Rancher helm charts

Rancher helm charts DEFAULT

Single Node Installs

When performing single-node installs, upgrades, or rollbacks, you can use tags to install a specific version of Rancher.

Server Tags

Rancher Server is distributed as a Docker image, which have tags attached to them. You can specify this tag when entering the command to deploy Rancher. Remember that if you use a tag without an explicit version (like or ), you must explicitly pull a new version of that image tag. Otherwise, any image cached on the host will be used.

TagDescription
Our latest development release. These builds are validated through our CI automation framework. These releases are not recommended for production environments.
Our newest stable release. This tag is recommended for production.
You can install specific versions of Rancher by using the tag from a previous release. See what's available at DockerHub.

Note: The tag or any tag with or another suffix is meant for the Rancher testing team to validate. You should not use these tags, as these builds are not officially supported.

High Availability Installs

When installing, upgrading, or rolling back Rancher Server in a high availability configuration, Rancher server is installed using a Helm chart on a Kubernetes cluster. Therefore, as you prepare to install or upgrade a high availability Rancher configuration, you must add a Helm chart repository that contains the charts for installing Rancher.

Helm Chart Repositories

Rancher provides two different Helm chart repositories to choose from.

We align our latest and stable Helm chart repositories with the Docker tags that are used for a single node installation. Therefore, the repository will contain charts for all the Rancher versions that have been tagged as . When a Rancher version has been promoted to the , it will get added to the repository.

Each Helm chart repository is named for the labels attached to each Rancher image. In other words, the repository contains charts labeled as , the repository contains charts labeled , etc.)

TypeCommand to Add the RepoDescription of the Repo
rancher-latestAdds a repository of Helm charts for the latest versions of Rancher. We recommend using this repo for testing out new Rancher builds.
rancher-stableAdds a repository of Helm charts for older, stable versions of Rancher. We recommend using this repo for production environments.

Instructions on when to select these repos are available below in Switching to a Different Helm Chart Repository.

Note: The introduction of the and Helm Chart repositories was introduced after Rancher v2.1.0, so the repository contains some Rancher versions that were never marked as . The versions of Rancher that were tagged as prior to v2.1.0 are v2.0.4, v2.0.6, v2.0.8. Post v2.1.0, all charts in the repository will correspond with any Rancher version tagged as .

Helm Chart Versions

Up until the initial release of the Helm chart for Rancher v2.1.0, the version of the Helm chart matched the Rancher version (i.e ).

Since there are times where the Helm chart will require changes without any changes to the Rancher version, we have moved to a versioning scheme using for the Helm charts.

Run to view which Rancher version will be launched for the your Helm chart.

Switching to a Different Helm Chart Repository

After installing Rancher, if you want to change which Helm chart repository to install Rancher from, you will need to follow these steps.

  1. List the current Helm chart repositories.

    ``` helm repo list

    NAME URL
    stable https://kubernetes-charts.storage.googleapis.com rancher-

  2. Remove the existing Helm Chart repository that contains your charts to install Rancher, which will either be or depending on what you had initially added.

  3. Add the Helm chart repository that you want to start installing Rancher from. Replace with the chart repository that you want to use (i.e. or ).

  4. Continue to follow the steps to upgrade Rancher from the new Helm chart repository.

Sours: https://sphinx-hxl.readthedocs.io/en/latest/installation/server-tags/_index/

Rancher Catalog

A curated collection of Rancher 2.0 enhanced Helm charts. To see how catalogs are added and used in Rancher 2.0 take a look at the docs page.

Rancher Chart Structure

A Rancher chart repository differs slightly in directory structure from upstream repos in that it includes an directory. Though Rancher can use native Helm repositories as well.

A Rancher chart also has two additional files an file that provides a high level overview display in the Rancher 2.0 UI and a file defining questions to prompt the user with.

See the upstream Helm chart developer reference for a complete walk through of developing charts.

To convert an upstream chart to take advantage of Rancher's enhanced UX, first create an file in the root of your chart.

Then add a file to prompt the user for something.

The above will prompt the user with a true / false radio button in the UI for enabling persistent storage. If the user choses to enable persistent storage they will be prompted for a storage class and volume size.

