Creating a dummy cluster

A dummy cluster is an imitation of a cluster that can be used to test the platform. Only fake entities — nodes and virtual machines — can be created in a dummy cluster. Dummy cluster entities mimic the behavior of the real ones, but do not perform their functions. For example, you will not be able to connect to a node in such a cluster via SSH.

To create a dummy cluster:

1. Create a cluster with any parameters in the platform interface. Save the value of the cluster id.
2. Connect to the server with the platform via SSH.

3. Connect to the DBMS:
   

   There are potential risks involved in altering a database. We do not recommend making manual edits to the database, as it can disrupt the correct operation of the platform.

   Create a backup of the platform before performing any actions with the database.

   
   

   As the platform is in the process of transitioning to the PostgreSQL DBMS, different instances of VMmanager may use different DMBS.

   The platform uses PostgreSQL in all new installations starting with version 2026.03.1. In all other cases, the platform uses MySQL. The DBMS is not changed when the platform is updated.

   To determine the type of DBMS, run the following command on the platform server:

   docker ps --filter name=pgsql

   Example answer

   CONTAINER ID   IMAGE         COMMAND                  CREATED      STATUS      PORTS      NAMES
   3213c5dc94d0   postgres:12   "docker-entrypoint.s…"   5 days ago   Up 4 days   5432/tcp   pgsql

   If the command output contains information about the container, the platform uses PostgreSQL; if the response is empty, it uses MySQL.

   MySQL

   docker exec -it mysql bash -c "mysql isp -p\$MYSQL_ROOT_PASSWORD"

   PostgreSQL

   docker exec -it pgsql bash -c "psql -d isp

4. Change the cluster type: 

   update vm_cluster set virtualization_type = "dummy" where id = <cluster_id>;

   Comments to the command

   <cluster_id> — id of the cluster

5. Exit the DBMS console: 

   \quit

6.  In the platform interface, enter Clusters. If the commands are executed successfully, the cluster type will change to Dummy.

To add a node to the dummy cluster:

1. Enter Nodes → click Connect a node.
2. In the Cluster field, select the dummy cluster. For the other parameters, specify arbitrary values.
3. Click Connect a node.