Temporal is a distributed, scalable, durable, and highly available orchestration engine designed to execute asynchronous long-running business logic in a resilient way.
This repo contains a V3 Helm chart that deploys Temporal to a Kubernetes cluster. The dependencies that are bundled with this solution by default offer a baseline configuration to experiment with Temporal software. This Helm chart can also be used to install just the Temporal server, configured to connect to dependencies (such as a Cassandra, MySQL, or PostgreSQL database) that you may already have available in your environment.
The only portions of the helm chart that are considered production ready are the parts that configure and manage Temporal itself. Cassandra, Elasticsearch, Prometheus, and Grafana are all using minimal development configurations, and should be reconfigured in a production deployment.
This Helm Chart code is tested by a dedicated test pipeline. It is also used extensively by other Temporal pipelines for testing various aspects of Temporal systems. Our test pipeline currently uses Helm 3.1.1.
This sequence assumes
- that your system is configured to access a kubernetes cluster (e. g. AWS EKS, kind, or minikube)
- that your machine has the following installed and able to access your cluster:
This repo only contains one chart currently, but is structured in the standard helm repo way. This means you will find the chart in the charts/temporal directory. All example helm commands below should be run from that directory.
There are two ways to install the Temporal chart, via our helm repo, or using a local git clone of this repo.
The Helm repo is the preferred method of installing the chart as it avoids the need for you to clone the repo locally, and also ensures you are using a release which has been tested. All of the examples in this README will use the Helm repo to install the chart.
Note: The values files that we refer to in the examples are not available from the Helm repo. You will need to download them from Github to use them.
The second way of installing the Temporal chart is to clone this git repo and install from there. This method is useful if you are testing changes to the helm chart, but is otherwise not recommended. To use this method, rather than passing --repo https://go.temporal.io/helm-charts <options> temporal as in the examples below, run helm install <options> . from within the charts/temporal directory to tell helm to use the local directory (.) for the chart.
If you are using a git clone, you will need to download the Helm dependencies before you install the chart:
helm dependencies updateTemporal can be configured to run with various dependencies. The default "Batteries Included" Helm Chart configuration deploys and configures the following components:
- Cassandra
- Elasticsearch
- Prometheus
- Grafana
The sections that follow describe various deployment configurations, from a minimal one-replica installation using included dependencies, to a replicated deployment on existing infrastructure.
To install Temporal in a limited but working and self-contained configuration (one replica of Cassandra, Elasticsearch and each of Temporal's services, no metrics), you can run:
helm install \
--repo https://go.temporal.io/helm-charts \
--set server.replicaCount=1 \
--set cassandra.config.cluster_size=1 \
--set elasticsearch.replicas=1 \
--set prometheus.enabled=false \
--set grafana.enabled=false \
temporaltest temporal \
--timeout 15mThis configuration consumes limited resources and it is useful for small scale tests (such as using minikube).
Note: It used to be possible to install Temporal with just Cassandra. Since Temporal 1.21, this is no longer supported. Cassandra is not supported as a visibility store, so Elasticsearch or an SQL store must be enabled.
Below is an example of an environment installed in this configuration:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
temporaltest-admintools-6cdf56b869-xdxz2 1/1 Running 0 11m
temporaltest-cassandra-0 1/1 Running 0 11m
temporaltest-frontend-5d5b6d9c59-v9g5j 1/1 Running 2 11m
temporaltest-history-64b9ddbc4b-bwk6j 1/1 Running 2 11m
temporaltest-matching-c8887ddc4-jnzg2 1/1 Running 2 11m
temporaltest-metrics-server-7fbbf65cff-rp2ks 1/1 Running 0 11m
temporaltest-web-77f68bff76-ndkzf 1/1 Running 0 11m
temporaltest-worker-7c9d68f4cf-8tzfw 1/1 Running 2 11m
This method requires a three node kubernetes cluster to successfully bring up all the dependencies.
When installed without manully setting dependency replicas to 1, this Temporal Helm Chart configures Temporal to run with a three node Cassandra cluster (for persistence) and Elasticsearch (for "visibility" features), Prometheus, and Grafana. By default, Temporal Helm Chart installs all dependencies, out of the box.
