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CoreDNS Integration

Version	0.9.0 [beta] 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. (View all)
Compatible Kibana version(s)	8.13.0 or higher
Supported Serverless project types What’s this?	Security Observability
Subscription level What’s this?	Basic
Level of support What’s this?	Elastic

This integration parses logs from CoreDNS instances.

Compatibility

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This integration is designed to read CoreDNS logs running within a Kubernetes cluster or via systemd with logs output to journald. The CoreDNS datasets were tested with version 1.9.3 and 1.10.0.

Logs

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The log data stream expects logs from the CoreDNS errors plugin and the log plugin. Query logs from the log plugin can be in either the common or combined format (see log format for details). An example configuration with logging enabled is:

. {
  forward . 8.8.8.8
  errors
  log
}

ECS Field Reference

Please refer to the following document for detailed information on ECS fields.

Exported fields

Field	Description	Type
@timestamp	Event timestamp.	date
cloud.image.id	Image ID for the cloud instance.	keyword
coredns.log.buffer_size	The EDNS0 buffer size advertised in the query	long
coredns.log.dnssec_ok	The DO bit is included in a DNS query and is an abbreviation for "DNSSEC OK". If the DO bit is set (DO=1), then the client is DNSSEC-aware, and it is OK for the DNS server to return DNSSEC data in a response. If the DO bit is not set (DO=0), then the client is not DNSSEC-aware, and the DNS server must not include any DNSSEC data in a DNS response.	boolean
coredns.log.error.message	The error message	text
data_stream.dataset	Data stream dataset.	constant_keyword
data_stream.namespace	Data stream namespace.	constant_keyword
data_stream.type	Data stream type.	constant_keyword
event.dataset	Event dataset	constant_keyword
event.module	Event module	constant_keyword
host.containerized	If the host is a container.	boolean
host.os.build	OS build information.	keyword
host.os.codename	OS codename, if any.	keyword
input.type	Input type	keyword
kubernetes.container.name	Kubernetes container name	keyword
kubernetes.labels.*	Kubernetes labels map	object
kubernetes.namespace	Kubernetes namespace	keyword
kubernetes.node.name	Kubernetes node name	keyword
kubernetes.pod.name	Kubernetes pod name	keyword
kubernetes.pod.uid	Kubernetes pod UID	keyword
kubernetes.replicaset.name	Kubernetes replicaset name	keyword
log.file.device_id	ID of the device containing the filesystem where the file resides.	keyword
log.file.fingerprint	The sha256 fingerprint identity of the file when fingerprinting is enabled.	keyword
log.file.idxhi	The high-order part of a unique identifier that is associated with a file. (Windows-only)	keyword
log.file.idxlo	The low-order part of a unique identifier that is associated with a file. (Windows-only)	keyword
log.file.inode	Inode number of the log file.	keyword
log.file.vol	The serial number of the volume that contains a file. (Windows-only)	keyword
log.offset	Log offset	long

Example

An example event for log looks as following:

{
    "@timestamp": "2023-09-27T18:59:58.096Z",
    "agent": {
        "ephemeral_id": "bbb180b6-3756-4f5b-81d5-6e333e740796",
        "id": "86a82f91-ff66-4d28-ab7c-eb9350f317ed",
        "name": "docker-fleet-agent",
        "type": "filebeat",
        "version": "8.10.1"
    },
    "coredns": {
        "log": {
            "buffer_size": 1232,
            "dnssec_ok": false
        }
    },
    "data_stream": {
        "dataset": "coredns.log",
        "namespace": "ep",
        "type": "logs"
    },
    "destination": {
        "bytes": 65
    },
    "dns": {
        "header_flags": [
            "RD",
            "RA"
        ],
        "id": "58521",
        "question": {
            "class": "IN",
            "name": "google.com",
            "registered_domain": "google.com",
            "top_level_domain": "com",
            "type": "A"
        },
        "response_code": "NOERROR"
    },
    "ecs": {
        "version": "8.11.0"
    },
    "elastic_agent": {
        "id": "86a82f91-ff66-4d28-ab7c-eb9350f317ed",
        "snapshot": false,
        "version": "8.10.1"
    },
    "event": {
        "agent_id_status": "verified",
        "category": [
            "network"
        ],
        "created": "2023-09-27T18:59:58.096Z",
        "dataset": "coredns.log",
        "duration": 32133957.999999996,
        "ingested": "2023-09-27T18:59:59Z",
        "kind": "event",
        "original": "[INFO] 192.168.112.3:45632 - 58521 \"A IN google.com. udp 51 false 1232\" NOERROR qr,rd,ra 65 0.032133958s",
        "outcome": "success",
        "type": [
            "protocol"
        ]
    },
    "host": {
        "architecture": "aarch64",
        "containerized": false,
        "hostname": "docker-fleet-agent",
        "id": "ddbe644fa129402e9d5cf6452db1422d",
        "ip": [
            "172.31.0.7"
        ],
        "mac": [
            "02-42-AC-1F-00-07"
        ],
        "name": "docker-fleet-agent",
        "os": {
            "codename": "focal",
            "family": "debian",
            "kernel": "5.15.49-linuxkit",
            "name": "Ubuntu",
            "platform": "ubuntu",
            "type": "linux",
            "version": "20.04.6 LTS (Focal Fossa)"
        }
    },
    "input": {
        "type": "filestream"
    },
    "log": {
        "file": {
            "device_id": 141,
            "inode": 18614042,
            "path": "/tmp/service_logs/coredns.log"
        },
        "level": "info",
        "offset": 67
    },
    "network": {
        "bytes": 116,
        "iana_number": "17",
        "protocol": "dns",
        "transport": "udp"
    },
    "related": {
        "hosts": [
            "google.com"
        ],
        "ip": [
            "192.168.112.3"
        ]
    },
    "source": {
        "address": "192.168.112.3",
        "bytes": 51,
        "ip": "192.168.112.3",
        "port": 45632
    },
    "tags": [
        "preserve_original_event",
        "coredns-log"
    ]
}

Changelog

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Changelog

Version	Details	Kibana version(s)
0.9.0	Enhancement (View pull request) Allow @custom pipeline access to event.original without setting preserve_original_event.	—
0.8.0	Enhancement (View pull request) ECS version updated to 8.11.0. Update the kibana constraint to ^8.13.0. Modified the field definitions to remove ECS fields made redundant by the ecs@mappings component template.	—
0.7.0	Enhancement (View pull request) Add global filter on data_stream.dataset to improve performance.	—
0.6.1	Bug fix (View pull request) Add null and ignore_missing check to handle event.original field.	—
0.6.0	Enhancement (View pull request) Update the package format_version to 3.0.0.	—
0.5.0	Enhancement (View pull request) Adapt fields for changes in file system info	—
0.4.0	Enhancement (View pull request) Rename ownership from obs-service-integrations to obs-infraobs-integrations	—
0.3.0	Enhancement (View pull request) Migrate Overview dashboard visualizations to lens.	—
0.2.2	Bug fix (View pull request) Fix reference error in Overview dashboard.	—
0.2.1	Enhancement (View pull request) Added categories and/or subcategories.	—
0.2.0	Enhancement (View pull request) Update ECS version to 8.5.1	—
0.1.0	Enhancement (View pull request) Initial draft of the package	—

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