11.3. Node Management

11.3.1. Adding a node

Go to http://server1:5984/_membership to see the name of the node and all the nodes it knows about and are connected too.

curl -X GET "http://xxx.xxx.xxx.xxx:5984/_membership" --user admin-user
{
    "all_nodes":[
        "node1@xxx.xxx.xxx.xxx"],
    "cluster_nodes":[
        "node1@xxx.xxx.xxx.xxx"]
}
  • all_nodes are all the nodes thats this node knows about.
  • cluster_nodes are the nodes that are connected to this node.

To add a node simply do:

curl -X PUT "http://xxx.xxx.xxx.xxx:5986/_nodes/node2@yyy.yyy.yyy.yyy" -d {}

Now look at http://server1:5984/_membership again.

{
    "all_nodes":[
        "node1@xxx.xxx.xxx.xxx",
        "node2@yyy.yyy.yyy.yyy"
    ],
    "cluster_nodes":[
        "node1@xxx.xxx.xxx.xxx",
        "node2@yyy.yyy.yyy.yyy"
    ]
}

And you have a 2 node cluster :)

http://yyy.yyy.yyy.yyy:5984/_membership will show the same thing, so you only have to add a node once.

11.3.2. Removing a node

Before you remove a node, make sure that you have moved all shards away from that node.

To remove node2 from server yyy.yyy.yyy.yyy, you need to first know the revision of the document that signifies that node’s existence:

curl "http://xxx.xxx.xxx.xxx:5986/_nodes/node2@yyy.yyy.yyy.yyy"
{"_id":"node2@yyy.yyy.yyy.yyy","_rev":"1-967a00dff5e02add41820138abb3284d"}

With that _rev, you can now proceed to delete the node document:

curl -X DELETE "http://xxx.xxx.xxx.xxx:5986/_nodes/node2@yyy.yyy.yyy.yyy?rev=1-967a00dff5e02add41820138abb3284d"