Helm Charts are a set of Kubernetes manifests that reflect best practices to deploy an application or service. Helm is heavily influenced by Homebrew, including the formula model. A Helm chart is to Helm as a Formula is to Homebrew.
When you run helmc fetch deis/workflow-v2.1.0, you can customize the chart with
helmc edit workflow-v2.1.0. To customize the respective component, edit
manifests/deis-<component>-rc.yaml and modify the env section of the component to tune these
settings.
For example, to allow only administrators to register new accounts in the controller,
edit manifests/deis-controller-rc.yaml and add the following under the env section:
env:
- name: REGISTRATION_MODE
value: "admin_only"
The following environment variables are tunable for the Controller component:
| Setting | Description |
|---|---|
| REGISTRATION_MODE | set registration to "enabled", "disabled", or "admin_only" (default: "enabled") |
| GUNICORN_WORKERS | number of gunicorn workers spawned to process requests (default: CPU cores * 4 + 1) |
| DEIS_RESERVED_NAMES | a comma-separated list of names which applications cannot reserve for routing (default: "deis") |
The following environment variables are tunable for the Database component:
| Setting | Description |
|---|---|
| BACKUP_FREQUENCY | how ofter the database should perform a base backup (default: "12h") |
| BACKUPS_TO_RETAIN | number of base backups the backing store should retain (default: 5) |