Assigning roles might be required after you install Elastic Cloud Enterprise on hosts to make sure the new hosts (runners) can be used for their intended purpose and to remove roles from the initial host to implement the recommended cluster topology. Similarly, if you need more processing capacity for Elasticsearch nodes in your cluster, change the role of a new runner to
allocator to add its capacity to your installation.
These steps describe how to assign roles from the Cloud UI. For automation purposes, assigning roles with a token you generate is preferred.
Each Elastic Cloud Enterprise runner can take on several roles:
- Allocates the available computing resources to Elasticsearch or Kibana clusters. In larger installations, a majority of the machines will be allocators.
- Serves as a distributed coordination system and resource scheduler.
- Manages communication between a user and an Elasticsearch or Kibana instance.
- Manages the ZooKeeper datastore. This role is typically shared with the coordinator role. In production deployments it can be separated from a coordinator.
Each role is associated with a set of Docker containers that provide the specific functionality.
To assign roles to runners:
- Log into the Cloud UI.
- Go to Platform and select a Elastic Cloud Enterprise installation. The roles for each runner are shown.
- To update the roles, select a specific runner and then select Update roles.
- Let the user interface guide you through updating the node roles.
Elastic Cloud Enterprise automatically starts managing the node in its new role and makes it available for use.
To learn more about how you should assign roles, see topology recommendations.