Hello Almaz Akhmadullin,
Thank you for reaching out to the Segura® community!
To configure one of your instances as the primary node in the cluster, you can run the following command directly on the instance that you want to designate as primary:
orbit app master
This will promote that specific node to primary within the replication cluster.
Regarding the network issue and the inability to ping between nodes (or from your host machine), we suggest reviewing the following community article:
How to configure the senhasegura instance to receive pings
If you continue to experience issues after following these steps, feel free to share more details and we’ll be happy to assist.
Best regards.