Page History

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

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

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

title

Note

title	Attention!

All

Cluster Servers

cluster servers must be available to each other.

It is necessary to use Servers

You must use servers with the same architecture (x64), OS type, and PostgreSQL version.

Note

Attention!

The first three

Servers

servers added become the

master Servers

manager servers.
The operation of the cluster is coordinated by its

master Servers

manager servers, which, in particular, take decisions to migrate nodes from one

Server

server to another.
The number of

the master Servers

manager servers in the cluster must

be odd, not less than three and not more than five.

be either 3 or 5.
The role of the manager server doesn't affect the configuration and implementation of fault tolerance. Thus, the manager server can be used as a fault-tolerant one (for example, to implement a 2+1 configuration).
If you add only two servers

If only two Servers are added

, they can be configured as 1+1—master

+ backup

Server

server (see 1+1 cluster configuration).

If requirednecessary, you can add a user with administrator rights privileges (see Set up access to a supervisor). After the cluster is created, only this user will have access to the supervisor. Do the following:
1. Click the ADD button.
2. Enter access credentials and click the NEXT button.
After you added add all Serversservers, click the INITIALIZE button.

This will initialize the cluster based on the selected Serversservers.

Infonote

title	NoteAttention!

If, during the process of cluster creation, you

added

add the

Server

servers that were already added to another cluster, they will be unavailable. If you try to initialize the cluster with unavailable

Servers

servers, they will be marked red, and the cluster won't be initialized.

Image Removed

In

In this case you

need to

must go back to the step of adding the

Servers

servers and add the available servers.
If you add servers with different Axxon One versions to the cluster, the following version mismatch notification will appear on the Servers

.

tab—Some versions don't match. Please update!
In this case, for the cluster to work correctly, we recommend updating all servers to the same version of Axxon One.
In case of a network connection loss with a specific server within a cluster, the system initiates the migration of nodes to other servers with an available and stable network. The nodes that are left on servers with limited or absent network connection keep working locally. This allows increasing the cluster's stability and ensures its correct functioning even in conditions of an unstable or partially unavailable network.

To add other Servers servers to the cluster, do the following:
On the

...

Servers tab, click the Image Modified button.

Enter the IP address of the Serverserver.
If the Server server that you are adding is masteradd is the manager one, set the Manager checkboxcorresponding checkbox.
Click the ADD HOST button.
Add all required Serversservers.