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Deployment

Head to the Deploy section of our docs site to get started.

See below for technical considerations and instructions.

Encryption

Lightning enforces encryption at rest for credentials, TOTP backup codes, and webhook trigger authentication methods, for which an encryption key must be provided when running in production.

The key is expected to be a randomized set of bytes, 32 long; and Base64 encoded when setting the environment variable.

There is a mix task that can generate keys in the correct shape for use as an environment variable:

mix lightning.gen_encryption_key
0bJ9w+hn4ebQrsCaWXuA9JY49fP9kbHmywGd5K7k+/s=

Copy your key (NOT THIS ONE) and set it as PRIMARY_ENCRYPTION_KEY in your environment.

Workers

Lightning uses external worker processes for executing Runs. There are three settings required to configure worker authentication.

  • WORKER_RUNS_PRIVATE_KEY
  • WORKER_LIGHTNING_PUBLIC_KEY
  • WORKER_SECRET

You can use the mix lightning.gen_worker_keys task to generate these for convenience.

For more information see the Workers documentation.

Environment Variables

Note that for secure deployments, it's recommended to use a combination of secrets and configMaps to generate secure environment variables.

Limits

  • WORKER_MAX_RUN_MEMORY_MB - how much memory (in MB) can a single run use?
  • RUN_GRACE_PERIOD_SECONDS - how long after the MAX_RUN_DURATION_SECONDS should the server wait for the worker to send back data on a run.
  • WORKER_MAX_RUN_DURATION_SECONDS - the maximum duration (in seconds) that workflows are allowed to run (keep this plus RUN_GRACE_PERIOD_SECONDS below your termination_grace_period if using kubernetes)
  • WORKER_CAPACITY - the number of runs a ws-worker instance will take on concurrently.
  • MAX_DATACLIP_SIZE_MB - the maximum size (in MB) of a dataclip created via the webhook trigger URL for a job. This limits the max request size via the JSON plug and may (in future) limit the size of dataclips that can be stored as run_results via the websocket connection from a worker.

Github

Lightning enables connection to github via Github Apps. The following github permissions are needed for the github app:

Resource Access
Actions Read and Write
Contents Read and Write
Metadata Read only
Secrets Read and Write
Workflows Read and Write

Ensure you set the following URLs:

  • Homepage URL: <app_url_here>
  • Callback URL for authorizing users: <app_url_here>/oauth/github/callback (Do NOT check the two checkboxes in this section requesting Device Flow and OAuth.)
  • Setup URL for Post installation: <app_url_here>/setup_vcs (Check the box for Redirect on update)

These envrionment variables will need to be set in order to configure the github app:

Variable Description
GITHUB_APP_ID the github app ID.
GITHUB_APP_NAME the github app name. This is the name used in the public link. It is the downcased name with spaces replaced with hyphens
GITHUB_APP_CLIENT_ID the github app Client ID
GITHUB_APP_CLIENT_SECRET the github app Client Secret
GITHUB_CERT the github app private key (Base 64 encoded)

You can access these from your github app settings menu. Also needed for the configuration is:

  • REPO_CONNECTION_SIGNING_SECRET - secret used to sign access tokens. This access token is used to authenticate requests made from the github actions. You can generate this using mix lightning.gen_encryption_key

Storage

Lightning can use a storage backend to store exports.

Variable Description
STORAGE_BACKEND the storage backend to use. (default is local)
STORAGE_PATH the path to store files in. (default is .)

Supported backends:

  • local - local file storage
  • gcs - Google Cloud Storage

Google Cloud Storage

For Google Cloud Storage, the following environment variables are required:

Variable Description
GCS_BUCKET the name of the bucket to store files in
GOOGLE_APPLICATION_CREDENTIALS_JSON A base64 encoded JSON keyfile for the service account with access to the bucket.

ℹ️ Note: The GOOGLE_APPLICATION_CREDENTIALS_JSON should be base64 encoded, currently Workload Identity is not supported.

Mail

Lightning can send emails for various reasons, such as password resets and alerts for failed runs.

In order to send emails, you need to set the MAIL_PROVIDER environment variable to one of the following:

  • local (the default)
  • mailgun
  • smtp

You will also want to set the EMAIL_ADMIN environment variable to the email address that will be used as the sender for system emails.

