Add services

In ADCM a service means a software that performs some function. Examples of services for ADPG clusters: ADPG, Chrony, etc. The steps for adding services to a cluster are listed below:

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

    Select a cluster
    Select a cluster
  2. Open the Services tab on the cluster page and click Add service.

    Switch to adding services
    Switch to adding services
  3. In the opened dialog, select services that should be added to the cluster and click Add.

    Select services
    Select services
    IMPORTANT
    ADPG Enterprise Edition requires Etcd (the built-in ADPG Etcd service or an external Etcd cluster) to use it as Patroni Distributed Configuration Store (DCS). Its settings must be specified during installation, after installation they cannot be changed.

    The brief description of available services is listed below. CE means the ADPG Community Edition, EE — the ADPG Enterprise Edition.

    Services that can be added to the ADPG cluster
    Service Mandatory Edition Purpose

    ADPG

    Yes

    CE/EE

    A core service corresponding to the object-relational DBMS PostgreSQL

    Balancer

    No

    EE

    The service is based on HAProxy that implements load balancing

    Chrony

    No

    CE/EE

    A time service. Provides time synchronization for the cluster hosts, that is necessary for the cluster to work correctly. If the time service is already configured on the hosts, there is no need to install Chrony

    Etcd

    No

    EE

    The ADPG enterprise edition requires Etcd to use it as the Patroni Distributed Configuration Store (DCS). You can utilize the built-in ADPG Etcd service or an external Etcd cluster. If you want to use the external Etcd cluster, do not add the built-in Etcd service on the Services tab. Instead, set External Etcd cluster settings on the Primary configuration tab of the ADPG service. To specify them, open Clusters → ADPG cluster → Services → ADPG → Primary configuration as described in Configure services

    Metrics storage

    No

    CE/EE

    Is used as a storage for database and system metrics. For more information, see Monitoring

  4. As a result, the added services are displayed at the Services tab.

    The result of successful adding services to a cluster
    The result of successful adding services to a cluster
NOTE
You can also add services later. The process of adding new services to already running cluster does not differ from installing a service from scratch.
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