--- layout: docs page_title: Install Consul on Kubernetes from the Helm Chart description: >- This topic describes how to install Consul on Kubernetes using the official Consul Helm chart. --- # Install Consul on Kubernetes from the Helm Chart This topic describes how to install Consul on Kubernetes using the official Consul Helm chart. For instruction on how to install Consul on Kubernetes using the Consul K8s CLI, refer to [Installing the Consul K8s CLI](/docs/k8s/installation/install-cli). ## Introduction We recommend using the Consul Helm chart to install Consul on Kubernetes for multi-cluster installations that involve cross-partition or cross datacenter communication. The Helm chart installs and configures all necessary components to run Consul. The configuration enables you to run a server cluster, a client cluster, or both. Consul can run directly on Kubernetes in server or client mode so that you can leverage Consul functionality if your workloads are fully deployed to Kubernetes. For heterogeneous workloads, Consul agents can join a server running inside or outside of Kubernetes. Refer to the [architecture section](/docs/k8s/architecture) to learn more about the general architecture of Consul on Kubernetes. The Helm chart exposes several useful configurations and automatically sets up complex resources, but it does not automatically operate Consul. You must still become familiar with how to monitor, backup, and upgrade the Consul cluster. The Helm chart has no required configuration, so it installs a Consul cluster with default configurations. We strongly recommend that you [learn about the configuration options](/docs/k8s/helm#configuration-values) prior to going to production. -> **Security warning**: By default, Helm installs Consul with security configurations disabled so that the out-of-box experience is optimized for new users. We strongly recommend using a properly-secured Kubernetes cluster or making sure that you understand and enable [Consul’s security features](/docs/security) before going into production. Some security features are not supported in the Helm chart and require additional manual configuration. Refer to the [architecture](/docs/k8s/installation/install#architecture) section to learn more about the general architecture of Consul on Kubernetes. For a hands-on experience with Consul as a service mesh for Kubernetes, follow the [Getting Started with Consul service mesh](https://learn.hashicorp.com/tutorials/consul/service-mesh-deploy?utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) tutorial. ## Requirements - Helm version 3.2+. Visit the [Helm website](https://helm.sh/docs/intro/install/) to download the latest version. ## Install Consul 1. Add the HashiCorp Helm Repository: ```shell-session $ helm repo add hashicorp https://helm.releases.hashicorp.com "hashicorp" has been added to your repositories ``` 1. Verify that you have access to the consul chart: ```shell-session $ helm search repo hashicorp/consul NAME CHART VERSION APP VERSION DESCRIPTION hashicorp/consul 0.39.0 1.11.1 Official HashiCorp Consul Chart ``` 1. Prior to installing via Helm, ensure that the `consul` Kubernetes namespace does not exist, as installing on a dedicated namespace is recommended. ```shell-session $ kubectl get namespace NAME STATUS AGE default Active 18h kube-node-lease Active 18h kube-public Active 18h kube-system Active 18h ``` 1. Install Consul on Kubernetes using Helm. The Helm chart does everything to set up a recommended Consul-on-Kubernetes deployment. After installation, a Consul cluster will be formed, a leader will be elected, and every node will have a running Consul agent. 1. To install the latest version of Consul on Kubernetes, issue the following command to install Consul with the default configuration using Helm. You could also install Consul on a dedicated namespace of your choosing by modifying the value of the `-n` flag for the Helm install. ```shell-session $ helm install consul hashicorp/consul --set global.name=consul --create-namespace --namespace consul ``` 1. To install a specific version of Consul on Kubernetes, issue the following command with `--version` flag to install the specified version with the default configuration using Helm. ```shell-session $ export VERSION=0.43.0 $ helm install consul hashicorp/consul --set global.name=consul --version ${VERSION} --create-namespace --namespace consul ``` ## Custom installation If you want to customize your installation, create a `config.yaml` file to override the default settings. You can learn what settings are available by running `helm inspect values hashicorp/consul` or by reading the [Helm Chart Reference](/docs/k8s/helm). ### Minimal `config.yaml` for Consul service mesh The minimal settings to enable [Consul Service Mesh]((/docs/k8s/connect)) would be captured in the following `config.yaml` config file: ```yaml global: name: consul connectInject: enabled: true controller: enabled: true ``` Once you've created your `config.yaml` file, run `helm install` with the `--values` flag: ```shell-session $ helm install consul hashicorp/consul --create-namespace --namespace consul --values config.yaml NAME: consul ... ``` ### Enable the Consul CNI plugin By default, Consul generates a `connect-inject init` container as part of the Kubernetes pod startup process when Consul is in [transparent proxy mode](/docs/connect/transparent-proxy). The container configures traffic redirection in the service mesh through the sidecar proxy. To configure redirection, the container requires elevated `CAP_NET_ADMIN` privileges, which may not be compatible with security policies in your organization. Instead, you can enable the Consul container network interface (CNI) plugin to perform traffic redirection. Because the plugin is executed by the Kubernetes kubelet, the plugin already has the elevated privileges necessary to configure the network. Add the following configuration to your `config.yaml` file to enable the Consul CNI plugin: ```yaml global: name: consul connectInject: enabled: true cni: enabled: true logLevel: info cniBinDir: "/opt/cni/bin" cniNetDir: "/etc/cni/net.d" ``` ```yaml global: name: consul connectInject: enabled: true cni: enabled: true logLevel: info cniBinDir: "/home/kubernetes/bin" cniNetDir: "/etc/cni/net.d" ``` The following table describes the available CNI