The above file also provides a list of categories that this chart fits into. This helps users navigate and filtering when browsing the catalog UI.

Question Variable Reference

VariableTypeRequiredDescription
variablestringtruedefine the variable name specified in the file, using for nested object.
labelstringtruedefine the UI label.
descriptionstringfalsespecify the description of the variable.
typestringfalsedefault to if not specified (current supported types are string, multiline, boolean, int, enum, password, storageclass, hostname, pvc, and secret).
requiredboolfalsedefine if the variable is required or not (true | false)
defaultstringfalsespecify the default value.
groupstringfalsegroup questions by input value.
min_lengthintfalsemin character length.
max_lengthintfalsemax character length.
minintfalsemin integer length.
maxintfalsemax integer length.
options[]stringfalsespecify the options when the vriable type is , for example: options:
- "ClusterIP"
- "NodePort"
- "LoadBalancer"
valid_charsstringfalseregular expression for input chars validation.
invalid_charsstringfalseregular expression for invalid input chars validation.
subquestions[]subquestionfalseadd an array of subquestions.
show_ifstringfalseshow current variable if conditional variable is true, for example
show_subquestion_ifstringfalseshow subquestions if is true or equal to one of the options. for example

subquestions: cannot contain or keys, but all other keys in the above table are supported.

License

Copyright (c) 2018 Rancher Labs, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Sours: https://github.com/rancher/charts
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Helm Charts in Rancher

Rancher provides the ability to use a catalog of Helm charts that make it easy to repeatedly deploy applications.

  • Catalogs are GitHub repositories or Helm Chart repositories filled with applications that are ready-made for deployment. Applications are bundled in objects called Helm charts.
  • Helm charts are a collection of files that describe a related set of Kubernetes resources. A single chart might be used to deploy something simple, like a memcached pod, or something complex, like a full web app stack with HTTP servers, databases, caches, and so on.

Rancher improves on Helm catalogs and charts. All native Helm charts can work within Rancher, but Rancher adds several enhancements to improve their user experience.

This section covers the following topics:

Within Rancher, you can manage catalogs at three different scopes. Global catalogs are shared across all clusters and project. There are some use cases where you might not want to share catalogs between different clusters or even projects in the same cluster. By leveraging cluster and project scoped catalogs, you will be able to provide applications for specific teams without needing to share them with all clusters and/or projects.

ScopeDescriptionAvailable As of
GlobalAll clusters and all projects can access the Helm charts in this catalogv2.0.0
ClusterAll projects in the specific cluster can access the Helm charts in this catalogv2.2.0
ProjectThis specific cluster can access the Helm charts in this catalogv2.2.0

Applicable as of v2.4.0

In November 2019, Helm 3 was released, and some features were deprecated or refactored. It is not fully backwards compatible with Helm 2. Therefore, catalogs in Rancher need to be separated, with each catalog only using one Helm version. This will help reduce app deployment issues as your Rancher users will not need to know which version of your chart is compatible with which Helm version - they can just select a catalog, select an app and deploy a version that has already been vetted for compatibility.

When you create a custom catalog, you will have to configure the catalog to use either Helm 2 or Helm 3. This version cannot be changed later. If the catalog is added with the wrong Helm version, it will need to be deleted and re-added.

When you launch a new app from a catalog, the app will be managed by the catalog’s Helm version. A Helm 2 catalog will use Helm 2 to manage all of the apps, and a Helm 3 catalog will use Helm 3 to manage all apps.

By default, catalogs are assumed to be deployed using Helm 2. If you run an app in Rancher before v2.4.0, then upgrade to Rancher v2.4.0+, the app will still be managed by Helm 2. If the app was already using a Helm 3 Chart (API version 2) it will no longer work in v2.4.0+. You must either downgrade the chart’s API version or recreate the catalog to use Helm 3.

Charts that are specific to Helm 2 should only be added to a Helm 2 catalog, and Helm 3 specific charts should only be added to a Helm 3 catalog.

Applicable as of v2.4.0

  • If you want to ensure that the security permissions are being pulled from the kubeconfig file
  • If you want to utilize apiVersion features such as creating a library chart to reduce code duplication, or moving your requirements from the into the

Overall Helm 3 is a movement towards a more standardized Kubernetes feel. As the Kubernetes community has evolved, standards and best practices have as well. Helm 3 is an attempt to adopt those practices and streamline how charts are maintained.

