Chapter 14. Hosts

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14.1. Host Elements

The hosts collection provides information about the hosts in a Red Hat Enterprise Virtualization environment. An API user accesses this information through the rel="hosts" link obtained from the entry point URI.
Additional information can be retrieved for GET requests using the All-Content: true header.
The following table shows specific elements contained in a host resource representation.
Table 14.1. Host elements
Element Type Description Properties
link rel="storage" relationship A link to the storage sub-collection for host storage.
link rel="nics" relationship A link to the nics sub-collection for host network interfaces.  
link rel="numanodes" relationship A link to the numanodes sub-collection for host NUMA nodes.  
link rel="tags" relationship A link to the tags sub-collection for host tags.  
link rel="permissions" relationship A link to the permissions sub-collection for host permissions.  
link rel="statistics" relationship A link to the statistics sub-collection for host statistics.
link rel="hooks" relationship A link to the hooks sub-collection for host hooks.
link rel="fenceagents" relationship A link to the fenceagents sub-collection for host fence agents.
link rel="katelloerrata" relationship A link to the katelloerrata sub-collection for host errata.
link rel="devices" relationship A link to the devices sub-collection for host devices.
link rel="networkattachments" relationship A link to the networkattachments sub-collection for host network configuration.
link rel="unmanagednetworks" relationship A link to the unmanagednetworks sub-collection for unmanaged networks on the host.
link rel="storageconnectionextensions" relationship A link to the storageconnectionextensions sub-collection for host storage connection extensions.
name string The unique identifier for the host.  
root_password string The root password of this host, by convention only included in the client-provided host representation on creation.
comment string Any comments regarding the host.  
address string The IP address or hostname of the host.
certificate complex A reference to the host certificate details, including organization and subject.
status See below The host status.
external_status complex/enumerated The host health status as reported by external systems and plug-ins. The state element contains an enumerated value of ok, info, warning, error, or failure.  
cluster id= GUID A reference to the cluster that includes this host.  
port integer The listen port of the VDSM daemon running on this host.
type One of rhel or rhev-h The host type.
storage_manager priority= Boolean: true or false Specifies whether the host is a storage manager.
version major= minor= build= revision= full_version= complex The compatibility level of the host.
hardware_information complex Information regarding the hardware of the host, including manufacturer, version, serial_number, product_name, uuid, and family.  
power_management type= complex Configuration options for host power management, including enabled, options, kdump_detection, automatic_pm_enabled, and agents. See Section 14.4, “Power Management Elements” for more information on the host power management options.  
ksm Boolean: true or false true if Kernel SamePage Merging (KSM) is enabled.  
transparent_hugepages Boolean: true or false true if Transparent Hugepages is enabled.  
iscsi complex The SCSI initiator for the host.
ssh complex Details regarding the SSH connection with the host, including port and fingerprint.  
cpu complex Statistics for the host CPU. Includes sub-elements for the CPU's name, topology cores=, topology sockets=, topology threads= and speed. The topology cores= aggregates the total cores while the topology sockets= aggregates the total physical CPUs. The total cores available to virtual machines equals the number of sockets multiplied by the cores per socket.
memory integer The total amount of host memory in bytes.
max_scheduling_memory integer The maximum amount of memory that can be used in scheduling in bytes.
summary complex Summary statistics of the virtual machines on the host. Includes sub-elements for numbers of active, migrating and total VMs.
os type= complex Details regarding the operating system installed on the host, including version full_version=.
libvirt_version major= minor= build= revision= full_version= complex The libvirt compatibility level of the host.
The status contains one of the following enumerative values: down, error, initializing, installing, install_failed, maintenance, non_operational, non_responsive, pending_approval, preparing_for_maintenance, connecting, reboot, unassigned and up. These states are listed in host_states under capabilities.
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