Add components

Eugenia Kuzina, Daria Barysheva

In ADCM a component means a part of a service that should be deployed on one or several cluster hosts.

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

Currently, ADPG and NTP Master components are mandatory and should be placed on one host.

CAUTION

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

An example of components distribution for the ADPG Enterprise Edition is shown in the table below.

ADPG components distribution
Host	Service	Component	Notes
Host 1	ADPG	ADPG	Can be a leader or replica in the HA architecture
Host 1	Chrony	NTP Master	—
Host 2	ADPG	ADPG	Can be a leader or replica in the HA architecture
Host 2	Chrony	NTP Secondary	—
Host 3	ADPG	ADPG	Can be a leader or replica in the HA architecture
Host 3	Chrony	NTP Secondary	—
Host 4	Etcd	Etcd	You must use an odd number of nodes for the Etcd component. Three or more nodes are recommended
Host 4	Chrony	NTP Slave	—
Host 5	Etcd	Etcd	You must use an odd number of nodes for the Etcd component. Three or more nodes are recommended
Host 5	Chrony	NTP Slave	—
Host 6	Etcd	Etcd	You must use an odd number of nodes for the Etcd component. Three or more nodes are recommended
Host 6	Chrony	NTP Slave	—
Host 7	Balancer	HAProxy	—

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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