Extending Trellis to four environments

What is the correct process for adding a fourth environment to our Trellis setup?

The goal is to have the following:

  1. Development
  2. QA/RC (this is the new step, of course)
  3. Staging
  4. Production

The new QA/RC environment is remote, but should include dev-specific requirements (like require-dev from composer).

I started drafting this repsonse on my dev machine but had to switch to my phone so I couldn’t test the result. I figured I’d share this to at least point you in a good direction. Perhaps someone could swoop in and confirm this correct.

For provisioning your new environment, the server setup will be the same as the other two remotes (stating and production). The procedure needs to be different for the application deploy. Here are the full steps of what you need to do:

  1. Duplicate and rename the files or directories for either of remote environments within group_vars and hosts, then fill in the relevant information for your new environment.
  2. Make a copy of trellis/roles/deploy/hooks/build-after.yml in trellis/deploy-hooks.
  3. For your new copy of the build-after hook, you will need to modify the final task — “Install Composer dependencies” — to reflect the following change:
 - name: Install Composer dependencies
+    no_dev: {{ 'no' if env is 'qa' else 'yes' }}
     no_scripts: yes
     working_dir: "{{ deploy_helper.new_release_path }}"

That assumes you’re new environment is called qa but feel free to change it to whatever you’d like.


Thank you so much!

I’m a little lost on steps 2 and 3:

  • The paths you specified are a little different from what I’m seeing, and…
  • I’m a little confused about whether step 3 applies to the build-after.yml that’s already in place, or to a copy I should be making in step 2.

Thanks again for your detailed support!

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Oops. I made a typo in the path for step 2. I’ll update my original post so it’s more clear. For step 3 you would need to modify the copy — I’ll clarify that in my original post as well.

Thanks again for the detail. I should be able to try this out later this week.

Meanwhile, could you point me in the right direction for additional information about what’s happening here under the hood? Some sort of gentle intro for ansible/etc noobs perhaps?

(Not too gentle, though… I do need to get to building my own configs sooner rather than later…)

I don’t know of any resources off hand. From my own experience Ansible is decently easy to learn from just reading the config files. They’re all in Yaml so it’s readable by design. Just start at the top level with one of the playbooks (i.e. server.yml, dev.yml, deploy.yml, or rollback.yml) then dive into the plays/roles that they have. The deploy role is probably a great one to get started with. It includes some hooks — which is what we’re using above.

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