility to set the annotations on an ingress resource, since these are used to control routing configuration options. This object provides access to values passed into the chart. And its values.yaml lets the entries in localRecords be set as a list e.g. I'am trying to understand how index works. To eliminate these unwanted values, simply set them to null. This is interesting as it allows values to be set like: extraEnv: | name: KEYCLOAK_LOGLEVELvalue: DEBUG name: HOSTNAMEvalue: {{ .Release.Name }}-keycloak. So the values.yaml is the main interface between us as chart developers and our users. The pattern can be especially powerful when combined with the keycloak charts exposing of other parameters, such as a preStartScript variable that is used within the charts initialization script: {{- with .Values.keycloak.preStartScript }} echo 'Running custom pre-start script'{{ . unfortunately doesn't work, I tried even defining a variable in the very first line and try to use it but works just for simple string but not variables. So the user can set whatever annotations they need to on the ingress through the values.yaml without the chart needing to be aware of what those annotations might be. Mark the issue as fresh with /remove-lifecycle stale. I could have run helm install stabe/mysql --values=mysqlvalues.yaml --dry-run --debug and helm would have simply shown me the content of kubernetes deployment descriptor yaml it generated without installing anything. it might read ENV_VAR1 and create an internal variable called var1 )? This can hamper chart readability and put more burden on chart users. In the above example, values found at default.data in the subchart1's values will be imported to the myimports key in the parent chart's values as detailed below: # parent's values.yaml file myimports: myint: 0 mybool: false mystring: "helm rocks!" # subchart1's values.yaml file default: data: myint: 999 mybool: true So the rabbitmq chart, like many others, wraps its whole Ingress resource definition with: {{- if .Values.ingress.enabled }}{{-end}. Here the xray chart knows which database it needs to connect to since it is itself including the postgres chart. | indent 4 }}{{- end }}. What we expose in the values.yaml determines what users can and cant do with our charts. Well occasionally send you account related emails. Syntax werf helm secret values encrypt [FILE_PATH] [options] Examples # Encrypt and save result in file $ werf helm secret values encrypt test.yaml -o .helm/secret-values.yaml Environments 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" If youre interested in contributing, feel free to take a look! Avoid relative pathing, as there is some level of cognitive load when debugging passed scopes in large code bases. {{ include "config-map-name" . Thanks everyone! 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. 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 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. The keycloak chart does this differently again: {{- with .Values.keycloak.extraEnv }}{{ tpl . BAD: {{ template "cool-thing" }} hasKey .Values.mymap "mykey" # Check hash for key gt .Values.replicaCount 2.0 # replicaCount > 2.0 lt .Values.replicaCount 5.0 # replicaCount < 5.0 eq .Values.replicaCount 1.0 # replicaCount exactly 1.0. Found solution: {{ index .Values "mysub-chart" "servicename" }}. 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 }}. 5. Then the data section of the configmap would have entries like: conf_file1: {{ tpl (.Files.Get "files/conf_file1") . to your account. fix: Adding missing secretName in ingress configuration. 4. What configurations need to be made available to the user and how should they be offered to the user? when conventions & best practices are violated. /lifecycle rotten helm search key-value store helm search [keyword] [flags] Options For example, with an nginx ingress a user can apply rules to set headers in custom ways through configuration snippets: annotations:kubernetes.io/ingress.class: nginxnginx.ingress.kubernetes.io/rewrite-target: /nginx.ingress.kubernetes.io/configuration-snippet: |more_set_headers 'Access-Control-Allow-Origin: $http_origin'; This guy is just chillin because his charts are sogood. The rabbitmq chart also allows for the host to be not set (the else condition above). Instead it takes the values.yaml section and simply puts it in the template: {{- if .Values.extraEnv }}{{ toYaml .Values.extraEnv | indent 12 }}{{- end }}. I think the reasons given (that specifically talk about the helm usecase) are perfectly valid but the go authors really don't care. thanks for your response. privacy statement. Any template helper we add would act like a function in the same way index does (e.g. and with @JParkinson1991 approach I get the error: Do I miss something, or is this indeed not supported? where releases are defined, right? The review guidelines suggest supporting this with toYaml: {{- with .Values.ingress.annotations }}annotations:{{ toYaml . I have tried to implement this behaviour as follows: Helm is not able to render the template and I get the following error: So I create my own values.yaml file called mysql-values.yaml with just one line: And then I run helm install stable/mysql --values=mysqlvalues.yaml. But at the same time based on this doc, you should never have values with dashes. Stale issues rot after an additional 30d of inactivity and eventually close. this is a real inconsistency and I have the problem too. For example, we can loop through .Values.favorite like this: range is as similar to for/foreach loops in any other programming language. Located 5 mi from Galati and 9.3 mi from Brila, Villa Siret offers a garden with a seasonal outdoor swimming pool and a children's playground. This article introduces a tpl function-based solution and its more generic "named template" implementation. @prydonius , I really hadn't started to think about it on an implementation level. I have this helm template for secret object: . If/when they fix it, we will get support for it. I was looking through older documentation and this has been a precedent we set since the beginning. 