This topic explains how to update Concourse component VM stemcells separately from updating Concourse itself.
The preferred stemcell version for Concourse v6.7.x is Ubuntu Xenial 621.x.
!!! info "You can check your stemcell versions by running the command
Download the latest Xenial 621.x stemcell for your IaaS as follows:
Upload the stemcell to the BOSH director by running the the following command:
bosh upload-stemcell PATH-TO-FILE
PATH-TO-FILE is the local path to the stemcell you downloaded.
Edit your Concourse manifest
cluster/concourse.yml to target the stemcell version that you downloaded. By default, the Concourse manifest targets the
latest stemcell as follows:
... stemcells: - alias: xenial os: ubuntu-xenial version: latest ...
To target a specific stemcell version, modify the
version: setting as follows:
... stemcells: - alias: xenial os: ubuntu-xenial version: TARGET-VERSION ...
TARGET-VERSION is the version number of the uploaded stemcell, without quotes. For example,
Trigger an update by running your Concourse deploy script.
After Concourse has re-deployed, all Concourse VMs should be running the new stemcell version.