Applicable as of v2.4.0

With the use of the OpenAPI schema to validate your rendered templates in Helm 3, you will find charts that worked in Helm 2 may not work in Helm 3. This will require you to update your chart templates to meet the new validation requirements. This is one of the main reasons support for Helm 2 and Helm 3 was provided starting in Rancher 2.4.x, as not all charts can be deployed immediately in Helm 3.

Helm 3 does not create a namespace for you, so you will have to provide an existing one. This can cause issues if you have integrated code with Helm 2, as you will need to make code changes to ensure a namespace is being created and passed in for Helm 3. Rancher will continue to manage namespaces for Helm to ensure this does not impact your app deployment.

apiVersion is now reserved for Helm 3 charts. This apiVersion enforcement could cause issues as older versions of Helm 2 did not validate the apiVersion in the file. In general, your Helm 2 chart’s apiVersion should be set to and your Helm 3 chart’s apiVersion should be set to . You can install charts with apiVersion with Helm 3, but you cannot install charts into Helm 2.

Within Rancher, there are default catalogs packaged as part of Rancher. These can be enabled or disabled by an administrator. For details, refer to the section on managing built-in global catalogs.

There are two types of catalogs in Rancher: Built-in global catalogs and custom catalogs.

Any user can create custom catalogs to add into Rancher. Custom catalogs can be added into Rancher at the global level, cluster level, or project level. For details, refer to the section on adding custom catalogs and the catalog configuration reference.

In Rancher, applications are deployed from the templates in a catalog. This section covers the following topics:

Charts now support the fields and in the file to specify the versions of Rancher that the chart is compatible with. When using the UI, only app versions that are valid for the version of Rancher running will be shown. API validation is done to ensure apps that don’t meet the Rancher requirements cannot be launched. An app that is already running will not be affected on a Rancher upgrade if the newer Rancher version does not meet the app’s requirements.

Available as v2.2.0

When creating applications that span multiple Kubernetes clusters, a Global DNS entry can be created to route traffic to the endpoints in all of the different clusters. An external DNS server will need be programmed to assign a fully qualified domain name (a.k.a FQDN) to your application. Rancher will use the FQDN you provide and the IP addresses where your application is running to program the DNS. Rancher will gather endpoints from all the Kubernetes clusters running your application and program the DNS.

For more information on how to use this feature, see Global DNS.

Sours: https://rancher.com/docs/rancher/v2.0-v2.4/en/helm-charts/
What is Helm in Kubernetes? Helm and Helm Charts explained - Kubernetes Tutorial 23

Rancher Helm Chart Options

This page is a configuration reference for the Rancher Helm chart.

For help choosing a Helm chart version, refer to this page.

For information on enabling experimental features, refer to this page.

Common Options

OptionDefault ValueDescription
” “ - the Fully Qualified Domain Name for your Rancher Server
“rancher” - Where to get the cert for the ingress. - “rancher, letsEncrypt, secret”
” “ - Your email address
“production” - Valid options: “staging, production”
false - Set to true if your cert is signed by a private CA

