Rancher Service Updater

An Inversion of Control (IOC) service used to notify Rancher of new container images and execute updates to those services based on container labels.

Configuring

AUTOUPDATE_ENABLE_LABEL [autoupdate.enable] - Specifies the container label to query for automatic update enabling.
AUTOUPDATE_ENVIRONMENT_NAMES [[".*"]] - An array of regex patterns to match Rancher environment names against. Environment name must match a pattern for auto-updating to occur in that environment.
AUTOUPDATE_HTTP_PORT [8080] - The port that the service updater listens on.
AUTOUPDATE_SLACK_WEBHOOK_URL - The webhook URL to use for sending Slack notifications. If not specified, Slack messaging is disabled.
AUTOUPDATE_SLACK_BOT_NAME - The bot name to send as for Slack messages.
CATTLE_ACCESS_KEY - The API access key for Rancher.
CATTLE_SECRET_KEY - The API secret key for Rancher.
CATTLE_URL - The Rancher server URL.

Enabling Auto-Updating for Rancher Environment

The Rancher Service Updater configures itself to only check certain environments for services to automatically update. This is done in conjunction with the API restrictions based on the credentials passed to the container. That is, if an environment specific key is used, then the updater will only ever try to update service within that environment.

If however, a global/user key is used, then the updater can update services in any environment that that key has access to. By default the updater is configured to allow updating of services in any environment. This is set via the AUTOUDPATE_ENVIRONMENT_NAMES environment variable which should contain a comma (,) separated list of regex patterns. The default value is .*.

In conjunction with a global key, this property can be used to restrict the environments. For example, assume a cluster with 3 environments: dev, qa, and production. The updater is configured with a global key that has access to all 3 environments. To restrict automatic updates to only the dev environment, set AUTOUPDATE_ENVIRONMENT_NAMES=dev. To restrict automatic updates to both the dev and qa environments, set AUTOUPDATE_ENVIRONMENT_NAMES=dev,qa

Enabling Auto-Updating for a Rancher Service

Configure a service to be automatically updated by adding a container label of autoupdate.enabled=true. Alternatively, the label to check can be specified by setting the AUTOUPDATE_ENABLE_LABEL environment variable

Determining if update is required

Currently Deployed Version	Newly Published Version	Update?
1.0	2.0	`true`
2.0	1.3	`false`
1.0	latest	`true`
latest	latest	`true`
latest	1.0	`false`

Running Service Updater on Rancher

The Rancher Service Updater relies upon the standard environment variables for providing connection information to create a Rancher client instance.

If running this application as a container on a Rancher cluster itself, you can provide the following service labels to automatically provision the API credentials to the application.

io.rancher.container.create_agent=true
io.rancher.container.agent.role=environment

NOTE: When using this method, the provisioned API credentials are tied to the Rancher environment in which the service is deployed. Thus, it will only have access to update services within that same environment.

NOTE: If it is intended to auto-update services in multiple Rancher environments, then the API configuration must be provided via environment variables.

Triggering an upgrade.

Send a post to /upgrade with the following JSON payload:

{
  "docker_image": "docker:",
  "confirm": true,
  "start_first": false,
  "timeout": 30
}

docker_image - the image path that is now available. Optionally start with docker:
confirm - if the service upgrade should be confirmed/finished if successful
start_first - Optional. Default of false. If true, then sets new services to be started before terminated old services.
timeout - Optional. Timeout in seconds. Default of 30. Timeout for waiting for service upgrade to complete if confirm = true.

Security

This service provides not mechanism for authentication/authorization. It is the responsibility of the user to properly secure this service such that unauthorized access is not available.

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