Getting Group Information
- reference
Group information can be retrieved with the GET /pools/default/serverGroups HTTP method and URI.
Description
This retrieves information about groups. The information includes statistics, for each node, on memory allocation, memory consumption, and cpu utilization. It also includes URIs and UUIDs whereby groups can be accessed and managed, and the overall configuration changed.
See Server Group Awareness, for a conceptual overview of groups.
Curl Syntax
curl -X GET -u <administrator>:<password> http://<host>:<port>/pools/default/serverGroups
Responses
If successful, 200 OK is given, and an object containing group-related information is returned.
A malformed URI gives 400 Object Not Found.
Failure to authenticate gives 401 Unauthorized.
Returned-Object Contents
The returned object contains a nested object for each group. Each group-object contains a nested object for each node. Each node-object includes the following:
-
systemStats. Information on cpu-utilization, swap space, and total memory. -
interestingStats. Data and disk sizes, and numbers of items in active and replica vBuckets. -
uptime. The number of seconds elapsed since the server started. -
cpuCountThe number of cpu’s supporting the server.
URIs and UUIDs are also provided, allowing the groups to be accessed and managed, and the overall configuration changed. See the example immediately below, for the complete output; and for additional information on URIs and UUIDs.
Example
In the following example, the command-line output is piped to jq, for formatting.
curl -u Administrator:password -v -X GET \ http://10.143.190.101:8091/pools/default/serverGroups | jq
The output is as follows:
{
"groups": [
{
"name": "Group 1",
"uri": "/pools/default/serverGroups/0",
"addNodeURI": "/pools/default/serverGroups/0/addNode",
"nodes": [
{
"systemStats": {
"cpu_utilization_rate": 23.71134020618557,
"swap_total": 536866816,
"swap_used": 165117952,
"mem_total": 1040723968,
"mem_free": 166445056
},
"interestingStats": {
"cmd_get": 0,
"couch_docs_actual_disk_size": 141769446,
"couch_docs_data_size": 130150089,
"couch_spatial_data_size": 0,
"couch_spatial_disk_size": 0,
"couch_views_actual_disk_size": 267024,
"couch_views_data_size": 267024,
"curr_items": 12948,
"curr_items_tot": 36389,
"ep_bg_fetched": 0,
"get_hits": 0,
"mem_used": 50137576,
"ops": 0,
"vb_active_num_non_resident": 0,
"vb_replica_curr_items": 23441
},
"uptime": "18261",
"memoryTotal": 1040723968,
"memoryFree": 166445056,
"mcdMemoryReserved": 794,
"mcdMemoryAllocated": 794,
"couchApiBase": "http://10.143.190.101:8092/",
"couchApiBaseHTTPS": "https://10.143.190.101:18092/",
"otpCookie": "27261cc14700dc3015c131a3eced0afbb0eac96e808541fd3375c777a959220a",
"clusterMembership": "active",
"recoveryType": "none",
"status": "healthy",
"otpNode": "ns_1@10.143.190.101",
"thisNode": true,
"hostname": "10.143.190.101:8091",
"clusterCompatibility": 393216,
"version": "6.0.0-1693-enterprise",
"os": "x86_64-unknown-linux-gnu",
"cpuCount": 1,
"ports": {
"httpsMgmt": 18091,
"httpsCAPI": 18092,
"proxy": 11211,
"direct": 11210
},
"services": [
"kv",
"n1ql"
]
}
]
},
{
"name": "Group 2",
"uri": "/pools/default/serverGroups/3b66b3c3177f44a3ffa6771ffeb31f36",
"addNodeURI": "/pools/default/serverGroups/3b66b3c3177f44a3ffa6771ffeb31f36/addNode",
"nodes": [
{
"systemStats": {
"cpu_utilization_rate": 6.185567010309279,
"swap_total": 536866816,
"swap_used": 29704192,
"mem_total": 1040723968,
"mem_free": 138309632
},
"interestingStats": {
"cmd_get": 0,
"couch_docs_actual_disk_size": 108280244,
"couch_docs_data_size": 95735497,
"couch_spatial_data_size": 0,
"couch_spatial_disk_size": 0,
"couch_views_actual_disk_size": 266812,
"couch_views_data_size": 266812,
