8.9. Explanation of Settings and Controls in the New Host and Edit Host Windows

⁠8.9.1. Host General Settings Explained

These settings apply when editing the details of a host or adding new Red Hat Enterprise Linux hosts and Foreman host provider hosts.

The General settings table contains the information required on the General tab of the New Host or Edit Host window.

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Table 8.2. General settings

Field Name	Description
Data Center	The data center to which the host belongs. Red Hat Enterprise Virtualization Hypervisor hosts cannot be added to Gluster-enabled clusters.
Host Cluster	The cluster to which the host belongs.
Use Foreman Hosts Providers	Select or clear this check box to view or hide options for adding hosts provided by Foreman hosts providers. The following options are also available: Discovered Hosts Discovered Hosts - A drop-down list that is populated with the name of Foreman hosts discovered by the engine. Host Groups -A drop-down list of host groups available. Compute Resources - A drop-down list of hypervisors to provide compute resources. Provisioned Hosts Providers Hosts - A drop-down list that is populated with the name of hosts provided by the selected external provider. The entries in this list are filtered in accordance with any search queries that have been input in the Provider search filter. Provider search filter - A text field that allows you to search for hosts provided by the selected external provider. This option is provider-specific; see provider documentation for details on forming search queries for specific providers. Leave this field blank to view all available hosts.
Name	The name of the cluster. This text field has a 40-character limit and must be a unique name with any combination of uppercase and lowercase letters, numbers, hyphens, and underscores.
Comment	A field for adding plain text, human-readable comments regarding the host.
Address	The IP address, or resolvable hostname of the host.
Password	The password of the host's root user. This can only be given when you add the host; it cannot be edited afterwards.
SSH PublicKey	Copy the contents in the text box to the `/root/.known_hosts` file on the host to use the Manager's ssh key instead of using a password to authenticate with the host.
Automatically configure host firewall	When adding a new host, the Manager can open the required ports on the host's firewall. This is enabled by default. This is an Advanced Parameter.
Use JSON protocol	This is enabled by default. This is an Advanced Parameter.
SSH Fingerprint	You can fetch the host's SSH fingerprint, and compare it with the fingerprint you expect the host to return, ensuring that they match. This is an Advanced Parameter.

⁠8.9.2. Host Power Management Settings Explained

The Power Management settings table contains the information required on the Power Management tab of the New Host or Edit Host windows.

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Table 8.3. Power Management Settings

Field Name	Description
Kdump integration	Prevents the host from fencing while performing a kernel crash dump, so that the crash dump is not interrupted. Kdump is available by default on new Red Hat Enterprise Linux 6.6 and 7.1 hosts and Hypervisors. If kdump is available on the host, but its configuration is not valid (the kdump service cannot be started), enabling Kdump integration will cause the host (re)installation to fail. If this is the case, see fence_kdump Advanced Configuration in the Red Hat Enterprise Virtualization Administration Guide.
Primary/ Secondary	Prior to Red Hat Enterprise Virtualization 3.2, a host with power management configured only recognized one fencing agent. Fencing agents configured on version 3.1 and earlier, and single agents, are treated as primary agents. The secondary option is valid when a second agent is defined.
Concurrent	Valid when there are two fencing agents, for example for dual power hosts in which each power switch has two agents connected to the same power switch. If this check box is selected, both fencing agents are used concurrently when a host is fenced. This means that both fencing agents have to respond to the Stop command for the host to be stopped; if one agent responds to the Start command, the host will go up. If this check box is not selected, the fencing agents are used sequentially. This means that to stop or start a host, the primary agent is used first, and if it fails, the secondary agent is used.
Address	The address to access your host's power management device. Either a resolvable hostname or an IP address.
User Name	User account with which to access the power management device. You can set up a user on the device, or use the default user.
Password	Password for the user accessing the power management device.
Type	The type of power management device in your host. Choose one of the following: apc - APC MasterSwitch network power switch. Not for use with APC 5.x power switch devices. apc_snmp - Use with APC 5.x power switch devices. bladecenter - IBM Bladecenter Remote Supervisor Adapter. cisco_ucs - Cisco Unified Computing System. drac5 - Dell Remote Access Controller for Dell computers. drac7 - Dell Remote Access Controller for Dell computers. eps - ePowerSwitch 8M+ network power switch. hpblade - HP BladeSystem. ilo, ilo2, ilo3, ilo4 - HP Integrated Lights-Out. ipmilan - Intelligent Platform Management Interface and Sun Integrated Lights Out Management devices. rsa - IBM Remote Supervisor Adapter. rsb - Fujitsu-Siemens RSB management interface. wti - WTI Network Power Switch.
Port	The port number used by the power management device to communicate with the host.
Options	Power management device specific options. Enter these as 'key=value' or 'key'. See the documentation of your host's power management device for the options available. For Red Hat Enterprise Linux 7 hosts, if you are using cisco_ucs as the power management device, you also need to append `ssl_insecure=1` to the Options field.
Secure	Select this check box to allow the power management device to connect securely to the host. This can be done via ssh, ssl, or other authentication protocols depending on and supported by the power management agent.
Source	Specifies whether the host will search within its cluster or data center for a fencing proxy. Use the Up and Down buttons to change the sequence in which the resources are used.
Disable policy control of power management	Power management is controlled by the Cluster Policy of the host's cluster. If power management is enabled and the defined low utilization value is reached, the Manager will power down the host machine, and restart it again when load balancing requires or there are not enough free hosts in the cluster. Select this check box to disable policy control.

⁠8.9.3. SPM Priority Settings Explained

The SPM settings table details the information required on the SPM tab of the New Host or Edit Host window.

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Table 8.4. SPM settings

Field Name	Description
SPM Priority	Defines the likelihood that the host will be given the role of Storage Pool Manager (SPM). The options are Low, Normal, and High priority. Low priority means that there is a reduced likelihood of the host being assigned the role of SPM, and High priority means there is an increased likelihood. The default setting is Normal.

⁠8.9.4. Host Console Settings Explained

The Console settings table details the information required on the Console tab of the New Host or Edit Host window.

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Table 8.5. Console settings

Field Name	Description
Override display address	Select this check box to override the display addresses of the host. This feature is useful in a case where the hosts are defined by internal IP and are behind a NAT firewall. When a user connects to a virtual machine from outside of the internal network, instead of returning the private address of the host on which the virtual machine is running, the machine returns a public IP or FQDN (which is resolved in the external network to the public IP).
Display address	The display address specified here will be used for all virtual machines running on this host. The address must be in the format of a fully qualified domain name or IP.

Field Name

Description

Override display address

Select this check box to override the display addresses of the host. This feature is useful in a case where the hosts are defined by internal IP and are behind a NAT firewall. When a user connects to a virtual machine from outside of the internal network, instead of returning the private address of the host on which the virtual machine is running, the machine returns a public IP or FQDN (which is resolved in the external network to the public IP).

Display address

The display address specified here will be used for all virtual machines running on this host. The address must be in the format of a fully qualified domain name or IP.