Chapter 7. Installing Additional Hosts to a Self-Hosted Environment
Additional self-hosted engine nodes are added in the same way as a regular host, with an additional step to deploy the host as a self-hosted engine node. The shared storage domain is automatically detected and the node can be used as a failover host to host the Manager virtual machine when required. You can also attach regular hosts to a self-hosted engine environment, but they cannot host the Manager virtual machine. Red Hat highly recommends having at least two self-hosted engine nodes to ensure the Manager virtual machine is highly available. Additional hosts can also be added using the REST API. See Hosts in the REST API Guide.
- For a RHEL-based self-hosted engine environment, you must have prepared a freshly installed Red Hat Enterprise Linux system on a physical host, and subscribed the host to the required entitlements. See Subscribing to the Required Entitlements in the Installation Guide for more information on subscriptions.
- For a RHVH-based self-hosted engine environment, you must have prepared a freshly installed Red Hat Virtualization Host system on a physical host. See Red Hat Virtualization Hosts in the Installation Guide.
- If you are reusing a self-hosted engine node, remove its existing self-hosted engine configuration. See Section 5.2, “Removing a Host from a Self-Hosted Engine Environment”.
Procedure 7.1. Adding an Additional Self-Hosted Engine Node
- In the Administration Portal, click the Hosts resource tab.
- Click New.For information on additional host settings, see Explanation of Settings and Controls in the New Host and Edit Host Windows in the Administration Guide.
- Use the drop-down list to select the Data Center and Host Cluster for the new host.
- Enter the Name and the Address of the new host. The standard SSH port, port 22, is auto-filled in the SSH Port field.
- Select an authentication method to use for the Manager to access the host.
- Enter the root user's password to use password authentication.
- Alternatively, copy the key displayed in the SSH PublicKey field to
/root/.ssh/authorized_keyson the host to use public key authentication.
- Optionally, configure power management, where the host has a supported power management card. For information on power management configuration, see Host Power Management Settings Explained in the Administration Guide.
- Click the Hosted Engine sub-tab.
- Select the Deploy radio button.
- Click OK.