Mailgun

For mailgun, the following environment variables are required:

Variable Description
MAIL_PROVIDER Must be set to mailgun
MAILGUN_API_KEY the mail gun api key
MAILGUN_DOMAIN the mail gun domain

SMTP

For SMTP, the following environment variables are required:

Variable Description
MAIL_PROVIDER Must be set to smtp
SMTP_USERNAME Username for your server
SMTP_PASSWORD Password for the user
SMTP_RELAY IP address or hostname
SMTP_TLS Use TLS, defaults to true, options are true, false, if_available
SMTP_PORT Which port to use, defaults to 587

Other config

Variable Description
ADAPTORS_PATH Where you store your locally installed adaptors
ALLOW_SIGNUP Set to true to enable user access to the registration page. Set to false to disable new user registrations and block access to the registration page.
Default is true.
CORS_ORIGIN A list of acceptable hosts for browser/cors requests (',' separated)
DISABLE_DB_SSL In production, the use of an SSL connection to Postgres is required by default.
Setting this to "true" allows unencrypted connections to the database. This is strongly discouraged in a real production environment.
EMAIL_ADMIN This is used as the sender email address for system emails. It is also displayed in the menu as the support email.
EMAIL_SENDER_NAME This is displayed in the email client as the sender name for emails sent by the application.
IDLE_TIMEOUT The number of seconds that must pass without data being received before the Lightning web server kills the connection.
IS_RESETTABLE_DEMO If set to yes, it allows this instance to be reset to the initial "Lightning Demo" state. Note that this will destroy most of what you have in your database!
K8S_HEADLESS_SERVICE This environment variable is automatically set if you're running on GKE and it is used to establish an Erlang node cluster. Note that if you're not using Kubernetes, the "gossip" strategy is used to establish clusters.
LISTEN_ADDRESS The address the web server should bind to. Defaults to 127.0.0.1 to block access from other machines.
LOG_LEVEL How noisy you want the logs to be (e.g., debug, info)
MIX_ENV Your mix env, likely prod for deployment
NODE_ENV Node env, likely production for deployment
ORIGINS The allowed origins for web traffic to the backend
PORT The port your Phoenix app runs on
PRIMARY_ENCRYPTION_KEY A base64 encoded 32 character long string.
See Encryption.
QUEUE_RESULT_RETENTION_PERIOD_SECONDS The number of seconds to keep completed (successful) ObanJobs in the queue (not to be confused with runs and/or history)
SCHEMAS_PATH Path to the credential schemas that provide forms for different adaptors
SECRET_KEY_BASE A secret key used as a base to generate secrets for encrypting and signing data.
SENTRY_DSN If using Sentry for error monitoring, your DSN
URL_HOST The host used for writing URLs (e.g., demo.openfn.org)
URL_PORT The port, usually 443 for production
URL_SCHEME The scheme for writing URLs (e.g., https)
USAGE_TRACKER_HOST The host that receives usage tracking submissions
(defaults to https://impact.openfn.org)
USAGE_TRACKING_DAILY_BATCH_SIZE The number of days that will be reported on with each run of UsageTracking.DayWorker. This will only have a noticeable effect in cases where there is a backlog or where reports are being generated retroactively (defaults to 10).
USAGE_TRACKING_ENABLED Enables the submission of anonymized usage data to OpenFn (defaults to true)
USAGE_TRACKING_RESUBMISSION_BATCH_SIZE The number of failed reports that will be submitted on each resubmission run (defaults to 10)
USAGE_TRACKING_RUN_CHUNK_SIZE The size of each batch of runs that is streamed from the database when generating UsageTracking reports (default 100). Decreasing this may decrease memory consumption when generating reports.
USAGE_TRACKING_UUIDS Indicates whether submissions should include cleartext UUIDs or not. Options are cleartext or hashed_only, with the default being hashed_only.

AI Chat

🧪 Experimental

Lightning can be configured to use an AI chatbot for user interactions.

See openfn/apollo for more information on the Apollo AI service.

The following environment variables are required:

  • OPENAI_API_KEY - your OpenAI API key.
  • APOLLO_ENDPOINT - the endpoint for the OpenFn Apollo AI service.

Kafka Triggers

🧪 Experimental

Lightning workflows can be configured with a trigger that will consume messages from a Kafka Cluster. By default this is disabled and you will not see the option to create a Kafka trigger in the UI, nor will the Kafka consumer groups be running.

To enable this feature set the KAFKA_TRIGGERS_ENABLED environment variable to yes and restart Lightning. Please note that, if you enable this feature and then create some Kafka triggers and then disable the feature, you will not be able to edit any triggers created before the feature was disabled.

Performance Tuning

The number of Kafka consumers in the consumer group can be modified by setting the KAFKA_NUMBER_OF_CONSUMERS environment variable. The default value is currently 1. The optimal setting is one consumer per topic partition. NOTE: This setting will move to KafkaConfiguration as it will be trigger-specific.