plugin options: | Option | Description | Default | | --- | --- | --- | | `cni.enabled` | Boolean value that enables or disables the CNI plugin. If `true`, the plugin is responsible for redirecting traffic in the service mesh. If `false`, redirection is handled by the `connect-inject init` container. | `false` | | `cni.logLevel` | String value that specifies the log level for the installer and plugin. You can specify the following values: `info`, `debug`, `error`. | `info` | | `cni.cniBinDir` | String value that specifies the location on the Kubernetes node where the CNI plugin is installed. | `/opt/cni/bin` | | `cni.cniNetDir` | String value that specifies the location on the Kubernetes node for storing the CNI configuration. | `/etc/cni/net.d` | ### Enable Consul service mesh on select namespaces By default, Consul Service Mesh is enabled on almost all namespaces (with the exception of `kube-system` and `local-path-storage`) within a Kubernetes cluster. You can restrict this to a subset of namespaces by specifying a `namespaceSelector` that matches a label attached to each namespace denoting whether to enable Consul service mesh. In order to default to enabling service mesh on select namespaces by label, the `connectInject.default` value must be set to `true`. ```yaml global: name: consul connectInject: enabled: true default: true namespaceSelector: | matchLabels: connect-inject : enabled controller: enabled: true ``` Label the namespace(s), where you would like to enable Consul Service Mesh. ```shell-session $ kubectl create ns foo $ kubectl label namespace foo connect-inject=enabled ``` Next, run `helm install` with the `--values` flag: ```shell-session $ helm install consul hashicorp/consul --create-namespace --namespace consul --values config.yaml NAME: consul ... ``` ### Update your Consul on Kubernetes configuration If you've already installed Consul and want to make changes, you'll need to run `helm upgrade`. See [Upgrading](/docs/k8s/upgrade) for more details. ## Usage You can view the Consul UI and access the Consul HTTP API after installation. ### Viewing the Consul UI The Consul UI is enabled by default when using the Helm chart. For security reasons, it isn't exposed via a `LoadBalancer` Service by default so you must use `kubectl port-forward` to visit the UI. #### TLS Disabled If running with TLS disabled, the Consul UI will be accessible via http on port 8500: ```shell-session $ kubectl port-forward service/consul-server --namespace consul 8500:8500 ... ``` Once the port is forwarded navigate to [http://localhost:8500](http://localhost:8500). #### TLS Enabled If running with TLS enabled, the Consul UI will be accessible via https on port 8501: ```shell-session $ kubectl port-forward service/consul-server --namespace consul 8501:8501 ... ``` Once the port is forwarded navigate to [https://localhost:8501](https://localhost:8501). ~> You'll need to click through an SSL warning from your browser because the Consul certificate authority is self-signed and not in the browser's trust store. #### ACLs Enabled If ACLs are enabled, you will need to input an ACL token into the UI in order to see all resources and make modifications. To retrieve the bootstrap token that has full permissions, run: ```shell-session $ kubectl get secrets/consul-bootstrap-acl-token --template='{{.data.token | base64decode }}' e7924dd1-dc3f-f644-da54-81a73ba0a178% ``` Then paste the token into the UI under the ACLs tab (without the `%`). ~> NOTE: If using multi-cluster federation, your kubectl context must be in the primary datacenter to retrieve the bootstrap token since secondary datacenters use a separate token with less permissions. #### Exposing the UI via a service If you want to expose the UI via a Kubernetes Service, configure the [`ui.service` chart values](/docs/k8s/helm#v-ui-service). This service will allow requests to the Consul servers so it should not be open to the world. ### Accessing the Consul HTTP API The Consul HTTP API should be accessed by communicating to the local agent running on the same node. While technically any listening agent (client or server) can respond to the HTTP API, communicating with the local agent has important caching behavior, and allows you to use the simpler [`/agent` endpoints for services and checks](/api-docs/agent). For Consul installed via the Helm chart, a client agent is installed on each Kubernetes node. This is explained in the [architecture](/docs/k8s/installation/install#client-agents) section. To access the agent, you may use the [downward API](https://kubernetes.io/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/). An example pod specification is shown below. In addition to pods, anything with a pod template can also access the downward API and can therefore also access Consul: StatefulSets, Deployments, Jobs, etc. ```yaml apiVersion: v1 kind: Pod metadata: name: consul-example spec: containers: - name: example image: 'consul:latest' env: - name: HOST_IP valueFrom: fieldRef: fieldPath: status.hostIP command: - '/bin/sh' - '-ec' - | export CONSUL_HTTP_ADDR="${HOST_IP}:8500" consul kv put hello world restartPolicy: Never ``` An example `Deployment` is also shown below to show how the host IP can be accessed from nested pod specifications: ```yaml apiVersion: apps/v1 kind: Deployment metadata: name: consul-example-deployment spec: replicas: 1 selector: matchLabels: app: consul-example template: metadata: labels: app: consul-example spec: containers: - name: example image: 'consul:latest' env: - name: HOST_IP valueFrom: fieldRef: fieldPath: status.hostIP command: - '/bin/sh' - '-ec' - | export CONSUL_HTTP_ADDR="${HOST_IP}:8500" consul kv put hello world ``` ## Next Steps If you are still considering a move to Kubernetes, or to Consul on Kubernetes specifically, our [Migrate to Microservices with Consul Service Mesh on Kubernetes](https://learn.hashicorp.com/collections/consul/microservices?utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) collection uses an example application written by a fictional company to illustrate why and how organizations can migrate from monolith to microservices using Consul service mesh on Kubernetes. The case study in this collection should provide information valuable for understanding how to develop services that leverage Consul during any stage of your microservices journey.