Running a DSE configuration job using LCM

Run a configuration job that pushes DSE configuration profile updates at the cluster, datacenter, or node level in Lifecycle Manager.

Synchronizing a managed cluster, datacenter, or node pushes a configuration profile or updates to configuration profiles to designated targets. When Lifecycle Manager pushes its version of a configuration, it overwrites any configuration changes that were not made within Lifecycle Manager. Running a configure job realigns configuration and ensures uniform configuration.

Note: If the version of DataStax Enterprise associated with a configuration profile being pushed differs from the installed version, the configuration job fails. To upgrade to a minor DSE version, clone the configuration profile and run an upgrade job. Version downgrades of DSE are not supported within Lifecycle Manager.

Lifecycle Manager runs jobs concurrently for different clusters; however, jobs for the same cluster execute sequentially and remain in the pending state while other jobs are currently running.

Lifecycle Manager pushes configuration jobs to a single node at a time and restarts DataStax Enterprise on that node. For a newly added cluster, the very first install job runs on several concurrent nodes. The concurrency speeds the initial install process and is safe because the new cluster cannot serve clients until it has been installed for the first time. After that, install and configure jobs proceed one-node-at-a-time to ensure cluster availability. The job does not progress to the next node until the current node successfully restarts (that is, the node is responding on the native_transport_port). By default, the job gracefully stops prematurely if a job fails for a single node. Jobs that are already running on nodes are allowed to finish, but the job does not continue running on any remaining nodes for that job. Doing so prevents any potential configuration problems from bringing down multiple nodes, or even the entire cluster. If required, override this default behavior with the Continue on error option, which attempts to continue running the job on all nodes regardless of failure.

Prerequisites

  1. Create all credentials, both SSH and repositories.
  2. Define configuration profiles.
  3. Build the cluster topology model or import an existing model.
  4. Run an installation job for the initial installation of DSE.
    Note: If importing an existing cluster into LCM, run an install job after the import. A configuration job fails if an install job has not preceded the configuration job.

Procedure

  1. Click Clusters in the Lifecycle Manager navigation menu.
  2. Select the cluster, datacenter, or node to run a configuration for.
  3. Click Configure from the drop menu.
    The Run Configuration Job dialog appears.

    Run Config (DSE) job dialog in LCM

  4. To override the default error behavior and continue running the job on subsequent nodes until all nodes are finished, select Continue on error. The job continues running despite encountering errors.
    By default, a job ceases running on additional nodes upon encountering an error on any given node. Any nodes that are already running continue to completion.
  5. Optional: Enter a description about the job.
  6. If running a configuration job on a cluster or datacenter, select a Concurrency Level:
    Note: Concurrency Level is not applicable to node-level jobs.
    • Automatic (safest but not always fastest): Default. Lets LCM determine a safe concurrency level to use. Use this option when unsure which other option would be appropriate.
      Note: The Automatic option behaves similarly to the Single node option for nodes in datacenters that have previously been installed by LCM. For nodes in new datacenters where an install job has not yet been successfully completed, the Automatic strategy behaves similarly to the All nodes options, which are presumed to be safe options because nodes in a datacenter that has not yet finished being installed should not yet be servicing requests.
    • Single node: Executes job on one node at a time. Use this option when having more than one node offline at a given time would impact availability.
    • One node per DC: Executes job concurrently on at most one node per DC. Use this option if having a single node in each DC offline does not impact availability.
    • Single rack within a DC (might interrupt service): Executes job concurrently on nodes such that at most one rack has nodes down at a time. Use this option if having an entire rack within a DC offline does not impact availability.
    • One rack per DC (might interrupt service): Executes job concurrently on nodes such that at most one rack in each DC has nodes down at a time. Use this option if having an entire rack in each DC offline does not impact availability.
    • All nodes within a DC (interrupts service): Executes job concurrently on all nodes in a DC. Use this option if having all nodes in a DC offline is acceptable.
    • All nodes (interrupts service): Executes a job concurrently on all nodes in a cluster. Use this option if having all nodes in a cluster offline is acceptable.
  7. If running a configuration job on a cluster or datacenter, enter a Batch Size if the default (10) is not appropriate for your environment.
    Note: Batch size takes effect only when a large number of nodes are eligible for concurrent deployment, such as with the All nodes concurrency policies. Batch size has no effect on jobs with the single-node concurrency policy or on node-level jobs.
  8. Click Submit.
    The job is submitted. A dialog informs you the job is in the queue to run.
  9. Click View Job Summary to navigate quickly to the Jobs page to monitor the job progress. Click Close if you do not want to immediately monitor the job and prefer to remain in the Clusters workspace.