The number of messages that the Kafka consumer will forward is rate-limited by the KAFKA_NUMBER_OF_MESSAGES_PER_SECOND environment variable. This can be set to a value of less than 1 (minimum 0.1) and will converted (and rounded-down) to an integer value of messages over a 10-second interval (e.g. 0.15 becomes 1 message every 10 seconds). The default value is 1.

Processing concurrency within the Kafka Broadway pipeline is controlled by the KAFKA_NUMBER_OF_PROCESSORS environment variable. Modifying this, modifies the number of processors that are downstream of the Kafka consumer, so an increase in this value should increase throughput (when factoring in the rate limit set by KAFKA_NUMBER_OF_MESSAGES_PER_SECOND). The default value is 1.

Deduplication

Each Kafka trigger maintains record of the topic, parition and offset for each message received. This to protect against the ingestion of duplicate messages from the cluster. These records are periodically cleaned out. The duration for which they are retained is controlled by KAFKA_DUPLICATE_TRACKING_RETENTION_SECONDS. The default value is 3600.

Disabling Kafka Triggers

After a Kafka consumer group connects to a Kafka cluster, the cluster will track the last committed offset for a given consumer group ,to ensure that the consumer group receives the correct messages.

This data is retained for a finite period. If an enabled Kafka trigger is disabled for longer than the offset retention period the consumer group offset data will be cleared.

If the Kafka trigger is re-enabled after the offset data has been cleared, this will result in the consumer group reverting to what has been configured as the 'Initial offset reset policy' for the trigger. This may result in the duplication of messages or even data loss.

It is recommended that you check the value of the offsets.retention.minutes for the Kafka cluster to determine what the cluster's retention period is, and consider this when disabling a Kafka trigger for an extended period.

Failure notifications

Under certain failure conditions, a Kafka trigger will send an email to certain user that are associated with a project. After each email an embargo is applied to ensure that Lightning does not flood the recipients with email. The length of the embargo is controlled by the KAFKA_NOTIFICATION_EMBARGO_SECONDS ENV variable.

Persisting Failed Messages

PLEASE NOTE: If alternate file storage is not enabled, messages that fail to be persisted will not be retained by Lightning ans this can result in data loss, if the Kafka cluster can not make these messages available again.

If a Kafka message files to be persisted as a WorkOrder, Run and Dataclip, the option exists to write the failed message to a location on the local file system. If this option is enabled by setting KAFKA_ALTERNATE_STORAGE_ENABLED, then the KAFKA_ALTERNATE_STORAGE_PATH ENV variable must be set to the path that exists and is writable by Lightning. The location shoudl also be suitably protected to prevent data exposure as Lightning will not encrypt the message contents when writing it.

If the option is enabled and a message fails to be persisted, Lightning will create a subdirectory named with the id if the affected trigger's workflow in the location specified by KAFKA_ALTERNATE_STORAGE_PATH (assuming such a subdirectory does not already exist). Lightning will serialise the message headers and data as received by the Kafka pipeline and write this to a file within the subdirectory. The file will be named based on the pattern <trigger_id>_<message_topic>_<message_partition>_<message_offset>.json.

To recover the persisted messages, it is suggested that the affected triggers be disabled before commencing. Once this is done, the following code needs to be run from an IEx console on each node that is running Lightning:

Lightning.KafkaTriggers.MessageRecovery.recover_messages(
  Lightning.Config.kafka_alternate_storage_file_path()
)

Further details regarding the behaviour of MessageRecovery.recover_messages/1 can be found in the module documentation of MessageRecovery. Recovered messages will have the .json extension modified to .json.recovered but they will be left in place. Future recovery runs will not process files that have been marked as recovered.

Once all files have either been recovered or discarded, the triggers can be enabled once more.

Google Oauth2

Using your Google Cloud account, provision a new OAuth 2.0 Client with the 'Web application' type.

Set the callback url to: https://<ENDPOINT DOMAIN>/authenticate/callback. Replacing ENDPOINT DOMAIN with the host name of your instance.

Once the client has been created, get/download the OAuth client JSON and set the following environment variables:

Variable Description
GOOGLE_CLIENT_ID Which is client_id from the client details.
GOOGLE_CLIENT_SECRET client_secret from the client details.

Salesforce Oauth2

Using your Salesforce developer account, create a new Oauth 2.0 connected application.

Set the callback url to: https://<ENDPOINT DOMAIN>/authenticate/callback. Replacing ENDPOINT DOMAIN with the host name of your instance.

Grant permissions as desired.

Once the client has been created set the following environment variables:

Variable Description
SALESFORCE_CLIENT_ID Which is Consumer Key from the "Manage Consumer Details" screen.
SALESFORCE_CLIENT_SECRET Which is Consumer Secret from the "Manage Consumer Details" screen.