Logging InfluxDB Exporter

This Caddy Module allows to write your logs directly into a InfluxDB.

You can use placeholders like {request_host} in the tag value. Note these placeholders are not the default caddy placeholders like in the http module. Rather they reference values from the log.

Install

First, the xcaddy command:

$ go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest

Then build Caddy with this Go module plugged in. For example:

$ xcaddy build --with github.com/ishanjain28/influx_log

Usage

Make sure you set the encoder as json. You can use this plugin with either a caddy.json or a Caddyfile here is an example for both:

Caddyfile

127.0.0.1 {
    root * example
    file_server
    log {
        format json
        output influx_log {
            token <token>
            org my-org
            bucket my-bucket
            measurement l1
            tags {
                hostname {request_host}
            }
            host http://localhost:8086
            ignore_fields logger msg
        }
    }
}

caddy.json

{
    "logging": {
        "logs": {
            "default": {
                "exclude": [
                    "http.log.access"
                ]
            },
            "log0": {
                "encoder": {
                    "format": "json"
                },
                "writer": {
                    "bucket": "my-bucket",
                    "host": "http://127.0.0.1:8086",
                    "measurement": "l1",
                    "org": "my-org",
                    "output": "influx_log",
                    "tags": {
                        "hostname": "{request_host}"
                    },
                    "token": "<token>",
                    "ignore_fields": ["logger", "msg"]
                },
                "include": [
                    "http.log.access"
                ]
            }
        }
    },
    "apps": {
        "http": {
            "servers": {
                "srv0": {
                    "listen": [
                        ":443"
                    ],
                    "routes": [
                        {
                            "match": [
                                {
                                    "host": [
                                        "127.0.0.1"
                                    ]
                                }
                            ],
                            "handle": [
                                {
                                    "handler": "file_server",
                                    "root": "example"
                                }
                            ]
                        }
                    ],
                    "logs": {}
                }
            }
        }
    }
}