262 lines
14 KiB
Markdown
262 lines
14 KiB
Markdown
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---
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layout: "docs"
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page_title: "Helm - Kubernetes"
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sidebar_current: "docs-platform-k8s-helm"
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description: |-
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The Consul Helm chart is the recommended way to install and configure Consul on Kubernetes. In addition to running Consul itself, the Helm chart is the primary method for installing and configuring Consul integrations with Kubernetes such as catalog syncing, Connect injection, and more.
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---
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# Helm Chart
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The [Consul Helm chart](https://github.com/hashicorp/consul-helm)
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is the recommended way to install and configure Consul on Kubernetes.
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In addition to running Consul itself, the Helm chart is the primary
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method for installing and configuring Consul integrations with
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Kubernetes such as catalog syncing, Connect injection, and more.
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This page assumes general knowledge of [Helm](https://helm.sh/) and
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how to use it. Using Helm to install Consul will require that Helm is
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properly installed and configured with your Kubernetes cluster.
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-> **Important:** The Helm chart is new and
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may still change significantly over time. Please always run Helm with
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`--dry-run` before any install or upgrade to verify changes.
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## Using the Helm Chart
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To use the Helm chart, you must download or clone the
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[consul-helm GitHub repository](https://github.com/hashicorp/consul-helm)
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and run Helm against the directory. We plan to transition to using a real
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Helm repository soon. When running Helm, we highly recommend you always
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checkout a specific tagged release of the chart to avoid any
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instabilities from master.
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Prior to this, you must have Helm installed and configured both in your
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Kubernetes cluster and locally on your machine. The steps to do this are
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out of the scope of this document, please read the
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[Helm documentation](https://helm.sh/) for more information.
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Example chart usage:
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```sh
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# Clone the chart repo
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$ git clone https://github.com/hashicorp/consul-helm.git
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$ cd consul-helm
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# Checkout a tagged version
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$ git checkout v0.1.0
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# Run Helm
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$ helm install --dry-run ./
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```
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~> **Warning:** By default, the chart will install _everything_: a
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Consul server cluster, client agents on all nodes, feature components, etc.
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This provides a nice out-of-box experience for new users, but may not be
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appropriate for a production setup. Considering setting the `global.enabled`
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value to `false` and opt-in to the various components.
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## Configuration (Values)
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The chart is highly customizable using
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[Helm configuration values](https://docs.helm.sh/using_helm/#customizing-the-chart-before-installing).
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Each value has a sane default tuned for an optimal getting started experience
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with Consul. Before going into production, please review the parameters below
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and consider if they're appropriate for your deployment.
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* <a name="v-global" href="#v-global">`global`</a> - These values are global values that affect multiple components of the chart.
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- <a name="v-global-enabled" href="#v-global-enabled">`enabled`</a> (`boolean: true`) -
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The master enabled/disabled configuration. If this is true, most components
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will be installed by default. If this is false, no components will be installed
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by default and manually opt-in is required, such as by setting
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<a href="#v-">`server.enabled`</a> to true.
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- <a name="v-global-domain" href="#v-global-domain">`domain`</a> (`string: "consul"`) -
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The domain Consul uses for DNS queries. This is used to configure agents both
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for DNS listening but also to know what domain to join to join the cluster.
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This should be consistent throughout the chart, but can be overridden
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per-component as well.
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- <a name="v-global-image" href="#v-global-image">`image`</a> (`string: "consul:latest"`) -
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The name of the Docker image (including any tag) for the containers running
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Consul agents. **This should be pinned to a specific version when running
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in production.** Otherwise, other changes to the chart may inadvertently
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upgrade your Consul version.
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- <a name="v-global-datacenter" href="#v-global-datacenter">`datacenter`</a> (`string: "dc1"`) -
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The name of the datacenter that the agent cluster should register as.
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This must not be changed once the cluster is bootstrapped and running,
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since Consul doesn't yet support an automatic way to change this value.
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* <a name="v-server" href="#v-server">`server`</a> - Values that configure
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running a Consul server cluster within Kubernetes.
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- <a name="v-server-enabled" href="#v-server-enabled">`enabled`</a> (`boolean: global.enabled`) -
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If true, the chart will install all the resources necessary for a Consul
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server cluster. If you're running Consul externally and want agents within
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Kubernetes to join that cluster, this should probably be false.
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- <a name="v-server-image" href="#v-server-image">`image`</a> (`string: global.image`) -
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The name of the Docker image (including any tag) for the containers running
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Consul server agents.