"curr_items": 12948,
"curr_items_tot": 36485,
"ep_bg_fetched": 0,
"get_hits": 0,
"mem_used": 50453112,
"ops": 0,
"vb_active_num_non_resident": 0,
"vb_replica_curr_items": 23537
},
"uptime": "18219",
"memoryTotal": 1040723968,
"memoryFree": 138309632,
"mcdMemoryReserved": 794,
"mcdMemoryAllocated": 794,
"couchApiBase": "http://10.143.190.102:8092/",
"couchApiBaseHTTPS": "https://10.143.190.102:18092/",
"otpCookie": "27261cc14700dc3015c131a3eced0afbb0eac96e808541fd3375c777a959220a",
"clusterMembership": "active",
"recoveryType": "none",
"status": "healthy",
"otpNode": "ns_1@10.143.190.102",
"hostname": "10.143.190.102:8091",
"clusterCompatibility": 393216,
"version": "6.0.0-1693-enterprise",
"os": "x86_64-unknown-linux-gnu",
"cpuCount": 1,
"ports": {
"httpsMgmt": 18091,
"httpsCAPI": 18092,
"proxy": 11211,
"direct": 11210
},
"services": [
"kv"
]
},
{
"systemStats": {
"cpu_utilization_rate": 7.142857142857143,
"swap_total": 536866816,
"swap_used": 158781440,
"mem_total": 1040723968,
"mem_free": 177274880
},
"interestingStats": {
"cmd_get": 0,
"couch_docs_actual_disk_size": 65310435,
"couch_docs_data_size": 53415534,
"couch_spatial_data_size": 0,
"couch_spatial_disk_size": 0,
"couch_views_actual_disk_size": 281091,
"couch_views_data_size": 281091,
"curr_items": 12998,
"curr_items_tot": 36505,
"ep_bg_fetched": 0,
"get_hits": 0,
"mem_used": 68983568,
"ops": 0,
"vb_active_num_non_resident": 0,
"vb_replica_curr_items": 23507
},
"uptime": "18102",
"memoryTotal": 1040723968,
"memoryFree": 177274880,
"mcdMemoryReserved": 794,
"mcdMemoryAllocated": 794,
"couchApiBase": "http://10.143.190.103:8092/",
"couchApiBaseHTTPS": "https://10.143.190.103:18092/",
"otpCookie": "27261cc14700dc3015c131a3eced0afbb0eac96e808541fd3375c777a959220a",
"clusterMembership": "active",
"recoveryType": "none",
"status": "healthy",
"otpNode": "ns_1@10.143.190.103",
"hostname": "10.143.190.103:8091",
"clusterCompatibility": 393216,
"version": "6.0.0-1693-enterprise",
"os": "x86_64-unknown-linux-gnu",
"cpuCount": 1,
"ports": {
"httpsMgmt": 18091,
"httpsCAPI": 18092,
"proxy": 11211,
"direct": 11210
},
"services": [
"kv",
"n1ql"
]
}
]
}
],
"uri": "/pools/default/serverGroups?rev=93706877"
}
The output shows that two groups are defined: Group 1 and Group 2.
It also shows that Group 1 contains a single node, which is 10.143.190.101, while Group 2 contains two nodes, which are 10.143.190.102 and 10.143.190.103.
The following, specific values within the returned object provide URIs and UUIDs for management purposes, and should be duly noted:
-
"uri": "/pools/default/serverGroups?rev=93706877". Specifies the URI path and revision integer for the overall group-configuration. This integer changes whenever the group-configuration is changed. See Updating Server Group Memberships for an example of changing the configuration. Note that the configuration-change itself requires that this URI path and revision integer be specified, to identify the current group-configuration. -
"uri":"/pools/default/serverGroups/<:uuid>". Provided for each group, to specify the group’s URI path and UUID string. See Updating Server Group Memberships for an example of changing the configuration by means of a JSON document that identifies each group by this means. -
"addNodeURI":"/pools/default/serverGroups/<:uuid>/addNode". Provided for each group, to specify the URI path and UUID string for adding servers to the group. See Adding Nodes to Groups for an example of adding a node by this means.
See Also
See Updating Server Group Memberships for an example of changing the node-to-group configuration. See Server Group Awareness, for a conceptual overview of groups. See Manage Groups, for examples of managing groups by means of Couchbase Web Console.