To install Temporal with all of its dependencies run this command:
helm install --repo https://go.temporal.io/helm-charts temporaltest temporal --timeout 900sTo use your own instance of Elasticsearch, MySQL, PostgreSQL, or Cassandra, please read the "Bring Your Own" sections below.
Other components (Prometheus, Grafana) can be omitted from the installation by setting their corresponding enable flag to false:
helm install \
--repo https://go.temporal.io/helm-charts \
--set prometheus.enabled=false \
--set grafana.enabled=false \
temporaltest temporal \
--timeout 900sYou may need to provide your own sidecar containers.
For an example, review the values for Google's cloud sql proxy in the values/values.cloudsqlproxy.yaml and pass that file to helm install:
helm install --repo https://go.temporal.io/helm-charts -f values/values.cloudsqlproxy.yaml temporaltest temporal --timeout 900sYou might already be operating an instance of Elasticsearch that you want to use with Temporal.
To do so, fill in the relevant configuration values in values.elasticsearch.yaml, and pass the file to 'helm install'.
Example:
helm install --repo https://go.temporal.io/helm-charts -f values/values.elasticsearch.yaml temporaltest temporal --timeout 900sYou might already be operating a MySQL instance that you want to use with Temporal.
In this case, create and configure temporal databases on your MySQL host with temporal-sql-tool. The tool is part of temporal repo, and it relies on the schema definition, in the same repo.
Here are example commands you can use to create and initialize the databases:
# in https://github.com/temporalio/temporal git repo dir
export SQL_PLUGIN=mysql8
export SQL_HOST=mysql_host
export SQL_PORT=3306
export SQL_USER=mysql_user
export SQL_PASSWORD=mysql_password
make temporal-sql-tool
./temporal-sql-tool --database temporal create-database
SQL_DATABASE=temporal ./temporal-sql-tool setup-schema -v 0.0
SQL_DATABASE=temporal ./temporal-sql-tool update -schema-dir schema/mysql/v8/temporal/versioned
./temporal-sql-tool --database temporal_visibility create-database
SQL_DATABASE=temporal_visibility ./temporal-sql-tool setup-schema -v 0.0
SQL_DATABASE=temporal_visibility ./temporal-sql-tool update -schema-dir schema/mysql/v8/visibility/versionedOnce you've initialized the two databases, fill in the configuration values in values/values.mysql.yaml, and run
helm install --repo https://go.temporal.io/helm-charts -f values/values.mysql.yaml temporaltest temporal --timeout 900sAlternatively, instead of modifying values/values.mysql.yaml, you can supply those values in your command line:
helm install \
--repo https://go.temporal.io/helm-charts \
-f values/values.mysql.yaml \
--set elasticsearch.enabled=false \
--set server.config.persistence.default.sql.user=mysql_user \
--set server.config.persistence.default.sql.password=mysql_password \
--set server.config.persistence.visibility.sql.user=mysql_user \
--set server.config.persistence.visibility.sql.password=mysql_password \
--set server.config.persistence.default.sql.host=mysql_host \
--set server.config.persistence.visibility.sql.host=mysql_host \
temporaltest temporal \
--timeout 900sNOTE: Requires MySQL 8.0.17+, older versions are not supported.
You might already be operating a PostgreSQL instance that you want to use with Temporal.
In this case, create and configure temporal databases on your PostgreSQL host with temporal-sql-tool. The tool is part of temporal repo, and it relies on the schema definition, in the same repo.