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- <a name="v-server-replicas" href="#v-server-replicas">`replicas`</a> (`integer: 3`) -
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The number of server agents to run. This determines the fault tolerance
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of the cluster. Please see the [deployment table](/docs/internals/consensus.html#deployment-table)
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for more information.
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- <a name="v-server-bootstrapexpect" href="#v-server-bootstrapexpect">`bootstrapExpect`</a> (`integer: 3`) -
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For new clusters, this is the number of servers to wait for before
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performing the initial leader election and bootstrap of the cluster. This
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must be less than or equal to `server.replicas`. This value is only
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used when bootstrapping new clusters, it has no effect during ongoing cluster
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maintenance.
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- <a name="v-server-connect" href="#v-server-connect">`connect`</a> (`boolean: true`) -
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This will enable/disable [Connect](/docs/connect/index.html). Setting this
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to true _will not_ automatically secure pod communication, this setting will
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only enable usage of the feature. Consul will automatically initialize a new
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CA and set of certificates. Additional Connect settings can be configured
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by setting the `server.extraConfig` value.
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- <a name="v-server-disruptionbudget" href="#v-server-disruptionbudget">`disruptionBudget`</a> -
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This configures the
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[PodDisruptionBudget](https://kubernetes.io/docs/tasks/run-application/configure-pdb/)
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for the server cluster.
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* <a name="v-server-disruptionbudget-enabled" href="#v-server-disruptionbudget-enabled">`enabled`</a> (`boolean: true`) -
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This will enable/disable registering a PodDisruptionBudget for
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the server cluster. If this is enabled, it will only register the
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budget so long as the server cluster is enabled.
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* <a name="v-server-disruptionbudget-maxunavailable" href="#v-server-disruptionbudget-maxunavailable">`maxUnavailable`</a> (`integer: null`) -
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The maximum number of unavailable pods. By default, this will be automatically
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computed based on the `server.replicas` value to be `(n/2)-1`.
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- <a name="v-server-extraconfig" href="#v-server-extraconfig">`extraConfig`</a> (`string: "{}"`) -
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A raw string of extra JSON or HCL configuration for Consul servers. This
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will be saved as-is into a ConfigMap that is read by the Consul server agents.
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This can be used to add additional configuration that isn't directly exposed
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by the chart.
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- <a name="v-server-extravolumes" href="#v-server-extravolumes">`extraVolumes`</a> (`array: []`) -
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A list of extra volumes to mount for server agents. This is useful for bringing
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in extra data that can be referenced by other configurations at a well known
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path, such as TLS certificates or Gossip encryption keys.
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The value of this should be a list of objects. Each object has the following
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supports the following keys:
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* <a name="v-server-extravolumes-type" href="#v-server-extravolumes-type">`type`</a> (`string: required`) -
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Type of the volume, must be one of "configMap" or "secret". Case sensitive.
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* <a name="v-server-extravolumes-name" href="#v-server-extravolumes-name">`name`</a> (`string: required`) -
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Name of the configMap or secret to be mounted. This also controls the path
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that it is mounted to. The volume will be mounted to `/config/userconfig/<name>`.
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* <a name="v-server-extravolumes-load" href="#v-server-extravolumes-load">`load`</a> (`boolean: false`) -
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If true, then the agent will be configured to automatically load HCL/JSON
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configuration files from this volume with `-config-dir`. This defaults
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to false.
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- <a name="v-server-resources" href="#v-server-resources">`resources`</a> (`object: {}`) -
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The resource requests (CPU, memory, etc.) for each of the server agents.
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This should be an object mapping directly to a Kubernetes
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[ResourceRequirements](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.11/#resourcerequirements-v1-core) object. If this isn't specified, then the pods
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won't request any specific amount of resources. **Setting this is highly
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recommended.**
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- <a name="v-server-storage" href="#v-server-storage">`storage`</a> (`string: "10Gi"`) -
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The amount of storage to request for the persistant volume backing the
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Consul server data.
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- <a name="v-server-updatepartition" href="#v-server-updatepartition">`updatePartition`</a> (`integer: 0`) -
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This value is used to carefully control a rolling update of Consul server
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agents. This value specifies the
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[partition](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#partitions)
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for performing a rolling update. Please read the linked Kubernetes
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documentation for more information.
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* <a name="v-client" href="#v-client">`client`</a> - Values that configure
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running a Consul client agent on Kubernetes nodes.
