Requirements¶
Supported frontends (orchestrators)¶
Trident supports multiple container engines and orchestrators, including:
- Anthos GKE On-Prem v1.5
- Docker Enterprise 2.1, 3.0, and 3.1
- Kubernetes 1.11 or later (latest: 1.20)
- OpenShift 3.11, 4.2, 4.3, 4.4, 4.5, and 4.6.8
The Trident Operator is supported with these releases:
- Anthos GKE On-Prem v1.5
- Kubernetes 1.14 or later (latest: 1.20)
- OpenShift 4.2, 4.3, 4.4, 4.5, and 4.6.8
Important
Red Hat OpenShift Container Platform users might observe their initiatorname.iscsi file to be blank if using any version below 4.6.8. This is a bug that has been identified by RedHat to be fixed with OpenShift 4.6.8. See this bug fix announcement. NetApp recommends that you use Trident 20.10 on OpenShift 4.6.8.
Trident also works with a host of other fully managed and self-managed Kubernetes offerings, including Google Cloud’s Google Kubernetes Engine (GKE), AWS’s Elastic Kubernetes Services (EKS), Azure’s Azure Kubernetes Service (AKS), and Rancher.
Supported backends (storage)¶
To use Trident, you need one or more of the following supported backends:
- Azure NetApp Files
- Cloud Volumes ONTAP
- Cloud Volumes Service for AWS
- Cloud Volumes Service for GCP
- E/EF-Series SANtricity
- FAS/AFF/Select 9.1 or later
- NetApp All SAN Array (ASA)
- NetApp HCI/Element software 8 or later
Feature requirements¶
Trident requires some feature gates to be enabled for certain features to work. See the table 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 |
| Auto Worker Node Prep (beta) | 20.10 and above | 1.131 and above | Requires CSI Trident1 |
| CSI Topology | 20.10 and above | 1.17 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
- RedHat CoreOS 4.2 and 4.3
- RHEL or CentOS 7.4 or later
- Ubuntu 18.04 or later
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.