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# 3 Hosts

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#### Overview

In the *Configuration → Hosts* section users can configure and maintain
hosts.

A listing of existing hosts with their details is displayed.

From the dropdown to the right in the *Hosts* bar you can choose whether
to display all hosts or only those belonging to one particular group.

![](../../../../../assets/en/manual/web_interface/hosts2.png){width="600"}

Displayed data:

|Column|Description|
|------|-----------|
|*Name*|Name of the host. Clicking on the host name opens the host [configuration form](/manual/config/hosts/host#configuring_a_host).|
|*Elements (Applications, Items, Triggers, Graphs, Discovery, Web)*|Clicking on the element name will display items, triggers etc. of the host. The number of the respective elements is displayed in gray.|
|*Interface*|The main interface of the host is displayed.|
|*Templates*|The templates linked to the host are displayed. If other templates are contained in the linked template, those are displayed in parentheses, separated by a comma. Clicking on a template name will open its configuration form.|
|*Status*|Host status is displayed - *Enabled* or *Disabled*. By clicking on the status you can change it.<br>An orange wrench icon ![](../../../../../assets/en/manual/web_interface/frontend_sections/configuration/maintenance_wrench_icon.png) before the host status indicates that this host is in maintenance (since Zabbix 4.0.9). Maintenance details are displayed when the mouse pointer is positioned over the icon.|
|*Availability*|[Availability](/manual/web_interface/frontend_sections/configuration/hosts#reading_host_availability) of the host is displayed. Four icons each represent a supported interface (Zabbix agent, SNMP, IPMI, JMX).<br>The current status of the interface is displayed by the respective color:<br>**Green** - available<br>**Red** - not available (upon mouseover, details of why the interface cannot be reached are displayed)<br>**Gray** - unknown or not configured<br>Note that active Zabbix agent items do not affect host availability.|
|*Agent encryption*|Encryption status for connections to the host is displayed:<br>**None** - no encryption<br>**PSK** - using pre-shared key<br>**Cert** - using certificate<br>|
|*Info*|Error information (if any) regarding the host is displayed.|

To configure a new host, click on the *Create host* button in the top
right-hand corner. To import a host from an XML file, click on the
*Import* button in the top right-hand corner.

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##### Mass editing options

Buttons below the list offer some mass-editing options:

-   *Enable* - change host status to *Monitored*
-   *Disable* - change host status to *Not monitored*
-   *Export* - export the hosts to an XML file
-   *Mass update* - [update several
    properties](/manual/config/hosts/hostupdate) for a number of hosts
    at once
-   *Delete* - delete the hosts

To use these options, mark the checkboxes before the respective hosts,
then click on the required button.

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##### Filter

As the list may contain very many hosts, it may be needed to filter out
the ones you really need.

The *Filter* link is available above the list of hosts. If you click on
it, a filter becomes available where you can filter hosts by name,
linked templates (since 4.0.1), if they are monitored by server or by
proxy, proxy name, DNS, IP or port number.

![](../../../../../assets/en/manual/web_interface/host_filter2.png){width="600"}

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#### Reading host availability

Host availability icons reflect the current host interface status on
Zabbix server. Therefore, in the frontend:

-   If you disable a host, availability icons will not immediately turn
    gray (unknown status), because the server has to synchronize the
    configuration changes first;
-   If you enable a host, availability icons will not immediately turn
    green (available), because the server has to synchronize the
    configuration changes and start polling the host first.

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#### Unknown host status

Zabbix server sets the host availability icon to gray (unknown status)
for the corresponding agent interface (Zabbix, SNMP, IPMI, JMX) if:

-   there are no enabled items on the interface (they were removed or
    disabled);
-   there are only active Zabbix agent items;
-   there are no pollers for that type of the interface (e.g.
    StartPollers=0);
-   host is disabled;
-   host is set to be monitored by proxy, a different proxy or by server
    if it was monitored by proxy;
-   host is monitored by a proxy that appears to be offline (no updates
    received from the proxy during the maximum heartbeat interval - 1
    hour).

Setting host availability to unknown is done after server configuration
cache synchronization. Restoring host availability
(available/unavailable) on hosts monitored by proxies is done after
proxy configuration cache synchronization.

See also more details about host
[unreachability](/manual/appendix/items/unreachability).

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