Here are example commands you can use to create and initialize the databases:
# in https://github.com/temporalio/temporal git repo dir
export SQL_PLUGIN=postgres12
export SQL_HOST=postgresql_host
export SQL_PORT=5432
export SQL_USER=postgresql_user
export SQL_PASSWORD=postgresql_password
make temporal-sql-tool
./temporal-sql-tool --database temporal create-database
SQL_DATABASE=temporal ./temporal-sql-tool setup-schema -v 0.0
SQL_DATABASE=temporal ./temporal-sql-tool update -schema-dir schema/postgresql/v12/temporal/versioned
./temporal-sql-tool --database temporal_visibility create-database
SQL_DATABASE=temporal_visibility ./temporal-sql-tool setup-schema -v 0.0
SQL_DATABASE=temporal_visibility ./temporal-sql-tool update -schema-dir schema/postgresql/v12/visibility/versionedOnce you initialized the two databases, fill in the configuration values in values/values.postgresql.yaml, and run
helm install --repo https://go.temporal.io/helm-charts -f values/values.postgresql.yaml temporaltest temporal --timeout 900sAlternatively, instead of modifying values/values.postgresql.yaml, you can supply those values in your command line:
helm install \
--repo https://go.temporal.io/helm-charts \
-f values/values.postgresql.yaml \
--set elasticsearch.enabled=false \
--set server.config.persistence.default.sql.user=postgresql_user \
--set server.config.persistence.default.sql.password=postgresql_password \
--set server.config.persistence.visibility.sql.user=postgresql_user \
--set server.config.persistence.visibility.sql.password=postgresql_password \
--set server.config.persistence.default.sql.host=postgresql_host \
--set server.config.persistence.visibility.sql.host=postgresql_host \
temporaltest temporal --timeout 900sNOTE: Requires PostgreSQL 12+, older versions are not supported.
You might already be operating a Cassandra instance that you want to use with Temporal.
In this case, create and setup keyspaces in your Cassandra instance with temporal-cassandra-tool. The tool is part of temporal repo, and it relies on the schema definition, in the same repo.
Here are example commands you can use to create and initialize the keyspaces:
# in https://github.com/temporalio/temporal git repo dir
export CASSANDRA_HOST=cassandra_host
export CASSANDRA_PORT=9042
export CASSANDRA_USER=cassandra_user
export CASSANDRA_PASSWORD=cassandra_user_password
./temporal-cassandra-tool create-Keyspace -k temporal
CASSANDRA_KEYSPACE=temporal ./temporal-cassandra-tool setup-schema -v 0.0
CASSANDRA_KEYSPACE=temporal ./temporal-cassandra-tool update -schema-dir schema/cassandra/temporal/versionedOnce you initialized the two keyspaces, fill in the configuration values in values/values.cassandra.yaml, and run
helm install --repo https://go.temporal.io/helm-charts -f values/values.cassandra.yaml temporaltest temporal --timeout 900sNote that Temporal cannot run without setting up a store for Visibility, and Cassandra is not a supported database for Visibility. We recommend using Elasticsearch in this case.
By default archival is disabled. You can enable it with one of the three provider options:
- File Store, values file
values/values.archival.filestore.yaml - S3, values file
values/values.archival.s3.yaml - GCloud, values file
values/values.archival.gcloud.yaml
So to use the minimal command again and to enable archival with file store provider:
helm install \
--repo https://go.temporal.io/helm-charts \
-f values/values.archival.filestore.yaml \
--set server.replicaCount=1 \
--set cassandra.config.cluster_size=1 \
--set prometheus.enabled=false \
--set grafana.enabled=false \
--set elasticsearch.enabled=false \
temporaltest temporal \
--timeout 15mNote that if archival is enabled, it is also enabled for all newly created namespaces. Make sure to update the specific archival provider values file to set your configs.
If a live application environment already uses systems that Temporal can use as dependencies, then those systems can continue to be used. This Helm chart can install the minimal pieces of Temporal so that it can then be configured to use those systems as its dependencies.
The example below demonstrates a few things:
- How to set values via the command line rather than the environment.
- How to configure a database (shows Cassandra, but MySQL works the same way)
- How to enable TLS for the database connection.
helm install \
--repo https://go.temporal.io/helm-charts \
-f values/values.cassandra.yaml \
-f values/values.elasticsearch.yaml \
--set elasticsearch.enabled=true \
--set grafana.enabled=false \
--set prometheus.enabled=false \
--set server.replicaCount=5 \
--set server.config.persistence.default.cassandra.hosts=cassandra.data.host.example \
--set server.config.persistence.default.cassandra.user=cassandra_user \
--set server.config.persistence.default.cassandra.password=cassandra_user_password \
--set server.config.persistence.default.cassandra.tls.caData=$(base64 --wrap=0 cassandra.ca.pem) \
--set server.config.persistence.default.cassandra.tls.enabled=true \
--set server.config.persistence.default.cassandra.replicationFactor=3 \
--set server.config.persistence.default.cassandra.keyspace=temporal \
temporaltest temporal \
--timeout 15m \
--waitYou can use your favorite kubernetes tools (k9s, kubectl, etc.) to interact with your cluster.
