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System Socket Metricset

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System Socket Metricset

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This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.

This metricset is available on Linux only and requires kernel 2.6.14 or newer.

The system socket metricset reports an event for each new TCP socket that it sees. It does this by polling the kernel periodically to get a dump of all sockets. You set the polling interval by configuring the period option. Specifying a short polling interval with this metricset is important to avoid missing short-lived connections. For example:

metricbeat.modules:
- module: system
  metricsets: [cpu, memory]
- module: system
  metricsets: [socket] 
  period: 1s

You can configure the socket metricset separately to specify a different period value than the other metricsets.

The metricset reports the process that has the socket open. In order to provide this information, Metricbeat must be running as root. Root access is also required to read the file descriptor information of other processes.

You can configure the metricset to perform a reverse lookup on the remote IP, and the returned hostname will be added to the event and cached. If a hostname is found, then the eTLD+1 (effective top-level domain plus one level) value will also be added to the event. Reverse lookups are disabled by default.

The following example shows the full configuration for the metricset along with the defaults.

- module: system
  metricsets: [socket]
  socket.reverse_lookup.enabled: false
  socket.reverse_lookup.success_ttl: 60s
  socket.reverse_lookup.failure_ttl: 60s

Fields

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For a description of each field in the metricset, see the exported fields section.

Here is an example document generated by this metricset:

{
    "@timestamp": "2016-05-23T08:05:34.853Z",
    "beat": {
        "hostname": "host.example.com",
        "name": "host.example.com"
    },
    "metricset": {
        "module": "system",
        "name": "socket",
        "rtt": 115
    },
    "system": {
        "socket": {
            "direction": "listening",
            "family": "ipv6",
            "local": {
                "ip": "::",
                "port": 42061
            },
            "process": {
                "cmdline": "/tmp/go-build519327234/github.com/elastic/beats/metricbeat/module/system/socket/_test/socket.test -test.v=true -data",
                "command": "socket.test",
                "exe": "/tmp/go-build519327234/github.com/elastic/beats/metricbeat/module/system/socket/_test/socket.test",
                "pid": 2025
            },
            "user": {
                "id": 0,
                "name": "root"
            }
        }
    },
    "type": "metricsets"
}
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