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8.3.3. Recreate strategy

The recreate strategy has basic rollout behavior and supports lifecycle hooks for injecting code into the deployment process.

Example recreate strategy definition

kind: Deployment
apiVersion: apps/v1
metadata:
  name: hello-openshift
# ...
spec:
# ...
  strategy:
    type: Recreate
    recreateParams:
1 

      pre: {}
2 

      mid: {}
      post: {}

1
recreateParams are optional.
2
pre, mid, and post are lifecycle hooks.

The recreate strategy:

  1. Executes any pre lifecycle hook.
  2. Scales down the previous deployment to zero.
  3. Executes any mid lifecycle hook.
  4. Scales up the new deployment.
  5. Executes any post lifecycle hook.
중요

During scale up, if the replica count of the deployment is greater than one, the first replica of the deployment will be validated for readiness before fully scaling up the deployment. If the validation of the first replica fails, the deployment will be considered a failure.

When to use a recreate deployment:

  • When you must run migrations or other data transformations before your new code starts.
  • When you do not support having new and old versions of your application code running at the same time.
  • When you want to use a RWO volume, which is not supported being shared between multiple replicas.

A recreate deployment incurs downtime because, for a brief period, no instances of your application are running. However, your old code and new code do not run at the same time.

8.3.3.1. Editing a deployment by using the Developer perspective
링크 복사

You can edit the deployment strategy, image settings, environment variables, and advanced options for your deployment by using the Developer perspective.

Prerequisites

  • You are in the Developer perspective of the web console.
  • You have created an application.

Procedure

  1. Navigate to the Topology view.
  2. Click your application to see the Details panel.
  3. In the Actions drop-down menu, select Edit Deployment to view the Edit Deployment page.

  4. You can edit the following Advanced options for your deployment:

    1. Optional: You can pause rollouts by clicking Pause rollouts, and then selecting the Pause rollouts for this deployment checkbox.

      By pausing rollouts, you can make changes to your application without triggering a rollout. You can resume rollouts at any time.

    2. Optional: Click Scaling to change the number of instances of your image by modifying the number of Replicas.
  5. Click Save.
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