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deployment_groups.md

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Deployment Groups

A deployment group is a set of hosts with configuration and state on the masters that helps you deploy Helios jobs to agents more easily. It determines the list and sequence of hosts to deploy, undeploys prior jobs it has deployed, and deploys the specified job.

See the original proposal here for background and motivation.

Usage

Create

A host selector is an expression of the form [label] [operator] [operand]. Host selectors are used by deployment groups to choose which hosts to act on. The command below will create a deployment group whose hosts match all the specified host selectors.

$ helios create-deployment-group foo-group foo=bar baz=qux

Creating deployment group: {"labels":{"baz":"qux","foo":"bar"},"name":"foo-group"}
{"status":"CREATED"}

Here's a list of the available types of host selectors:

  • [label] = foo
  • [label] != foo
  • [label] in (foo, bar, qux, ...)
  • [label] notin (foo, bar, qux, ...)

Creating a deployment group with the same name and labels as an existing one will succeed with a "not modified" response. Creating a deployment group with the same name but different labels as an existing one will return an error stating that the deployment group already exists.

Updating the definition

To change the definition of a deployment group, such as adding/removing host selectors, you will need to remove the group, create it again with the same name and new host selectors, and then run rolling-update --migrate again.

Inspect

Inspect the deployment group:

$ helios inspect-deployment-group foo-group

Name: foo-group
Labels: baz=qux
        foo=bar
Job:

List

List deployment groups:

$ helios list-deployment-groups

foo-group

Rolling Update

Tell the deployment group to deploy job foo:0.1.0 to all its agents.

$ helios rolling-update foo:0.1.0 foo-group

Rolling update started: foo-group -> foo:0.1.0 (parallelism=1, timeout=300)

host1 -> RUNNING (1/3)
host2 -> RUNNING (2/3)
host3 -> RUNNING (3/3)

Done.
Duration: 4.00 s

This command makes a deployment request and blocks until the update is complete. Helios determines the list and sequence of agents, undeploys any prior jobs this deployment group had deployed, and deploys the new job. If the job fails to reach the RUNNING state on any agent, the rolling update is stopped and marked as FAILED.

If the update succeeds it is marked as ACTIVE. Helios will periodically recalculate the list of agents that match the deployment group labels and make sure they are all running the specified job. This means new agents that match the labels will automatically be told to deploy the job.

See more rolling-update options with helios rolling-update -h, e.g. parallel deployments and failure timeouts.

Overlap

If you add --overlap, the rolling-update will, for every host, first deploy the new version of a job before undeploying the old one. Note that the command will fail if the job contains static port assignments.

Status

Check on the status:

$ helios deployment-group-status foo-group

Name: foo-group
Job Id: foo-job:0.1.0
Status: ROLLING_OUT

HOST      UP-TO-DATE    JOB              STATE
host1.    X             foo-job:0.1.0    RUNNING
host2.    X             foo-job:0.1.0    PULLING_IMAGE
host3.                  -                -

See more deployment group commands with helios -h.