Nomad Logger

This is a simple Go application that polls the Nomad API for all allocations on a certain host, and then updates a promtail file_sd_config file, so promtail can scrape and ship logs.

Usage

Usage: nomad-logger [--nomad-address NOMAD-ADDRESS] [--nomad-allocs-dir NOMAD-ALLOCS-DIR] [--nomad-node-id NOMAD-NODE-ID] [--promtail-targets-file PROMTAIL-TARGETS-FILE]

Options:
  --nomad-address NOMAD-ADDRESS
                         The address of the Nomad API [default: http://localhost:4646, env: NOMAD_ADDRESS]
  --nomad-allocs-dir NOMAD-ALLOCS-DIR
                         The location of the Nomad allocations data. Used to set the path to the logfiles [default: /var/lib/nomad/alloc, env: NOMAD_ALLOCS_DIR]
  --nomad-node-id NOMAD-NODE-ID
                         The ID of the Nomad node to collect logs for. If empty, we'll suppose this also runs in as a nomad job, and the available env vars will be used to determine the Node ID [env: NOMAD_NODE_ID]
  --promtail-targets-file PROMTAIL-TARGETS-FILE
                         The promtail file_sd_config file where the generated config can be written. Will be completely overwritten, so don't put anything else there. [default: /etc/promtail/nomad.yaml, env: PROMTAIL_TARGETS_FILE]
  --help, -h             display this help and exit

Example

There is an example nomad job file in examples/nomad-job.hcl. If this is the only job you are running on that node, than the resulting promtail file_sd_config file will look something like examples/promtail-nomad.yaml.

Installing/Building

You can just go install github.com/dmaes/nomad-logger@latest or git clone and go build this.