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
...
temporaltest-admintools ClusterIP 172.20.237.59 <none> 22/TCP 15m
temporaltest-frontend-headless ClusterIP None <none> 7233/TCP,9090/TCP 15m
temporaltest-history-headless ClusterIP None <none> 7234/TCP,9090/TCP 15m
temporaltest-matching-headless ClusterIP None <none> 7235/TCP,9090/TCP 15m
temporaltest-worker-headless ClusterIP None <none> 7239/TCP,9090/TCP 15m
...$ kubectl get pods
...
temporaltest-admintools-7b6c599855-8bk4x 1/1 Running 0 25m
temporaltest-frontend-54d94fdcc4-bx89b 1/1 Running 2 25m
temporaltest-history-86d8d7869-lzb6f 1/1 Running 2 25m
temporaltest-matching-6c7d6d7489-kj5pj 1/1 Running 3 25m
temporaltest-worker-769b996fd-qmvbw 1/1 Running 2 25m
...
You can also shell into admin-tools container via k9s or by running kubectl exec:
$ kubectl exec -it services/temporaltest-admintools /bin/bash
bash-5.0#
From there, you can use tctl or the temporal CLI:
bash-5.0# tctl namespace list
Name: temporal-system
Id: 32049b68-7872-4094-8e63-d0dd59896a83
Description: Temporal internal system namespace
OwnerEmail: [email protected]
NamespaceData: map[string]string(nil)
Status: Registered
RetentionInDays: 7
EmitMetrics: true
ActiveClusterName: active
Clusters: active
HistoryArchivalStatus: Disabled
VisibilityArchivalStatus: Disabled
Bad binaries to reset:
+-----------------+----------+------------+--------+
| BINARY CHECKSUM | OPERATOR | START TIME | REASON |
+-----------------+----------+------------+--------+
+-----------------+----------+------------+--------+
bash-5.0# tctl --namespace nonesuch namespace desc
Error: Namespace nonesuch does not exist.
Error Details: Namespace nonesuch does not exist.
bash-5.0# tctl --namespace nonesuch namespace re
Namespace nonesuch successfully registered.
bash-5.0# tctl --namespace nonesuch namespace desc
Name: nonesuch
UUID: 465bb575-8c01-43f8-a67d-d676e1ae5eae
Description:
OwnerEmail:
NamespaceData: map[string]string(nil)
Status: Registered
RetentionInDays: 3
EmitMetrics: false
ActiveClusterName: active
Clusters: active
HistoryArchivalStatus: ArchivalStatusDisabled
VisibilityArchivalStatus: ArchivalStatusDisabled
Bad binaries to reset:
+-----------------+----------+------------+--------+
| BINARY CHECKSUM | OPERATOR | START TIME | REASON |
+-----------------+----------+------------+--------+
+-----------------+----------+------------+--------+
You can also expose your instance's frontend port on your local machine:
$ kubectl port-forward services/temporaltest-frontend-headless 7233:7233
Forwarding from 127.0.0.1:7233 -> 7233
Forwarding from [::1]:7233 -> 7233
and, from a separate window, use the local port to access the service from your application or Temporal samples.
Similarly to how you accessed the Temporal frontend via Kubernetes port forwarding, you can access your Temporal instance's web user interface.
To do so, forward your machine's local port to the Web service in your Temporal installation:
$ kubectl port-forward services/temporaltest-web 8080:8080
Forwarding from 127.0.0.1:8080 -> 8080
Forwarding from [::1]:8080 -> 8080
and navigate to http://127.0.0.1:8080 in your browser.
By default, the full "Batteries Included" configuration comes with a few Grafana dashboards.
To access those dashboards, follow the following steps:
- Extract Grafana's
adminpassword from your installation:
$ kubectl get secret --namespace default temporaltest-grafana -o jsonpath="{.data.admin-password}" | base64 --decode
t7EqZQpiB6BztZV321dEDppXbeisdpiEAMgnu6yy%
- Set up port forwarding, so you can access Grafana from your host:
$ kubectl port-forward services/temporaltest-grafana 8081:80
Forwarding from 127.0.0.1:8081 -> 3000
Forwarding from [::1]:8081 -> 3000
...
