The generated host object uses the `cluster-zone` check command as
[health check](6-distributed-monitoring.md#distributed-monitoring-health-checks).
-> **Tip** In case you want to blacklist or whitelist certain hosts and/or services
+> **Tip**
+>
+> In case you want to blacklist or whitelist certain hosts and/or services
> on the master, use the `icinga2 node {black,white}list`
> commands.
features can enable HA functionality.
> **Note**
+>
> All nodes in the same zone require that you enable the same features for high-availability (HA).
Overview:
-- one executed locally (`ping4`) and one using command endpoint (`disk`).
> **Tip**
+>
> It's a good idea to add [health checks](6-distributed-monitoring.md#distributed-monitoring-health-checks)
> to make sure that your cluster notifies you in case of failure.
-- one executed locally (`ping4`) and one using command endpoint (`disk`).
> **Tip**
+>
> It's a good idea to add [health checks](6-distributed-monitoring.md#distributed-monitoring-health-checks)
> to make sure that your cluster notifies you in case of failure.