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- <a name="v-client-enabled" href="#v-client-enabled">`enabled`</a> (`boolean: global.enabled`) -
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If true, the chart will install all the resources necessary for a Consul
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client on every Kubernetes node. This _does not_ require `server.enabled`,
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since the agents can be configured to join an external cluster.
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- <a name="v-client-image" href="#v-client-image">`image`</a> (`string: global.image`) -
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The name of the Docker image (including any tag) for the containers running
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Consul client agents.
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- <a name="v-client-extraconfig" href="#v-client-extraconfig">`extraConfig`</a> (`string: "{}"`) -
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A raw string of extra JSON or HCL configuration for Consul clients. This
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will be saved as-is into a ConfigMap that is read by the Consul agents.
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This can be used to add additional configuration that isn't directly exposed
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by the chart.
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- <a name="v-client-extravolumes" href="#v-client-extravolumes">`extraVolumes`</a> (`array: []`) -
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A list of extra volumes to mount for client agents. This is useful for bringing
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in extra data that can be referenced by other configurations at a well known
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path, such as TLS certificates or Gossip encryption keys.
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The value of this should be a list of objects. Each object has the following
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supports the following keys:
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* <a name="v-client-extravolumes-type" href="#v-client-extravolumes-type">`type`</a> (`string: required`) -
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Type of the volume, must be one of "configMap" or "secret". Case sensitive.
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* <a name="v-client-extravolumes-name" href="#v-client-extravolumes-name">`name`</a> (`string: required`) -
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Name of the configMap or secret to be mounted. This also controls the path
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that it is mounted to. The volume will be mounted to `/config/userconfig/<name>`.
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* <a name="v-client-extravolumes-load" href="#v-client-extravolumes-load">`load`</a> (`boolean: false`) -
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If true, then the agent will be configured to automatically load HCL/JSON
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configuration files from this volume with `-config-dir`. This defaults
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to false.
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- <a name="v-client-join" href="#v-client-join">`join`</a> (`array<string>: null`) -
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A list of values to specify to `-retry-join`. If this is `null` (default),
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then the clients will attempt to automatically join the server cluster
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running within Kubernetes. This means that with `server.enabled` set to true,
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clients will automatically join that cluster. If `server.enabled` is not
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true, then a value must be specified so the clients can join a valid cluster.
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- <a name="v-client-resources" href="#v-client-resources">`resources`</a> (`object: {}`) -
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The resource requests (CPU, memory, etc.) for each of the client agents.
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This should be an object mapping directly to a Kubernetes
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[ResourceRequirements](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.11/#resourcerequirements-v1-core) object. If this isn't specified, then the pods
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won't request any specific amount of resources.
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* <a name="v-dns" href="#v-dns">`dns`</a> - Values that configure the Consul DNS service.
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- <a name="v-dns-enabled" href="#v-dns-enabled">`enabled`</a> (`boolean: global.enabled`) -
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If true, a `consul-dns` service will be created that exposes port 53 for
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TCP and UDP to the running Consul agents (servers and clients). This can
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then be used to [configure kube-dns](/docs/platform/k8s/dns.html). The Helm
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chart _does not_ automatically configure kube-dns.
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* <a name="v-ui" href="#v-ui">`ui`</a> - Values that configure the Consul UI.
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- <a name="v-ui-enabled" href="#v-ui-enabled">`enabled`</a> (`boolean: global.enabled`) -
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If true, the UI will be enabled. This will only _enable_ the UI, it doesn't
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automatically register any service for external access. The UI will only
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be enabled on server agents. If `server.enabled` is false, then this setting
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has no effect. To expose the UI in some way, you must configure
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`ui.service`.
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- <a name="v-ui-service" href="#v-ui-service">`service`</a> -
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This configures the `Service` resource registered for the Consul UI.
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* <a name="v-ui-service-enabled" href="#v-ui-service-enabled">`enabled`</a> (`boolean: true`) -
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This will enable/disable registering a Kubernetes Service for the Consul UI.
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This value only takes effect if `ui.enabled` is true and taking effect.
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* <a name="v-ui-service-type" href="#v-ui-service-type">`type`</a> (`string: null`) -
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The service type to register. This defaults to `null` which doesn't set
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an explicit service type, which typically is defaulted to "ClusterIP"
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by Kubernetes. The available service types are documented on
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[the Kubernetes website](https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types).
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