Prerequisites¶

The following key components must be in place before you can install MSR on Kubernetes using the online method:

cert-manager
Postgres Operator
RethinkDB Operator
MSR Operator

To ensure that all of the key prerequisites are present:

Install cert-manager:

Important

The cert-manager version must be 1.7.2 or later.

helm upgrade --install cert-manager cert-manager \
     --repo https://charts.jetstack.io \
     --version 1.12.3 \
     --set installCRDs=true

Install Postgres Operator:

Important

The Postgres Operator version you install must be 1.9.0 or later, as all versions up through 1.8.2 use the PodDisruptionBudget policy/v1beta1 Kubernetes API, which is no longer served as of Kubernetes 1.25. This being the case, various MSR features may not function properly if a Postgres Operator prior to 1.9.0 is installed alongside MSR on Kubernetes 1.25 or later.
```
helm upgrade --install postgres-operator postgres-operator \
     --repo https://opensource.zalando.com/postgres-operator/charts/postgres-operator/ \
     --version 1.10.0 \
     --set configKubernetes.spilo_runasuser=101 \
     --set configKubernetes.spilo_runasgroup=103 \
     --set configKubernetes.spilo_fsgroup=103
```
Note

By default, MSR uses the persistent volume claims detailed in Volumes.

If you have a pre-existing PersistentVolume that contains image blob data that you intend to use with a new instance of MSR, you can add the following to the MSR custom resource manifest to provide the new instance with the name of the associated PersistentVolumeClaim:
```
spec:
  registry:
    storage:
      backend: 'persistentVolume'
      persistentVolume:
        existingClaim: '<pre-existing-msr-pvc>'
```
This setting indicates the <release-name> PVC referred to in volumes.

Install RethinkDB Operator:

helm upgrade --install rethinkdb-operator rethinkdb-operator \
     --repo https://registry.mirantis.com/charts/rethinkdb/rethinkdb-operator \
     --version 1.0.0

Install MSR Operator:

helm upgrade --install msr-operator msr-operator \
     --repo https://registry.mirantis.com/charts/msr/msr-operator \
     --version 1.0.0