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The first time you launch the Supervisor, you should initialize the cluster. To do this, do the following:

1. Select the Server's IP address from the list and click NEXT.
   

2. Add the required Servers to the cluster. To do this, enter the IP address and click LINK.
   

   Attention!

   Note
   title Attention!
   title	All Cluster cluster Servers must be accessible available to each other. All Servers must be hosted on computers It is necessary to use Servers with the same architecture (x64) .
   Note
   , OS type and PostgreSQL version. The first three Servers added become the master Servers. The operation of the cluster is coordinated by its master Servers, which, in particular, take decisions to migrate nodes from one Server to another. You can have 3 or The number of the master Servers in the cluster must be either 3 or 5. The role of the master Server does not affect the configuration and implementation of fault tolerance. Thus, the master server can be used as a fault-tolerant one (for example, to implement a 2+1 configuration). If only two Servers are added, they can be configured as 1+1 (primary —master + backup Server (see 1+1 cluster configuration).

3. If required, you can add a user with administrator rights (see Set up access to a supervisor). After the cluster is created, only this user will have access to the supervisor. Please follow Do the steps belowfollowing:

   1. Click the Add button ADD button.
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   2. Enter access credentials and click the NEXT button.

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4. After you added all Servers, click the INITIALIZE button.

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This will initialize the cluster based on the selected Servers.

To add other To add more Servers to the cluster, do the following:

1. On the HOSTS tab, click Image Removed Image Added.
2. Enter the IP address of the Server.
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3. If the Server you are adding is master, select set the Manager checkbox.

4. Click ADD HOST.
5. Add all required Servers.
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