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. Effectively the in-chart values file sets defaults that can be overridden. I think it would be nice if Helm will pass values from parent chart to subchart-name using camelcase-ify name instead, e.g. Sign in The Helm Chart guidelines states that chart must be named with dashes (https://helm.sh/docs/chart_best_practices/conventions/) A values file supplied by helm install -f or helm upgrade -f The values passed to a --set or --set-string flag on helm install or helm upgrade When designing the structure of your values, keep in mind that users of your chart may want to override them via either the -f flag or with the --set option. This has just been a look at a particular slice of the official charts. The syntax is very similar to the other languages where I will be providing the values of collection to the range. works in NOTES.txt but in _helpers.tpl when issuing an upgrade command: 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. Helm generates a unique release name for me (`ignorant-camel`) and mysql is deployed in my cluster. By clicking Sign up for GitHub, you agree to our terms of service and | indent 2 }}. It is not a best practice as such to not use them, it actually requires workarounds to use them. Neither {{ .Values.env }}. privacy statement. Sign in The issue here is the range function: when inside a range function, the scope of dot (.) Example of generating multiple resources from a single template file. Then we can move on to see how some of the official Kubernetes charts deal with these questions. If yes how could I achieve the same result anyway? Is the application meant to be able to interact with other applications? 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. 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. This structure can be anything and the Values key is not necessarily required. in a variable. A microwave, a fridge and . If this issue is safe to close now please do so with /close. Well occasionally send you account related emails. helm lint checks your charts for possible issues, emitting errors for issues which will make installing the chart fail, and warnings for less critical issues, e.g. 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) . This means that template directives need to be used to prefix the resource names when one resource with a chart needs to refer to another, or to resources within the same parent chart. Hotel in Galai. {{ $.Files.Get (print .Template.BasePath "config/nginx/server.conf") | sha256sum | quote }}, {{ .Values.sites | toString | sha256sum | quote }}, {{- range $siteName, $siteConfig := .Values.sites }}, {{- tpl ($.Files.Get "config/nginx/server.conf") (dict "Values" $siteConfig "Template" $.Template) | nindent 8 }}. Though we cant quite apply the same approach with AsSecret as then the content would be encoded before going through tpl. then override the icon in one of two ways: Embed an image directly in a configuration file: This example creates a Base64-encoded and the supported strategies are: Strategies can 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 }}. firstly we defined a. Accessing values of the subchart with dash in the name, AlfrescoArchive/alfresco-dbp-deployment#30. Actually I didnt need to install anything in my cluster to see that my selection for imageTag would be applied. subchartName. I have simplified a lot my real scenario, in my real case the string "{{ .name }}" comes from an external resource. Because the tpl function relies on objects that are in the root scope of the dot (.) I am trying to use the tpl function in a range over a list of objects like the following one: I want that for each object a string like {{ .name }} is evaluated giving as result "Ciao" at the first iteration and "Mondo" at the second iteration. Removing a default key There are many cases in which default values just don't fit a deployment. The text was updated successfully, but these errors were encountered: @idirouhab So because you are in a range block, . no longer refers to the top level scope. Principal Data Consultant at ThoughtWorks. this files checksum changes which would cause the consumer to update itself to take in these changes. . Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Lets say weve defined a Deployment resource in our template and weve configured the env section to allow some environment variables to be set from the values.yaml: - name**:** ENV_VAR1value: {{ .Values.var1 }}- name**:** ENV_VAR2value: {{ .Values.var2 }}. This snippet would not allow your users to reference other values in their values file. privacy statement. The text was updated successfully, but these errors were encountered: This is a good question. i am not sure how to proceed. 