Join node(s) to the cluster
Once you have a Central Management SPS node in place, then you can join other nodes to your cluster.
To join nodes to your cluster, complete the following steps for each node that you want to join to the cluster:
-
Open a transaction.
For more information, see Open a transaction.
-
Create a join request.
POST the IP address of the Central Management node as a JSON object to the https://<IP-address-of-node-to-join-to-cluster>/api/cluster/join_request endpoint. The body of the POST request should be the following:
{
"central_management_address": "<IP-address-of-Central-Management-node>"
}
For example:
curl -X POST -H "Content-Type: application/json" --cookie cookies https://<IP-address-of-node-to-join-to-cluster>/api/cluster/join_request --data '{"central_management_address": "<IP-address-of-Central-Management-node>"}'
The following is a sample response received.
For more information on the meta object, see Message format.
By default, no role is assigned to a non-management node, that is why the "roles" array is empty.
{
"body": {
"address": "<IP-address-of-node-joined-to-cluster>",
"node_id": "46f97a58-4028-467d-9a22-9cfe78ae3e1c",
"psk": "Ler7HZDFmZCxnLLgHNRfZYfORhlZS99l9vEVr5UKtJEb1d4WeaHcBmQJLs4VDWIn",
"roles": []
},
"meta": {
"href": "/api/cluster/join_request",
"parent": "/api/cluster",
"remaining_seconds": 600
}
}
| body |
|
Top-level element (JSON object) |
Contains the JSON object of the node. |
|
address |
string |
The IP address of the node. |
|
node_id |
string |
A reference ID for the node. |
|
psk |
string |
The pre-shared key of the node used for authentication. |
|
roles |
string |
The role of the node. |
-
Join the node to the cluster.
POST the "body" object of the response to the https://<IP-address-of-Central-Management-node>/api/cluster/nodes endpoint as a JSON object. The body of the POST request should be the following:
{
"address": "<IP-address-of-node-joined-to-cluster>",
"node_id": "46f97a58-4028-467d-9a22-9cfe78ae3e1c",
"psk": "Ler7HZDFmZCxnLLgHNRfZYfORhlZS99l9vEVr5UKtJEb1d4WeaHcBmQJLs4VDWIn",
"roles": []
},
For example:
POST -H "Content-Type: application/json" --cookie cookies https://<IP-address-of-Central-Management-node>/api/cluster/nodes --data '{"address": "<IP-address-of-node-joined-to-cluster>", "node_id": "46f97a58-4028-467d-9a22-9cfe78ae3e1c", "psk": "Ler7HZDFmZCxnLLgHNRfZYfORhlZS99l9vEVr5UKtJEb1d4WeaHcBmQJLs4VDWIn","roles": []}'
If the POST request is successful, the response includes:
{
"body": {
"address": "<IP-address-of-node-joined-to-cluster>",
"roles": []
},
"key": "46f97a58-4028-467d-9a22-9cfe78ae3e1c",
"meta": {
"href": "/api/cluster/nodes/46f97a58-4028-467d-9a22-9cfe78ae3e1c",
"parent": "/api/cluster/nodes",
"remaining_seconds": 28800
}
}
-
Commit your changes on both the Central Management node and the node you joined to the cluster.
For details, see Commit a transaction.
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 more information on 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"
}
| 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 more information, 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.
| 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 more information, 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 more information on 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"
}
}
| 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. |
