Iapetus

This project is unstable yet. So breaking change may be happened no notice.

Overview

Iapetus is a reverse proxy for Prometheus that dispatches queries to Prometheus nodes depending on the content of a query, such a label and a timestamp. Iapetus also supports relabeling feature, so you can configure relabeling rules for each node. To simplify, Iapetus does not query multiple nodes and aggregate that results. It only does dispatch.

Install

Binary

Go to https://github.com/kobtea/iapetus/releases

Building from source

$ go get -d github.com/kobtea/iapetus
$ cd $GOPATH/src/github.com/kobtea/iapetus
$ make build

Usage

$ iapetus --help
usage: iapetus --config=CONFIG [<flags>]

Flags:
  --help                         Show context-sensitive help (also try --help-long and --help-man).
  --config=CONFIG                iapetus config file path.
  --listen.addr=":19090"         address to listen.
  --listen.prefix=LISTEN.PREFIX  path prefix of this endpoint. remove this prefix when dispatch to a backend.
  --log.level=LOG.LEVEL          log level (debug, info, warn, error)
  --version                      Show application version.

configuration format is below.

# config.yml
log:
  # debug, info, warn, error. default is info.
  level: info
# Multi clusters are not support yet. So iapetus use 1st cluster setting.
clusters:
  - name: <string>
    # list prometheus as node
    nodes:
      - name: <string>
        url: <string>
        relabels:
          # support relabelling rules at prometheus
          [ - <relabel_config> ... ]
        min_step: <duration>
    # proxy rules
    # each rule are pair of `target: <node_name>` and some rule.
    # support rules are below.
    # - default: <bool>, use when no match other rules
    # - start: <op duration>, compare `start` at request parameter
    # - end: <op duration>, compare `end` at request parameter
    # - range: <op duration>, range is between `start` and `end` at request parameter
    # - required_labels: [ <label_name>: <label_value> ... ], find labels from `query` or `match[]` parameter(s). If a request satisfy this rule, Iapetus send not matched metrics but whole query send to the target. It is mean that Iapetus does not calculate values.
    rules:
      [ - <rules>, ...]

sample

log:
  level: info
clusters:
  - name: cluster1
    nodes:
      - name: primary
        url: http://localhost:9090
      - name: archive
        url: http://localhost:9091
        relabels:
          - source_labels: [__name__]
            target_label: __name__
            replacement: ${1}_avg
        min_step: 10m
    rules:
      - target: primary
        default: true
      - target: archive
        range: "> 1d"
      - target: archive
        start: "< now-1d"

Roadmap

Cluster

Handling multi prometheus clusters. Proxy rule is TBD. It may be a same rule as node, (or not).

License

MIT