Updating Stemcells for External Workers

This topic describes how to update stemcells for External Workers. These stemcells need to be updated to ensure compatibility with your version of Concourse.

Procedure

To update stemcells, do the following:

1. Open /cluster/external-worker.yml and look for the version property in the stemcells section.

   # before
   ...
   stemcells:
       ...
       version: OLD-STEMCELL-VERSION
   ...
   

2. Update the version to the recommended stemcell version for your version of Concourse.

   For example:

   # after
   ...
   stemcells:
       ...
       version: 621.23
   ...
   

   For Concourse v5.5.8, Pivotal recommends that you use 621.x for the stemcell version.

3. Run your deploy script to trigger the update.