Requirements¶
Supported frontends (orchestrators)¶
Trident supports multiple container engines and orchestrators, including:
- Kubernetes 1.11 or later (latest: 1.18)
- OpenShift 3.11, 4.2, 4.3 and 4.4
- Docker Enterprise 2.1 or 3.0
The Trident Operator is supported with these releases:
- Kubernetes 1.14 or later (latest 1.18)
- OpenShift 4.2, 4.3 and 4.4
In addition, Trident should work with any distribution of Docker or Kubernetes that uses one of the supported versions as a base, such as Rancher or Tectonic.
Supported backends (storage)¶
To use Trident, you need one or more of the following supported backends:
- FAS/AFF/Select 9.1 or later
- HCI/SolidFire Element OS 8 or later
- E/EF-Series SANtricity
- Azure NetApp Files
- Cloud Volumes ONTAP
- Cloud Volumes Service for AWS
- Cloud Volumes Service for GCP
Feature Requirements¶
Trident requires some feature gates to be enabled for certain features to work. Refer to the table shown below to determine if you need to enable feature gates, based on your version of Trident and Kubernetes.
| Feature | Trident version | Kubernetes version | Feature Gates Required? |
|---|---|---|---|
| CSI Trident | 19.07 and above | 1.131 and above | Yes for 1.131 |
| Volume Snapshots (beta) | 20.01 and above | 1.17 and above | No |
| PVC from Volume Snapshots (beta) | 20.01 and above | 1.17 and above | No |
| iSCSI PV resize | 19.10 and above | 1.16 and above | No |
| ONTAP Bidirectional CHAP | 20.04 and above | 1.11 and above | No |
| Dynamic Export Policies | 20.04 and above | 1.131 and above | Requires CSI Trident1 |
| Trident Operator | 20.04 and above | 1.14 and above | No |
CSIDriverRegistry and CSINodeInfo
for Kubernetes 1.13. Install CSI Trident on Kubernetes 1.13 using
the --csi switch when invoking tridentctl install.Check with your Kubernetes vendor to determine the appropriate procedure for enabling feature gates.
Supported host operating systems¶
By default Trident itself runs in a container, therefore it will run on any Linux worker.
However, those workers do need to be able to mount the volumes that Trident provides using the standard NFS client or iSCSI initiator, depending on the backend(s) you’re using.
These are the Linux distributions that are known to work:
- Debian 8 or later
- Ubuntu 16.04 or later
- CentOS 7.0 or later
- RHEL 7.0 or later
- CoreOS 1353.8.0 or later
- RedHat CoreOS 4.2 and 4.3
The tridentctl utility also runs on any of these distributions of Linux.
Host configuration¶
Depending on the backend(s) in use, NFS and/or iSCSI utilities must be installed on all of the workers in the cluster. See the worker preparation guide for details.
Storage system configuration¶
Trident may require some changes to a storage system before a backend configuration can use it. See the backend configuration guide for details.