- Navigate to the forwarded Grafana port in your browser (http://localhost:8081/), login as
admin(using the password from step 1), and click on the "Home" button (upper left corner) to see available dashboards.
By default dynamic config is empty, if you want to override some properties for your cluster, you should:
- Create a yaml file with your config (for example dc.yaml).
- Populate it with some values under server.dynamicConfig prefix (use the sample provided at
values/values.dynamic_config.yamlas a starting point) - Install your helm configuration:
helm install --repo https://go.temporal.io/helm-charts -f values/values.dynamic_config.yaml temporaltest temporal --timeout 900sNote that if you already have a running cluster you can use the "helm upgrade" command to change dynamic config values:
helm upgrade --repo https://go.temporal.io/helm-charts -f values/values.dynamic_config.yaml temporaltest temporal --timeout 900sWARNING: The "helm upgrade" approach will trigger a rolling upgrade of all the pods.
If a rolling upgrade is not desirable, you can also generate the ConfigMap file explicitly and then apply it using the following command:
kubectl apply -f dynamicconfigmap.yamlYou can use helm upgrade with the "--dry-run" option to generate the content for the dynamicconfigmap.yaml.
The dynamic-config ConfigMap is referenced as a mounted volume within the Temporal Containers, so any applied change will be automatically picked up by all pods within a few minutes without the need for pod recycling. See k8S documentation (https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#mounted-configmaps-are-updated-automatically) for more details on how this works.
The default web UI configuration is shown here (https://docs.temporal.io/references/web-ui-configuration). To override the default config, you need to provide environment variables in web.additionalEnv in the values.yml file. You can refer to the available environment variables here (https://docs.temporal.io/references/web-ui-environment-variables).
For example, to serve the UI from a subpath:
web:
additionalEnv:
- name: TEMPORAL_UI_PUBLIC_PATH
value: /custom-path
Note: in this example chart, uninstalling a Temporal instance also removes all the data that might have been created during its lifetime.
helm uninstall temporaltestTo upgrade your cluster, upgrade your database schema (if the release includes schema changes), and then use helm upgrade command to perform a rolling upgrade of your installation.
Note:
- Not supported: running newer binaries with an older schema.
- Supported: downgrading binaries – running older binaries with a newer schema.
Example:
Here are examples of commands you can use to upgrade the "default" schema in your "bring your own" Cassandra database.
Upgrade default schema:
temporal-cassandra-tool \
--tls \
--tls-ca-file ... \
--user cassandra-user \
--password cassandra-password \
--endpoint cassandra.example.com \
--keyspace temporal \
--timeout 120 \
update \
--schema-dir ./schema/cassandra/temporal/versionedTo upgrade a MySQL or PostgreSQL database, use temporal-sql-tool tool instead of temporal-cassandra-tool.
Here is an example of a helm upgrade command that can be used to upgrade a cluster:
helm upgrade \
--repo https://go.temporal.io/helm-charts \
-f values/values.cassandra.yaml \
-f values/values.elasticsearch.yaml \
--set elasticsearch.enabled=true \
--set server.replicaCount=8 \
--set server.config.persistence.default.cassandra.hosts='{c1.example.com,c2.example.com,c3.example.com}' \
--set server.config.persistence.default.cassandra.user=cassandra-user \
--set server.config.persistence.default.cassandra.password=cassandra-password \
--set server.config.persistence.default.cassandra.tls.caData=... \
--set server.config.persistence.default.cassandra.tls.enabled=true \
--set server.config.persistence.default.cassandra.replicationFactor=3 \
--set server.config.persistence.default.cassandra.keyspace=temporal \
--set server.image.tag=1.24.1 \
--set server.image.repository=temporalio/server \
--set admintools.image.tag=1.24.1-tctl-1.18.1-cli-0.12.0 \
--set admintools.image.repository=temporalio/admin-tools \
--set web.image.tag=2.27.2 \
--set web.image.repository=temporalio/web \
temporaltest temporal \
--wait \
--timeout 15mPlease see our CONTRIBUTING guide.
Many thanks to Banzai Cloud whose Cadence Helm Charts heavily inspired this work.
