A Zabbix proxy can collect performance and availability data on behalf of the Zabbix server. This way, a proxy can take on itself some of the load of collecting data and offload the Zabbix server.
Also, using a proxy is the easiest way of implementing centralized and distributed monitoring, when all agents and proxies report to one Zabbix server and all data is collected centrally.
A Zabbix proxy can be used to:
The proxy requires only one TCP connection to the Zabbix server. This way it is easier to get around a firewall as you only need to configure one firewall rule.
Zabbix proxy must use a separate database. Pointing it to the Zabbix server database will break the configuration.
All data collected by the proxy is stored locally before transmitting it over to the server. This way no data is lost due to any temporary communication problems with the server. The ProxyLocalBuffer and ProxyOfflineBuffer parameters in the proxy configuration file control for how long the data are kept locally.
It may happen that a proxy, which receives the latest configuration changes directly from Zabbix server database, has a more up-to-date configuration than Zabbix server whose configuration may not be updated as fast due to the value of CacheUpdateFrequency. As a result, proxy may start gathering data and send them to Zabbix server that ignores these data.
Zabbix proxy is a data collector. It does not calculate triggers, process events or send alerts. For an overview of what proxy functionality is, review the following table:
|Function||Supported by proxy|
|Zabbix agent checks||Yes|
|Zabbix agent checks (active)||Yes 1|
|Log file monitoring||Yes|
|Built-in web monitoring||Yes|
 To make sure that an agent asks the proxy (and not the server) for active checks, the proxy must be listed in the ServerActive parameter in the agent configuration file.
To configure a proxy in Zabbix front end:
|Proxy name||Enter the proxy name. It must be the same name as in the Hostname parameter in the proxy configuration file.|
|Proxy mode||Select the proxy mode.
Active - the proxy will connect to the Zabbix server and request configuration data
Passive - Zabbix server connects to the proxy
Note that (sensitive) proxy configuration data may become available to parties having access to the Zabbix server trapper port when using an active proxy. This is possible because anyone may pretend to be an active proxy and request configuration data; authentication does not take place.
|Hosts||Add hosts to be monitored by the proxy.|
You can specify that an individual host should be monitored by a proxy in the host configuration form, using the Monitored by proxy field.
Host mass update is another way of specifying that hosts should be monitored by a proxy.