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" . @spearsem I think the above comment has got the right workaround for that problem. as long as you are using template as mentioned by @bacongobbler : @fredleger this is the right answer. This is in line with the review guidelines for the official charts repo, which recommends that ingress should be disabled by default. is limited to the scope of the range. @prydonius Do you remember the reason why we initially decided that charts should be named with dashes? If you want to pass in variables to a function, use the template directive instead as others have demonstrated in this thread. It appears that some (many?) I am not familiar with the implementation of with to know if it can utilize the result of another function evaluation as "the context". Apply the variables to the Helm chart by combining them with the helm install command: helm install --set username=$USERNAME [chart name] [chart path] Where: [chart name] is the name of the Helm chart you are using. Already on GitHub? Because the templates are go templates, this assumption doesn't hold. Just exposing these annotations can amount to giving the power to apply script-like configuration on the ingress routing. I seem to be running into the same issue here and cannot figure out how to apply @Zebradil workaround We can use range to iterate through a collection one by one. 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. Our charts and our values.yaml files also need to satisfy another kind of scenario. When installing Helm charts with the helm install command, the --set argument allows you to define values used in a chart's templates.. Helm charts package up applications for installation on Kubernetes Clusters. For the last example, I get the same error. Hotel Alex. Server: &version.Version{SemVer:"v2.6.2", GitCommit:"be3ae4ea91b2960be98c07e8f73754e67e87963c", GitTreeState:"clean"}, kubectl is : So lets try to get a snapshot of patterns from the official charts. @sjentzsch Do you have a snippet to show? Rotten issues close after an additional 30d of inactivity. Have a question about this project? As the helm charts developer guide says, we could create a configmap with a range function. How would you use dash names in a control structure, such as a with or range block? :-), I would add that anyone who wants to look at this should consider writing a HIP - see https://github.com/helm/community/blob/master/hips/hip-0001.md. Set the environment variables to your desired values. Use the index template function to access a value with a '-' in the name: {{ index .Values "gitlab-runner" }}. https://github.com/kierenj/helm-template-issue-repro, [stable/redmine] Unable to specify TLS configuration. Like every other language, the go template language also provides looping using range keyword. 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). You signed in with another tab or window. We have the following: If everyone thinks that's pretty accurate and fair, I will stop bothering everyone! Already on GitHub? The user can then point to their secret (which contains the json file) and mount it through the values.yaml: extraVolumes: | name: custom-secretsecret:secretName: custom-secretextraVolumeMounts: |, name: custom-secretmountPath: "/realm/"readOnly: true. And then they distribute it to users who do helm install with that chart. Seeing how to satisfy our consumers in this food chain is one of the key challenges of writing helm charts. Does anybody know how I can do this in helm? To get values from a previous revision of a Helm release, use: helm get values <release name> --revision <release number>. Have a question about this project? Looking at the code, that seems like the intended behaviour. i see the indent is correct. Well occasionally send you account related emails. This needs to be configurable as users might not want to use ingress. Now users of our chart can override these values in their values.yaml or with set var1=foo. One option would be the extraEnv approach we saw already with the keycloak chart. For me having clarity on the situation is a great first step. with $ as you pointed out should allow the tpl function to work. Or even worse, what if our application can dynamically parse configuration options (e.g. I believe you should be able to use $ (e.g. Mark the issue as fresh with /remove-lifecycle rotten. This wont be comprehensive and I expect new options to become available and new patterns to emerge when helm 3 adds scripting with Lua. Installing a helm chart is a bit like running an install wizard. 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". A typical way of loading a whole file into a configmap is to use.Files.Get. 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. /lifecycle stale. to your account, I am trying to loop through a secrets and add them dynamically using helm templates. If you can determine another way to find out which template is calling tpl, we'd happily accept a PR. If you would like a change, you should file it upstream in the Go project: https://github.com/golang/go. Stale issues rot after an additional 30d of inactivity and eventually close. A nice example of this is in the stable/unbound chart. This pattern gives chart users a lot of power and flexibility, especially for other chart developers using our chart. Helm improvements proposal. Many of the public charts do define an Ingress resource. I assigned the issue to myself to go change the convention. 