Off The Shelf Application

Workflow for off the shelf applications

In this workflow, all files are owned by the user and maintained in a repository under their control, but they are based on an off-the-shelf configuration that is periodically consulted for updates.

Following are the steps involved:

1. Find and fork an OTS config

2. Clone it as your base

   The base directory is maintained in a repo whose upstream is an OTS configuration, in this case some user’s ldap repo:

   mkdir ~/ldap
   git clone https://github.com/$USER/ldap ~/ldap/base
   cd ~/ldap/base
   git remote add upstream git@github.com:$USER/ldap

3. Create overlays

   As in the bespoke case above, create and populate an overlays directory.

   The overlays are siblings to each other and to the base they depend on.

   mkdir -p ~/ldap/overlays/staging
   mkdir -p ~/ldap/overlays/production

   The user can maintain the overlays directory in a distinct repository.

4. Bring up variants

   kustomize build ~/ldap/overlays/staging | kubectl apply -f -
   kustomize build ~/ldap/overlays/production | kubectl apply -f -

   You can also use kubectl-v1.14.0 to apply your variants.

   kubectl apply -k ~/ldap/overlays/staging
   kubectl apply -k ~/ldap/overlays/production

5. (Optionally) Capture changes from upstream

   The user can periodically rebase their base to capture changes made in the upstream repository.

   cd ~/ldap/base
   git fetch upstream
   git rebase upstream/master