How to access a Concourse container through the worker VM.

Products

• Concourse for VMware Tanzu

Issue/Introduction

When troubleshooting or testing Concourse, you may want to access the container where the job is running. This KB will describe how to do so.

Environment

Concourse deployed on BOSH

Resolution

1. Authenticate with the fly cli. In this example, the commands will use a target named "lab".
2. Run fly -t lab containers. This will show currently running builds, and builds that have completed recently.
3. From the list, identify the pipeline and job you wish to access. Take note of the handle and worker sections. 
   1. As an example of the output you expect: 

      handle	worker	pipeline	job	build #	build id	type	name	attempt
      08d100a3-f7d3-46ee-6375-12391ac4632c	87f2f59f-768e-4237-9d19-ee7cd0cef0a8	slot1-lab27	install-healthwatch-pas-exporter	1	7026030	task	download-product-stemcell	n/a

       

4. From the output, you'll need to ssh to the worker that has the container running. In the above example, we'll run bosh -d <concourse> ssh worker/87f2f59f-768e-4237-9d19-ee7cd0cef0a9
5. sudo -i
6. From the worker, run the following command to access the container: /var/gdn/assets/linux/bin/runc exec -t 08d100a3-f7d3-46ee-6375-12391ac4632c  /bin/bash
7. From here, you can run whichever tests you need to, or check the files that are being used in the containers.