Add components

Daria Barysheva

In ADCM, a component means a part of a service that should be deployed on one or several cluster hosts. For example, the ADB service consists of the ADB Master, ADB Segment, and ADB Standby components.

IMPORTANT

Initially, there are no components on any of cluster hosts. You should map components to hosts manually.

The steps for adding components to hosts are listed below:

Select a cluster on the Clusters page. To do this, click a cluster name in the Name column.

Select a cluster
Open the Mapping tab on the cluster page.

Switch to mapping service components

In the window that opens, map components to hosts. To assign hosts for each component, click Add hosts and select hosts in the pop-up window.

Select hosts for a component

Mandatory components

Each service can have mandatory and optional components. Mandatory components are highlighted in red. The ADCM UI also displays how many mandatory components should be installed.

Mandatory components

CAUTION

Without assigning a necessary number of hosts to mandatory components, the component mapping cannot be saved.

The typical scheme of mapping components in ADB clusters is described in the table below. It is based on the Enterprise Edition of ADB.

Example of mapping ADB components to hosts
Host	Service	Component	Notes
Master host	ADB	ADB Master	Should be installed only on one master host
Master host	Chrony	NTP Master	Should be installed only on one master host
Secondary Master Host (Standby)	ADB	ADB Standby	Should be installed on the standby master host
Secondary Master Host (Standby)	Chrony	NTP Secondary	Can be installed optionally on the standby master host
Segment host (1..N)	ADB	ADB Segment	Should be installed on one or more segment hosts
	Chrony	NTP Slave	Can be installed optionally on one or more segment hosts
	PXF	PXF	Should be installed on one or more segment hosts and, optionally, on the master host
Monitoring host	Monitoring	Prometheus Server	If monitoring is used, the *Prometheus Server* and *Grafana* components are recommended to be installed on a host separate from ADB.
Monitoring host	Monitoring	Grafana
PgBouncer host	PgBouncer	PgBouncer	If PgBouncer is used, it can be installed on a host separate from ADB, on the master host, or on the standby master host; it cannot be installed on a segment host

IMPORTANT

Depending on where you install PgBouncer, the pg_hba rules required to enable connections to ADB via PgBouncer can differ. For more details, refer to the Allow PgBouncer connections section in the PgBouncer configuration parameters.

After component distribution is completed, click Save.

Save mapping of components

Starting with ADCM 2.2.0, you can use another mapping mode — by hosts. To do this, switch on the Hosts mode toggle and map components to hosts by clicking Add components for each host sequentially.

Use mapping by hosts

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