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

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

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

    note
    Note
    titleAttention!
    • All
    Cluster Servers
    • cluster servers must be
    accessible
    • available to each other.
    It is necessary to use Servers
    • You must use servers with the same architecture (x64), OS type, and PostgreSQL version.
    titleAttention!
    • 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.
    • 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
    —primary
    • —master + backup
    Server

  3. 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 ADD button.
      Image RemovedImage Added

    2. Enter access credentials and click the NEXT button.

      Image Added

  4. After you added add all Serversservers, click the INITIALIZE button.

    Image AddedImage Removed

This will initialize the cluster based on the selected servers.

Note
titleAttention!
  • If, during the process of cluster creation, you add the servers that were already added to another cluster, they will be unavailable. If you try to initialize the cluster with unavailable servers, they will be marked red, and the cluster won't be initialized. In this case you must go back to the step of adding the 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 To add more Servers to the cluster, do the following:
On the

...

Servers tab, click

...

the Image Added button.

  1. Enter the IP address of the Serverserver.
    Image RemovedImage Added

  2. If the Server server that you are adding is masteradd is the manager one, set the Manager checkboxcorresponding checkbox.

  3. Click the ADD HOST button.
  4. Add all required Serversservers.
    Image RemovedImage Added
Info
titleNote

To remove a Server server from the cluster, click Image Removed Image Added and then Remove.
Image RemovedImage Added

Note
titleAttention!

To If you want to change the IP addresses of the Server server in the cluster, do the following:

  1. Remove the Server server from the cluster.
  2. Change the IP address of the Serverserver.
  3. Add the Server server with a new IP address.