Advanced Options

OptionDefault ValueDescription
false - See Additional Trusted CAs
“true” - Have Rancher detect and import the “local” Rancher server cluster. Note: This option is no longer available in v2.5.0. Consider using the option to prevent users from modifying the local cluster.
“preferred” - AntiAffinity rule for Rancher pods - “preferred, required”
“sidecar” - Stream to sidecar container console or hostPath volume - “sidecar, hostPath”
”/var/log/rancher/audit” - log file destination on host (only applies when is set to )
0 - set the API Audit Log level. 0 is off. [0-3]
1 - maximum number of days to retain old audit log files (only applies when is set to )
1 - maximum number of audit log files to retain (only applies when is set to )
100 - maximum size in megabytes of the audit log file before it gets rotated (only applies when is set to )
“busybox” - Image location for busybox image used to collect audit logs
”” - set cert-manager compatibility
false - set debug flag on rancher server
[] - set additional environment variables for Rancher
[] - list of names of Secret resource containing private registry credentials
”” - Add additional Nginx configuration. Can be used for proxy configuration.
{} - additional annotations to customize the ingress
trueWhen set to false, Helm will not install a Rancher ingress. Set the option to false to deploy your own ingress. Available as of v2.5.6
”” - optional ingress class for the cert-manager acmesolver ingress that responds to the Let’s Encrypt ACME challenges. Options: traefik, nginx.
“127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,.svc,.cluster.local,cattle-system.svc” - comma separated list of hostnames or ip address not to use the proxy
”” - HTTP[S] proxy server for Rancher
“rancher/rancher” - rancher image source
“IfNotPresent” - Override imagePullPolicy for rancher server images - “Always”, “Never”, “IfNotPresent”
same as chart version - rancher/rancher image tag
3 - Number of replicas of Rancher pods
{} - rancher pod resource requests & limits
Available in Rancher v2.5 - When this option is set to true, the initial Rancher user has restricted access to the local Kubernetes cluster to prevent privilege escalation. For more information, see the section about the restricted-admin role.
”” - private registry to be used for all system Docker images, e.g., http://registry.example.com/
“ingress” - See External TLS Termination for details. - “ingress, external”
- select to use the system-charts packaged with Rancher server. This option is used for air gapped installations.

API Audit Log

Enabling the API Audit Log.

You can collect this log as you would any container log. Enable logging for the Project on the Rancher server cluster.

By default enabling Audit Logging will create a sidecar container in the Rancher pod. This container () will stream the log to . You can collect this log as you would any container log. When using the sidecar as the audit log destination, the , , , and options do not apply. It’s advised to use your OS or Docker daemon’s log rotation features to control disk space use. Enable logging for the Rancher server cluster or System Project.

Set the to to forward logs to volume shared with the host system instead of streaming to a sidecar container. When setting the destination to you may want to adjust the other auditLog parameters for log rotation.

Setting Extra Environment Variables

You can set extra environment variables for Rancher server using . This list uses the same and keys as the container manifest definitions. Remember to quote the values.

TLS Settings

When you install Rancher inside of a Kubernetes cluster, TLS is offloaded at the cluster’s ingress controller. The possible TLS settings depend on the used ingress controller.

See TLS settings for more information and options.

Import Cluster

By default Rancher server will detect and import the cluster it’s running on. User with access to the cluster will essentially have “root” access to all the clusters managed by Rancher server.

Important: If you turn addLocal off, most Rancher v2.5 features won’t work, including the EKS provisioner.

If this is a concern in your environment you can set this option to “false” on your initial install.

This option is only effective on the initial Rancher install. See Issue 16522 for more information.

Customizing your Ingress

To customize or use a different ingress with Rancher server you can set your own Ingress annotations.

Example on setting a custom certificate issuer:

Example on setting a static proxy header with . This value is parsed like a template so variables can be used.

HTTP Proxy

Rancher requires internet access for some functionality (helm charts). Use to set your proxy server.

Add your IP exceptions to the list. Make sure you add the Pod cluster IP range (default: ), Service cluster IP range (default: ), the internal cluster domains (default: ) and any worker cluster nodes. Rancher supports CIDR notation ranges in this list.

Additional Trusted CAs

If you have private registries, catalogs or a proxy that intercepts certificates, you may need to add additional trusted CAs to Rancher.

Once the Rancher deployment is created, copy your CA certs in pem format into a file named and use to create the secret in the namespace.

Private Registry and Air Gap Installs

For details on installing Rancher with a private registry, see:

We recommend configuring your load balancer as a Layer 4 balancer, forwarding plain 80/tcp and 443/tcp to the Rancher Management cluster nodes. The Ingress Controller on the cluster will redirect http traffic on port 80 to https on port 443.

You may terminate the SSL/TLS on a L7 load balancer external to the Rancher cluster (ingress). Use the option and point your load balancer at port http 80 on all of the Rancher cluster nodes. This will expose the Rancher interface on http port 80. Be aware that clients that are allowed to connect directly to the Rancher cluster will not be encrypted. If you choose to do this we recommend that you restrict direct access at the network level to just your load balancer.

