Harvester is an open source hyper-converged infrastructure (HCI) software built on Kubernetes. It is an open alternative to using a proprietary HCI stack that incorporates the design and ethos of Cloud Native Computing.
Harvester implements HCI on bare metal servers. Harvester is designed to use local, direct attached storage instead of complex external SANs. It ships as an integrated bootable appliance image that can be deployed directly to servers through an ISO or PXE boot artifact.
Some notable features of Harvester include the following:
- VM lifecycle management including SSH-Key injection, cloud-init, and graphic and serial port console
- VM live migration support
- Supported VM backup, snapshot and restore
- Distributed block storage and storage tiering
- Multiple network interface controllers (NICs) in the VM connecting to the management network or VLANs
- Virtual Machine and cloud-init templates
- Rancher integration with multi-cluster management and the Harvester node driver
- PXE/iPXE boot support
- Virtual IP and bond NIC support
- Monitoring and logging integration
The following diagram outlines a high-level architecture of Harvester:
- Longhorn is a lightweight, reliable, and easy-to-use distributed block storage system for Kubernetes.
- KubeVirt is a virtual machine management add-on for Kubernetes.
- Elemental for SLE-Micro 5.2 (based on openSUSE Leap 15.3 before v1.0.3) is an immutable Linux distribution designed to remove as much OS maintenance as possible in a Kubernetes cluster.
To get the Harvester server up and running the following minimum hardware is required:
| Type | Requirements |
|---|---|
| CPU | x86_64 only. Hardware-assisted virtualization is required. 8-core processor minimum for testing; 16-core or above preferred for production |
| Memory | 32 GB minimum; 64 GB or above preferred |
| Disk Capacity | 200 GB minimum for testing; 500 GB or above preferred for production |
| Disk Performance | 5,000+ random IOPS per disk (SSD/NVMe). Management nodes (first three nodes) must be fast enough for etcd |
| Network Card | 1 Gbps Ethernet minimum for testing; 10Gbps Ethernet recommended for production |
| Network Switch | Trunking of ports required for VLAN support |
We recommend server-class hardware for best results. Laptops and nested virtualization are not officially supported.
You can use the ISO to install Harvester directly on the bare-metal server to form a Harvester cluster. Users can add one or many compute nodes to join the existing cluster.
To get the Harvester ISO, download it from the Github releases.
During the installation, you can either choose to form a new cluster, or join the node to an existing cluster.
- Mount the Harvester ISO disk and boot the server by selecting the
Harvester Installer.
- Choose the installation mode by either creating a new Harvester cluster, or by joining an existing one.
- Choose the installation device on which the Harvester will be installed to.
- Recommended choosing a separate disk for storing VM data.
- Configure the hostname and select the network interface for the management network. By default, Harvester will create a bonded NIC named
mgmt-bo, and the IP address can either be configured via DHCP or a static method.
- (Optional) Configure the DNS servers. Use commas as a delimiter.
- Configure the
Virtual IPwhich you can use to access the cluster or join the other nodes to the cluster. - Configure the
cluster token. This token will be used for adding other nodes to the cluster. - Configure the login password of the host. The default SSH user is
rancher. - Recommended configuring the NTP server to make sure all nodes' times are synchronized. This defaults to
0.suse.pool.ntp.org. - (Optional) If you need to use an HTTP proxy to access the outside world, enter the proxy URL address here. Otherwise, leave this blank.
- (Optional) You can choose to import SSH keys from a remote URL server. Your GitHub public keys can be used with
https://github.com/<username>.keys. - (Optional) If you need to customize the host with a cloud-init config, enter the HTTP URL here.
- After confirming the installation options, Harvester will be installed to your host. The installation may take a few minutes to be complete.
- Once the installation is complete, it will restart the host. After the restart, the Harvester console containing the management URL and status will be displayed. You can Use
F12to switch between the Harvester console and the Shell. - The default URL of the web interface is
https://your-virtual-ip.
- You will be prompted to set the password for the default
adminuser when logging in for the first time.
Find more documentation here.
Check out this demo to get a quick overview of the Harvester UI.
Harvester is 100% open-source software. The project source code is spread across a number of repos:
| Name | Repo Address |
|---|---|
| Harvester | https://github.com/harvester/harvester |
| Harvester Dashboard | https://github.com/harvester/dashboard |
| Harvester Installer | https://github.com/harvester/harvester-installer |
| Harvester Terraform Provider | https://github.com/harvester/terraform-provider-harvester |
| Harvester Cloud Provider | https://github.com/harvester/cloud-provider-harvester |
| Harvester Load Balancer | https://github.com/harvester/load-balancer-harvester |
| Harvester Network Controller | https://github.com/harvester/harvester-network-controller |
| Harvester CSI Driver | https://github.com/harvester/harvester-csi-driver |
If you need any help with Harvester, please join us at either our Slack #harvester channel or forums where most of our team hangs out at.
If you have any feedback or questions, feel free to file an issue.
Copyright (c) 2022 Rancher Labs, Inc.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.