/_nodes/stats missing node data on RHEL 7

Elastic Stack Elasticsearch
1

We're running Elasticsearch 5.6 on Redhat Enterprise v7, and we see missing node data in the Elasticsearch node stats data.

e.g.
curl -XGET http://node1:9200/_nodes/stats?pretty

Returns:-
"os" : {
"timestamp" : 1542364508893,
"cpu" : {
"percent" : -1,
"load_average" : {
"1m" : 1.2,
"5m" : 1.19,
"15m" : 1.38
}
},
"mem" : {
"total_in_bytes" : -1,
"free_in_bytes" : -1,
"used_in_bytes" : 0,
"free_percent" : 0,
"used_percent" : 0
},
"swap" : {
"total_in_bytes" : -1,
"free_in_bytes" : -1,
"used_in_bytes" : 0
},

and,

      "process" : {
    "timestamp" : 1542364508893,
    "open_file_descriptors" : -1,
    "max_file_descriptors" : -1,
    "cpu" : {
      "percent" : -1,
      "total_in_millis" : -1
    },
    "mem" : {
      "total_virtual_in_bytes" : -1
    }

As far as I can tell, Elasticsearch should be collecting this data itself, but I can't find any documentation as to how. I suspect that some tools may be missing from our Redhat 7 install, but my Google-fu has failed to turn-up any suggestions as to what.

Any help gratefully received.

Youichi.

2

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