Note: If you are using a Private CA signed certificate, add and see Adding TLS Secrets - Using a Private CA Signed Certificate to add the CA cert for Rancher.

Your load balancer must support long lived websocket connections and will need to insert proxy headers so Rancher can route links correctly.

Configuring Ingress for External TLS when Using NGINX v0.25

In NGINX v0.25, the behavior of NGINX has changed regarding forwarding headers and external TLS termination. Therefore, in the scenario that you are using external TLS termination configuration with NGINX v0.25, you must edit the to enable the option for ingress:

Required Headers

    Recommended Timeouts

    • Read Timeout:
    • Write Timeout:
    • Connect Timeout:

    Health Checks

    Rancher will respond to health checks on the endpoint.

    Example NGINX config

    This NGINX configuration is tested on NGINX 1.14.

    Note: This NGINX configuration is only an example and may not suit your environment. For complete documentation, see NGINX Load Balancing - HTTP Load Balancing.

    • Replace , and with the IP addresses of the nodes in your cluster.
    • Replace both occurrences of to the DNS name for Rancher.
    • Replace and to the location of the server certificate and the server certificate key respectively.
    Sours: https://rancher.com/docs/rancher/v2.5/en/installation/install-rancher-on-k8s/chart-options/

    Helm charts rancher

    Helm Integration¶

    Helm is the package management tool of choice for Kubernetes. Helm charts provide templating syntax for Kubernetes YAML manifest documents. With Helm we can create configurable deployments instead of just using static files. For more information about creating your own catalog of deployments, check out the docs at https://helm.sh/docs/intro/quickstart/.

    RKE2 does not require any special configuration to use with Helm command-line tools. Just be sure you have properly set up your kubeconfig as per the section about cluster access. RKE2 does include some extra functionality to make deploying both traditional Kubernetes resource manifests and Helm Charts even easier with the rancher/helm-release CRD.

    This section covers the following topics:

    Automatically Deploying Manifests and Helm Charts¶

    Any Kubernetes manifests found in will automatically be deployed to RKE2 in a manner similar to . Manifests deployed in this manner are managed as AddOn custom resources, and can be viewed by running . You will find AddOns for packaged components such as CoreDNS, Local-Storage, Nginx-Ingress, etc. AddOns are created automatically by the deploy controller, and are named based on their filename in the manifests directory.

    It is also possible to deploy Helm charts as AddOns. RKE2 includes a Helm Controller that manages Helm charts using a HelmChart Custom Resource Definition (CRD).

    Using the Helm CRD¶

    The HelmChart resource definition captures most of the options you would normally pass to the command-line tool. Here's an example of how you might deploy Grafana from the default chart repository, overriding some of the default chart values. Note that the HelmChart resource itself is in the namespace, but the chart's resources will be deployed to the namespace.

    HelmChart Field Definitions¶

    FieldDefaultDescriptionHelm Argument / Flag Equivalent
    nameHelm Chart nameNAME
    spec.chartHelm Chart name in repository, or complete HTTPS URL to chart archive (.tgz)CHART
    spec.targetNamespacedefaultHelm Chart target namespace
    spec.versionHelm Chart version (when installing from repository)
    spec.repoHelm Chart repository URL
    spec.helmVersionv3Helm version to use ( or )
    spec.bootstrapFalseSet to True if this chart is needed to bootstrap the cluster (Cloud Controller Manager, etc)
    spec.setOverride simple default Chart values. These take precedence over options set via valuesContent. /
    spec.valuesContentOverride complex default Chart values via YAML file content
    spec.chartContentBase64-encoded chart archive .tgz - overrides spec.chartCHART

    Customizing Packaged Components with HelmChartConfig¶

    To allow overriding values for packaged components that are deployed as HelmCharts (such as Canal, CoreDNS, Nginx-Ingress, etc), RKE2 supports customizing deployments via a resources. The resource must match the name and namespace of its corresponding HelmChart, and supports providing additional , which is passed to the command as an additional value file.

    Note: HelmChart values override HelmChart and HelmChartConfig settings.

    For example, to customize the packaged CoreDNS configuration, you can create a file named and populate it with the following content:

    Sours: https://docs.rke2.io/helm/
    What is Helm?

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