Question
I am trying to create a Helm Chart with the following resources:
- Secret
- ConfigMap
- Service
- Job
- Deployment
These are also in the order that I would like them to be deployed. I have put a hook in the Deployment so that it is post-install, but then Helm does not see it as a resource and I have to manually manage it.
The Job needs the information in the Secret and ConfigMap, otherwise I would make that a pre-install hook. But I can't make everything a hook or nothing will be managed in my release.
Does anyone have a solution or idea to be able to manage all of the resources within the Helm release AND make sure the Job finishes before the Deployment begins?
My only thought right now is two make two Charts: One with 1-4 and the second with 5 which would depend on the first.
Answer
Helm collects all of the resources in a given Chart and it's dependencies, groups them by resource type, and then installs them in the following order (see here - Helm 2.10):
- Namespace
- ResourceQuota
- LimitRange
- PodSecurityPolicy
- Secret
- ConfigMap
- StorageClass
- PersistentVolume
- PersistentVolumeClaim
- ServiceAccount
- CustomResourceDefinition
- ClusterRole
- ClusterRoleBinding
- Role
- RoleBinding
- Service
- DaemonSet
- Pod
- ReplicationController
- ReplicaSet
- Deployment
- StatefulSet
- Job
- CronJob
- Ingress
- APIService
During uninstallation of a release, the order is reversed (see here).
Following this logic, in your case when your Job resource is created, both the Secret and the ConfigMap will already be applied, but Helm won't wait for the Job to complete before applying the Deployment. If you split your Chart to two parts (1-4, 5) and install them sequentially you would still have the problem of the Deployment being possibly applied before the Job is completed. What I would suggest is splitting your Chart to two parts (1-3, 4-5), in which the the Job has a pre-install hook, which would make sure it completes before your Deployment is applied.
