Query join status
To find out whether a node has been joined to a cluster, complete the following steps.
-
Query the /api/cluster/join_request endpoint on the node whose join status you want to figure out.
curl GET --cookie cookies https://<IP-address-of-node-to-be-queried>/api/cluster/join_request
The following is a sample response received.
For details of the meta object, see Message format.
"details": { "central_management_address": "<IP-address-of-Central-Management-node>" }, "meta": { "href": "/api/cluster/join_request", "parent": "/api/cluster", "remaining_seconds": 600 }, "status": "in cluster" }Elements Type Description details Top-level element Contains the IP address of the Central Management node of the cluster. central_management_address string The IP address of the Central Management node.
Not provided when no cluster has been set up yet.
status string Possible values are:
- not configured: Displayed when no cluster has been set up yet.
- in progress: Displayed when the join action is in progress.
- in cluster: Displayed when the node is already in the cluster.
Assign a role to a node
By default, nodes do not have any roles assigned to them. The only exception is the Central Management node, which you specifically promoted to fulfill that role. To assign a role to a node in the cluster, complete the following steps.
-
Open a transaction.
For details, see Open a transaction.
-
Update the JSON object of the node.
PUT the role you want to assign to the node and the node's IP address as a JSON object to the https://<IP-address-of-Central-Management-node>/api/cluster/nodes/<node-id-of-node-to-be-updated> endpoint.
You can assign the following roles to a node:
NOTE: The central-management role can only be assigned using the /api/cluster/promote endpoint.
NOTE: Ensure that each node has a search role and only one search role.
Role Description managed-host There can be several nodes with this role.
Nodes with the Managed Host role synchronize their entire configuration from the Central Management node, not only those elements of the configuration that are related to the cluster.
search-master
There can be only one node with this role.
The Search Master node is the one node in the cluster on which you can search all the session data recorded by other nodes in the cluster, provided that the other nodes have been assigned the Search Minion role.
search-minion
There can be several nodes with this role.
Nodes with the Search Minion role send session data that they recorded to the Search Master for central search purposes. The session data recorded by a Search Minion node is not searchable on the node itself, only on the Search Master.
search-local There can be several nodes with this role.
Nodes with the Search Local role keep the session data that they recorded for local searching. The session data recorded by a Search Local node is searchable on the node itself, but not on the Search Master.
This is the only backward-compatible search role.
For further details on roles, see "Cluster roles" in the Administration Guide.
The body of the PUT request should be the following:
{ "roles": ["<role-to-assign>"], "address": "<IP-address-of-node-to-be-updated>" }For example:
curl -H "Content-Type: application/json" --cookie cookies -X PUT https://<IP-address-of-Central-Management-node>/api/cluster/nodes/46f97a58-4028-467d-9a22-9cfe78ae3e1c --data '{"roles": ["managed-host"], "address": "<IP-address-of-node-to-be-updated>"}' -
Commit your changes.
For details, see Commit a transaction.
Query nodes
To list the nodes available in a cluster, complete the following steps.
-
Query the /api/cluster/nodes endpoint on the Central Management node.
curl --cookie cookies https://<IP-address-of-Central-Management-node>/api/cluster/nodes
The following is a sample response received.
For details of the meta object, see Message format.
{ "items": [ { "key": "46f97a58-4028-467d-9a22-9cfe78ae3e1c", "meta": { "href": "/api/cluster/nodes/46f97a58-4028-467d-9a22-9cfe78ae3e1c", "status": "/api/cluster/status/46f97a58-4028-467d-9a22-9cfe78ae3e1c" } }, { "key": "b35c54da-b556-4f91-ade5-d26283d68277", "meta": { "href": "/api/cluster/nodes/b35c54da-b556-4f91-ade5-d26283d68277", "status": "/api/cluster/status/b35c54da-b556-4f91-ade5-d26283d68277" } } ], "meta": { "href": "/api/cluster/nodes", "parent": "/api/cluster", "remaining_seconds": 28800, "self": "/api/cluster/nodes/b35c54da-b556-4f91-ade5-d26283d68277", "status": "/api/cluster/status" } }Elements Type Description items Top-level element (list of JSON objects) List of endpoints (objects) available from the current endpoint. key string The ID of the node. meta Top-level item (JSON object) Contains links to different parts of the REST service. href string (relative path) The path of the node that returned the response. status string (relative path) The path to the status of the node that returned the response.
Query one particular node
To query one particular node, complete the following steps.
-
Query the /api/cluster/nodes/<node-id-of-node-to-be-queried> endpoint on the node that you want to query.
curl --cookie cookies https://<IP-address-of-node-to-be-queried>/api/cluster/nodes/<node-id-of-node-to-be-queried>
The following is a sample response received.
For details of the meta object, see Message format.
{ "body": { "address": "<IP-address-of-node-to-be-queried>", "roles": [ "central-management" ] }, "key": "b35c54da-b556-4f91-ade5-d26283d68277", "meta": { "href": "/api/cluster/nodes/b35c54da-b556-4f91-ade5-d26283d68277", "parent": "/api/cluster/nodes", "remaining_seconds": 28800, "status": "/api/cluster/status/b35c54da-b556-4f91-ade5-d26283d68277" } }Elements Type Description body Top-level element (JSON object) Contains the JSON object of the node. address string The IP address of the node. roles string The role assigned to the node. key string The ID of the node.