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" }}). 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". Another chart developer might like our app and decide they want to include it inside a package they want to release. I haven't had a problem doing this, but it is an inconsistency. How can I allow users to use resources defined not directly in my chart but in a chart in which my chart is used as a subchart? Principal Data Consultant at ThoughtWorks. The 'repository' URL should point to a Chart Repository. I spend some time to find a workaround for this, so, this might be useful for someone: Inside the nested template the global context of the parent template is accessible as usual through dot, the range variables are accessible like .key, .value. Is there any workaround for setting vars in cli? I am thinking that maybe it's not such a good idea to change it. I don't think that keys naming should affect Helm templating. By clicking Sign up for GitHub, you agree to our terms of service and Use checksums to track config template/value changes. @bacongobbler Does this also work for with? 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. Already on GitHub? | nindent 8 }}. 1. But it will give us look at the current state of the art. +1 I agree we need to say this in the documentation somewhere, at the very least. | quote }}. To see why, lets start with a picture of what happens when a user runs a`helm install`. 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. This will assign the integer index (starting from zero) to $index and the value to $topping. helm install stable/nginx-controller --set ingress.hosts=null Required parameters You can then add advanced options later. The chart also applies this pattern to allow users to inject further resources into the template such as initContainers and even adding entire additional containers (or sidecars). @kierenj dot variables are not accessible through define functions, hence why it won't work. Accommodation is fitted with air conditioning and features a flat-screen TV with satellite channels, a fully equipped kitchenette with a dining area, and a private bathroom with slippers. In the previous section we looked at the built-in objects that Helm templates offer. Server Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.4", GitCommit:"9befc2b8928a9426501d3bf62f72849d5cbcd5a3", GitTreeState:"clean", BuildDate:"2017-11-20T05:17:43Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}, @svidrascu , check that you have the values defined in the Chart.yaml file for that specific subchart. Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.2", GitCommit:"5fa2db2bd46ac79e5e00a4e6ed24191080aa463b", GitTreeState:"clean", BuildDate:"2018-01-18T10:09:24Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"darwin/amd64"} 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. Nice place to stay for 1 night. The chart supports this by exposing an extraVolumes: {{- with .Values.keycloak.extraVolumes }}{{ tpl . Mark the issue as fresh with /remove-lifecycle stale. It looks like the templating engine can't find your variable. Because this work-around is relatively easy, there are currently no plans to support using dashes in key names without index in helm. I'm currently experiencing the problem accessing values for such subchart. data: { {- range $key, $val := fromYaml .Values.secretmap }} { {- $type := printf "%T" $val }} { { $key }}: { { if eq $type "float64"}}{ { printf "%.0f" $val | b64enc | quote }}{ { else }}{ { $val | b64enc | quote }}{ { end }} { {- end }} kind: Secret . I guess one approach could be to go through and convert values to camel-case, then go through the templates and do the same. A good helm chart needs to anticipate what level of flexibility is needed by its users. If they tried, the result of "helm install" or "helm template" would look like this: spec: containers: - name: main image: myregistry.io/ { { .Values.environment }}/myImage:1.0 env: - name: ENVIRONMENT value: ' { { .Values.environment }}'. Description. In other words, your call to tpl is the equivalent of. I think this should work: Otherwise I think you can instantiate a variable that points to the annotations and use that within the range or with blocks. 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" ]}. Hello, this issue has been opened a while ago, but the problem still occurs. For example, set the USERNAME variable to hello_user: export USERNAME=hello_user. @JParkinson1991 thank you very much for your answer. It contains a configmap that defines its unbound.conf file. Hopefully the explanation in this post can help encourage others to dive into the official repo and take inspiration from its charts. }}servicePort: {{ .Values.rabbitmq.managerPort }}. Maybe there is a hook or something that could be written to preprocess just this? Error: render error in "tpl-bug/templates/configmap.yaml": template: tpl-bug/templates/configmap.yaml:5:17: executing "tpl-bug/templates/configmap.yaml" at
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helm range $key, $value